Part A
AM26C31QDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1424 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The AM26C31QDR and AM26C31CDE4 are functionally equivalent quad differential line drivers sharing the same AM26C31 core, logic function, and channel count, making them viable substitutes in most designs. The primary distinction lies in package and qualification grade, so designers should confirm the SOIC-16 footprint and automotive qualification requirements before finalizing the replacement.
Logic Function
High match
Channel Count
High match
Package Type
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
AM26C31CDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 6869 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
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 | AM26C31CDE4 | 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 a 5 V supply, so the same power rail can be used without redesign. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and are essential for multipoint RS-422/RS-485 networks. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Identical maximum data rate means both support the same signaling speed requirements. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Package and mounting style affect PCB footprint and assembly; both use the same SOIC footprint here. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +85°C | The wider temperature range of the QDR variant suits harsher environments, while the CDE4 covers standard commercial/industrial conditions. |
| Qualification / Grade | Automotive qualified (Q-grade) | Commercial grade | Automotive qualification indicates stricter testing and reliability, which matters for automotive and high-reliability designs. |
| RoHS Compliance | RoHS compliant | RoHS compliant | Both meet RoHS, so either can be used in environmentally regulated product designs. |
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 | AM26C31CDE4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 AM26C31CDE4?
Both are quad differential line drivers from Texas Instruments that implement the RS-422/RS-485 electrical interface. They are functionally identical devices; the difference lies in package, ordering, and qualification designation.
What is the difference between the AM26C31QDR and AM26C31CDE4?
The AM26C31QDR is supplied in a 16-pin SOIC package (D suffix) on a large tape-and-reel (R suffix), while the AM26C31CDE4 is supplied in a 16-pin SOIC tube (D suffix) with the E4 Pb-free/Green orderable designation. Both use the same die and electrical specifications.
Are the AM26C31QDR and AM26C31CDE4 electrically interchangeable?
Yes. Both devices share the same datasheet specifications, including supply voltage range of 4.5 V to 5.5 V, differential output drive, and RS-422/RS-485 compatibility. They differ only in packaging and orderable part designation.
What is the operating temperature range for these devices?
The AM26C31 family is specified for operation from -40°C to +85°C, covering industrial temperature requirements. Both the QDR and CDE4 orderables fall within this range.
What supply voltage do the AM26C31QDR and AM26C31CDE4 require?
Both devices operate from a single 5 V nominal supply, with a specified range of 4.5 V to 5.5 V. They are not intended for 3.3 V operation.
Can the AM26C31QDR and AM26C31CDE4 be used interchangeably in an existing PCB design?
Yes, provided the PCB accepts the 16-pin SOIC (D) footprint, which both orderables use. The pinout and electrical characteristics are identical, so substitution is possible without layout changes.
What is the significance of the "E4" suffix on the AM26C31CDE4?
The E4 suffix denotes Texas Instruments' Pb-free and Green (RoHS-compliant) orderable designation. The AM26C31QDR is also supplied as a Pb-free/RoHS-compliant device; the suffix difference reflects ordering and packaging conventions rather than a functional difference.
Which device should be selected for high-volume automated assembly?
The AM26C31QDR is supplied on tape-and-reel, making it suitable for automated pick-and-place assembly lines. The AM26C31CDE4 is supplied in tubes, which is typically preferred for low-volume or prototype builds.