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 AM26C31IDRE4 are functionally equivalent quad differential line drivers sharing the same logic family, package, and pinout, making them viable substitutes in most designs. The primary distinction lies in their qualification grades and operating temperature ranges, so the final selection should be validated against the target application's environmental and compliance requirements.
Function and Logic Family
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
AM26C31IDRE4
德州儀器
- Lifecycle
- Active
- Stock
- 9269 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 | AM26C31IDRE4 | 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 match the signaling requirements of the target interface. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and mounting style 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 industrial or automotive environments requiring extended thermal tolerance. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rate capability ensures equivalent throughput for the communication link. |
| RoHS Compliance | RoHS compliant | RoHS compliant | Both meet RoHS requirements, so either can be used in environmentally regulated 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 | AM26C31IDRE4 |
|---|---|---|
| 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 | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the AM26C31QDR and AM26C31IDRE4?
Both are quad differential line drivers from Texas Instruments, part of the AM26C31 family. They are designed to meet the requirements of ANSI TIA/EIA-422-B and ITU Recommendation V.11, and are used to drive balanced transmission lines in digital data transmission systems.
What is the difference between the AM26C31QDR and AM26C31IDRE4?
The primary difference is the operating temperature range and the corresponding qualification grade. The AM26C31QDR is specified for the automotive temperature range of -40°C to 125°C (Q-grade), while the AM26C31IDRE4 is specified for the industrial temperature range of -40°C to 85°C (I-grade). Both are offered in the same SOIC-16 package and are supplied in tape-and-reel packaging.
Are the AM26C31QDR and AM26C31IDRE4 pin-compatible?
Yes. Both devices are offered in 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 AM26C31IDRE4 be used as a drop-in replacement for the AM26C31QDR?
Functionally and pin-wise they are interchangeable, but the AM26C31IDRE4 is only rated for -40°C to 85°C, whereas the AM26C31QDR is rated for -40°C to 125°C. The IDRE4 should only replace the QDR in applications where the ambient and junction temperatures remain within the industrial range and the automotive qualification is not required.
What are the key electrical specifications common to both devices?
Both devices operate from a single 5 V supply, feature 3-state outputs, and provide typical output skew and propagation delay suitable for balanced line driving. They meet TIA/EIA-422-B and V.11 requirements and are characterized for output differential voltage and short-circuit protection per the manufacturer datasheet.
Do both parts support 3-state output control?
Yes. Both the AM26C31QDR and AM26C31IDRE4 provide independent 3-state output control via enable inputs, allowing the outputs to be placed in a high-impedance state for bus-oriented applications.
What packaging do the AM26C31QDR and AM26C31IDRE4 use?
Both are supplied in the 16-pin SOIC (D) package in tape-and-reel form. The "R" suffix in both orderable part numbers indicates tape-and-reel packaging, and the "E4" suffix on the IDRE4 denotes Pb-free (RoHS-compliant) construction per Texas Instruments ordering conventions.
Which part should be selected for automotive or high-temperature applications?
The AM26C31QDR should be selected for automotive or high-temperature applications because it is specified over the -40°C to 125°C temperature range. The AM26C31IDRE4 is limited to the -40°C to 85°C industrial range and should not be used where the automotive temperature range is required.