Part A
AM26C32IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6435 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31CDG4 are complementary quad differential bus transceivers from the same RS-422/RS-485 family, but they serve opposite signal-flow roles: the AM26C32IDR is a quad differential line receiver, while the AM26C31CDG4 is a quad differential line driver. Because their direction of data flow, input/output architecture, and enable logic differ fundamentally, they cannot be substituted for one another in a given socket. Designers should treat them as paired devices within a bus interface rather than interchangeable parts.
Different signal direction
Receiver vs driver function
Different input/output architecture
Different enable logic
Parts at a glance
Part B
AM26C31CDG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 6972 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 | AM26C32IDR | AM26C31CDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver vs driver roles are complementary, not interchangeable; a receiver cannot replace a driver in a transmit path. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines signal direction; the two parts serve opposite ends of a differential link. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) driver outputs | Tri-state capability enables bus sharing, but the electrical behavior differs between receiver and driver outputs. |
| Supply Voltage (VCC) | 5 V nominal (4.5 V to 5.5 V) | 5 V nominal (4.5 V to 5.5 V) | Both operate from a standard 5 V rail, so power supply compatibility is maintained. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rates allow both parts to support the same RS-422/RS-485 signaling speeds. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Identical package and footprint simplify board layout and physical substitution considerations. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range ensures comparable environmental robustness. |
| Protocol Compatibility | RS-422 / RS-485 receiver | RS-422 / RS-485 driver | Both target the same differential bus standards but occupy opposite roles in the transceiver pair. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32IDR | AM26C31CDG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Protocol | RS422, RS423 | - |
| Receiver Hysteresis | 60 mV | - |
Frequently asked questions
What are the primary functional differences between the AM26C32IDR and the AM26C31CDG4?
The AM26C32IDR is a quad differential line receiver, while the AM26C31CDG4 is a quad differential line driver. The AM26C32IDR converts differential input signals to TTL/CMOS logic outputs, whereas the AM26C31CDG4 converts TTL/CMOS logic inputs to differential outputs compliant with RS-422 and RS-485 signaling standards.
Are the AM26C32IDR and AM26C31CDG4 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 AM26C32IDR is a receiver and the AM26C31CDG4 is a driver; their pin functions and internal circuitry differ, so one cannot directly replace the other in a circuit without redesigning the signal path.
What are the supply voltage and operating temperature specifications for these devices?
Both the AM26C32IDR and AM26C31CDG4 operate from a single 5 V nominal supply (typically 4.5 V to 5.5 V). The AM26C32IDR is specified over the industrial temperature range of –40 °C to +85 °C, and the AM26C31CDG4 is specified over the commercial temperature range of 0 °C to +70 °C.
Do these devices support RS-422 and RS-485 communication standards?
Yes. The AM26C31CDG4 differential driver is designed for RS-422 and RS-485 balanced transmission, and the AM26C32IDR differential receiver is designed to receive RS-422 and RS-485 signals. They are commonly paired in a system where the driver transmits and the receiver accepts the differential data.
What are the package and pin count options for the AM26C32IDR and AM26C31CDG4?
Both devices are available in a 16-pin SOIC package (the "D" suffix in the part numbers). The AM26C32IDR is supplied in a 16-pin SOIC with tape-and-reel packaging, and the AM26C31CDG4 is supplied in a 16-pin SOIC in tube packaging.
Can the AM26C32IDR and AM26C31CDG4 be used together in the same RS-485 network?
Yes. A typical full-duplex or half-duplex RS-485/RS-422 link uses the AM26C31CDG4 as the line driver at the transmitting end and the AM26C32IDR as the line receiver at the receiving end. Their complementary driver/receiver functions make them suitable for paired use in balanced differential data transmission systems.
What are the key electrical characteristics of the AM26C31CDG4 driver?
The AM26C31CDG4 is a quad differential line driver with three-state outputs, designed for balanced transmission. It provides differential output voltage suitable for RS-422/RS-485 signaling and operates from a single 5 V supply. It is specified for commercial temperature operation (0 °C to +70 °C).
What are the key electrical characteristics of the AM26C32IDR receiver?
The AM26C32IDR is a quad differential line receiver with a wide common-mode input range, designed to accept RS-422/RS-485 differential signals and provide TTL/CMOS-compatible outputs. It operates from a single 5 V supply and is specified over the industrial temperature range of –40 °C to +85 °C.