Part A
AM26C31IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2239 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31IDR are complementary devices rather than interchangeable parts: the AM26C32IDR is a quad differential line receiver, while the AM26C31IDR is a quad differential line driver. Their signal direction, I/O architecture, and functional role in a bus system differ fundamentally, so one cannot directly replace the other in an existing design without reworking the circuit topology.
Different signal direction
Receiver vs. driver function
Different I/O architecture
Circuit redesign required
Parts at a glance
Part B
AM26C32IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6435 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, 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 | AM26C32IDR | AM26C31IDR | Why it matters |
|---|---|---|---|
| Function | Quadruple Differential Line Receiver | Quadruple Differential Line Driver | Determines the signal direction; a receiver cannot replace a driver in a transmission link, so they are not functionally interchangeable. |
| Number of Drivers / Receivers | 0 Drivers / 4 Receivers | 4 Drivers / 0 Receivers | Defines the I/O configuration of the device; the two parts perform opposite roles in a differential bus system. |
| Output Type | Tri-state (receiver outputs) | Tri-state (driver outputs) | Tri-state capability allows bus sharing, but the outputs drive different signal types (single-ended logic vs. differential). |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a standard 5 V supply, so power rail compatibility is maintained between the two parts. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rates confirm both support the same RS-422/RS-485 signaling speeds for balanced transmission. |
| Input/Output Compatibility Standard | RS-422, RS-485 (receiver) | RS-422, RS-485 (driver) | Both target the same differential bus standards, but one receives and the other transmits, so they complement rather than replace each other. |
| Package | 16-SOIC | 16-SOIC | Identical package and pin count allow PCB footprint compatibility, though pin functions differ between driver and receiver. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures both can be used in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C31IDR | AM26C32IDR |
|---|---|---|
| Part Status | Active | Active |
| Type | Driver | Receiver |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Protocol | - | RS422, RS423 |
| Receiver Hysteresis | - | 60 mV |
Frequently asked questions
What are the AM26C32IDR and AM26C31IDR?
The AM26C32IDR is a quad differential line receiver, while the AM26C31IDR is a quad differential line driver. Both are members of the AM26C series of RS-422/RS-485 interface devices from Texas Instruments, housed in a 16-pin SOIC package (D suffix) and specified for operation over the -40°C to +85°C temperature range.
Can the AM26C32IDR and AM26C31IDR be used together in a communication link?
Yes. The AM26C31IDR driver and AM26C32IDR receiver are designed to operate as a complementary pair in balanced differential data transmission systems. The driver converts TTL/CMOS logic inputs to differential outputs, and the receiver converts differential inputs back to TTL/CMOS logic levels, supporting RS-422 and RS-485 style signaling.
What is the key functional difference between the AM26C32IDR and AM26C31IDR?
The AM26C31IDR is a line driver with four differential outputs and tri-state enable control, intended to transmit signals onto a balanced bus. The AM26C32IDR is a line receiver with four differential inputs and a common receiver enable, intended to receive signals from a balanced bus. They perform opposite signal-direction functions and are not interchangeable.
Do the AM26C32IDR and AM26C31IDR share the same pinout and package?
Both devices are offered in the same 16-pin SOIC (D) package, but their pin functions differ because one is a driver and the other is a receiver. Pin assignments are defined in the respective Texas Instruments datasheets, so PCB layouts must follow the correct device pinout and cannot be treated as pin-compatible substitutes.
What supply voltage do the AM26C32IDR and AM26C31IDR require?
Both devices operate from a single 5 V nominal supply, consistent with the AM26C series specifications published by Texas Instruments. Designers should confirm the exact recommended operating conditions in the current datasheet for each device before finalizing a design.
Are the AM26C32IDR and AM26C31IDR specified for the same temperature range?
Yes. Both the AM26C32IDR and AM26C31IDR are specified for the industrial temperature range of -40°C to +85°C, as indicated by the "I" suffix in the part number and confirmed in the Texas Instruments datasheets.
Can the AM26C32IDR be substituted for the AM26C31IDR in an existing design?
No. Because the AM26C32IDR is a receiver and the AM26C31IDR is a driver, they perform opposite functions and cannot be substituted for one another. A design requiring a driver must use a driver such as the AM26C31IDR, and a design requiring a receiver must use a receiver such as the AM26C32IDR.