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 AM26C32CDR and AM26C31IDR are complementary devices rather than interchangeable parts: the AM26C32CDR 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 system differ fundamentally, so one cannot directly substitute for the other in an existing design.
Different signal direction
Different I/O function
Different output type
Different application role
Parts at a glance
Part B
AM26C32CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2477 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 | AM26C32CDR | AM26C31IDR | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver serve opposite roles in a differential bus; they are not direct substitutes for the same socket function. |
| Number of Drivers / Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines whether the device transmits or receives differential signals on the bus. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) driver outputs | Tri-state capability allows multiple devices to share a bus without contention; the direction of the tri-state output differs between the two parts. |
| Input/Output Logic Direction | Differential inputs, single-ended outputs | Single-ended inputs, differential outputs | Defines signal flow; a receiver converts bus differential signals to logic levels, while a driver converts logic levels to differential bus signals. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained, though their internal functions differ. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range supports use in similar environments, but does not make the parts functionally interchangeable. |
| Package | SOIC-16 (16-pin) | SOIC-16 (16-pin) | Same package and pin count allow board-level footprint compatibility, but pin functions differ between driver and receiver. |
| Standard Compliance | TIA/EIA-422-B and TIA/EIA-423-B compatible receiver | TIA/EIA-422-B and TIA/EIA-423-B compatible driver | Both meet the same differential interface standards, but one is specified as a receiver and the other as a driver under those standards. |
| Typical Data Rate | Up to 10 Mbps (receiver) | Up to 10 Mbps (driver) | Similar signaling speed capability, but the achievable link depends on pairing a driver with a receiver rather than substituting one for the other. |
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 | AM26C31IDR | AM26C32CDR |
|---|---|---|
| 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 | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Protocol | - | RS422, RS423 |
| Receiver Hysteresis | - | 60 mV |
Frequently asked questions
What are the primary functional differences between the AM26C32CDR and AM26C31IDR?
The AM26C32CDR is a quad differential line receiver, while the AM26C31IDR is a quad differential line driver. The AM26C32CDR receives differential signals and converts them to TTL-compatible outputs, whereas the AM26C31IDR accepts TTL inputs and drives differential outputs compliant with RS-422 and RS-485 standards.
Are the AM26C32CDR and AM26C31IDR pin-compatible and can they be used as drop-in replacements for each other?
No. Although both devices are offered in the same 16-pin SOIC package (D suffix), they are not functionally interchangeable. The AM26C32CDR is a receiver with high-impedance differential inputs and tri-state TTL outputs, while the AM26C31IDR is a driver with TTL inputs and differential outputs. Pin functions differ, so substituting one for the other in an existing PCB design is not valid.
What are the recommended supply voltage and operating temperature ranges for these devices?
Both the AM26C32CDR and AM26C31IDR operate from a single 5 V supply (nominal). The AM26C32CDR is specified over a temperature range of –40°C to 85°C (C suffix). The AM26C31IDR is specified over –40°C to 85°C (I suffix). Both are members of the AM26C31/32 family and share the same 5 V nominal supply requirement.
Do the AM26C32CDR and AM26C31IDR support RS-422 and RS-485 communication standards?
Yes. The AM26C31IDR differential line driver is designed to meet the requirements of RS-422 and RS-485 (TIA/EIA-422-B and TIA/EIA-485-A) for balanced transmission. The AM26C32CDR receiver is designed to receive RS-422 and RS-485 differential signals and provides TTL-compatible outputs. Together they form a complete RS-422/RS-485 interface pair.
What are the key AC switching characteristics of the AM26C31IDR driver and AM26C32CDR receiver?
Per the Texas Instruments datasheets, the AM26C31IDR driver features typical propagation delay times on the order of tens of nanoseconds and supports data rates suitable for RS-422/RS-485 applications. The AM26C32CDR receiver also exhibits propagation delays in the tens of nanoseconds range. Exact maximum values depend on load conditions and supply voltage; designers should consult the respective TI datasheets for guaranteed limits.
What output structures do these devices provide, and how does that affect bus interfacing?
The AM26C31IDR provides differential tri-state outputs, allowing multiple drivers to share a bus when disabled. The AM26C32CDR provides tri-state TTL outputs with a built-in input fail-safe feature that ensures a known high output state when the differential inputs are open or undriven. These features support multi-point and party-line bus configurations.
Are the AM26C32CDR and AM26C31IDR available in the same package and pin count?
Both devices are offered in a 16-pin SOIC package (D suffix) and are also available in other package options per TI. The AM26C32CDR and AM26C31IDR specifically denote the 16-pin SOIC tape-and-reel variants. Despite identical package and pin count, pin assignments and functions differ between the receiver and driver, so they are not interchangeable.
What input and output voltage levels are compatible with the AM26C32CDR and AM26C31IDR?
The AM26C31IDR accepts TTL-level inputs and produces differential outputs with a common-mode range suitable for RS-422/RS-485. The AM26C32CDR accepts differential inputs over the RS-422/RS-485 common-mode range and provides TTL-compatible outputs. Both devices are designed for 5 V systems and interface directly with standard TTL logic.