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 AM26C31CDE4 are complementary rather than interchangeable devices: the AM26C32CDR is a quad differential line receiver, while the AM26C31CDE4 is a quad differential line driver. Because their signal direction, I/O function, and internal architecture differ fundamentally, substituting one for the other is not feasible in any bidirectional or point-to-point link without redesigning the interface.
Different signal direction
Receiver vs driver function
Different I/O architecture
Not functionally interchangeable
Parts at a glance
Part B
AM26C31CDE4
德州儀器
- Lifecycle
- Active
- Stock
- 6869 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 | AM26C31CDE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple Differential Line Receiver | Quadruple Differential Line Driver | Receiver vs driver roles are not interchangeable; they sit on opposite ends of a differential link. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | Determines signal direction and whether the part can transmit or receive on the bus. |
| Output Type | 3-state (tri-state) receiver outputs | 3-state (tri-state) driver outputs | Tri-state capability enables bus sharing, but the electrical behavior differs between driver and receiver outputs. |
| Input/Output Logic | Differential inputs, single-ended TTL/CMOS outputs | Single-ended TTL/CMOS inputs, differential outputs | Signal conversion direction differs, so each part interfaces with the bus in the opposite direction. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint allow drop-in board placement, though function still differs. |
| Operating Temperature Range | 0°C to 70°C | 0°C to 70°C | Commercial temperature range matches, so environmental suitability is equivalent. |
| Standard Compliance | TIA/EIA-422-B and TIA/EIA-423-B compatible receiver | TIA/EIA-422-B and TIA/EIA-423-B compatible driver | Both meet the same interface standards but fulfill complementary driver/receiver roles in the link. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32CDR | AM26C31CDE4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 primary functional differences between the AM26C32CDR and the AM26C31CDE4?
The AM26C32CDR is a quad differential line receiver, while the AM26C31CDE4 is a quad differential line driver. The AM26C32CDR receives differential signals and converts them to TTL-compatible outputs, whereas the AM26C31CDE4 accepts TTL inputs and drives differential outputs compliant with RS-422/RS-485 signaling.
Are the AM26C32CDR and AM26C31CDE4 pin-compatible and can they be used as drop-in replacements for each other?
No. Although both are 16-pin devices, they are functionally different (receiver vs. driver) and are not interchangeable. The AM26C32CDR is a receiver and the AM26C31CDE4 is a driver; substituting one for the other will not provide the required signal direction and will not function correctly in the same circuit position.
What are the package and ordering differences between the AM26C32CDR and AM26C31CDE4?
The AM26C32CDR is supplied in a 16-pin SOIC package (tape and reel, "R" suffix). The AM26C31CDE4 is supplied in a 16-pin SOIC package with the "E4" suffix, which denotes a specific lead finish/ordering variant per Texas Instruments. Both are 16-pin SOIC devices, but the ordering suffixes indicate different packaging/finish options.
What supply voltage and signaling standards do these devices support?
Both the AM26C32CDR and AM26C31CDE4 operate from a single 5 V supply and are designed for RS-422/RS-485 balanced differential signaling. The AM26C32CDR receiver provides TTL-compatible outputs, and the AM26C31CDE4 driver accepts TTL inputs and produces differential outputs suitable for RS-422/RS-485 buses.
Can the AM26C32CDR and AM26C31CDE4 be used together in the same RS-422/RS-485 system?
Yes. Because one is a receiver (AM26C32CDR) and the other is a driver (AM26C31CDE4), they are complementary and can be used together in a full-duplex or bidirectional RS-422/RS-485 link, provided the system design accounts for the driver/receiver pairing and bus termination requirements.
Do both devices share the same operating temperature range?
Both the AM26C32CDR and AM26C31CDE4 are specified for the commercial temperature range of 0°C to 70°C per their respective Texas Instruments datasheets. Designers requiring industrial or extended temperature operation should consult the manufacturer for appropriately rated variants.
What are the key electrical characteristics to consider when comparing these two parts?
The AM26C32CDR receiver features high input impedance, a common-mode range suitable for RS-422/RS-485, and TTL-compatible outputs. The AM26C31CDE4 driver provides differential output voltage meeting RS-422/RS-485 requirements and includes output enable control. Because they perform opposite functions, their electrical parameters are not directly comparable; each should be evaluated against its role in the system.