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 AM26LS31CDRE4 are not functionally interchangeable: the AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDRE4 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 feasible in a given circuit design.
Different device function
Different signal direction
Different I/O architecture
Different application role
Parts at a glance
Part B
AM26LS31CDRE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 2303 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 | AM26LS31CDRE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver and driver are complementary but non-interchangeable functions; a receiver cannot replace a driver in a transmission link. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines the direction of signal flow and whether the device can source or accept differential signals on a bus. |
| Output Type | Tri-state differential receiver outputs | Tri-state differential driver outputs | Tri-state capability allows bus sharing; the output type defines the electrical interface presented to the transmission line. |
| Input Type | Differential line receiver inputs | TTL-compatible single-ended driver inputs | Input compatibility dictates what upstream logic or bus signals the device can accept. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a standard 5 V rail, so power supply requirements are compatible. |
| 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-pin SOIC (surface mount) | 16-pin SOIC (surface mount) | Identical package and footprint simplify PCB layout and potential board-level substitution. |
| Standard Compliance | Meets RS-422 / RS-423 / RS-485 receiver requirements | Meets RS-422 / RS-423 driver requirements | Standards compliance confirms interoperability with the intended differential serial interface families. |
| Data Rate Capability | Up to approximately 10 Mbps | Up to approximately 10 Mbps | Matching data-rate capability ensures the link can support the same signaling speeds regardless of which side is populated. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS32AIDR | AM26LS31CDRE4 |
|---|---|---|
| Supplier | - | 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 AM26LS31CDRE4?
The AM26LS32AIDR is a quad differential line receiver, while the AM26LS31CDRE4 is a quad differential line driver. They perform complementary functions in RS-422/RS-485 communication systems: the '32A receives differential signals, and the '31C drives differential signals onto a bus.
Are the AM26LS32AIDR and AM26LS31CDRE4 pin-compatible?
Both devices are offered in a 16-pin SOIC package (D suffix). However, pin compatibility must be verified against the respective datasheets because the receiver and driver have different pin functions (e.g., enable inputs and output/input assignments). They are not interchangeable on the same PCB footprint without design review.
What supply voltage do the AM26LS32AIDR and AM26LS31CDRE4 require?
Both devices operate from a single 5 V nominal supply. The AM26LS32AIDR receiver is specified for 5 V operation, and the AM26LS31CDRE4 driver is also specified for 5 V operation, consistent with standard RS-422/RS-485 signaling levels.
Do both parts support the same data rates?
Data rate capability differs by function and is specified in the respective datasheets. The AM26LS31CDRE4 driver is typically characterized for signaling rates up to 10 Mbps, while the AM26LS32AIDR receiver is characterized for comparable RS-422/RS-485 rates. Designers should confirm the exact switching characteristics from the manufacturer datasheets for the target application.
What is the difference in input/output characteristics between the receiver and driver?
The AM26LS32AIDR receiver features high input impedance and differential input thresholds with built-in hysteresis for noise immunity, and provides TTL-compatible outputs. The AM26LS31CDRE4 driver provides differential outputs with tri-state capability and is designed to drive terminated twisted-pair lines. These characteristics are complementary and not interchangeable.
Can the AM26LS32AIDR and AM26LS31CDRE4 be used together in the same system?
Yes. A common configuration uses the AM26LS31CDRE4 as the line driver at the transmitting end and the AM26LS32AIDR as the line receiver at the receiving end of a balanced differential bus, forming a complete RS-422/RS-485 interface link.
What are the operating temperature ranges for these devices?
The AM26LS32AIDR is specified over the industrial temperature range of -40°C to +85°C. The AM26LS31CDRE4 is specified over the commercial temperature range of 0°C to +70°C. This difference should be considered when selecting parts for industrial versus commercial environments.
Do both devices include enable or tri-state control features?
Yes. The AM26LS32AIDR receiver includes active-high and active-low enable inputs to control the outputs. The AM26LS31CDRE4 driver includes an enable input that places the differential outputs in a high-impedance state, allowing bus sharing. The exact enable logic and pin assignments should be confirmed from the datasheets.