Part A
AM26LS31CD
Texas Instruments
- Lifecycle
- Active
- Stock
- 2633 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The AM26LS31CDE4 is a functionally equivalent variant of the AM26LS31CD, differing only in packaging designation while sharing the same quad differential line driver architecture, electrical characteristics, and operating conditions. Both parts are interchangeable for new designs and existing BOMs, with the E4 suffix denoting a manufacturer packaging/ordering variant rather than a functional deviation.
Function and Output Type
High match
Pinout and Package
High match
Supply Voltage and Electrical Ratings
High match
Operating Temperature Range
High match
Parts at a glance
Part B
AM26LS31CDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8888 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 | AM26LS31CD | AM26LS31CDE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line driver | Both parts perform the same core function, so they are functionally interchangeable in a circuit. |
| Number of Drivers | 4 | 4 | The driver count determines how many differential lines each device can drive; identical counts ensure equivalent channel capacity. |
| Supply Voltage Range | 4.75 V to 5.25 V | 4.75 V to 5.25 V | Matching supply ranges confirm both parts operate in the same 5 V system without requiring rail adjustments. |
| Output Type | Differential (tri-state) | Differential (tri-state) | Tri-state differential outputs allow bus sharing and match the signaling requirements of RS-422/RS-485 style interfaces. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Identical package and mounting style ensure the parts are drop-in compatible on the same PCB footprint. |
| Operating Temperature Range | 0°C to 70°C | 0°C to 70°C | The same commercial temperature range means both parts suit the same environmental conditions. |
| RoHS / Lead-Free Status | RoHS compliant (lead-free / green) | RoHS compliant (lead-free / green) | Both meet the same environmental compliance requirements, so neither introduces a compliance conflict in the design. |
| Data Rate Capability | Up to 10 Mbps | Up to 10 Mbps | Equivalent data-rate capability ensures both parts support the same signaling speed in the target application. |
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 | AM26LS31CD | AM26LS31CDE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Driver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 4/0 | 4/0 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AM26LS31CD and the AM26LS31CDE4?
The AM26LS31CD and AM26LS31CDE4 are both Texas Instruments quad differential line drivers from the AM26LS31 family. The primary difference is the ordering suffix: the AM26LS31CD is supplied in a standard SOIC-16 tube/rail packaging configuration, while the AM26LS31CDE4 suffix denotes a specific lead finish and packaging option (Pb-free/RoHS-compliant NiPdAu lead finish, supplied in tube form). Both share the same electrical specifications, function, and 16-pin SOIC (D) package outline.
Are the AM26LS31CD and AM26LS31CDE4 electrically and functionally interchangeable?
Yes. Both devices are the same quad differential line driver die with identical electrical characteristics, including supply voltage range of 4.75 V to 5.25 V, output drive capability, propagation delays, and pinout. They differ only in the ordering suffix that specifies lead finish and packaging. They can be used interchangeably in the same PCB footprint, provided the lead-finish/RoHS requirement of the application is satisfied.
What is the function of the AM26LS31CD/AM26LS31CDE4?
These devices are quad differential line drivers designed to meet the requirements of RS-422 and RS-423 (and compatible with RS-485 signaling in many applications). Each device contains four independent drivers with three-state outputs, intended for balanced (differential) data transmission over twisted-pair or parallel-wire lines. They are commonly used for digital data transmission, clock distribution, and interfacing in industrial and communication systems.
What package and pin count do the AM26LS31CD and AM26LS31CDE4 use?
Both parts are offered in the 16-pin SOIC package, designated by the "D" suffix in the orderable part number. The package is a small-outline integrated circuit with 16 gull-wing leads on a 1.27 mm pitch. The pinout includes four driver inputs, four differential output pairs (A and B outputs), a common enable, and supply/ground pins.
What supply voltage and operating temperature range do these devices support?
Both the AM26LS31CD and AM26LS31CDE4 operate from a single 5 V supply, with a recommended supply voltage range of 4.75 V to 5.25 V. The "C" suffix indicates the commercial temperature grade, with an operating free-air temperature range of 0°C to 70°C, as specified in the Texas Instruments datasheet.
Do the AM26LS31CD and AM26LS31CDE4 support three-state outputs?
Yes. Both devices feature three-state (high-impedance) outputs controlled by a common enable input. When the enable is deasserted, all four driver outputs are placed in a high-impedance state, allowing the outputs to be disconnected from the bus for multiplexing or shared-line applications.
Which applications are the AM26LS31CD and AM26LS31CDE4 suitable for?
These quad differential line drivers are suitable for RS-422/RS-423 balanced data transmission, digital and clock signal distribution over twisted-pair cable, industrial control and instrumentation interfaces, and general-purpose differential line driving where a 5 V supply and commercial temperature range are acceptable. They are not intended for harsh-environment or extended-temperature applications, which would require an industrial or military temperature-grade variant.