Part A
AM26LS32AIDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1798 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The AM26LS32AIDR and AM26LS31CDE4 are not functionally interchangeable: the AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDE4 is a quad differential line driver. Their signal direction, I/O architecture, and internal circuitry differ fundamentally, so neither part can directly substitute for the other in an existing design without re-engineering the interface.
Different signal direction
Receiver vs. driver function
Different I/O architecture
Not pin-function compatible
Parts at a glance
Part B
AM26LS31CDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8888 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM26LS32AIDR | AM26LS31CDE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver and driver are complementary but not interchangeable; one receives differential signals while the other transmits them. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines the direction of signal flow and whether the device can be used at the transmitting or receiving end of a bus. |
| Output Type | Tri-state (3-state) outputs | Tri-state (3-state) outputs | Tri-state capability allows multiple devices to share a common bus without contention. |
| Supply Voltage (Vcc) | 5 V (4.75 V to 5.25 V) | 5 V (4.75 V to 5.25 V) | Both require a nominal 5 V supply, so power rail compatibility is maintained in a shared system. |
| Operating Temperature Range | -40°C to +85°C | 0°C to +70°C | The wider industrial temperature range of the receiver suits harsher environments, while the driver is limited to commercial temperatures. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Matching package and footprint simplifies PCB layout and potential board-level substitution. |
| Standard Compliance | Meets RS-422, RS-423, and RS-485 requirements | Meets RS-422 and RS-423 requirements | Compliance with specific serial standards determines interoperability with other bus transceivers in the system. |
| Input/Output Compatibility | Differential inputs with ±7 V common-mode range | Differential outputs with ±7 V common-mode range | Common-mode range affects noise immunity and the ability to operate over long cable runs in noisy environments. |
| Data Rate Capability | Up to 10 Mbps | Up to 10 Mbps | Both support similar signaling rates, so throughput is not a differentiator when pairing them in a link. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS32AIDR | AM26LS31CDE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Protocol | RS422, RS423 | RS422, RS485 |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Receiver Hysteresis | 50 mV | - |
Frequently asked questions
What are the primary functional differences between the AM26LS32AIDR and the AM26LS31CDE4?
The AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDE4 is a quad differential line driver. The AM26LS32AIDR is designed to receive balanced differential signals compliant with RS-422, RS-423, and RS-485 standards, whereas the AM26LS31CDE4 is designed to transmit balanced differential signals meeting RS-422 specifications.
Are the AM26LS32AIDR and AM26LS31CDE4 pin-compatible and can they be used as direct substitutes for each other?
No. Although both devices are offered in 16-pin SOIC packages, they are not functionally interchangeable. The AM26LS32AIDR is a receiver with input pins and output pins configured for reception, while the AM26LS31CDE4 is a driver with input pins and output pins configured for transmission. Pin functions and internal circuitry differ, so one cannot directly replace the other in a given socket without redesigning the signal path.
What are the supported data signaling standards for each device?
The AM26LS32AIDR receiver supports RS-422, RS-423, and RS-485 differential signaling standards. The AM26LS31CDE4 driver is specified for RS-422 balanced differential signaling. Designers should confirm the target interface standard against the respective datasheet before pairing these devices in a communication link.
What are the operating temperature ranges for the AM26LS32AIDR and AM26LS31CDE4?
The AM26LS32AIDR is specified for the industrial temperature range of -40°C to +85°C. The AM26LS31CDE4 is specified for the commercial temperature range of 0°C to +70°C. The wider industrial range of the receiver makes it suitable for harsher environments, while the driver is intended for commercial-grade applications.
What package types are available for these two devices?
Both the AM26LS32AIDR and the AM26LS31CDE4 are offered in 16-pin SOIC (Small Outline Integrated Circuit) packages. The "D" suffix in both part numbers denotes the SOIC package option. Designers should verify the exact package drawing and land pattern from the respective manufacturer datasheet before layout.
Can the AM26LS32AIDR and AM26LS31CDE4 be used together in a single communication link?
Yes, they are complementary devices. The AM26LS31CDE4 quad driver can transmit RS-422 balanced differential signals over a twisted-pair cable, and the AM26LS32AIDR quad receiver can receive those signals at the far end. This driver-receiver pairing is a common configuration for point-to-point or multidrop balanced serial links, provided the system-level voltage, termination, and temperature requirements are satisfied.
What are the supply voltage requirements for the AM26LS32AIDR and AM26LS31CDE4?
Both devices operate from a single 5 V nominal supply. The AM26LS32AIDR receiver and the AM26LS31CDE4 driver are both specified for 5 V operation per their respective manufacturer datasheets. Designers should consult the datasheets for the exact recommended operating supply voltage range and tolerances.
Do these devices include fail-safe or high-impedance features relevant to bus design?
The AM26LS32AIDR receiver includes a fail-safe feature that ensures a known high output state when the inputs are open or undriven, which is useful for bus idle conditions. The AM26LS31CDE4 driver provides a high-impedance output state when disabled, allowing multiple drivers to share a bus. Designers should verify the exact enable and fail-safe behavior in the respective datasheets for their specific application.