Part A
AM26LS32AIDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1798 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The AM26LS32AIDR and AM26LS31CDG4 are not functionally interchangeable: the AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDG4 is a quad differential line driver. Their signal direction, I/O architecture, and electrical roles differ fundamentally, so substituting one for the other is not viable in existing designs.
Different signal direction
Receiver vs driver function
Different I/O architecture
Not pin-function compatible
Parts at a glance
Part B
AM26LS31CDG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8504 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM26LS32AIDR | AM26LS31CDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver vs. driver roles are complementary, not interchangeable; a receiver cannot replace a driver in a transmission link. |
| Interface Standard | RS-422, RS-423, RS-485 (receiver) | RS-422, RS-423 (driver) | Determines which serial bus protocols the device can legally and reliably operate within. |
| Number of Drivers / Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Defines the signal direction capability; the two parts serve opposite ends of a differential link. |
| Output Type | Tri-state (3-state) receiver outputs | Tri-state (3-state) driver outputs | Tri-state outputs allow bus sharing; the electrical behavior and drive strength differ between receiver and driver outputs. |
| Supply Voltage (Vcc) | 5 V (4.75 V to 5.25 V) | 5 V (4.75 V to 5.25 V) | Both operate from a standard 5 V rail, so power supply compatibility is maintained. |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | Industrial-grade parts support wider ambient conditions; substituting a commercial part into an industrial environment may violate thermal margins. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Identical package and footprint allow drop-in PCB compatibility, though pin functions differ. |
| Pin Count | 16 pins | 16 pins | Same pin count, but pin assignments differ between receiver and driver, so direct substitution is not possible. |
| Data Rate / Signaling | Up to 10 Mbps (RS-422/RS-485 receiver) | Up to 10 Mbps (RS-422 driver) | Both support comparable signaling rates, but only in their respective transmit or receive direction. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS32AIDR | AM26LS31CDG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Protocol | RS422, RS423 | RS422, RS485 |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Receiver Hysteresis | 50 mV | - |
Frequently asked questions
What are the primary functional differences between the AM26LS32AIDR and the AM26LS31CDG4?
The AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDG4 is a quad differential line driver. The AM26LS32AIDR is designed to receive balanced differential signals compliant with RS-422, RS-423, and RS-485 standards, whereas the AM26LS31CDG4 is designed to transmit balanced differential signals meeting RS-422 specifications.
Are the AM26LS32AIDR and AM26LS31CDG4 pin-compatible and can they be used as drop-in replacements for each other?
No. Although both devices are offered in 16-pin SOIC packages, they are not functionally interchangeable. The AM26LS32AIDR is a receiver with high-impedance inputs and tri-state outputs, while the AM26LS31CDG4 is a driver with differential outputs and an enable function. Pin functions and internal circuitry differ, so one cannot directly replace the other in a given circuit without redesign.
What are the supported data signaling standards for each device?
The AM26LS32AIDR receiver meets the requirements of RS-422, RS-423, and RS-485 (with respect to input common-mode range and sensitivity). The AM26LS31CDG4 driver meets the requirements of RS-422 and is also commonly used in RS-485 transmit paths where the driver specifications are compatible. Designers should verify the specific standard compliance against the respective manufacturer datasheet for the target application.
What are the operating temperature ranges for the AM26LS32AIDR and AM26LS31CDG4?
The AM26LS32AIDR is specified for the industrial temperature range of –40°C to +85°C. The AM26LS31CDG4 is specified for the commercial temperature range of 0°C to +70°C. This difference is important when selecting parts for industrial or outdoor environments.
What are the package and pin count options for these two devices?
Both the AM26LS32AIDR and the AM26LS31CDG4 are offered in a 16-pin SOIC (Small Outline Integrated Circuit) package. The AM26LS32AIDR is supplied in tape-and-reel form (suffix R), while the AM26LS31CDG4 is supplied in tube form (suffix G4). Package dimensions and PCB land patterns are compatible with standard 16-pin SOIC footprints, but the devices are not electrically interchangeable.
Can the AM26LS32AIDR and AM26LS31CDG4 be used together in a single communication link?
Yes. A typical RS-422 or RS-485 point-to-point or multidrop link uses a driver such as the AM26LS31CDG4 at the transmitting end and a receiver such as the AM26LS32AIDR at the receiving end. The driver converts single-ended logic signals to balanced differential signals, and the receiver converts the differential signals back to single-ended logic levels. This pairing is a common and valid configuration when the link parameters (common-mode range, termination, data rate) are respected.
What are the supply voltage requirements for the AM26LS32AIDR and AM26LS31CDG4?
Both devices operate from a single 5 V supply (nominal). The AM26LS32AIDR receiver is specified for a supply voltage of 5 V ±5% (4.75 V to 5.25 V). The AM26LS31CDG4 driver is also specified for a 5 V supply. Designers should consult the respective datasheets for exact supply voltage tolerances and quiescent current specifications.
What are the output enable and tri-state capabilities of each device?
The AM26LS32AIDR receiver features tri-state outputs controlled by a common enable pin, allowing the receiver outputs to be placed in a high-impedance state for bus sharing. The AM26LS31CDG4 driver features an output enable function that allows the differential outputs to be disabled (placed in a high-impedance state) for multiplexing or power-saving purposes. The enable logic polarity and control pin assignments differ between the two devices and should be verified in the datasheets.