Part A
AM26C31QDR
德州儀器
- Lifecycle
- Active
- Stock
- 1424 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The AM26C31QDR and AM26C31CDRE4 are functionally equivalent quad differential line drivers sharing the same AM26C31 core, logic function, and SOIC-16 package, making them viable substitutes in most RS-422/RS-485 transmission designs. The primary distinction lies in qualification grade and operating temperature range, so the AM26C31CDRE4 should be validated against the target application's thermal and reliability requirements before substitution.
Logic Function
High match
Package Type
High match
Operating Temperature Range
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
AM26C31CDRE4
德州儀器
- Lifecycle
- Active
- Stock
- 7084 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM26C31QDR | AM26C31CDRE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line driver | Both devices perform the same core function, so they are functionally interchangeable in RS-422/RS-485 driver applications. |
| Number of Drivers | 4 | 4 | Matching driver count ensures the same number of differential channels are available for the bus interface. |
| Supply Voltage (Typical) | 5 V | 5 V | Both operate from the same nominal 5 V supply, so no power rail redesign is required when substituting. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and match the signaling requirements of the target interface. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Identical maximum data rate means both support the same bus throughput without performance loss. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Same package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to 125 °C | -40 °C to 85 °C | The wider temperature range of the QDR variant matters for harsh or automotive-grade environments where the CDRE4 may not be rated. |
| Qualification / Grade | Automotive qualified (Q-grade) | Commercial grade | Automotive qualification affects reliability screening and suitability for automotive or mission-critical designs. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free (Green) | RoHS compliant, lead-free (Green) | Both meet the same environmental compliance requirements, so no compliance re-qualification is needed. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C31QDR | AM26C31CDRE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | - | Driver |
| Number of Drivers/Receivers | - | 4/0 |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Operating Temperature | - | 0°C ~ 70°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the AM26C31QDR and AM26C31CDRE4?
Both are quad differential line drivers from Texas Instruments that implement the RS-422/RS-485 physical layer. They provide four independent drivers with three-state outputs and are intended for balanced multipoint bus transmission.
What is the difference between the AM26C31QDR and AM26C31CDRE4?
The AM26C31QDR is supplied in a 16-pin SOIC package (D suffix) and is specified for the automotive temperature range of -40°C to 125°C (Q suffix). The AM26C31CDRE4 is supplied in the same 16-pin SOIC package but is specified for the commercial temperature range of 0°C to 70°C (C suffix). Both are RoHS-compliant tape-and-reel variants.
Are the AM26C31QDR and AM26C31CDRE4 pin-compatible?
Yes. Both devices use the same 16-pin SOIC (D) package with identical pin assignments, so they are pin-compatible and share the same PCB land pattern.
Can the AM26C31CDRE4 be used as a drop-in replacement for the AM26C31QDR?
Electrically and functionally they are the same device, but the AM26C31CDRE4 is only rated for 0°C to 70°C. It can replace the AM26C31QDR only in applications whose operating temperature stays within the commercial range; for -40°C to 125°C operation the Q-grade part must be retained.
What are the key electrical specifications common to both devices?
Both are 5 V devices with four differential drivers, three-state outputs, output current of ±60 mA, and they meet RS-422 and RS-485 requirements. They feature low supply current and are designed for balanced transmission lines.
What temperature range does each part support?
The AM26C31QDR is rated for -40°C to 125°C (automotive Q grade). The AM26C31CDRE4 is rated for 0°C to 70°C (commercial C grade).
Are both parts RoHS compliant and available in tape and reel?
Yes. Both the AM26C31QDR and AM26C31CDRE4 are RoHS-compliant and are supplied in tape-and-reel packaging for automated assembly.