Part A
AM26C31QDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1424 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31QDR are complementary devices rather than interchangeable parts: the AM26C32IDR is a quad differential line receiver, while the AM26C31QDR is a quad differential line driver. Their signal direction, I/O architecture, and functional roles differ fundamentally, so the AM26C31QDR cannot directly replace the AM26C32IDR in an existing design without re-engineering the interface.
Different device function
Different signal direction
Different I/O architecture
Different package and grade
Parts at a glance
Part B
AM26C32IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6435 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, 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 | AM26C32IDR | AM26C31QDR | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver serve opposite roles in a differential bus, so they are not direct substitutes for the same socket function. |
| Number of Drivers | 0 | 4 | Driver count determines whether the device can transmit differential signals onto a bus. |
| Number of Receivers | 4 | 0 | Receiver count determines whether the device can accept differential signals from a bus. |
| Output Type | 3-state | 3-state differential | Three-state outputs allow multiple devices to share a bus without contention; the driver's differential output is required to drive a twisted-pair bus. |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | Both operate from a standard 5 V rail, so power-supply compatibility is maintained. |
| Data Rate | 10 Mbps | 10 Mbps | Matching data rates ensure the link can support the same signaling speed regardless of direction. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 125°C | The wider temperature range of the driver allows use in harsher environments, which may matter for industrial applications. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Identical package and mounting allow either part to fit the same PCB footprint, though the electrical function still differs. |
| Protocol Standard | RS-422 / RS-485 receiver | RS-422 / RS-485 driver | Both target the same differential bus standards, but one is the receive side and the other is the transmit side of the link. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C31QDR | AM26C32IDR |
|---|---|---|
| Part Status | Active | Active |
| Type | - | Receiver |
| Protocol | - | RS422, RS423 |
| Number of Drivers/Receivers | - | 0/4 |
| Receiver Hysteresis | - | 60 mV |
| Voltage - Supply | - | 4.5V ~ 5.5V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AM26C32IDR and AM26C31QDR?
The AM26C32IDR is a quad differential line receiver, while the AM26C31QDR is a quad differential line driver. The receiver converts differential input signals to TTL-compatible outputs, whereas the driver converts TTL inputs to differential outputs compliant with RS-422 and RS-485 standards.
Are the AM26C32IDR and AM26C31QDR pin-compatible?
Both devices are offered in a 16-pin SOIC package (D suffix) with the same pin count, but their pin functions differ because one is a receiver and the other is a driver. They are not functionally interchangeable on the same PCB without redesigning the signal path.
What supply voltage do the AM26C32IDR and AM26C31QDR require?
Both devices operate from a single 5 V supply (nominal 4.5 V to 5.5 V). The AM26C32IDR receiver and AM26C31QDR driver are specified for 5 V operation per their respective Texas Instruments datasheets.
Do both devices support RS-422 and RS-485 applications?
Yes. The AM26C31QDR driver is designed for balanced transmission lines meeting RS-422 and RS-485 requirements, and the AM26C32IDR receiver is designed to receive balanced differential signals in RS-422 and RS-485 systems. They are commonly paired in a full-duplex or half-duplex link.
What is the difference in the QDR versus IDR suffix ordering codes?
The "Q" in AM26C31QDR denotes an automotive-qualified device (AEC-Q100) from Texas Instruments, while the "I" in AM26C32IDR denotes an industrial-grade device. The "DR" suffix in both indicates tape-and-reel packaging in a 16-pin SOIC.
Can the AM26C31QDR drive a line terminated by the AM26C32IDR?
Yes. The AM26C31QDR differential driver and AM26C32IDR differential receiver are designed to interoperate on balanced transmission lines, with the driver providing the differential output levels the receiver is specified to detect.
What are the operating temperature ranges for these two devices?
The AM26C32IDR is specified over the industrial temperature range of -40°C to +85°C. The AM26C31QDR, as an automotive-qualified variant, is specified over the AEC-Q100 automotive temperature range as stated in its Texas Instruments datasheet.
Do both parts feature three-state outputs?
Yes. The AM26C32IDR receiver provides three-state outputs controlled by an enable pin, and the AM26C31QDR driver provides three-state differential outputs controlled by an enable pin, allowing both devices to be disconnected from the bus when not active.