Part A
AM26C32CDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 2477 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32CDR and AM26C31CDG4 are complementary quad differential bus devices with opposite signal directions: the AM26C32CDR is a quad differential line receiver, while the AM26C31CDG4 is a quad differential line driver. Because their core functions are inverted, neither device can directly substitute for the other in a given circuit position, and any redesign would require reworking the signal path, termination, and control logic rather than a simple part swap.
Different device function
Different signal direction
Different input/output topology
Different application role
Parts at a glance
Part B
AM26C31CDG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6972 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 | AM26C32CDR | AM26C31CDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver serve opposite roles in a differential link; they are not direct substitutes for the same socket function. |
| Number of Drivers | 0 | 4 | The driver count determines whether the device can transmit differential signals onto a bus. |
| Number of Receivers | 4 | 0 | The receiver count determines whether the device can accept differential signals from a bus. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) differential driver outputs | Tri-state capability allows outputs to be disabled for bus sharing, but the electrical nature of the outputs differs between receiver and driver. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained even though the signal direction differs. |
| Package | SOIC-16 (D) | SOIC-16 (D) | Matching package and pin count allows board-level footprint compatibility, though pin functions differ. |
| Operating Temperature Range | 0°C to 70°C | 0°C to 70°C | Identical commercial temperature ratings mean environmental constraints are the same for both parts. |
| Data Rate / Signaling Standard | RS-422 / RS-485 compatible receiver | RS-422 / RS-485 compatible driver | Both target the same differential signaling standards, but one is the transmit side and the other the receive side of the link. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32CDR | 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 | 0°C ~ 70°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 AM26C32CDR and AM26C31CDG4?
The AM26C32CDR is a quad differential line receiver, while the AM26C31CDG4 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 and RS-485 standards.
Are the AM26C32CDR and AM26C31CDG4 pin-compatible and can they be used as drop-in replacements for each other?
No. Although both are 16-pin devices, they serve opposite signal-flow functions (receiver vs. driver) and have different pin functions. The AM26C32CDR cannot replace the AM26C31CDG4 in a design without accounting for the reversed signal direction and associated pinout differences.
What package types do the AM26C32CDR and AM26C31CDG4 use?
The AM26C32CDR is supplied in a 16-pin SOIC package (the "D" suffix in the orderable part number indicates SOIC, and "R" indicates tape-and-reel packaging). The AM26C31CDG4 is supplied in a 16-pin SOIC package as well, with the "G4" suffix denoting lead-free/RoHS-compliant Green material.
Do both devices support the same supply voltage range?
Yes. Both the AM26C32CDR receiver and the AM26C31CDG4 driver are specified for a single 5 V nominal supply, with the datasheet operating range typically covering 4.5 V to 5.5 V. Designers should confirm the exact limits in the respective manufacturer datasheets for the specific grade.
Can the AM26C32CDR and AM26C31CDG4 be used together in the same RS-422/RS-485 communication link?
Yes. Because one is a line driver and the other is a line receiver, they are complementary and are commonly paired in full-duplex or multi-drop RS-422/RS-485 systems, with the AM26C31CDG4 transmitting differential signals and the AM26C32CDR receiving them at the other end of the bus.
What are the key electrical characteristics of the AM26C31CDG4 driver?
The AM26C31CDG4 is a quad differential line driver designed for digital data transmission over balanced lines, meeting RS-422 requirements. It features 3-state outputs, a wide common-mode output voltage range, and is specified for operation over the standard industrial temperature range. Exact output swing, propagation delay, and current limits should be taken from the manufacturer datasheet.
What are the key electrical characteristics of the AM26C32CDR receiver?
The AM26C32CDR is a quad differential line receiver designed to meet RS-422 and RS-485 requirements, featuring a wide common-mode input voltage range, high input impedance, and TTL-compatible outputs. It includes a fail-safe feature that ensures a high output state when inputs are open or undriven. Precise thresholds and timing parameters should be verified in the manufacturer datasheet.
Are both parts RoHS-compliant and lead-free?
The AM26C31CDG4 carries the "G4" suffix, which in Texas Instruments nomenclature denotes Green (lead-free/RoHS-compliant) material. The AM26C32CDR is also available in RoHS-compliant versions; however, the specific compliance status should be confirmed against the exact orderable part number and the manufacturer's product compliance documentation.