Part A
AM26C32CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2477 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32CDR and AM26C31CDRG4 are complementary rather than interchangeable devices: the AM26C32CDR is a quad differential line receiver, while the AM26C31CDRG4 is a quad differential line driver. Their signal direction, I/O function, and internal architecture differ fundamentally, so one cannot directly substitute for the other in a given socket without redesigning the interface.
Different signal direction
Different I/O function
Different internal architecture
Not pin-function compatible
Parts at a glance
Part B
AM26C31CDRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7066 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 | AM26C31CDRG4 | 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 | 0 | 4 | The driver count determines whether the device can actively transmit differential signals onto a bus. |
| Number of Receivers | 4 | 0 | The receiver count determines whether the device can accept and convert differential bus signals to logic levels. |
| Output Type | Tri-state (3-state) receiver outputs | Tri-state (3-state) differential driver outputs | Tri-state capability allows outputs to be disabled and shared on a common bus, but the electrical nature of the outputs differs between receiver and driver. |
| 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 the same 5 V logic supply, so power rail compatibility is maintained. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rates indicate comparable signaling speed capability for RS-422/RS-485 style links. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and mounting allow drop-in board footprint compatibility, though electrical function still differs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure both parts suit the same industrial ambient conditions. |
| Standard Compliance | Meets RS-422 / RS-485 receiver requirements | Meets RS-422 / RS-485 driver requirements | Both target the same differential bus standards, but each fulfills only one side of the link (receive vs transmit). |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32CDR | AM26C31CDRG4 |
|---|---|---|
| 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 the AM26C31CDRG4?
The AM26C32CDR is a quad differential line receiver, while the AM26C31CDRG4 is a quad differential line driver. The AM26C32CDR receives differential signals and converts them to TTL-compatible outputs, whereas the AM26C31CDRG4 accepts TTL inputs and drives differential outputs compliant with RS-422 and RS-485 signaling requirements.
Are the AM26C32CDR and AM26C31CDRG4 pin-compatible and can they be used as drop-in replacements for each other?
No. Although both devices are offered in the same 16-pin SOIC package (D suffix), they are not functionally interchangeable. The AM26C32CDR is a receiver with high-impedance differential inputs and tri-state TTL outputs, while the AM26C31CDRG4 is a driver with TTL inputs and differential outputs. Pin functions differ, so one cannot directly replace the other on the same PCB without redesign.
What supply voltage do the AM26C32CDR and AM26C31CDRG4 require?
Both devices operate from a single 5 V nominal supply. The AM26C32CDR is specified for a supply range of 4.5 V to 5.5 V, and the AM26C31CDRG4 is likewise specified for 4.5 V to 5.5 V operation, consistent with their TTL-compatible logic interfaces.
Do the AM26C32CDR and AM26C31CDRG4 support tri-state outputs?
Yes. The AM26C32CDR receiver provides tri-state outputs controlled by an enable pin, allowing the outputs to be placed in a high-impedance state. The AM26C31CDRG4 driver also features tri-state differential outputs controlled by an enable input, permitting the driver outputs to be disabled and placed in a high-impedance condition.
What data rate and signaling standards do these devices support?
The AM26C32CDR and AM26C31CDRG4 are designed for balanced differential data transmission and are commonly used in RS-422 and RS-485 applications. Both are specified for operation at data rates up to 10 Mbps, making them suitable for moderate-speed differential serial communication links.
What is the significance of the "G4" suffix on the AM26C31CDRG4 compared to the AM26C32CDR?
The "G4" suffix denotes a green/RoHS-compliant package variant per Texas Instruments' ordering nomenclature. The AM26C31CDRG4 is the RoHS-compliant version of the AM26C31CDR. The AM26C32CDR is the standard receiver part number; its RoHS-compliant variant would carry a similar suffix. The G4 designation does not change the electrical function of the device.
Can the AM26C31CDRG4 driver and AM26C32CDR receiver be used together in the same RS-422/RS-485 system?
Yes. The AM26C31CDRG4 quad differential driver and the AM26C32CDR quad differential receiver are complementary devices designed to interoperate in balanced differential transmission systems. A typical configuration uses the driver at the transmitting end and the receiver at the receiving end of an RS-422 or RS-485 link, provided the system-level termination and common-mode requirements are satisfied.
What are the operating temperature ranges for the AM26C32CDR and AM26C31CDRG4?
Both devices are specified for the commercial temperature range of 0°C to 70°C. This is consistent with the "C" designation in their part numbers, indicating commercial-grade operating conditions.