Part A
AM26LS31CDR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7571 ПКС
- Package
- SOIC-16
- Series
- Интерфейс - драйверы, приемники, передатчики
Replacement verdict
Not a drop-in replacement
The AM26LV32EIDR and AM26LS31CDR are not functionally interchangeable: the AM26LV32EIDR is a low-voltage quad differential line receiver, while the AM26LS31CDR is a 5 V quad differential line driver. Their signal direction, supply voltage range, and output characteristics differ fundamentally, so substituting one for the other is not feasible without redesigning the interface.
Different signal direction
Different supply voltage
Different output type
Different input threshold
Parts at a glance
Part B
AM26LV32EIDR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2110 ПКС
- Package
- SOIC-16
- Series
- Интерфейс - драйверы, приемники, передатчики
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM26LV32EIDR | AM26LS31CDR | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | A receiver and a driver serve opposite roles in a differential link, so they are not directly interchangeable in the same socket. |
| Signal direction | Receives differential inputs, outputs single-ended | Accepts single-ended inputs, drives differential outputs | Direction determines whether the device can be used at the receiving or transmitting end of a bus. |
| Supply voltage (nominal) | 3.3 V | 5 V | Different supply rails affect logic-level compatibility and whether the part can drop into an existing 3.3 V or 5 V design. |
| Output type | 3-state single-ended outputs | 3-state differential outputs | Output topology must match the bus signaling scheme; a differential driver cannot directly replace a single-ended receiver output. |
| Input type | Differential inputs with wide common-mode range | Single-ended TTL-compatible inputs | Input structure determines noise immunity and the type of signal source the device can accept. |
| Standard compliance | Compatible with TIA/EIA-422 and TIA/EIA-485 signaling | Compatible with TIA/EIA-422 and TIA/EIA-423 signaling | Standards compliance defines which serial bus protocols the device can legally and reliably interface with. |
| Package | 16-pin SOIC | 16-pin SOIC | Matching package footprints allow board-level compatibility even when electrical roles differ. |
| Operating temperature range | -40 °C to +85 °C | 0 °C to +70 °C | Wider temperature ratings affect suitability for industrial versus commercial environments. |
| Number of channels | 4 receivers | 4 drivers | Channel count and channel function must align with the number of lines being received or driven in the system. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS31CDR | AM26LV32EIDR |
|---|---|---|
| Part Status | Active | Active |
| Type | Driver | Receiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 4/0 | 0/4 |
| Voltage - Supply | 4.75V ~ 5.25V | 3V ~ 3.6V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Receiver Hysteresis | - | 35 mV |
Frequently asked questions
What are the primary functional differences between the AM26LV32EIDR and the AM26LS31CDR?
The AM26LV32EIDR is a low-voltage quad differential line receiver designed for 3.3 V operation, while the AM26LS31CDR is a quad differential line driver designed for 5 V operation. They serve complementary roles in a differential transmission system: the AM26LS31CDR drives the signal, and the AM26LV32EIDR receives it.
Can the AM26LV32EIDR and AM26LS31CDR be used together in the same system?
Yes. The AM26LS31CDR driver and AM26LV32EIDR receiver are commonly paired in differential data transmission systems. The AM26LS31CDR generates differential outputs compliant with RS-422/RS-485 signaling, and the AM26LV32EIDR is designed to receive such differential signals at 3.3 V logic levels, making them compatible in a driver-receiver link.
What supply voltage does each device require?
The AM26LV32EIDR operates from a single 3.3 V supply (typically 3.0 V to 3.6 V), while the AM26LS31CDR operates from a single 5 V supply (typically 4.75 V to 5.25 V). Level translation may be required when interfacing the two devices in a shared logic system.
Do both devices use the same package and pinout?
Both the AM26LV32EIDR and AM26LS31CDR are offered in a 16-pin SOIC (D) package. However, their pin functions differ because one is a receiver and the other is a driver, so they are not pin-for-pin interchangeable despite sharing the same package outline.
What are the key AC performance characteristics of the AM26LS31CDR?
The AM26LS31CDR is specified with a typical propagation delay of approximately 10 ns and supports data rates suitable for RS-422/RS-485 differential transmission. It features three-state outputs and is designed for balanced differential line driving.
What input sensitivity and common-mode range does the AM26LV32EIDR support?
The AM26LV32EIDR provides a wide common-mode input range of approximately -7 V to +7 V and a high input sensitivity, enabling reliable reception of small differential signals in noisy environments. It also includes a fail-safe feature that sets the output to a known high state when the inputs are open or undriven.
Are these devices suitable for RS-422 and RS-485 applications?
Yes. The AM26LS31CDR is a quad differential line driver intended for RS-422 and RS-485 balanced transmission, and the AM26LV32EIDR is a quad differential line receiver suitable for receiving RS-422/RS-485 signals. Together they form a compatible driver-receiver pair for such interfaces.
What are the operating temperature ranges for the AM26LV32EIDR and AM26LS31CDR?
Both devices are specified for the industrial temperature range of -40 °C to +85 °C, making them suitable for use in industrial and commercial electronic systems.