January 2019
Multilayer Balun
For 758-821MHz
HHM1944A1
1.0x0.5mm [EIA 0402]*
* Dimensions Code JIS[EIA]
RF Components
Caution
Theproductsinthiscatalogwillbeorhavebeen
stoppedproduction
DiscontinueIssueDate Jun. 4, 2020
LastPurchaseOrderDate Dec. 31, 2021
LastShipmentDate Mar. 31, 2022
PleaserefertoourWebsiteaboutreplacementinformation.
RF Components
• All specifications are subject to change without notice.
• Before using these products, be sure to request the delivery specifications.
20190114 / rf_balun_hhm1944a1_en.fm
Multilayer Balun
For 758-821MHz
SHAPES AND DIMENSIONS
RECOMMENDED LAND PATTERN
HHM1944A1
Conformity to RoHS Directive
Dimensions in mm
1 Balanced port
2 Unbalanced port
3 Balanced port
4 GND
Terminal functions
(1)
(2)
(3)
(4)
[Top view]
[Bottom view]
Marking
0.12±0.07
0.35±0.10
0.30±0.10
0.50max.1.00±0.05
0.30±0.10
0.50±0.05
0.12±0.07
Dimensions in mm
0.05
0.30
0.30 0.20
0.70 0.45
0.45 0.20
RoHS Directive Compliant Product: See the following for more details.https://product.tdk.com/info/en/environment/rohs/index.html
Theproductswillbeorhavebeen
stoppedproduction
RF Components
• All specifications are subject to change without notice.
• Before using these products, be sure to request the delivery specifications.
20190114 / rf_balun_hhm1944a1_en.fm
HHM1944A1
ELECTRICAL CHARACTERISTICS
TEMPERATURE RANGE
Item Frequency Range
(MHz) Min. Typ. Max.
Unbalanced Port Characteristic Impedance () 50 (Nominal)
Balanced Port Characteristic Impedance ()100 (Nominal)
Return Loss at Unbalanced Port (dB) 758 to 821 20 27.2 —
Phase Balance (deg.) 758 to 821 168 181 192
Amplitude Balance (dB) 758 to 821 –2.0 0.59 2.0
Insertion Loss (dB) 758 to 821 —0.48 0.80
758 to 821 — — 0.85 (–40 to +85°C)
Power Handling (W) — — 1
Operating temperature Storage temperature
（°C） （°C）
–40 to +85 –40 to +85
Theproductswillbeorhavebeen
stoppedproduction
RF Components
• All specifications are subject to change without notice.
• Before using these products, be sure to request the delivery specifications.
20190114 / rf_balun_hhm1944a1_en.fm
HHM1944A1
FREQUENCY CHARACTERISTICS
INSERTION LOSS AMPLITUDE BALANCE
RETURN LOSS PHASE BALANCE
3.0
0.5
1.0
2.0
2.5
1.5
0.0
Insertion Loss(dB)
950
Frequency(MHz)
650 700 800 900750 850
–4
–2
4
2
0
Amplitude Balance(dB)
950
Frequency(MHz)
650 700 800 900750 850
50
40
30
10
20
0
Return Loss(dB)
950
Frequency(MHz)
650 700 800 900750 850
160
190
180
165
175
185
195
170
200
Phase Balance(deg)
950
Frequency(MHz)
650 700 800 900750 850
Theproductswillbeorhavebeen
stoppedproduction
RF Components
• All specifications are subject to change without notice.
• Before using these products, be sure to request the delivery specifications.
20190114 / rf_balun_hhm1944a1_en.fm
HHM1944A1
RECOMMENDED REFLOW PROFILE
t3 : Time within 5°C of actual peak temperature
The maximum number of reflow is 3.
Preheating Soldering
Critical zone (T3 to T4) Peak
Temp. Time Temp. Time Temp. Time
T1 T2 t1 T3 t2 T4 t3
150°C 200°C 60 to 120sec 217°C 60 to 120sec 240 to 260°C 30sec max.
t3
t1
Preheating
t2
Soldering
T3 T3
T4
T2
T1
t:
Time
T:
Temperature
Peak
6°C/sec
or lower
3°C/sec
or lower
Theproductswillbeorhavebeen
stoppedproduction
RF Components
• All specifications are subject to change without notice.
• Before using these products, be sure to request the delivery specifications.
20190114 / rf_balun_hhm1944a1_en.fm
REMINDERS FOR USING THESE PRODUCTS
Before using these products, be sure to request the delivery specifications.
SAFETY REMINDERS
Please pay sufficient attention to the warnings for safe designing when using these products.
The products listed on this catalog are intended for use in general electronic equipment (AV equipment, telecommunications equipment,
home appliances, amusement equipment, computer equipment, personal equipment, office equipment, measurement equipment,
industrial robots) under a normal operation and use condition.
The products are not designed or warranted to meet the requirements of the applications listed below, whose performance and/or quality
require a more stringent level of safety or reliability, or whose failure, malfunction or trouble could cause serious damage to society, person
or property.
Please understand that we are not responsible for any damage or liability caused by use of the products in any of the applications below
or for any other use exceeding the range or conditions set forth in this catalog.
(1) Aerospace/Aviation equipment
(2) Transportation equipment (cars, electric trains, ships, etc.)
(3) Medical equipment
(4) Power-generation control equipment
(5) Atomic energy-related equipment
(6) Seabed equipment
(7) Transportation control equipment
(8) Public information-processing equipment
(9) Military equipment
(10) Electric heating apparatus, burning equipment
(11) Disaster prevention/crime prevention equipment
(12) Safety equipment
(13) Other applications that are not considered general-purpose
applications
When using this product in general-purpose applications, you are kindly requested to take into consideration securing protection circuit/
equipment or providing backup circuits, etc., to ensure higher safety.
Theproductswillbeorhavebeen
stoppedproduction