Part A
AM26LS31CD
Texas Instruments
- Lifecycle
- Active
- Stock
- 2633 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26LS32AIDR and AM26LS31CD are not functionally interchangeable: the AM26LS32AIDR is a quad differential line receiver while the AM26LS31CD is a quad differential line driver, so their signal direction, I/O structure, and application roles differ fundamentally. Direct substitution is not possible without redesigning the interface around the opposite transmit/receive function.
Different signal direction
Receiver vs driver function
Different I/O structure
Not pin-function compatible
Parts at a glance
Part B
AM26LS32AIDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1798 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, 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 | AM26LS32AIDR | AM26LS31CD | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver vs. driver roles are not interchangeable; a receiver cannot transmit and a driver cannot receive, so they serve opposite ends of a differential link. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Defines the signal direction and channel count, which must match the system architecture for functional substitution. |
| Output Type | Tri-state (3-state) outputs | Tri-state (3-state) outputs | Tri-state capability allows bus sharing; both support it, but the electrical behavior differs between receiver and driver outputs. |
| Supply Voltage (Vcc) | 5 V nominal (4.75 V to 5.25 V) | 5 V nominal (4.75 V to 5.25 V) | Both operate from a standard 5 V rail, so power supply compatibility is maintained across the pair. |
| Operating Temperature Range | -40°C to +85°C (industrial) | 0°C to +70°C (commercial) | The wider industrial range of the receiver allows use in harsher environments where the commercial-grade driver may not be rated. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Matching package and footprint simplifies board-level replacement, though the two parts still differ functionally. |
| Standard Compliance | Meets RS-422, RS-423, and RS-485 receiver requirements | Meets RS-422 and RS-423 driver requirements | Standards compliance determines interoperability with other differential devices on the bus. |
| Input/Output Logic Family | TTL-compatible inputs, differential outputs | TTL-compatible inputs, differential outputs | TTL compatibility ensures direct interfacing with common logic, but the differential side differs (receiver input vs. driver output). |
| Typical Propagation Delay | ~20 ns (typical) | ~20 ns (typical) | Similar delay supports comparable timing budgets, though the parts cannot substitute for one another due to opposite signal roles. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS31CD | AM26LS32AIDR |
|---|---|---|
| Part Status | Active | Active |
| Type | Driver | Receiver |
| Protocol | RS422, RS485 | RS422, RS423 |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°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 AM26LS31CD?
The AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CD 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 AM26LS31CD is designed to transmit balanced differential signals meeting RS-422 and RS-423 requirements. They serve complementary roles in a differential communication link rather than being interchangeable.
Are the AM26LS32AIDR and AM26LS31CD 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 inputs, outputs, and enable pins configured for reception, while the AM26LS31CD is a driver with driver inputs and differential outputs. Pin functions differ, so substituting one for the other in an existing PCB design is not valid without redesigning the circuit around the correct device function.
What supply voltage do the AM26LS32AIDR and AM26LS31CD require?
Both devices operate from a single 5 V nominal supply. The AM26LS32AIDR is specified for operation over a 4.75 V to 5.25 V supply range, and the AM26LS31CD is likewise specified for 5 V operation. Designs should confirm the exact recommended operating conditions in the respective manufacturer datasheets before finalizing the power supply.
What are the differences in operating temperature range between the AM26LS32AIDR and AM26LS31CD?
The AM26LS32AIDR is specified for the industrial temperature range of -40 °C to +85 °C. The AM26LS31CD is specified for the commercial temperature range of 0 °C to +70 °C. Designs requiring extended temperature operation should account for this difference when selecting between the two devices.
Do the AM26LS32AIDR and AM26LS31CD support the same differential signaling standards?
They support overlapping but not identical standards. The AM26LS32AIDR receiver is designed for RS-422, RS-423, and RS-485 differential input signals. The AM26LS31CD driver is designed for RS-422 and RS-423 balanced differential output signals. A typical link uses the AM26LS31CD as the driver and the AM26LS32AIDR as the receiver, with the receiver capable of handling the differential levels produced by the driver.
What package options are available for the AM26LS32AIDR and AM26LS31CD?
The AM26LS32AIDR is supplied in a 16-pin SOIC package (the "D" suffix in the ordering code denotes SOIC). The AM26LS31CD is also supplied in a 16-pin SOIC package. Both are surface-mount devices, but designers must verify pin assignments and land patterns against the specific manufacturer datasheet because the pin functions differ between the receiver and driver.
Can the AM26LS32AIDR and AM26LS31CD be used together in a single differential communication link?
Yes. A common configuration uses the AM26LS31CD as the differential line driver at the transmitting end and the AM26LS32AIDR as the differential line receiver at the receiving end. This pairing is consistent with their respective roles in RS-422/RS-423 style balanced transmission, provided the system-level termination, cable characteristics, and supply conditions are designed according to the datasheets.
What are the output enable and input enable features of these devices?
The AM26LS32AIDR receiver includes output enable controls that allow the receiver outputs to be placed in a high-impedance state, facilitating bus sharing. The AM26LS31CD driver includes input enable controls that allow the driver outputs to be disabled, typically placing them in a high-impedance condition. These enable features support multi-drop and bus-oriented architectures, and exact logic polarity and enable behavior should be confirmed in the respective datasheets.