Part A
AM26C31CDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5213 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The AM26C31CDR and AM26C31QDRG4 are functionally equivalent quad differential line drivers sharing the same device core, logic function, and SOIC-16 package, making them a viable functional replacement candidate. The primary distinction lies in qualification and sourcing context rather than electrical or functional behavior, so validation against the target application's qualification and supply-chain requirements is recommended before substitution.
Logic Function
High match
Package Type
High match
Supply Voltage Range
High match
Qualification Grade
Validation required
Parts at a glance
Part B
AM26C31QDRG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 3462 PCS
- 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 | AM26C31CDR | AM26C31QDRG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line driver | Both parts perform the same core function, so they are functionally interchangeable in the signal-driving role. |
| Number of Drivers | 4 | 4 | Matching driver count ensures the same number of differential channels are available in the circuit. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Identical supply range means the parts can be used in the same 5 V system without power redesign. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and are essential for multipoint or shared-bus topologies. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Same maximum data rate confirms equivalent throughput capability for the target interface. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and mounting allow drop-in PCB replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the QDRG4 variant suits harsher environments, while both cover standard industrial use. |
| Qualification / Grade | Commercial/industrial grade | Automotive-qualified (Q-grade) | The automotive-qualified variant meets stricter reliability and qualification standards, which matters for automotive and high-reliability designs. |
| RoHS Compliance | RoHS compliant | RoHS compliant | Both meet RoHS requirements, so environmental compliance is not a differentiator between the two parts. |
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 | AM26C31CDR | AM26C31QDRG4 |
|---|---|---|
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Driver |
| Number of Drivers / Receivers | - | 4/0 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | AM26C31 |
| Number of Drivers/Receivers | 4/0 | - |
Frequently asked questions
What are the AM26C31CDR and AM26C31QDRG4?
Both are quadruple differential line drivers from Texas Instruments, part of the AM26C31 family. They are designed to meet the requirements of TIA/EIA-422-B and ITU Recommendation V.11, and are used to drive balanced transmission lines in digital data transmission systems.
What is the difference between the AM26C31CDR and AM26C31QDRG4?
The primary difference is the package and qualification grade. The AM26C31CDR is supplied in a standard SOIC-16 (D) package with a commercial temperature range of 0°C to 70°C. The AM26C31QDRG4 is supplied in the same SOIC-16 package but is qualified for the automotive temperature range of -40°C to 125°C and is designated with the Q (automotive) and G4 (green/RoHS) suffixes.
Are the AM26C31CDR and AM26C31QDRG4 pin-compatible?
Yes. Both devices use the same 16-pin SOIC (D) package with identical pin assignments, so they are pin-compatible and share the same PCB land pattern.
Can the AM26C31CDR be replaced by the AM26C31QDRG4 in an existing design?
Functionally, yes, since both are quadruple differential line drivers with the same pinout and electrical characteristics. However, the AM26C31QDRG4 is rated for the wider automotive temperature range of -40°C to 125°C, so the replacement is valid only if the target design's operating conditions and qualification requirements are met.
What are the key electrical specifications shared by both devices?
Both devices operate from a single 5 V supply, feature a typical propagation delay of about 7 ns, and provide a differential output voltage suitable for TIA/EIA-422-B balanced transmission. They also include a common enable function and are designed for low power consumption.
What temperature ranges do the two parts support?
The AM26C31CDR is specified for the commercial temperature range of 0°C to 70°C. The AM26C31QDRG4 is specified for the automotive temperature range of -40°C to 125°C, making it suitable for harsher environments.
What does the G4 suffix on the AM26C31QDRG4 indicate?
The G4 suffix indicates that the device is supplied in a green (RoHS-compliant, lead-free) package, consistent with Texas Instruments' environmental packaging designation.
Which applications are these line drivers typically used in?
Both parts are commonly used in balanced digital data transmission over twisted-pair or parallel-wire cables, including RS-422 interfaces, industrial control systems, and point-to-point data links. The AM26C31QDRG4 is additionally suited to automotive and other wide-temperature applications.