Part A
AM26LV32CDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3036 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Not a drop-in replacement
The AM26LV32CDR and AM26LS31CDE4 are not functionally interchangeable despite sharing the same quad differential line-driver family lineage. The AM26LV32CDR is a low-voltage quad differential line receiver, while the AM26LS31CDE4 is a quad differential line driver, so their signal direction, electrical interface, and application roles are fundamentally different. Designers must not substitute one for the other in an existing PCB layout without a full redesign of the interface stage.
Different signal direction
Different output type
Different supply voltage range
Different interface role
Parts at a glance
Part B
AM26LS31CDE4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8888 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 | AM26LV32CDR | AM26LS31CDE4 | 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. |
| Output Type | 3-state (tri-state) outputs | 3-state (tri-state) outputs | Both offer tri-state control, but the receiver's tri-state applies to its single-ended outputs while the driver's applies to its differential outputs, affecting bus sharing behavior. |
| Supply Voltage (VCC) | 3.0 V to 3.6 V | 4.75 V to 5.25 V | The two parts operate on different supply rails (3.3 V vs 5 V), so they cannot be dropped into the same socket without level and power considerations. |
| Signaling Standard | RS-422 / RS-485 compatible receiver | RS-422 / RS-423 compatible driver | Compatibility with the target differential standard determines whether the device can be used in a given interface design. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | The channel direction count must match the system architecture; swapping them reverses the signal flow. |
| Input/Output Logic Family | TTL-compatible inputs, 3-state outputs | TTL-compatible inputs, differential outputs | Logic-level compatibility affects how the device interfaces with surrounding digital circuitry. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint allow PCB compatibility, but the electrical role difference still prevents direct substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges mean both suit the same environmental conditions, though functional role still differs. |
| Data Rate Capability | Up to 32 Mbps (typical) | Up to 10 Mbps (typical) | Maximum data rate constrains the link speed; the receiver supports higher rates than the driver in this pairing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LV32CDR | AM26LS31CDE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 3V ~ 3.6V | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Receiver Hysteresis | 50 mV | - |
Frequently asked questions
What are the primary functional differences between the AM26LV32CDR and the AM26LS31CDE4?
The AM26LV32CDR is a quad differential line receiver designed for low-voltage (3.3 V) operation, while the AM26LS31CDE4 is a quad differential line driver designed for 5 V operation. They serve complementary roles in a differential transmission system: the AM26LS31CDE4 drives the signal, and the AM26LV32CDR receives it.
Can the AM26LV32CDR and AM26LS31CDE4 be used together in the same system?
Yes, they can be used together. The AM26LS31CDE4 (5 V driver) produces differential outputs that are compatible with the AM26LV32CDR (3.3 V receiver) input thresholds, provided the receiver's common-mode input range and the driver's output swing are respected per the respective datasheets. This is a common configuration for translating 5 V differential signaling to a 3.3 V logic interface.
What are the supply voltage requirements for each device?
The AM26LV32CDR operates from a single 3.3 V supply (typically 3.0 V to 3.6 V). The AM26LS31CDE4 operates from a single 5 V supply (typically 4.75 V to 5.25 V). They are not interchangeable in terms of supply voltage.
Are the AM26LV32CDR and AM26LS31CDE4 pin-compatible?
No. Although both are offered in 16-pin SOIC packages, their pin functions differ because one is a receiver and the other is a driver. The AM26LV32CDR has receiver inputs and logic outputs, while the AM26LS31CDE4 has logic inputs and differential driver outputs. They cannot be substituted for one another on the same PCB footprint without redesign.
What are the package and ordering differences between the AM26LV32CDR and AM26LS31CDE4?
The AM26LV32CDR is supplied in a 16-pin SOIC package with tape-and-reel packaging (the "R" suffix). The AM26LS31CDE4 is supplied in a 16-pin SOIC package with tube packaging (the "E4" suffix). Both are RoHS-compliant per their manufacturer documentation, but the packaging format and part suffix differ.
Which device supports higher signaling speeds?
Both devices are specified for similar differential signaling rates in their respective datasheets, typically up to 10 Mbps for the AM26LV32CDR receiver and up to 10 Mbps for the AM26LS31CDE4 driver. Actual achievable speed depends on cable length, termination, and system noise; consult the manufacturer datasheets for verified switching characteristics.
Do these devices support tri-state or enable functions?
Yes. The AM26LV32CDR receiver includes an active-high enable input that places the outputs in a high-impedance state when low. The AM26LS31CDE4 driver includes an active-high enable that places the differential outputs in a high-impedance state when low. These enable functions allow bus sharing and multiplexing in multi-drop systems.
What differential signaling standards do these devices support?
The AM26LV32CDR is designed to meet the requirements of TIA/EIA-422-B and TIA/EIA-485-A receiver specifications at 3.3 V. The AM26LS31CDE4 is designed to meet TIA/EIA-422-B and TIA/EIA-485-A driver specifications at 5 V. Confirm compliance details in the respective manufacturer datasheets before use in standards-critical designs.