Part A
AM26C31CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5213 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31CDR are complementary devices rather than interchangeable parts: the AM26C32IDR is a quad differential line receiver, while the AM26C31CDR is a quad differential line driver. Their signal direction, I/O architecture, and functional role in a bus system are fundamentally different, so one cannot directly replace the other in an existing design without re-engineering the interface.
Different signal direction
Different I/O function
Different bus role
Different application circuit
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 | AM26C31CDR | Why it matters |
|---|---|---|---|
| Function | Quadruple Differential Line Receiver | Quadruple Differential Line Driver | Determines the signal direction role in an RS-422/RS-485 link; a receiver cannot directly replace a driver. |
| Number of Drivers / Receivers | 0 Drivers / 4 Receivers | 4 Drivers / 0 Receivers | Defines how many differential channels are driven versus received, which is fundamental to circuit topology. |
| Output Type | Tri-state (3-state) receiver outputs | Tri-state (3-state) driver outputs | Tri-state capability allows bus sharing; the nature of the output (receiver logic vs. differential driver) affects bus interfacing. |
| Supply Voltage (VCC) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate on a 5 V nominal supply, so power rail compatibility is maintained. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rates ensure comparable throughput when used together in a link. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The wider industrial range of the receiver allows use in harsher environments than the commercial-range driver. |
| Package / Mounting | 16-SOIC, Surface Mount | 16-SOIC, Surface Mount | Identical package and footprint enable drop-in board-level compatibility. |
| Input/Output Compatibility Standard | RS-422 / RS-485 receiver | RS-422 / RS-485 driver | Confirms both belong to the same differential signaling family but occupy complementary roles. |
| Typical Application Role | Receiving differential bus signals | Transmitting differential bus signals | Clarifies that the two parts are complementary, not interchangeable, in a transceiver pair. |
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 | AM26C31CDR | 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 | 0°C ~ 70°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 AM26C31CDR?
The AM26C32IDR is a quad differential line receiver and the AM26C31CDR is a quad differential line driver, both from Texas Instruments and compliant with the TIA/EIA-422-B and ITU-T V.11 standards. They are complementary devices typically used together in balanced differential data transmission systems.
What is the functional difference between the AM26C32IDR and AM26C31CDR?
The AM26C31CDR is a line driver that converts single-ended logic inputs into differential outputs to transmit data over balanced lines. The AM26C32IDR is a line receiver that accepts differential inputs and converts them back to single-ended logic outputs. One drives the bus; the other receives from it.
Are the AM26C32IDR and AM26C31CDR pin-compatible or interchangeable?
No. They are not interchangeable because they perform opposite functions (driver vs. receiver) and have different pin functions and internal circuitry, even though both are offered in the same SOIC-16 (D) package. Each must be used in its designated driver or receiver role.
What package and operating temperature range do the AM26C32IDR and AM26C31CDR use?
Both devices are supplied in a 16-pin SOIC package (suffix D, tape-and-reel suffix R) and are specified for the industrial temperature range of -40°C to +85°C.
What supply voltage do the AM26C32IDR and AM26C31CDR require?
Both devices operate from a single 5 V nominal supply (VCC), with the datasheet specifying operation over the 4.5 V to 5.5 V range.
Do the AM26C32IDR and AM26C31CDR support tri-state or high-impedance outputs?
Yes. The AM26C31CDR driver provides tri-state outputs controlled by an enable pin, allowing the differential outputs to be placed in a high-impedance state. The AM26C32IDR receiver provides a tri-state capability on its outputs via an enable control, permitting bus sharing.
Can the AM26C32IDR and AM26C31CDR be used together in the same system?
Yes. Because they are complementary TIA/EIA-422-B compliant devices, the AM26C31CDR driver and AM26C32IDR receiver are commonly paired to form a complete balanced differential transmission link, with the driver on the transmit end and the receiver on the receive end.
What are typical applications for the AM26C32IDR and AM26C31CDR?
They are used in balanced differential data transmission over twisted-pair or parallel cables, including industrial control, point-to-point and multidrop bus systems, and other TIA/EIA-422-B serial communication links where noise immunity from differential signaling is required.