Features n Low peak clamping voltage even during severe current surges n Ability to repeatedly protect against high surge currents up to rated limits n Convenient mounting and grounding to any flat surface or to DIN-1 (TS-32) or DIN-3 (TS-35) rail n Cable shields are passed through and may be either grounded or arc-protected to ground n Vibration-resistant screw-type clamp terminals n Flame-resistant epoxy-filled housing 1840 Series - Signal and Dataline Protector The Bourns(R) 1840 Series Signal and Dataline Protectors are designed to protect sensitive electronic circuits and components from damaging surge voltages and currents. Their extremely fast response and low clamping voltages make them particularly suitable for the protection of sensitive signal and datalines associated with computer, data communication, instrumentation, broadcasting and industrial controls. They may be used directly with EIA standard interfaces RS-232, RS-422, RS-423, RS-485 and with 4-20 mA and 50 mA instrumentation loops. The Model 1840 Series Signal and Dataline Protectors are fast, rugged and capable of protecting against fast rising voltage transients as well as the severe current surges associated with lightning discharges, in each case up to rated limits. Method of Operation The Bourns(R) 1840 Series are heavy-duty, multi-staged protectors. A solid-state 3rd stage protection component intercepts the leading edge of the surge within sub-nanosecond response time. Within microseconds, a primary stage 3-electrode common chambered heavy-duty gas discharge tube capable of handling 20,000 ampere lightning currents operates and crowbars the majority of the surge energy to ground. The Model 1840 also utilizes Bourns' TBU(R) High-Speed Protector (HSP) technology as a key 2nd stage. Any current through the protector exceeding 300 mA will cause the TBU(R) HSP to quickly transition into a high impedance state, thus isolating any harmful voltage and/or current from damaging the protected equipment. The gas discharge tube protector remains in the crowbar state until the surge has passed and line voltages return to safe levels. The TBU(R) HSP then automatically restores the line to normal operation by resetting to a low impedance state. There is no need for resetting a breaker or replacing a fuse to address a transient surge event. Application Protectors are generally placed at each end of a signal, dataline or current loop. In the case of daisy-chain configurations (such as RS-485), protectors are placed at each node. Related Bourns(R) Protectors For outdoor applications with 1/2-inch NPT ports (such as field-mounted 4-20 mA transmitters), please refer to the Bourns(R) Model 1669 Series Protector. In this application, the mixed use of a Model 1840 Series Protector at the controller and a Model 1669 Series Protector at the field is recommended. Characteristics @ 25 C 1840-05 1840-12 1840-24 (1) Maximum Operating Voltage 6 Vdc 13 Vdc 26 Vdc Maximum Breakdown Voltage (L-L) and (L-G) 8 Vdc 15 Vdc 30 Vdc Standard Model (1) Systems operating at 18 V or above and experiencing current above 500 mA (including short-term inrush current at start-up) may latch the overcurrent protection feature in blocking mode. This will prevent system operation until the power is removed. Surge Life 100 Amps 10 x 1000 sec.........................................................................................................300 operations min. 100 Amps 10 x 1000 sec.........................................................................................................300 operations min. 500 Amps 10 x 1000 sec.........................................................................................................50 operations min. 1000 Amps 10 x 1000 sec.......................................................................................................10 operations min. 3 kA, 6 kV / 8 x 20 sec Combination Wave.............................................................................100 operations min. 10 kA / 8 x 20 sec....................................................................................................................10 operations min. 20 kA / 8 x 20 sec....................................................................................................................5 operations min. Breakdown Voltage.................................................................................................................................See table* ESD @ 8 kV............................................................................................................................................10 operations min. Shield ARC Protection 6 kV / 3 kA...........................................................................................................5 operations min. Capacitance @ 1 MHz............................................................................................................................L/G: 45 pF, L/L: 35 pF Series Resistance...................................................................................................................................12 typical Maximum Load Continuous Current........................................................................................................220 mA DC Leakage Current at Rated L/G Voltage.............................................................................................< 10 A Blocking Current......................................................................................................................................300 mA; typical 450 mA Signal/Data Attenuation...........................................................................................................................3 db @ 30 MHz with 50 termination Operating Temperature............................................................................................................................-40 C to +60 C Response Time.......................................................................................................................................< 1 sec Wire Size.................................................................................................................................................20 AWG * Custom voltages are available upon request. Please visit www.bourns.com/docs/Product-Datasheets/SMBJ.pdf for custom allowable voltages. Lead-time may be extended for some custom voltages. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. BALANCED OR DIFFERENTIAL INTERFACE, SUCH AS RS-422 P/N 1840 E3 P/N 1840 L2 L3 L3 GND E1 File No. 1800SERS2 L2 L1 E2 E3 GND L1 ~ ~ E2 XMTR BLDG. 2 ~ ~ BLDG. 1 RCVR E1 1840 Series - Signal and Dataline Protector EQPT. COMMON AND/OR GND. Typical Connections How To Order UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 Unbalanced Interface, Two Individual Circuits, Such as RS-232 Model No. Designator TBU L1 XMTR E3 L1 E3 RCVR E1 CONTROL ROOM BALANCED OR DIFFERENTIAL INTERFACE, SUCH AS RS-422 Balanced or Differential Interface, Such as RS-422 ~ ~ E3 L3 COMMON GND. L1 GND E1 EQPT. COMMON AND/OR GND. E3/L3 83.31 COMMON (3.28) GND. COMMON GND. EQPT. COMMON AND/OR GND. E3 GND L1 P/N 1840 E1 L2 E2 BOURNS E3 L3 PROTECTOR GROUNDING P/NL11669GNDLINK E1 L3 48.51 (1.91) RCVR 18.80RCVR (0.74) 3.18 (0.125) 2.36 (0.093) ALIGNMENT PIN XMTR EQPT. COMMON AND/OR GND. COMMON GND. COMMON GND. FEED-THRU(E3/L3) GROUNDING SCREW - L3 L2L1 XMTR + ~ ~~ ~ File No. 1800SERS3 RCVR E3 GND E2E1P/N 1840 ~ ~ ~~ DIN-1 RAIL (TS-32/EN50035) EQPT. COMMON AND/OR GND. UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 Current Loop, 4-20 mA CURRENT LOOP, 4-20 mA CONTROL ROOM BLDG. 1 XMTR E3 E3 L3 L3 GND E1 GND E1 L1 L1 I RECEIVER 1-5 VOLTS File No.EQPT. COMMON 1800SERS3 AND/OR GND. GROUNDING SCREW RED /WHITE RED L2 P/N 1840 E2 BLACK /WHITE BOURNS L3 1669 L1 BLK GND BOURNS PROTECTOR COMMON P/N 1669 GND. COMMON COMMON GND. GND. E3 E1 GREEN MOUNTING/GROUNDING SCREW RCVR XMTR 28.96 (1.14) 45.47 (1.79) EQPT. COMMON 49.02 AND/OR GND. (1.93) DIN-3 RAIL (TS-35/EN50022) DIN-1 RAIL (TS-32/EN50035) CURRENT LOOP, 4-20 mA CONTROL ROOM ~ ~ Grounding: The 8-32 mounting screw and attached clamp, and hence the DIN-1 (TS-32) or DIN-3 (TS-35) rail, serve as the protector ground. The rail (or 8-32 mounting screw if the XMTR I clamp is not used) should beE2connected to the facility ground via an AWG #6 or larger copper P/N 1840 RED L2 /WHITE RED wire. ThisPOWER wire should Single point grounding will provide 250 be as short and straight as possible. BLACK /WHITE BOURNS E3 L3 SUPPLY OHMS 1669 better protection and will permitGND the protector to be located a distance from GREEN the equipment. L1 ~ ~ I File No. 1800SERS3 L1 COMMON GND. BOURNS PROTECTOR P/N 1669 MM (INCHES) Circuit Diagram BLK - RECEIVER 1-5 VOLTS DIMENSIONS: TBU(R) DEVICE E1 + E1 49.02 (1.93) + L2 L2 - 250 OHMS P/N1840 1840 E2 P/N E2 ~ ~ ~ FEED-THRU(E3/L3) I 28.96 9.53 (1.14) (0.375) Add -A3 to base model number for DIN-3 clamp. (Example: 1840-12-A3) BLDG. 2 ~~ ~~ XMTR POWER SUPPLY RCVR 8-32UNF-2A 17.80 (0.70) LG LINE File No. 1800SERS2 I RECEIVER 1-5 VOLTS ~ ~ XMTR XMTR SHIELD (0.74) Add -A1 to base model number for DIN-1 clamp. (Example: 1840-12-A1) LINE L1 L3 L2 EQPT E2 E3 E1 POWER SUPPLY E3 18.80 How To Order (Clamp) EQPT. COMMON AND/OR GND. I UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 BLDG. BLDG. 2 GND RED E2 P/N 11840 L2 RED /WHITE 250 BLACK /WHITE BOURNS E3 L3 OHMS 1669 GREEN GND 1840 2 BLDG. BLDG. L2 P/N E2 E2 L2L1 E1P/N11840 BLK E2 83.31 (3.28) EQPT. COMMON AND/OR GND. COMMON COMMON GND. CURRENT LOOP, 4-20 mA GND. E1 LINE L1 L3 L2 (R) XMTR COMMON GND. COMMON GND. EQPT. COMMON AND/OR GND. RCVR E2 E1 GND LINE E3 L3 L1 EQPT. COMMON AND/OR GND. E2 L3 L2 L1 L3 GND E1 File No. 1800SERS2 L2 L1 BLDG. 2 L2 P/N 1840 P/N 1840 GND ~ ~ E2 E1 RCVR P/NGND 1840 ~ ~ L3 ~~ ~~ L2 E3 EQPT E2 E3 E1 BLDG. 1 E2 P/N 1840 DEVICE GND Voltage SOLID-STATE 05 = 5 Vdc LOW 12 = 12 Vdc VOLTAGE PROTECTION 24 = 24 Vdc TBU DEVICE L2 48.51 Clamp (1.91) SHIELD A1 = DIN-1 SHORTING E3/L3 GROUNDING LINK A3 = DIN-3 LINK BALANCED BLDG.OR 1 DIFFERENTIAL INTERFACE, SUCH AS RS-422 BLDG. 2 XMTR 1840 - nn - An (R) EQUIPMENT COMMON GND. COMMON GND. L2 TBU(R) DEVICE SOLID-STATE LOW VOLTAGE PROTECTION E2 E3 SHIELD EQUIPMENT EQPT. COMMON AND/OR GND. SHIELD SHORTING LINK Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. LINE 1 L3 L2 EQPT E2 E3 E1 GND SOLID-STATE LOW VOLTAGE PROTECTION(R) TBU DEVICE E2 E3 SHIELD SHIELD E1 SOLID-STATE LOW VOLTAGE PROTECTION SHIELD SHORTING LINK SHORTING LINK E2 E3 EQUIPMENT LINE LINE TBU(R) DEVICE L2 L2 EQUIPMENT TBU(R) DEVICE E1 TBU(R) DEVICE L1 L1 SHIELD 1840 Series - Signal and Dataline Protector Product Dimensions LINE L1 L3 L2 EQPT E2 E3 E1 EQPT E2 E3 E1 LINE L1 L3 L2 GND GND 48.51 (1.91) 48.51 (1.91) 18.80 (0.74) E3/L3 GROUNDING LINK E3/L3 GROUNDING LINK 83.31 (3.28) 18.80 (0.74) 83.31 (3.28) DIMENSIONS: 3.18 (0.125) 2.36 (0.093) ALIGNMENT PIN MM (INCHES) 3.18 (0.125) 2.36 (0.093) PIN ALIGNMENT 8-32UNF-2A 17.80 (0.70) LG 9.53 (0.375) 8-32UNF-2A 17.80 (0.70) LG 9.53 (0.375) FEED-THRU(E3/L3) FEED-THRU(E3/L3) GROUNDING SCREW GROUNDING SCREW MOUNTING/GROUNDING SCREW MOUNTING/GROUNDING SCREW 28.96 (1.14) 28.96 (1.14) 49.02 (1.93) DIN-1 RAIL (TS-32/EN50035) DIN-1 RAIL (TS-32/EN50035) 49.02 (1.93) 45.47 (1.79) 45.47 (1.79) DIN-3 RAIL (TS-35/EN50022) DIN-3 RAIL (TS-35/EN50022) Asia-Pacific: Tel: +886-2 2562-4117 * Email: asiacus@bourns.com EMEA: Tel: +36 88 520 390 * Email: eurocus@bourns.com The Americas: Tel: +1-951 781-5500 * Email: americus@bourns.com www.bourns.com REV. C 07/18 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. Legal Disclaimer Notice This legal disclaimer applies to purchasers and users of Bourns(R) products manufactured by or on behalf of Bourns, Inc. and its affiliates (collectively, "Bourns"). Unless otherwise expressly indicated in writing, Bourns(R) products and data sheets relating thereto are subject to change without notice. Users should check for and obtain the latest relevant information and verify that such information is current and complete before placing orders for Bourns(R) products. The characteristics and parameters of a Bourns(R) product set forth in its data sheet are based on laboratory conditions, and statements regarding the suitability of products for certain types of applications are based on Bourns' knowledge of typical requirements in generic applications. The characteristics and parameters of a Bourns(R) product in a user application may vary from the data sheet characteristics and parameters due to (i) the combination of the Bourns(R) product with other components in the user's application, or (ii) the environment of the user application itself. The characteristics and parameters of a Bourns(R) product also can and do vary in different applications and actual performance may vary over time. Users should always verify the actual performance of the Bourns(R) product in their specific devices and applications, and make their own independent judgments regarding the amount of additional test margin to design into their device or application to compensate for differences between laboratory and real world conditions. Unless Bourns has explicitly designated an individual Bourns(R) product as meeting the requirements of a particular industry standard (e.g., ISO/TS 16949) or a particular qualification (e.g., UL listed or recognized), Bourns is not responsible for any failure of an individual Bourns(R) product to meet the requirements of such industry standard or particular qualification. Users of Bourns(R) products are responsible for ensuring compliance with safety-related requirements and standards applicable to their devices or applications. Bourns(R) products are not recommended, authorized or intended for use in nuclear, lifesaving, life-critical or life-sustaining applications, nor in any other applications where failure or malfunction may result in personal injury, death, or severe property or environmental damage. Unless expressly and specifically approved in writing by two authorized Bourns representatives on a case-by-case basis, use of any Bourns(R) products in such unauthorized applications might not be safe and thus is at the user's sole risk. Life-critical applications include devices identified by the U.S. Food and Drug Administration as Class III devices and generally equivalent classifications outside of the United States. Bourns expressly identifies those Bourns(R) standard products that are suitable for use in automotive applications on such products' data sheets in the section entitled "Applications." Unless expressly and specifically approved in writing by two authorized Bourns representatives on a case-by-case basis, use of any other Bourns(R) standard products in an automotive application might not be safe and thus is not recommended, authorized or intended and is at the user's sole risk. If Bourns expressly identifies a sub-category of automotive application in the data sheet for its standard products (such as infotainment or lighting), such identification means that Bourns has reviewed its standard product and has determined that if such Bourns(R) standard product is considered for potential use in automotive applications, it should only be used in such sub-category of automotive applications. Any reference to Bourns(R) standard product in the data sheet as compliant with the AEC-Q standard or "automotive grade" does not by itself mean that Bourns has approved such product for use in an automotive application. 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Bourns(R) products may not, without prior authorization from Bourns and/or the U.S. Government, be resold, transferred, or re-exported to any party not eligible to receive U.S. commodities, software, and technical data. To the maximum extent permitted by applicable law, Bourns disclaims (i) any and all liability for special, punitive, consequential, incidental or indirect damages or lost revenues or lost profits, and (ii) any and all implied warranties, including implied warranties of fitness for particular purpose, non-infringement and merchantability. For your convenience, copies of this Legal Disclaimer Notice with German, Spanish, Japanese, Traditional Chinese and Simplified Chinese bilingual versions are available at: Web Page: http://www.bourns.com/legal/disclaimers-terms-and-policies PDF: http://www.bourns.com/docs/Legal/disclaimer.pdf C1753 05/17/18