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 AM26LS31CD and AM26LS32ACDR are not functionally interchangeable: the AM26LS31CD is a quad differential line driver, while the AM26LS32ACDR is a quad differential line receiver. Although both devices share the same quad differential signaling family, SOIC-16 package, and 5 V nominal supply, their opposing signal-flow roles, different output structures, and distinct input/output characteristics make direct substitution impossible without redesigning the surrounding interface circuitry.
Different signal direction
Different output type
Different input structure
Different interface role
Parts at a glance
Part B
AM26LS32ACDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2449 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 | AM26LS31CD | AM26LS32ACDR | Why it matters |
|---|---|---|---|
| Function | Quad differential line driver | Quad differential line receiver | A driver and a receiver serve opposite roles in a differential link, so they are not direct substitutes; they are typically used as a complementary pair. |
| Number of Drivers | 4 | 0 | The driver count determines how many differential output channels are available for transmitting signals. |
| Number of Receivers | 0 | 4 | The receiver count determines how many differential input channels can be accepted and converted to logic levels. |
| Output Type | Tri-state differential | Tri-state (3-state) logic output | Tri-state outputs allow multiple devices to share a bus; the driver outputs differential signals while the receiver outputs single-ended logic. |
| Supply Voltage Range | 4.75 V to 5.25 V | 4.75 V to 5.25 V | Both operate from a standard 5 V supply, so power-rail compatibility is maintained in mixed driver/receiver designs. |
| Operating Temperature Range | 0°C to 70°C | 0°C to 70°C | Commercial temperature range suitability must match the target application environment for reliable operation. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Matching package and footprint simplifies PCB layout and allows drop-in placement in the same board location. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | The maximum signaling rate must support the intended bus speed for the application. |
| Input/Output Compatibility Standard | RS-422 / RS-485 compatible driver | RS-422 / RS-485 compatible receiver | Compatibility with RS-422/RS-485 signaling standards ensures interoperability with other bus transceivers in the system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS31CD | AM26LS32ACDR |
|---|---|---|
| Part Status | Active | Active |
| Type | Driver | Receiver |
| Protocol | RS422, RS485 | RS422, RS423 |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Receiver Hysteresis | - | 50 mV |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AM26LS31CD and the AM26LS32ACDR?
The AM26LS31CD is a quad differential line driver designed to meet the requirements of RS-422 and RS-485, while the AM26LS32ACDR is a quad differential line receiver intended for RS-422, RS-423, and RS-485 applications. In short, the AM26LS31CD transmits differential signals, whereas the AM26LS32ACDR receives them.
Are the AM26LS31CD and AM26LS32ACDR 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 AM26LS31CD is a driver with enable and tri-state control pins, while the AM26LS32ACDR is a receiver with a high-impedance input structure and a common receiver enable. Pin functions and internal circuitry differ, so one cannot directly replace the other in a design.
What supply voltage do the AM26LS31CD and AM26LS32ACDR require?
Both devices operate from a single 5 V nominal supply. The AM26LS31CD is specified for a supply voltage range of 4.75 V to 5.25 V, and the AM26LS32ACDR is specified over the same 4.75 V to 5.25 V range, consistent with standard TTL-compatible 5 V logic systems.
What are the key AC switching characteristics of the AM26LS31CD driver?
The AM26LS31CD features typical propagation delay times on the order of tens of nanoseconds and supports data rates suitable for RS-422/RS-485 signaling. Its outputs are designed to drive balanced twisted-pair lines with controlled rise and fall times, and the device includes output enable and tri-state control for bus multiplexing.
What input sensitivity and common-mode range does the AM26LS32ACDR receiver support?
The AM26LS32ACDR is designed for differential input sensitivity of ±200 mV over a common-mode voltage range of −7 V to +7 V, which is the standard RS-422/RS-485 receiver specification. This wide common-mode range allows reliable reception in the presence of ground potential differences between nodes.
What package options are available for the AM26LS31CD and AM26LS32ACDR?
The AM26LS31CD is commonly supplied in a 16-pin SOIC (D) package, and the AM26LS32ACDR is supplied in a 16-pin SOIC (D) package in tape-and-reel form (the "R" suffix denotes reel packaging). Both are surface-mount SOIC-16 devices, but their pin functions differ as noted above.
Can the AM26LS31CD and AM26LS32ACDR be used together in a single RS-422/RS-485 link?
Yes. A typical point-to-point or multidrop link uses the AM26LS31CD as the differential driver at the transmitting end and the AM26LS32ACDR as the differential receiver at the receiving end. Because both comply with RS-422/RS-485 electrical specifications, they are commonly paired in balanced transmission systems.
What are the operating temperature ranges for the AM26LS31CD and AM26LS32ACDR?
Both devices are specified for commercial temperature operation, typically 0 °C to 70 °C. Designers requiring extended or industrial temperature ranges should consult the manufacturer datasheet for the appropriate grade suffix, as the "C" suffix denotes the commercial temperature range.