Part A
AM26C32IDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6435 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26C32IDR and AM26C31CDRE4 are complementary quad differential bus devices with opposing signal directions, so they cannot substitute for one another in a shared circuit position. The AM26C32IDR is a quad differential line receiver, while the AM26C31CDRE4 is a quad differential line driver; selecting between them depends on whether the design requires receiving or transmitting differential signals, not on pin or package interchangeability.
Different device function
Different signal direction
Different output type
Different input type
Parts at a glance
Part B
AM26C31CDRE4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 7084 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, 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 | AM26C31CDRE4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver vs driver roles are not interchangeable; a receiver cannot transmit and a driver cannot receive, so they serve opposite ends of a differential link. |
| Number of Drivers | 0 | 4 | The driver count determines how many differential lines the device can actively transmit onto; the receiver has none. |
| Number of Receivers | 4 | 0 | The receiver count determines how many differential input channels can be sensed; the driver has none. |
| Output Type | 3-state (tri-state) outputs | 3-state (tri-state) outputs | Tri-state capability allows bus sharing; both support it, but the receiver's tri-state applies to its logic outputs while the driver's applies to its differential outputs. |
| Supply Voltage (Vcc) | 5 V (4.5 V to 5.5 V) | 5 V (4.5 V to 5.5 V) | Both operate from a nominal 5 V rail, so power-supply compatibility is maintained across the pair. |
| Data Rate | Up to 10 Mbps | Up to 10 Mbps | Matching data-rate capability ensures the link can run at the same signaling speed regardless of which end is populated. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both parts suit the same industrial environments and thermal budgets. |
| Package / Mounting | 16-SOIC, surface mount | 16-SOIC, surface mount | Same package and footprint allow either device to be placed on the same PCB land pattern, simplifying layout and substitution. |
| Standard Compliance | TIA/EIA-422-B and TIA/EIA-485-A compatible receiver | TIA/EIA-422-B and TIA/EIA-485-A compatible driver | Both meet the same RS-422/RS-485 standards, so they can form a compliant differential link when paired, but each fulfills only one side of the standard. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26C32IDR | 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 | -40°C ~ 85°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 AM26C32IDR and the AM26C31CDRE4?
The AM26C32IDR is a quad differential line receiver, while the AM26C31CDRE4 is a quad differential line driver. The AM26C32IDR converts differential input signals to TTL-compatible outputs, whereas the AM26C31CDRE4 converts TTL inputs to differential outputs for balanced transmission.
Are the AM26C32IDR and AM26C31CDRE4 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 AM26C31CDRE4 require?
Both devices operate from a single 5 V supply (nominal), consistent with the standard AM26C32 and AM26C31 families. Designers should confirm the exact recommended operating range in the respective manufacturer datasheet before use.
Can the AM26C32IDR and AM26C31CDRE4 be used together in a communication link?
Yes. Because one is a differential driver and the other a differential receiver, they can form a balanced transmission pair over twisted-pair cable, with the AM26C31CDRE4 transmitting and the AM26C32IDR receiving at the opposite end.
What is the significance of the package suffixes IDR and CDRE4?
The "D" in both suffixes denotes a 16-pin SOIC package. The "R" indicates tape-and-reel packaging. The "E4" suffix on the AM26C31CDRE4 denotes a lead-free (RoHS-compliant) finish per the manufacturer's ordering convention. Buyers should verify the exact ordering code in the manufacturer datasheet.
Do these devices support the same data rates and signaling standards?
Both are members of the AM26C31/AM26C32 family intended for balanced differential data transmission, commonly associated with RS-422/RS-485-type interfaces. Actual maximum data rate and compliance should be confirmed against the specific manufacturer datasheet for each part number.
Which part should be selected for a new design requiring a differential transmitter?
The AM26C31CDRE4 is the appropriate choice when a quad differential line driver is required. The AM26C32IDR should be selected only when a quad differential line receiver is needed. Selection should be based on the signal direction required by the system architecture.