Part A
AM26C32IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6435 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31IDE4 are complementary quad differential bus devices with opposing signal directions: the AM26C32IDR is a quad differential line receiver, while the AM26C31IDE4 is a quad differential line driver. Because their core function, I/O direction, and electrical role in a bus system are fundamentally different, they cannot be substituted for one another in the same socket or circuit position. Designers must select the device that matches the required signal flow rather than treating these parts as interchangeable.
Different device function
Opposite signal direction
Different I/O role
Not functionally interchangeable
Parts at a glance
Part B
AM26C31IDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3690 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
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 | AM26C31IDE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver perform opposite signal-direction roles, so they are not directly interchangeable in a given socket. |
| 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 multiple devices to share a bus, but the output stage type differs between receiver and driver. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power-rail compatibility is maintained. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Matching package and mounting style supports PCB footprint compatibility. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure comparable environmental robustness. |
| 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 target the same differential interface standards, but one is the receiver side and the other the driver side. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32IDR | AM26C31IDE4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 | -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 primary functional differences between the AM26C32IDR and AM26C31IDE4?
The AM26C32IDR is a quad differential line receiver, while the AM26C31IDE4 is a quad differential line driver. They perform complementary functions in RS-422/RS-485 communication systems: the AM26C31IDE4 drives signals onto a balanced transmission line, and the AM26C32IDR receives those differential signals at the other end.
Are the AM26C32IDR and AM26C31IDE4 pin-compatible?
Both devices are offered in 16-pin SOIC (D) packages with the same pin count, but their pin functions differ because one is a driver and the other is a receiver. They are not functionally interchangeable on the same PCB footprint without redesigning the signal path, even though the package outline is identical.
What supply voltage do the AM26C32IDR and AM26C31IDE4 require?
Both devices operate from a single 5 V supply (nominally 4.5 V to 5.5 V), consistent with the standard AM26C31/AM26C32 families. Designers should confirm the exact recommended operating range in the respective manufacturer datasheets before finalizing the power supply.
Can the AM26C32IDR and AM26C31IDE4 be used together in the same RS-422 link?
Yes. A typical full-duplex or multidrop RS-422/RS-485 link uses the AM26C31IDE4 as the line driver at the transmitting end and the AM26C32IDR as the line receiver at the receiving end. Their complementary driver/receiver roles make them a matched pair for balanced differential data transmission.
What is the difference between the IDR and IDE4 orderable suffixes?
The suffixes denote packaging and ordering format rather than electrical function. The "IDR" suffix on the AM26C32IDR indicates a 16-pin SOIC (D) package supplied in tape-and-reel form, while the "IDE4" suffix on the AM26C31IDE4 indicates a 16-pin SOIC (D) package in a specific tube/rail or alternate packing option. Electrical performance is defined by the base part number, not the suffix.
Do both devices support the same data rate and signaling standard?
Both are designed for balanced differential signaling compatible with RS-422 and RS-485 interfaces. The AM26C31IDE4 driver and AM26C32IDR receiver are specified for operation at data rates typical of these standards (up to approximately 10 Mbps for the AM26C31/AM26C32 family). Exact switching and propagation specifications should be verified in the manufacturer datasheets.
Which device should be selected for a unidirectional transmit-only application?
For a transmit-only path, the AM26C31IDE4 (driver) is the appropriate choice because it converts single-ended logic inputs into differential outputs. The AM26C32IDR (receiver) would be used at the receiving end to convert the differential signal back to single-ended logic levels.