Part A
AM26LS31CDR
德州儀器
- Lifecycle
- Active
- Stock
- 7571 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Not a drop-in replacement
The AM26LS32AIDR and AM26LS31CDR are not interchangeable: the AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDR is a quad differential line driver. Their signal direction, I/O function, and internal architecture differ fundamentally, so neither part can directly substitute for the other in a given socket without redesigning the interface.
Different device function
Different signal direction
Different I/O architecture
Not pin-function compatible
Parts at a glance
Part B
AM26LS32AIDR
德州儀器
- Lifecycle
- Active
- Stock
- 1798 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
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 | AM26LS31CDR | 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. |
| Device type | Receiver | Driver | Determines signal flow direction in the system and whether the part can be substituted at all in a given socket. |
| Number of drivers | 0 | 4 | A driver count of zero means the receiver part cannot generate differential outputs, so it cannot replace a driver in transmit paths. |
| Number of receivers | 4 | 0 | Receiver count defines how many differential input channels can be sensed; the driver part has none, so it cannot replace a receiver. |
| Output type | Tri-state (3-state) outputs | Tri-state (3-state) outputs | Tri-state capability allows bus sharing; both parts offer it, but the electrical nature of the outputs (receiver logic vs differential driver) still differs. |
| 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, though the functional role still differs. |
| Operating temperature range | -40°C to +85°C | 0°C to +70°C | The receiver supports industrial temperature range while the driver is commercial-grade, affecting suitability in harsh environments. |
| Package / mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Identical package and pin count allow board-level footprint compatibility, but pin functions differ between receiver and driver. |
| Standard compliance | Meets RS-422, RS-423, and RS-485 requirements | Meets RS-422 and RS-423 requirements | The receiver covers RS-485 in addition to RS-422/423, while the driver is specified for RS-422/423, affecting protocol compatibility. |
| Input hysteresis | Typically 50 mV | Not applicable (driver) | Input hysteresis improves noise immunity on received signals; a driver has no receiver input stage, so this spec does not apply. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS31CDR | 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 AM26LS31CDR?
The AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDR is a quad differential line driver. The receiver converts differential input signals to TTL-compatible outputs, whereas the driver converts TTL inputs to differential outputs compliant with RS-422/RS-485 signaling.
Are the AM26LS32AIDR and AM26LS31CDR 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, they are not functionally interchangeable. The AM26LS32AIDR is a receiver and the AM26LS31CDR is a driver; their pin functions and internal circuitry differ, so one cannot directly replace the other in a given circuit.
What are the supply voltage and operating temperature specifications for these devices?
Both the AM26LS32AIDR and AM26LS31CDR operate from a single 5 V nominal supply. The AM26LS32AIDR is specified over the industrial temperature range of -40 °C to +85 °C, while the AM26LS31CDR is specified over the commercial temperature range of 0 °C to +70 °C.
Do the AM26LS32AIDR and AM26LS31CDR support the same signaling standards?
Yes. Both devices are designed for balanced differential signaling compliant with RS-422 and RS-485 standards. The AM26LS32AIDR receiver accepts differential inputs within the common-mode range specified in its datasheet, and the AM26LS31CDR driver produces differential outputs meeting the required RS-422/RS-485 voltage levels.
Can the AM26LS32AIDR and AM26LS31CDR be used together in a full-duplex communication link?
Yes. A common configuration pairs the AM26LS31CDR driver at the transmitting end with the AM26LS32AIDR receiver at the receiving end to form a balanced differential data link. For full-duplex operation, one driver/receiver pair is used per direction, with proper termination and common-mode considerations applied per the datasheets.
What are the package and pin count options for the AM26LS32AIDR and AM26LS31CDR?
Both devices are available in a 16-pin SOIC package (the "D" suffix in the orderable part number). The AM26LS32AIDR and AM26LS31CDR are both specified in this 16-pin SOIC package, which is the package indicated by the "D" in their respective part numbers.
Do these devices include fail-safe or tri-state features?
The AM26LS32AIDR receiver includes a fail-safe feature that ensures a known high output state when the differential inputs are open or undriven, as specified in its datasheet. The AM26LS31CDR driver includes a tri-state enable function that allows the differential outputs to be placed in a high-impedance state for bus sharing. Refer to the respective datasheets for exact enable and fail-safe conditions.