Part A
AM26LV31IDR
德州儀器
- Lifecycle
- Active
- Stock
- 3059 件
- Package
- SOIC-16
- Series
- 介面-驅動器、接收器、收發器
Replacement verdict
Compatible functional replacement candidate
The AM26LV31IDR and AM26LS31CDRE4 are both quad differential line drivers in the same SOIC-16 package with matching pinout and 5 V supply operation, making them strong functional replacement candidates. The AM26LV31IDR offers a lower minimum supply voltage and faster switching performance, while the AM26LS31CDRE4 provides a wider operating temperature range. Designers should validate the supply voltage window and thermal margin for their specific application before substituting.
Function and Channel Count
High match
Package and Pinout
High match
Supply Voltage Range
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AM26LS31CDRE4
德州儀器
- Lifecycle
- Active
- Stock
- 2303 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 | AM26LV31IDR | AM26LS31CDRE4 | Why it matters |
|---|---|---|---|
| Supply Voltage (Vcc) | 3.0 V to 3.6 V | 4.75 V to 5.25 V | The two devices operate on different supply rails (3.3 V vs 5 V), so they are not drop-in replacements without adjusting the system power supply. |
| Output Type | 3-state differential line driver (RS-422 compatible) | 3-state differential line driver (RS-422 compatible) | Both are quad differential line drivers, but the LV variant is optimized for low-voltage signaling while the LS variant targets 5 V TTL-compatible systems. |
| Number of Drivers | 4 | 4 | Both provide four independent drivers, so channel count is functionally equivalent for multi-line bus applications. |
| Output Current Drive | ±30 mA (typical) | ±60 mA (typical) | The LS device can source/sink more current, which affects drive capability over long cables and heavily loaded buses. |
| Propagation Delay | ~10 ns (typical) | ~20 ns (typical) | Faster propagation delay in the LV part supports higher data rates, which matters for timing-critical serial links. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The industrial temperature range of the LV part allows use in harsher environments, while the LS part is limited to commercial temperature ranges. |
| Package / Pin Count | SOIC-16 (16 pins) | SOIC-16 (16 pins) | Identical package and pinout enable board-level compatibility, though electrical differences still require design review. |
| Input Logic Compatibility | LVTTL/LVCMOS compatible | TTL compatible | Input thresholds differ, so the driving logic family must match the selected device to ensure valid logic levels. |
| RoHS Status | RoHS compliant | RoHS compliant (E4 suffix) | Both meet RoHS, so environmental compliance is not a differentiator for substitution decisions. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LV31IDR | AM26LS31CDRE4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Driver | Driver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 4/0 | 4/0 |
| Voltage - Supply | 3V ~ 3.6V | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AM26LV31IDR and AM26LS31CDRE4?
The AM26LV31IDR is a low-voltage quad differential line driver operating from a 3.0 V to 3.6 V supply, while the AM26LS31CDRE4 is a quad differential line driver designed for 5 V operation. The AM26LV31IDR is specified for low-voltage differential signaling with reduced output swing, whereas the AM26LS31CDRE4 provides standard RS-422 compatible outputs at 5 V. They differ in supply voltage range, output levels, and target applications.
Are the AM26LV31IDR and AM26LS31CDRE4 pin-to-pin compatible?
Both devices are offered in 16-pin SOIC packages with the same quad driver pinout (inputs, outputs, enables, GND, and VCC). However, pin-to-pin compatibility does not guarantee electrical interchangeability because the supply voltage and output swing requirements differ. The AM26LV31IDR operates at 3.3 V while the AM26LS31CDRE4 operates at 5 V, so a direct substitution requires verifying the system supply and receiver compatibility.
What supply voltage does each device require?
The AM26LV31IDR operates from a single 3.0 V to 3.6 V supply, typically 3.3 V. The AM26LS31CDRE4 operates from a single 5 V supply, typically 4.75 V to 5.25 V. The supply voltage difference is a primary reason the two parts are not directly interchangeable without design validation.
What are the output signal characteristics of each driver?
The AM26LV31IDR provides low-voltage differential outputs with a reduced swing suitable for low-voltage RS-422-type signaling, while the AM26LS31CDRE4 provides standard 5 V differential outputs compatible with RS-422 receivers. The output swing and common-mode levels differ, so the receiving device must be matched to the driver's signaling level.
Can the AM26LV31IDR directly replace the AM26LS31CDRE4 in an existing 5 V design?
No. The AM26LV31IDR is rated for a 3.0 V to 3.6 V supply and cannot be operated at 5 V. Replacing an AM26LS31CDRE4 with an AM26LV31IDR in a 5 V system would exceed the AM26LV31IDR's supply rating and is not a valid substitution. The system supply and receiver thresholds must be re-evaluated.
What are the operating temperature ranges for these devices?
The AM26LV31IDR is specified over the industrial temperature range of -40°C to 85°C. The AM26LS31CDRE4 is specified over the commercial temperature range of 0°C to 70°C. Designs requiring extended temperature operation should account for this difference.
Are both devices RoHS compliant and available in tape and reel?
Both the AM26LV31IDR and AM26LS31CDRE4 are offered in RoHS-compliant 16-pin SOIC packages and are available in tape-and-reel packaging, as indicated by the R suffix in their orderable part numbers. Designers should confirm the specific compliance and packaging documentation from the manufacturer's datasheet for the exact orderable part.
Which device should be selected for a new 3.3 V differential driver design?
For a new 3.3 V system, the AM26LV31IDR is the appropriate choice because it is specified for 3.0 V to 3.6 V operation and provides low-voltage differential outputs. The AM26LS31CDRE4 is intended for 5 V systems and should not be used in a 3.3 V design without verifying that its 5 V supply requirement is met.