Part A
AM26C31ID
Texas Instruments
- Lifecycle
- Active
- Stock
- 7351 PCS
- Package
- SOIC-16
- Series
- Interfaces - pilotes, récepteurs, émetteurs - récepteurs
Replacement verdict
Compatible functional replacement candidate
The AM26C31ID and AM26C31CDG4 are functionally equivalent quad differential line drivers sharing the same RS-422/RS-485 interface family, logic function, and electrical characteristics; the AM26C31CDG4 is a Pb-free/RoHS-compliant SOIC variant of the same device, making it a viable functional replacement where package and environmental compliance align with the design requirements.
Logic Function
High match
Package Type
High match
Supply Voltage Range
High match
Environmental Compliance
Validation required
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 | AM26C31ID | AM26C31CDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line driver | Both devices perform the same core function, so they are functionally interchangeable in most designs. |
| Number of Drivers | 4 | 4 | The driver count determines how many differential lines each device can drive, affecting channel capacity in the system. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | The supply range must match the system rail to ensure reliable operation and compatibility with surrounding logic. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and proper termination in multi-driver systems. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | The maximum data rate determines whether the device meets the bandwidth requirements of the communication link. |
| Operating Temperature Range | -40 °C to 85 °C | -40 °C to 85 °C | The temperature range must cover the application environment to guarantee specified performance and reliability. |
| Package / Mounting | SOIC-16 (surface mount) | SOIC-16 (surface mount) | Package and mounting style must match the PCB footprint and assembly process for a drop-in replacement. |
| Qualification / Grade | Industrial grade | Commercial grade | The grade affects guaranteed temperature limits and screening, which matters for industrial versus commercial applications. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C31ID | AM26C31CDG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Driver |
| Number of Drivers/Receivers | 4/0 | 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 |
Frequently asked questions
What are the AM26C31ID and AM26C31CDG4?
Both are quadruple differential line drivers from Texas Instruments that meet the TIA/EIA-422-B and ITU-T V.11 standards. They are functionally identical devices; the difference lies in the ordering suffix, which denotes package, temperature grade, and shipping form.
What is the difference between the AM26C31ID and AM26C31CDG4?
The AM26C31ID is supplied in a 16-pin SOIC package (D suffix) and is specified over the industrial temperature range of -40°C to +85°C. The AM26C31CDG4 is supplied in a 16-pin SOIC package (D suffix) with the G4 lead-free/RoHS-compliant finish and is specified over the commercial temperature range of 0°C to +70°C.
Are the AM26C31ID and AM26C31CDG4 electrically interchangeable?
Yes. Both devices share the same functional block diagram, pinout, and electrical characteristics per the Texas Instruments datasheet. The primary differences are the operating temperature range and the lead-free finish designation, so substitution is possible when the target design's temperature range is satisfied.
What is the operating temperature range of each device?
The AM26C31ID is rated for -40°C to +85°C (industrial grade). The AM26C31CDG4 is rated for 0°C to +70°C (commercial grade). Designs exposed to sub-zero or elevated ambient conditions should use the industrial-grade AM26C31ID.
What package and pin count do these devices use?
Both the AM26C31ID and AM26C31CDG4 are offered in a 16-pin SOIC (D) package. Pin functions and the PCB land pattern are identical between the two orderable part numbers.
What are the key AC and DC specifications of the AM26C31 family?
Per the Texas Instruments datasheet, the AM26C31 family operates from a single 5 V supply, provides differential outputs meeting TIA/EIA-422-B, features a typical propagation delay of approximately 7 ns, and supports data rates up to 32 Mbps. Outputs are three-state capable via the enable pins.
Does the G4 suffix affect electrical performance?
No. The G4 suffix indicates a lead-free (RoHS-compliant) finish and does not alter the device's electrical specifications. Electrical performance is governed by the base part number and temperature grade.
Can the AM26C31CDG4 be used as a drop-in replacement for the AM26C31ID?
Electrically and mechanically yes, provided the application's ambient temperature stays within 0°C to +70°C. If the design requires operation below 0°C or above +70°C, the industrial-grade AM26C31ID must be retained.