CRMM4903C CR Micro 40V 21A Complementary MOSFET PDFN5x6D
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- 40 V / 21 A continuous drain current, PDFN5x6D package
- Rds(on) 29 mΩ typ, 35 mΩ max at VGS = 10 V
- Qg 10.5 nC and Ciss 454 pF
- N-channel, Complementary configuration
The CR Micro CRMM4903C is a 40 V 21 A N-channel complementary MOSFET in a PDFN5x6D package. One N-channel and one P-channel die share the package. On-resistance is 29 mΩ typical and 35 mΩ maximum at a 10 V gate drive; 37 mΩ typical at 4.5 V, so it also works from a logic-level driver; threshold voltage spans 1.1 to 2.1 V.
Key Specifications
| Drain-Source Voltage (VDS) | 40 V |
| Continuous Drain Current (ID) | 21 A |
| Circuit Configuration | Complementary |
| Rds(on) @ VGS = 10 V, typ. | 29 mΩ |
| Rds(on) @ VGS = 10 V, max. | 35 mΩ |
| Rds(on) @ VGS = 4.5 V, typ. | 37 mΩ |
| Gate Threshold Voltage (VGS(th)) | 1.1 – 2.1 V |
| Total Gate Charge (Qg) | 10.5 nC |
| Input Capacitance (Ciss) | 454 pF |
| Channel Polarity | N-channel |
| Package | PDFN5x6D |
Same-Rating Selection Table
| Part Number | VDS | ID | Config | Rds 10V typ | Rds 4.5V typ | Qg | Package |
|---|---|---|---|---|---|---|---|
| CRMD0403C | 40V | 32A | Complementary | 6.5 | 8 | 47.4 | PDFN5x6D |
| CRMD0409C | 40V | 21A | Complementary | 10 | 12 | 35.8 | PDFN5x6D |
| CRMM4903C | 40V | 21A | Complementary | 29 | 37 | 10.5 | PDFN5x6D |
3 part numbers share the same 40 / PDFN5x6D / Complementary rating — sorted by config.
Applications
Low-voltage DC-DC converters, load switches, battery protection, and brushed or stepper motor drive.
Selection Notes
- The two dies share a package but not a thermal path. Check whether the configuration is complementary, dual, common drain or series before wiring it into a topology.
- In complementary parts the N and P dies have different Rds(on) and Qg. Match the drive separately rather than assuming symmetry.
- Common-drain parts suit load switch and battery protection circuits where the two sources tie together — the body diodes then oppose each other and block in both directions.
- Because both dies sit on one leadframe, total dissipation is limited by the package, not by the individual die ratings.
Common Questions
Is the CRMM4903C an N-channel or P-channel device?
It is N-channel. The drain-source rating is 40 V.
Can the CRMM4903C be driven from a 4.5 V logic-level gate signal?
Yes. The datasheet characterises Rds(on) at 4.5 V: 37 mΩ typical and 45 mΩ maximum.
What is the gate threshold voltage of the CRMM4903C?
VGS(th) is specified between 1.1 and 2.1 V. Below the lower figure the part is off; above the upper figure it is fully on at the rated current.
What package does the CRMM4903C come in?
PDFN5x6D. Check the datasheet mechanical drawing for lead spacing and thermal pad dimensions before laying out the footprint.
How do I choose between the 3 part numbers in this rating group?
All 3 share the same voltage and package class. Sort by on-resistance first, then check gate charge: the lowest Rds(on) part is not automatically the best choice if the stage switches at high frequency. The table above lists them in ascending Rds(on) order.
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