Features
■ Thick fi lm technology
■ Power rating of 2 watts at 70 °C
■ RoHS compliant*
Applications
■ Power supplies
■ Stepper motor drives
CRM2512 - Pulse Resistant Power Resistor
*RoHS Directive 2002/95/EC Jan 27, 2003 including Annex.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications
General Information
The Bourns® CRM2512 Series is a thick-
fi lm power resistor with a rating of 2
watts in a standard 2512 chip format.
This product has a very wide resistance
range making it suitable for different
applications in power supply circuits
including current sensing and inrush
current limiting.
*RoHS COMPLIANT
DIMENSIONS: MM
(INCHES)
Electrical Characteristics
Power Rating @ 70 °C 2 W
Operating Temperature Range -55 °C to +155 °C
Derated to Zero Load at +155 °C
Maximum Working Voltage
0.047 to 0.91 ohms 3017 mV
1.0 ohm to 1.0 megohm 600 V
Insulation Resistance > 1000 megohms
Resistance Range 0.047 - 0.91 ohm (E24 Values)
1.0 - 9.1 ohms (E24 Values)
10.0 ohms - 1 megohm (E24 + E96 Values)
Resistance Tolerance ±1 %, ±5 %
Temperature Coeffi cient
0.047 to 0.091 ohms ±150 PPM/°C
0.100 to 0.91 ohms ±100 PPM/°C
1.0 ohm to 1 megohm ±200 PPM/°C
10 ohms to 1 megohm ±100 PPM/°C
Product Dimensions
Derating Curve
Characteristic Data
Test ΔR Max.
Load Life (1000 hours)
1 % Tolerance < 1 %
5 % Tolerance < 3 %
Short Term Overload
1 % Tolerance < 1 %
5 % Tolerance < 2 %
Thermal Shock
1 % Tolerance < 0.5 %
5 % Tolerance < 1 %
6.3 ± 0.20
(0.248 ± 0.008)
TOP SIDE 3.1 ± 0.20
(0.122 ± 0.008)
0.6 ± 0.20
(0.024 ± 0.008) 0.6 ± 0.20
(0.024 ± 0.008)
1.8 ± 0.20
(0.070 ± 0.008)
Ambient Temperature (°C)
70 155
100
-55
Power Ratio (%)
Recommended Solder Pad Layout
A
B
SENSING TRACE
Cu TRACE
L
Model A B L
CRM2512 3.7 2.45 2.7
(0.146) (0.096) (0.106)
Soldering Profi le
50
100
150
200
250
Temperature (°C)
90 ± 30 seconds
Pre-heating Zone
150 °C
230 °C or higher
Peak 260 +5/-0 °C
180 °C
30 ± 10 seconds
Heating Time
Soldering Zone
For Standard Values Used in Capacitors, Inductors, and Resistors, click here.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications
CRM2512 - Pulse Resistant Power Resistor
Pulse Load Characteristics (R > 1 Ohm)
How to Order
CRM 2512 - F X - R100 E LF
Model
(CRM = Precision Chip Resistor)
Size
2512 = 2512 Size
Resistance Tolerance
• F = ±1 %
• J = ±5 %
TCR (PPM/°C)
• W = ±200 PPM/°C
• Z = ±150 PPM/°C
• X = ±100 PPM/°C
Resistance Value
R <1 ohm (1 % or 5 % Tolerance: “R” (decimal point) followed by three signifi cant digits (example: R100 = 0.100 ohm
1% Tolerance:
<100 ohms ....... “R” represents decimal point (example: 24R3 = 24.3 ohms)
≥100 ohms ......First three digits are signifi cant, fourth digit represents number of zeros to follow
(example: 8252 = 82.5K ohms)
5% Tolerance:
<10 ohms ......... “R” represents decimal point (example: 4R7 = 4.7 ohms)
≥10 ohms ........First two digits are signifi cant, third digit represents number of zeros to follow
(example: 474 = 470K ohms)
Packaging
• E = 4000 pieces on 180 mm (7 inch) reel
Termination
• LF = Tin-plated (RoHS Compliant)
1000
100
10
1
0.0001 0.001
SURGE DURATION (S)
PEAK POWER (W)
0.01 1.0
REV. 05/11
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications
CRM2512 - Pulse Resistant Power Resistor
Packaging Dimensions (Conforms to EIA RS-481A)
3.60 ± 0.20
(0.142 ± 0.008) 2.0 ± 0.05
(0.079 ± 0.002)
4.0 ± 0.05
(0.157 ± 0.002)
4.0 ± 0.1
(0.157 ± 0.004)
1.5 +0.1/-0
(0.059 +0.004/-0) DIA. 1.5
(0.059)
DIA. MIN.
0.85 ± 0.15
(0.033 ± 0.006)
6.9 ± 0.2
(0.272 ± 0.008)
5.5 ± 0.05
(0.217 ± 0.002)
1.75 ± 0.1
(0.069 ± 0.004)
12.0 ± 0.2
(0.472 ± 0.008)
TOP TAPE
PAPER TAPE
RESISTOR
USER DIRECTION OF FEED
60.0
(2.362)
MIN.
DIA.
DIA.
180 +0/-3
(7.09 +0/-0.118)
13.0 ± 1.0
(0.512 ± 0.039)
DIA.
15.4 ± 2.0
(0.606 ± 0.079)
13.0 ± 1.0
(0.512 ± 0.039)
DIMENSIONS: MM
(INCHES)
