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 AM26C31IDG4 are functionally equivalent quad differential line drivers sharing the same logic family, channel count, supply voltage range, and SOIC-16 footprint, making them viable substitutes in most designs. The primary distinction lies in their qualification grades and operating temperature ranges, so the AM26C31IDG4 should be selected where the wider industrial temperature envelope is required, while the AM26C31QDR remains suitable for standard commercial applications.
Function and Logic Family
High match
Channel Count
High match
Package Type
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AM26C31IDG4
德州儀器
- Lifecycle
- Active
- Stock
- 9629 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 | AM26C31IDG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line driver | Quadruple differential line driver | Both devices must perform the same core function to be functionally substitutable. |
| Number of Drivers | 4 | 4 | The driver count determines how many differential channels are available in the system. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | The operating supply range must match the system rail to ensure proper operation. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and are essential for multipoint applications. |
| Data Rate | 32 Mbps | 32 Mbps | The maximum data rate must meet the signaling speed requirements of the interface. |
| Operating Temperature Range | -40 °C to 125 °C | -40 °C to 85 °C | The temperature range affects suitability for industrial or extended-temperature environments. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Package and mounting style must match the PCB footprint for drop-in replacement. |
| Qualification / Grade | Automotive qualified (Q-grade) | Industrial grade | Qualification grade determines compliance with automotive or industrial reliability standards. |
| RoHS Compliance | RoHS compliant | RoHS compliant | RoHS compliance is required for many markets and environmental regulations. |
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 | AM26C31IDG4 |
|---|---|---|
| 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 AM26C31IDG4?
Both are quad differential line drivers from Texas Instruments that implement the RS-422/RS-485 electrical interface. They are functionally identical devices, differing only in package, temperature grade, and ordering suffix.
What is the difference between the AM26C31QDR and AM26C31IDG4?
The AM26C31QDR is supplied in a 16-pin SOIC package (D suffix) on tape and reel (R suffix) and is specified for the automotive/industrial temperature range of -40°C to +125°C (Q grade). The AM26C31IDG4 is supplied in a 16-pin SOIC package (D suffix) in tube form (G4 lead-free/RoHS suffix) and is specified for the industrial temperature range of -40°C to +85°C (I grade).
Are the AM26C31QDR and AM26C31IDG4 electrically interchangeable?
Yes. Both devices share the same functional block diagram, pinout, and electrical characteristics per the Texas Instruments datasheet, including 5-V operation, differential outputs, and three-state capability. The primary differences are temperature grade and packaging/ordering format.
What is the operating temperature range of each device?
The AM26C31QDR is rated for -40°C to +125°C (Q grade). The AM26C31IDG4 is rated for -40°C to +85°C (I grade). Designs requiring operation above +85°C should use the Q-grade device.
What package and pin count do these devices use?
Both the AM26C31QDR and AM26C31IDG4 are offered in a 16-pin SOIC (D) package. Pin functions are identical between the two orderable part numbers.
What is the difference between the R and G4 suffixes?
The "R" suffix on AM26C31QDR indicates tape-and-reel packaging. The "G4" suffix on AM26C31IDG4 indicates lead-free (RoHS-compliant) tube packaging. Both suffixes refer to packaging/ordering format, not to device function.
Can the AM26C31IDG4 be used as a drop-in replacement for the AM26C31QDR?
Functionally and pinout-wise, yes, since both are 16-pin SOIC quad differential line drivers with identical electrical specifications. However, the AM26C31IDG4 is only rated to +85°C, so it must not be substituted in applications requiring operation up to +125°C. Verify the target design's temperature requirements against the datasheet before substitution.
What supply voltage and interface standard do these devices support?
Both devices operate from a single 5-V supply and implement the RS-422/RS-485 differential interface, providing four differential line drivers with three-state outputs, per the Texas Instruments datasheet.