Part A
AM26LV31IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3059 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26LV31IDR and AM26LS32ACDG4 are not functionally interchangeable: the AM26LV31IDR is a quad low-voltage differential line driver, while the AM26LS32ACDG4 is a quad differential line receiver. Their signal direction, supply voltage range, and I/O characteristics differ fundamentally, so substituting one for the other is not feasible without redesigning the interface.
Different device function
Different signal direction
Different supply voltage range
Different I/O characteristics
Parts at a glance
Part B
AM26LS32ACDG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 5692 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, 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 | AM26LV31IDR | AM26LS32ACDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line receiver | A driver and a receiver serve opposite roles in a differential link, so they are not direct substitutes for one another. |
| Logic Family / Standard | RS-422 (low-voltage) | RS-422 / RS-423 | The signaling standard determines compatibility with the rest of the bus and the allowable voltage levels. |
| Supply Voltage (Vcc) | 3.0 V to 3.6 V | 4.75 V to 5.25 V | Different supply rails mean the parts cannot share the same power domain without level shifting. |
| Number of Drivers | 4 | 0 | Driver count defines how many differential transmit channels are available on the device. |
| Number of Receivers | 0 | 4 | Receiver count defines how many differential receive channels are available on the device. |
| Output Type | Tri-state differential outputs | Tri-state outputs | Tri-state capability allows the outputs to be disabled for bus sharing, but the electrical nature of the outputs differs between driver and receiver. |
| Package | 16-SOIC | 16-SOIC | Package compatibility affects PCB footprint and assembly, though identical packages still require matching pin functions. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The wider industrial temperature range of the driver suits harsher environments than the commercial-grade receiver. |
| Mounting Type | Surface mount | Surface mount | Mounting style must match the board assembly process, though both parts share the same surface-mount approach. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LV31IDR | AM26LS32ACDG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Receiver |
| Protocol | RS422, RS485 | RS422, RS423 |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Receiver Hysteresis | - | 50 mV |
| Voltage - Supply | 3V ~ 3.6V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AM26LV31IDR and the AM26LS32ACDG4?
The AM26LV31IDR is a quad low-voltage differential line driver designed to meet TIA/EIA-422-B and ITU Recommendation V.11, operating from a single 3.3 V supply. The AM26LS32ACDG4 is a quad differential line receiver designed to meet TIA/EIA-422-B and TIA/EIA-423-B, operating from a single 5 V supply. In short, the AM26LV31IDR is a driver and the AM26LS32ACDG4 is a receiver, so they serve complementary but non-interchangeable roles in a differential transmission link.
Can the AM26LV31IDR and AM26LS32ACDG4 be used together in the same system?
Yes. Because the AM26LV31IDR is a differential line driver and the AM26LS32ACDG4 is a differential line receiver, they are commonly paired across a balanced transmission line. The driver converts single-ended logic inputs to differential outputs, and the receiver converts the differential signal back to single-ended logic levels. Designers should verify that the driver output levels and receiver input thresholds are compatible over the intended cable and termination conditions.
What are the supply voltage requirements for each device?
The AM26LV31IDR operates from a single 3.3 V nominal supply (typically 3.0 V to 3.6 V), consistent with its low-voltage design. The AM26LS32ACDG4 operates from a single 5 V nominal supply (typically 4.75 V to 5.25 V). Because the supply voltages differ, the two devices cannot share the same rail without level considerations, and each should be powered according to its manufacturer datasheet limits.
Do both devices use the same package and pinout?
Both devices are offered in a 16-pin SOIC package (the "D" suffix in both part numbers indicates SOIC). However, the pin functions differ because one is a driver and the other is a receiver. The AM26LV31IDR provides driver inputs, enable controls, and differential outputs, while the AM26LS32ACDG4 provides differential inputs and single-ended outputs. Pin-to-pin substitution is therefore not possible despite the shared package type.
What are the signaling standards supported by each part?
The AM26LV31IDR is designed to meet TIA/EIA-422-B and ITU Recommendation V.11 for balanced differential driver operation. The AM26LS32ACDG4 is designed to meet TIA/EIA-422-B and TIA/EIA-423-B for balanced and unbalanced differential receiver operation. Both are suited to industrial balanced transmission applications, but their roles (driver versus receiver) and supported standards differ.
Are the AM26LV31IDR and AM26LS32ACDG4 drop-in replacements for each other?
No. The AM26LV31IDR is a line driver and the AM26LS32ACDG4 is a line receiver, so they perform opposite functions and cannot replace one another. Even though both are 16-pin SOIC devices, their internal circuitry, pin functions, and supply voltages differ. Any substitution must be evaluated against the specific signal-chain role and the manufacturer datasheet.
What are typical applications for each device?
The AM26LV31IDR is typically used to drive balanced differential signals over twisted-pair or similar media in low-voltage systems, such as industrial control, motor drive, and data acquisition interfaces. The AM26LS32ACDG4 is typically used to receive balanced differential signals in 5 V systems, such as RS-422/RS-485-style links, industrial networking, and point-to-point data transmission. Each device is selected according to whether the design requires driving or receiving the differential line.