Part A
AM26LS31CD
Texas Instruments
- Lifecycle
- Active
- Stock
- 2633 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26LS31CD and AM26LS32ACDE4 are not functionally interchangeable: the AM26LS31CD is a quad differential line driver, while the AM26LS32ACDE4 is a quad differential line receiver. Their signal direction, I/O architecture, and electrical roles differ fundamentally, so neither part can directly substitute for the other in a given circuit position.
Different device function
Driver vs. receiver
Different I/O direction
Different signal role
Parts at a glance
Part B
AM26LS32ACDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9006 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 | AM26LS32ACDE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line receiver | A driver and a receiver serve opposite roles in a differential link; they are not direct substitutes for the same socket function. |
| Device type | Line driver (transmitter) | Line receiver | Determines signal direction and whether the part can replace the other in a given circuit position. |
| Number of drivers/receivers | 4 drivers | 4 receivers | Channel count and direction must match the bus architecture for functional compatibility. |
| Output/input logic | Differential outputs (tri-state capable) | Differential inputs with TTL-compatible outputs | The electrical interface at each pin differs, so pin-to-pin substitution is not possible without redesign. |
| Supply voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a standard 5 V rail, so supply compatibility is maintained. |
| Package | SOIC-16 (D) | SOIC-16 (D) | Matching package and pin count allows board-level footprint compatibility even though functions differ. |
| Operating temperature range | 0°C to 70°C | 0°C to 70°C | Identical commercial temperature ratings mean environmental suitability is the same. |
| Standard compliance | Meets RS-422/RS-423 requirements | Meets RS-422/RS-423 requirements | Both target the same differential interface standards, supporting use in the same bus systems. |
| Tri-state / enable control | Output enable per driver | Input enable/fail-safe features | Control pin behavior differs between driver and receiver, affecting how each is gated in a system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS31CD | AM26LS32ACDE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Receiver |
| Protocol | RS422, RS485 | RS422, RS423 |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Receiver Hysteresis | - | 50 mV |
| 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 are the primary functional differences between the AM26LS31CD and AM26LS32ACDE4?
The AM26LS31CD is a quad differential line driver designed to meet the requirements of RS-422 and RS-485, while the AM26LS32ACDE4 is a quad differential line receiver intended for RS-422, RS-423, and RS-485 applications. The AM26LS31CD transmits differential signals, whereas the AM26LS32ACDE4 receives and converts differential signals to TTL-compatible outputs.
Are the AM26LS31CD and AM26LS32ACDE4 pin-compatible?
No. The AM26LS31CD is a 16-pin SOIC driver with enable and input pins, while the AM26LS32ACDE4 is a 16-pin SOIC receiver with input, output, and enable pins. Although both use a 16-pin SOIC package, their pin functions differ and they are not interchangeable.
What supply voltage do the AM26LS31CD and AM26LS32ACDE4 require?
Both devices operate from a single 5 V supply. The AM26LS31CD is specified for a 5 V nominal supply, and the AM26LS32ACDE4 is also specified for a 5 V nominal supply, consistent with their TTL-compatible interfaces.
Can the AM26LS31CD and AM26LS32ACDE4 be used together in a communication link?
Yes. The AM26LS31CD driver and AM26LS32ACDE4 receiver are commonly paired in balanced differential transmission systems, such as RS-422 or RS-485 links, where the driver transmits differential signals over a twisted pair and the receiver converts them back to TTL/CMOS logic levels.
What are the operating temperature ranges for the AM26LS31CD and AM26LS32ACDE4?
The AM26LS31CD is specified for operation over the commercial temperature range of 0°C to 70°C. The AM26LS32ACDE4 is specified for operation over the industrial temperature range of -40°C to 85°C, as indicated by the "I" suffix in its ordering code.
Do the AM26LS31CD and AM26LS32ACDE4 support tri-state outputs?
Yes. The AM26LS31CD driver features tri-state outputs controlled by a common enable pin, allowing the outputs to be placed in a high-impedance state. The AM26LS32ACDE4 receiver also provides tri-state outputs controlled by a common enable pin for bus-oriented applications.
What package type do the AM26LS31CD and AM26LS32ACDE4 use?
Both devices are offered in a 16-pin SOIC (Small Outline Integrated Circuit) package. The AM26LS31CD uses the SOIC-16 package, and the AM26LS32ACDE4 uses the SOIC-16 package with the "D" suffix indicating the SOIC package and "E4" indicating lead-free/RoHS-compliant construction.