Part A
AM26C31CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5213 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The AM26C31CDR and AM26C31IDG4 are functionally equivalent quad differential line drivers sharing the same logic family, channel count, supply voltage range, and output characteristics; the primary distinction is the operating temperature range, where the I-grade variant supports a wider industrial span. Both are viable substitutes in most designs, though the extended temperature capability of the AM26C31IDG4 should be validated against the target application's thermal requirements.
Function and Logic Family
High match
Channel Count and Output Type
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AM26C31IDG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9629 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 | AM26C31IDG4 | 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 the same circuit role. |
| Number of Drivers | 4 | 4 | The channel count must match to preserve the number of differential signals the board can drive. |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Compatible supply range ensures the part operates correctly on the existing 5 V rail without redesign. |
| Output Type | Differential (3-state) | Differential (3-state) | Three-state differential outputs allow bus sharing and match the signaling scheme required by RS-422/RS-485 style interfaces. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | The maximum data rate must meet the system's signaling speed for reliable communication. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint allow drop-in replacement on the same PCB layout. |
| Operating Temperature Range | 0°C to 70°C | -40°C to 85°C | The industrial-grade temperature range of the IDG4 variant supports harsher environments where the commercial-grade CDR may not be rated. |
| RoHS Compliance | RoHS compliant | RoHS compliant | Both meet environmental regulations, so compliance is not a differentiator for substitution. |
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 | AM26C31IDG4 |
|---|---|---|
| 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 | 0°C ~ 70°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the AM26C31CDR and AM26C31IDG4?
Both are quadruple differential line drivers from Texas Instruments, part of the AM26C31 family, designed to meet the requirements of ANSI TIA/EIA-422-B and ITU Recommendation V.11. They are used to drive balanced transmission lines in digital data transmission systems.
What is the difference between the AM26C31CDR and AM26C31IDG4?
The primary difference is the operating temperature range and package. The AM26C31CDR is specified for the commercial temperature range of 0°C to 70°C and is supplied in a 16-pin SOIC package with tape-and-reel packaging. The AM26C31IDG4 is specified for the industrial temperature range of -40°C to 85°C and is supplied in a 16-pin SOIC package in tube packaging.
Are the AM26C31CDR and AM26C31IDG4 electrically identical?
Yes, both devices share the same electrical characteristics and functional specifications, including supply voltage range of 4.5 V to 5.5 V, differential output voltage, and propagation delay. The differences are limited to the rated operating temperature range and the packaging format.
Can the AM26C31CDR be used as a drop-in replacement for the AM26C31IDG4?
Functionally and pinout-wise, both devices are compatible in the same 16-pin SOIC footprint. However, substitution is only acceptable if the application's ambient temperature remains within the commercial range of 0°C to 70°C. For applications requiring operation below 0°C or above 70°C, the AM26C31IDG4 must be used.
What is the function of the enable pins on these devices?
Both devices feature active-high enable inputs (G and G-bar) that allow the differential outputs to be placed in a high-impedance state. This permits multiple drivers to share a common bus without contention, which is useful in multipoint or party-line configurations.
What supply voltage do the AM26C31CDR and AM26C31IDG4 require?
Both devices operate from a single 5 V supply with a recommended range of 4.5 V to 5.5 V. They are not specified for 3.3 V operation, and the supply should be decoupled with a 0.1 µF ceramic capacitor placed close to the device.
Do these devices support RS-422 and RS-485 applications?
The AM26C31 family is specified to meet TIA/EIA-422-B and ITU V.11 requirements, making them suitable for RS-422 balanced line driving. They are not specified as RS-485 drivers, so they should not be used in RS-485 multipoint applications requiring the wider common-mode range and higher output drive of RS-485 transceivers.
What is the difference in packaging between the AM26C31CDR and AM26C31IDG4?
The AM26C31CDR is supplied in tape-and-reel format (suffix R), which is suited to automated pick-and-place assembly. The AM26C31IDG4 is supplied in tube packaging (suffix G4), which is typically used for manual handling or low-volume prototyping. Both use the same 16-pin SOIC body.