Part A
AM26C32CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2477 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32CDR and AM26C31IDRE4 are complementary rather than interchangeable devices: the AM26C32CDR is a quad differential line receiver, while the AM26C31IDRE4 is a quad differential line driver. Their signal direction, I/O architecture, and functional roles differ fundamentally, so neither part can directly substitute for the other in an existing design without re-engineering the interface.
Different signal direction
Different I/O function
Different interface role
Different application topology
Parts at a glance
Part B
AM26C31IDRE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9269 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 | AM26C31IDRE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver serve opposite roles in a differential link; they are not direct substitutes for the same board position. |
| Number of Drivers | 0 | 4 | Driver count determines whether the device can transmit differential signals onto a bus. |
| Number of Receivers | 4 | 0 | Receiver count determines whether the device can accept differential signals from a bus. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) driver outputs | Tri-state capability allows sharing a common bus, but the output stage type differs between receiving and driving. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained. |
| Package | SOIC-16 (D) | SOIC-16 (D) | Matching package and pin count supports similar PCB footprint, though pin functions differ. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit the same industrial ambient conditions. |
| 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 interface standards, but one is the compliant receiver and the other the compliant driver. |
| Input/Output Direction | Differential inputs to single-ended outputs | Single-ended inputs to differential outputs | Signal flow direction is opposite, so they cannot replace each other in the same circuit node. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32CDR | AM26C31IDRE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| 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 primary functional differences between the AM26C32CDR and the AM26C31IDRE4?
The AM26C32CDR is a quad differential line receiver, while the AM26C31IDRE4 is a quad differential line driver. They perform complementary functions in an RS-422/RS-485 signal chain: the AM26C31IDRE4 drives the differential bus, and the AM26C32CDR receives the differential signal at the other end.
Are the AM26C32CDR and AM26C31IDRE4 pin-compatible and package-compatible?
Both devices are offered in a 16-pin SOIC package (D suffix), so they share the same package footprint and lead count. However, because one is a receiver and the other is a driver, the internal pin functions differ, so they are not interchangeable on the same PCB location despite package similarity.
What supply voltage do the AM26C32CDR and AM26C31IDRE4 require?
Both devices operate from a single 5 V nominal supply. The AM26C32CDR receiver and the AM26C31IDRE4 driver are specified for 5 V operation, consistent with the standard RS-422/RS-485 logic and bus signaling environment.
What is the difference between the C and I temperature grade suffixes on these parts?
The "C" in AM26C32CDR denotes a commercial temperature range, while the "I" in AM26C31IDRE4 denotes an industrial temperature range. The industrial-grade device is specified for a wider operating temperature range than the commercial-grade device, making it suitable for harsher environments.
What does the "E4" suffix on the AM26C31IDRE4 indicate?
The "E4" suffix is a Texas Instruments package/ordering designator indicating Pb-free (RoHS-compliant) construction. The AM26C32CDR is also available in RoHS-compliant ordering variants; designers should confirm the specific orderable part number's environmental compliance from the manufacturer datasheet.
Can the AM26C32CDR and AM26C31IDRE4 be used together in the same RS-422/RS-485 link?
Yes. The AM26C31IDRE4 quad driver can transmit differential signals over a twisted-pair bus, and the AM26C32CDR quad receiver can receive those signals at the far end. This driver/receiver pairing is a standard configuration for balanced differential data transmission.
Do both devices support tri-state output control?
Yes. The AM26C31IDRE4 driver provides tri-state outputs controlled by enable pins, allowing the driver to be disconnected from the bus. The AM26C32CDR receiver also provides tri-state outputs, enabling the receiver outputs to be placed in a high-impedance state when not selected.
Are the AM26C32CDR and AM26C31IDRE4 drop-in replacements for each other?
No. Because one is a line receiver and the other is a line driver, they are functionally different devices and cannot be substituted for one another. Selection must be based on whether the circuit position requires a driver or a receiver, along with the required temperature grade.