Part A
AM26C31IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2239 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The AM26C31CDR and AM26C31IDR are functionally equivalent quad differential line drivers that share the same package, pinout, and electrical characteristics, with the primary distinction being the operating temperature range. The AM26C31IDR is rated for the industrial temperature range of -40°C to 85°C, while the AM26C31CDR is rated for the commercial range of 0°C to 70°C. For applications operating within the commercial temperature envelope, the AM26C31IDR serves as a direct functional substitute with the added benefit of extended thermal headroom.
Function and Logic Family
High match
Package and Pinout
High match
Supply Voltage and Electrical Characteristics
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AM26C31CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5213 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
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 | AM26C31IDR | Why it matters |
|---|---|---|---|
| Operating Temperature Range | 0°C to 70°C | -40°C to 85°C | Determines the environments in which the device can reliably operate; the industrial-grade version supports wider temperature extremes. |
| Function | Quadruple differential line driver | Quadruple differential line driver | Both parts perform the same core function, so they are functionally interchangeable in circuit design. |
| Number of Drivers | 4 | 4 | The number of differential drivers determines how many signal lines can be driven per package. |
| Supply Voltage (VCC) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Defines the required power supply range for proper operation and compatibility with the system rail. |
| Output Type | 3-state differential | 3-state differential | Three-state outputs allow multiple drivers to share a bus, which is essential for multipoint bus architectures. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint ensure the parts are drop-in compatible on the same PCB layout. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Maximum signaling rate must meet the application's data throughput requirements. |
| Standard Compliance | TIA/EIA-422-B, TIA/EIA-485-A | TIA/EIA-422-B, TIA/EIA-485-A | Compliance with these standards ensures interoperability with other compliant transceivers on the bus. |
| Grade / Qualification | Commercial grade | Industrial grade | The grade reflects the temperature and reliability qualification, affecting suitability for harsh or industrial environments. |
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 | AM26C31IDR | AM26C31CDR |
|---|---|---|
| Part Status | Active | Active |
| 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 AM26C31CDR and AM26C31IDR?
Both are quad differential line drivers from Texas Instruments in the AM26C31 family, designed to meet the requirements of TIA/EIA-422-B and ITU Recommendation V.11. They are functionally identical devices offered in the same SOIC-16 (D) package, with the only documented difference being the operating temperature range.
What is the difference between the AM26C31CDR and AM26C31IDR?
The suffix letter denotes the temperature grade. The AM26C31CDR (C grade) is specified for operation from 0°C to 70°C, while the AM26C31IDR (I grade) is specified for operation from -40°C to 85°C. Both are supplied in a 16-pin SOIC package on tape and reel.
Are the AM26C31CDR and AM26C31IDR pin-compatible and functionally interchangeable?
Yes. Both devices share the same 16-pin SOIC (D) package, identical pinout, and identical electrical function as quad differential line drivers. They differ only in rated operating temperature range, so substitution is valid only when the target application's ambient temperature falls within the selected grade's specified range.
What are the key electrical specifications common to both devices?
Both drivers operate from a single 5 V supply (4.5 V to 5.5 V range), provide differential outputs meeting TIA/EIA-422-B and V.11 requirements, feature 3-state outputs with a common enable, and are characterized for output current and switching performance per the Texas Instruments AM26C31 datasheet. They are pin-compatible with the AM26LS31 family.
Which grade should be selected for an industrial application?
The AM26C31IDR should be selected when the ambient operating temperature can extend below 0°C or above 70°C, since its -40°C to 85°C rating covers industrial environments. The AM26C31CDR is appropriate only for commercial applications confined to 0°C to 70°C.
Do both parts support the same data transmission standards?
Yes. Both the AM26C31CDR and AM26C31IDR are designed to meet TIA/EIA-422-B and ITU Recommendation V.11, providing balanced differential output suitable for RS-422-type serial data transmission. The applicable standard compliance is identical across both temperature grades.
What package and packing options do these parts use?
Both the AM26C31CDR and AM26C31IDR are offered in the 16-pin SOIC (D) package and are supplied on tape and reel, as indicated by the "R" suffix in the orderable part number. Package dimensions and PCB land patterns are identical between the two grades.