Part A
AM26C31QDR
德州儀器
- Lifecycle
- Active
- Stock
- 1424 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The AM26C31QDR and AM26C31IDRG4 are functionally equivalent quad differential line drivers from the same AM26C31 family, sharing identical logic function, channel count, package footprint, and supply voltage range. The primary distinction lies in their operating temperature grades and qualification screening, so the AM26C31IDRG4 can serve as a functional substitute for the AM26C31QDR in most applications, provided the target design's thermal and qualification requirements are validated against the industrial-grade specification.
Logic Function and Output Type
High match
Package Type and Pinout
High match
Supply Voltage Range
High match
Operating Temperature Grade
Validation required
Parts at a glance
Part B
AM26C31IDRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4493 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM26C31QDR | AM26C31IDRG4 | 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 RS-422/RS-485 driver applications. |
| Number of Drivers | 4 | 4 | Matching driver count ensures the same number of differential channels are available for the bus interface. |
| Supply Voltage (Typical) | 5 V | 5 V | Both operate from the same nominal 5 V supply, so no power rail redesign is required when substituting. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and match the signaling requirements of the target interface. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Identical maximum data rate confirms both parts support the same bus throughput requirements. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Same package and mounting style means the parts are drop-in compatible on the same PCB footprint. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the QDR variant suits harsher environments, while the IDRG4 is limited to standard industrial conditions. |
| Qualification / Grade | Automotive qualified (Q-grade) | Industrial grade | The automotive-qualified part meets stricter reliability and testing standards, which matters for automotive and high-reliability designs. |
| RoHS Compliance | RoHS compliant | RoHS compliant (G4 suffix) | Both are lead-free/RoHS compliant, satisfying environmental and regulatory requirements for the assembly. |
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 | AM26C31QDR | AM26C31IDRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | - | Driver |
| Number of Drivers/Receivers | - | 4/0 |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the AM26C31QDR and AM26C31IDRG4?
Both are quad differential line drivers from Texas Instruments that implement the RS-422/RS-485 physical layer. They provide four independent drivers with three-state outputs and are designed for balanced transmission over twisted-pair media.
What is the difference between the AM26C31QDR and AM26C31IDRG4?
The primary difference is the operating temperature range and qualification grade. The AM26C31QDR is specified for the automotive/industrial Q-grade temperature range of -40°C to +125°C, while the AM26C31IDRG4 is specified for the industrial I-grade range of -40°C to +85°C. Both are supplied in the same SOIC-16 (D) package and are RoHS-compliant (G4 suffix).
Are the AM26C31QDR and AM26C31IDRG4 pin-compatible?
Yes. Both devices are offered in 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 AM26C31QDR and AM26C31IDRG4 be used interchangeably?
They are functionally equivalent quad RS-422/RS-485 drivers, so substitution is generally possible when the application's ambient temperature stays within the -40°C to +85°C range of the I-grade device. For operation above +85°C up to +125°C, only the Q-grade AM26C31QDR is specified.
What are the key electrical specifications common to both devices?
Both devices operate from a single 5 V supply, feature three-state outputs, and are designed for balanced differential transmission. They meet RS-422 requirements and are commonly used for driving twisted-pair lines in industrial and automotive communication interfaces.
What does the G4 suffix on the AM26C31IDRG4 indicate?
The G4 suffix denotes RoHS-compliant (lead-free/green) packaging per Texas Instruments' ordering convention. The AM26C31QDR is likewise supplied in RoHS-compliant packaging.
What does the DR suffix mean on both part numbers?
The DR suffix indicates tape-and-reel packaging in the SOIC-16 (D) package, suitable for automated surface-mount assembly.
Which device should be selected for automotive or high-temperature applications?
The AM26C31QDR should be selected for applications requiring operation up to +125°C, since its Q-grade temperature specification covers the extended range. The AM26C31IDRG4 is limited to +85°C and is intended for standard industrial environments.