R1275 Buck Converter overview
Description
R1275 is a 36.00 V sync Buck Converter from with 2.00 A output current. The maximum 36.00 V input voltage can be regulated down into a 3.30 V to 5.00 V output voltage.
It requires are a typical inductor size of 2.20 µH, a typical external component count of 19 and achieves a peak efficiency of 91 %. Further R1275 characteristics are a adjustable 2000 kHz switching frequency and 1 available package option(s): HSOP-18 .
Parameter overview and features with replacement search
For the R1275 replacement search, please select a main parameter tolerance value and adjust the checkboxes for feature match. The product counter within the button shows the number of available equivalents and a click on the replacement button shows all possible replacements within a parametric overview.
Parameter | Value | Replacement Search Filter |
V-IN min. | 4.50 V | |
V-IN max. | 36.00 V | |
I-OUT? | 2.00 A | |
V-OUT min. | 3.30 V | |
V-OUT max. | 5.00 V | |
V-OUT | adjustable V | |
V-OUT programmable | ![]() |
|
sync/non-sync | sync | |
Frequency typ. | 2000 kHz | |
Frequency | adjustable | |
Frequency selectable | ||
ext.clock sync. | ![]() |
|
Frequency adj./ ext.clock min. | 1800 kHz | |
Frequency adj./ ext.clock max | 2200 kHz | |
Softstart | ![]() |
|
Softstart adjustable | ![]() |
|
Tracking | ![]() |
|
PG/Power OK | ![]() |
|
Quiescent current max. | 1350 µA | |
Operating min. | -40 °C | |
Operating max. | 105 °C | |
Junction min. | -40 °C | |
Junction max. | 125 °C | |
thermal shutdown typ. | 160 °C | |
Inductor size typ. | 2.20 µH | |
Inductor suggested by Würth Elektronik | ||
Automotive AEC-Q100 | ![]() |
|
Light-Load-Mode | ![]() |
|
Topology | Buck | |
Peak Efficiency | 91 % | |
Component count min. | 19 | |
current limit adjustable | ![]() |
|
Nr.of packages | 1 | |
CSP | ||
SC70 | ||
SOT | ||
MSOP | ||
QFN/DFN | ||
SO/SOIC | ||
SOP | HSOP-18 | |
DIP | ||
TO | ||
DDPAK |
R1275 Datasheet
Link to the most up-to-date R1275 datasheet and the product page for EVM, tools and support information.
R1275 Sample stock and distributor price breaks
R1275 prices and online available distributors.


Available Distributors with stock: 2
Digi-Key (10)
Product | Stock | Price | Buy | ||||||||||||||||
51338-0974 | 1250 |
| Buy Now | ||||||||||||||||
51338-0974 | 2801 |
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51338-0974 | 2801 |
| Buy Now | ||||||||||||||||
RP17A-13RA-12SD(71) | 191 |
| Buy Now | ||||||||||||||||
FB-300-UC25-H | 996 |
| Buy Now | ||||||||||||||||
FTS-111-02-L-D | 79 |
| Buy Now | ||||||||||||||||
5024262010 | 0 |
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5024262010 | 265 |
| Buy Now | ||||||||||||||||
5024262010 | 265 |
| Buy Now | ||||||||||||||||
GTCR36-351M-R10 | 700 |
| Buy Now | ||||||||||||||||
MS27466T15F97P-LC | 9 |
| Buy Now | ||||||||||||||||
4116R-1-275 | 0 |
| Buy Now | ||||||||||||||||
4116R-1-275LF | 0 |
| Buy Now | ||||||||||||||||
FP1206R1-R25-R | 0 |
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FTR-127-51-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-52-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-53-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-54-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-55-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-56-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-57-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-51-L-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-51-T-D | 0 |
| Buy Now | ||||||||||||||||
FTR-127-52-L-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-52-T-D | 0 |
| Buy Now |
Penn Elcom (21)
Product | Stock | Price | Buy |
R1275/05UK | 25 | Buy Now | |
R1275/1UAK | 25 | Buy Now | |
R1275-1UAKLAZ | 25 | Buy Now | |
R1275/1UAS | 25 | Buy Now | |
R1275-1UASLAZ | 25 | Buy Now | |
R1275/1UK | 25 | Buy Now | |
R1275/2UAK | 25 | Buy Now | |
R1275-2UAKLAZ | 25 | Buy Now | |
R1275-2UASLAZ | 25 | Buy Now | |
R1275/2UK | 25 | Buy Now | |
R1275/2US | 25 | Buy Now | |
R1275/2UVK | 25 | Buy Now | |
R1275/3UAK | 25 | Buy Now | |
R1275-3UAKLAZ | 25 | Buy Now | |
R1275-3UASLAZ | 25 | Buy Now | |
R1275/3UK | 25 | Buy Now | |
R1275/4UAK | 25 | Buy Now | |
R1275-4UAKLAZ | 25 | Buy Now | |
R1275-4UASLAZ | 25 | Buy Now | |
R1275/4UK | 25 | Buy Now | |
R1275/5UK | 25 | Buy Now |
Available Distributors without stock: 2
Allied Electronics, Inc (0)
TTI (0)
Available Distributors with stock: 7
Digi-Key
Product | Stock | Price | Buy | ||||||||||||||||
51338-0974 | 2801 |
| Buy Now | ||||||||||||||||
51338-0974 | 2801 |
| Buy Now | ||||||||||||||||
51338-0974 | 1250 |
| Buy Now | ||||||||||||||||
FB-300-UC25-H | 996 |
| Buy Now | ||||||||||||||||
GTCR36-351M-R10 | 700 |
| Buy Now | ||||||||||||||||
5024262010 | 265 |
| Buy Now | ||||||||||||||||
5024262010 | 265 |
| Buy Now | ||||||||||||||||
RP17A-13RA-12SD(71) | 191 |
| Buy Now | ||||||||||||||||
FTS-111-02-L-D | 79 |
| Buy Now | ||||||||||||||||
5024262010 | 0 |
| Buy Now | ||||||||||||||||
4116R-1-275 | 0 |
| Buy Now | ||||||||||||||||
4116R-1-275LF | 0 |
| Buy Now | ||||||||||||||||
FP1206R1-R25-R | 0 |
| Buy Now | ||||||||||||||||
FTR-127-51-T-S | 0 |
| Buy Now | ||||||||||||||||
FTR-127-52-T-S | 0 |
| Buy Now |
Newark element14
Product | Stock | Price | Buy | ||||||||||
HFX36R12-75 | 35 |
| Buy Now |
Bisco Industries
basicEparts
element14 Asia-Pacific
Farnell element14
Chip One Exchange
Available Distributors without stock: 4
Avnet
Allied Electronics
Mouser Electronics
TTI
List of equivalents and alternatives
The following DC/DC Buck Converter are similar to R1275. Optional, compare R1275 side-by-side with other Buck Converter via the Comparison function.
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of R1275.
Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
74404042015 | 1.5 | 3.0 | 4.3 | 31.00 | 4 x 4 x 1.8 | |
74404042022 | 2.2 | 2.2 | 3.4 | 42.00 | 4 x 4 x 1.8 | |
74404052022 | 2.2 | 3.0 | 3.6 | 31.60 | 5 x 5 x 2 | |
7440420018 | 1.8 | 2.4 | 2.4 | 40.00 | 4.8 x 4.8 x 2 | |
7440430018 | 1.8 | 2.7 | 2.5 | 20.00 | 4.8 x 4.8 x 3 | |
74405024015 | 1.5 | 2.1 | 3.5 | 60.00 | 2.5 x 2 x 1.2 | |
74405031015 | 1.5 | 2.2 | 4.1 | 64.00 | 3 x 3 x 1.2 | |
7440520018 | 1.8 | 2.6 | 3.0 | 30.00 | 5.8 x 5.8 x 2 | |
744052002 | 2.5 | 2.4 | 2.7 | 20.00 | 5.8 x 5.8 x 2 | |
744053002 | 2.6 | 3.0 | 2.7 | 20.00 | 5.8 x 5.8 x 3 | |
74406042015 | 1.5 | 3.9 | 3.1 | 25.00 | 4.8 x 4.8 x 2 | |
74406042022 | 2.2 | 3.4 | 2.7 | 33.00 | 4.8 x 4.8 x 2 | |
7440620015 | 1.5 | 4.3 | 4.0 | 10.00 | 6.8 x 6.8 x 2.5 | |
744062002 | 2.2 | 3.4 | 2.7 | 10.00 | 6.8 x 6.8 x 2.5 | |
7440680017 | 1.7 | 2.5 | 2.4 | 41.00 | 8 x 8 x 1.2 | |
7440690016 | 1.6 | 3.1 | 3.3 | 29.00 | 8 x 8 x 1.5 | |
7440690022 | 2.2 | 2.8 | 2.9 | 35.00 | 8 x 8 x 1.5 | |
7440700022 | 2.2 | 4.6 | 3.2 | 17.00 | 8 x 8 x 2 | |
74408941022 | 2.2 | 2.1 | 3.6 | 66.08 | 4.8 x 4.8 x 2.1 | |
74408942022 | 2.2 | 2.5 | 4.0 | 38.00 | 4.8 x 4.8 x 3 | |
74408943022 | 2.2 | 3.0 | 4.6 | 26.00 | 4.8 x 4.8 x 4.1 | |
74437321015 | 1.5 | 3.0 | 4.0 | 55.00 | 4.45 x 4.06 x 1.2 | |
74437321022 | 2.2 | 2.2 | 4.8 | 69.20 | 4.45 x 4.06 x 1.2 | |
74438324015 | 1.5 | 2.2 | 3.7 | 82.00 | 2.5 x 2 x 1.2 | |
74438336015 | 1.5 | 3.7 | 4.5 | 33.00 | 3 x 3 x 2 | |
74438336022 | 2.2 | 2.4 | 4.3 | 67.00 | 3 x 3 x 2 | |
7447462022 | 2.2 | 6.3 | 4.3 | 10.00 | 5.5 x 5.5 x 8.5 | |
744773018 | 1.8 | 2.7 | 3.6 | 28.00 | 4 x 4.5 x 3.48 | |
744773022 | 2.2 | 2.5 | 3.4 | 34.00 | 4 x 4.5 x 3.48 | |
744778002 | 2.2 | 4.0 | 4.8 | 14.00 | 7.3 x 7.3 x 3.4 | |
7447785002 | 2.2 | 2.9 | 3.3 | 43.00 | 5.9 x 6.2 x 3.3 | |
7447786002 | 2.2 | 3.5 | 4.0 | 40.00 | 5.9 x 6.2 x 5.1 | |
7447789002 | 2.2 | 4.0 | 4.8 | 19.00 | 7.3 x 7.3 x 3.5 | |
74479299222 | 2.2 | 2.1 | 3.5 | 85.00 | 3.2 x 2.5 x 1.2 | |
78438324015 | 1.5 | 2.2 | 3.7 | 82.00 | 2.5 x 2 x 1.2 | |
78438336015 | 1.5 | 3.7 | 4.5 | 33.00 | 3 x 3 x 2 | |
78438336022 | 2.2 | 2.4 | 4.3 | 67.00 | 3 x 3 x 2 | |
784773018 | 1.8 | 2.7 | 3.6 | 28.00 | 4 x 4.5 x 3.5 | |
784773022 | 2.2 | 2.5 | 3.4 | 34.00 | 4 x 4.5 x 3.5 |