Part A
AM26C32CDR
德州儀器
- Lifecycle
- Active
- Stock
- 2477 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Not a drop-in replacement
The AM26C32CDR and AM26C31CDRE4 are complementary rather than interchangeable devices: the AM26C32CDR is a quad differential line receiver, while the AM26C31CDRE4 is a quad differential line driver. Although both share the same SOIC-16 package and 5 V nominal supply, their signal direction, input/output architecture, and channel function differ fundamentally, so one cannot directly substitute for the other in an existing design.
Different device function
Receiver vs driver
Different I/O architecture
Not pin-function compatible
Parts at a glance
Part B
AM26C31CDRE4
德州儀器
- Lifecycle
- Active
- Stock
- 7084 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 | AM26C32CDR | AM26C31CDRE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple Differential Line Receiver | Quadruple Differential Line Driver | A receiver and a driver serve opposite roles in a differential link; they are not directly interchangeable in the same socket. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines the direction of signal flow and whether the device can transmit or receive on a differential bus. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) driver outputs | Tri-state capability allows bus sharing, but the electrical nature of the outputs differs between a receiver and a driver. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained, though the internal function differs. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data rates indicate comparable signaling speed capability for RS-422/RS-485 style links. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint allow physical board compatibility, but functional role still differs. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range supports use in similar environmental conditions. |
| Protocol Compatibility | RS-422 / RS-485 receiver | RS-422 / RS-485 driver | Both target RS-422/RS-485 systems, but one is the receive side and the other is the transmit side of the interface. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32CDR | AM26C31CDRE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Protocol | RS422, RS423 | - |
| Receiver Hysteresis | 60 mV | - |
Frequently asked questions
What are the AM26C32CDR and AM26C31CDRE4?
The AM26C32CDR is a quad differential line receiver, while the AM26C31CDRE4 is a quad differential line driver. Both are members of the AM26C series of RS-422/RS-485 interface devices from Texas Instruments, housed in a 16-pin SOIC package.
Can the AM26C32CDR and AM26C31CDRE4 be used together in a communication link?
Yes. The AM26C31CDRE4 driver and AM26C32CDR receiver are designed to operate together over balanced transmission lines, forming a complete RS-422/RS-485 differential communication interface. The driver converts TTL/CMOS logic levels to differential outputs, and the receiver converts differential inputs back to TTL/CMOS logic levels.
What is the functional difference between the AM26C32CDR and AM26C31CDRE4?
The AM26C32CDR is a receiver that accepts differential input signals and provides single-ended TTL/CMOS outputs. The AM26C31CDRE4 is a driver that accepts TTL/CMOS inputs and produces differential outputs. They perform complementary functions in a differential signaling system and are not interchangeable.
Do the AM26C32CDR and AM26C31CDRE4 share the same package and pinout?
Both devices are offered in a 16-pin SOIC (D) package, but their pin functions differ because one is a driver and the other is a receiver. The pinout assignments are defined in the respective Texas Instruments datasheets and are not pin-for-pin compatible for substitution.
What supply voltage do the AM26C32CDR and AM26C31CDRE4 require?
Both devices operate from a single 5 V supply, consistent with the AM26C series specifications published by Texas Instruments. Designers should confirm the exact recommended operating conditions in the respective datasheets before finalizing a design.
What does the "E4" suffix on AM26C31CDRE4 indicate compared to AM26C32CDR?
The "E4" suffix is a Texas Instruments ordering/package designation related to lead finish and environmental compliance (green/RoHS-compliant packaging). It does not change the electrical function of the device. The AM26C32CDR and AM26C31CDRE4 remain functionally distinct devices (receiver versus driver).
Are the AM26C32CDR and AM26C31CDRE4 suitable for RS-485 multi-point applications?
The AM26C31CDRE4 driver and AM26C32CDR receiver are specified for balanced differential data transmission consistent with RS-422/RS-485 signaling. Whether a given network supports multi-point operation depends on the driver's enable/disable control and the overall bus configuration; designers should verify against the datasheet and system requirements.