Part A
AM26LV31IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3059 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The AM26LV31IDR and AM26LS31CDG4 are both quad differential line drivers with matching pinout and function, making the AM26LV31IDR a viable functional substitute for the AM26LS31CDG4 in most designs. However, the two devices differ in supply voltage range and signaling standard, so engineers should confirm that the lower-voltage LVDS-compatible operation of the AM26LV31IDR satisfies the target system's interface requirements before committing to the substitution.
Function and Channel Count
High match
Pinout and Package
High match
Supply Voltage Range
Validation required
Signaling Standard
Validation required
Parts at a glance
Part B
AM26LS31CDG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8504 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 | AM26LV31IDR | AM26LS31CDG4 | 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 differential line drivers, but the logic family and voltage levels differ, affecting interoperability with downstream receivers. |
| Logic Family | LVTTL/LVCMOS (low-voltage) | TTL/CMOS (5 V) | Input logic thresholds differ, so the driving logic must match the respective family to guarantee valid logic levels. |
| Number of Drivers | 4 | 4 | Both provide four differential drivers, so channel count is equivalent for multi-line bus applications. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The wider industrial temperature range of the AM26LV31IDR allows use in harsher environments where the commercial-grade AM26LS31CDG4 may not be rated. |
| Package / Mounting | SOIC-16 (surface mount) | SOIC-16 (surface mount) | Both use the same 16-pin SOIC footprint, so PCB layout can be shared, but electrical differences still require verification. |
| Propagation Delay | Typical ~10 ns | Typical ~20 ns | Faster propagation delay in the AM26LV31IDR supports higher data rates and tighter timing margins in high-speed interfaces. |
| Output Drive Current | ±60 mA (typical differential output) | ±60 mA (typical differential output) | Similar drive capability means both can drive comparable balanced transmission lines, though supply voltage differences affect actual swing. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free (Green) | RoHS compliant, lead-free (G4 suffix) | Both meet RoHS, so environmental compliance is not a differentiator, but the G4 suffix confirms lead-free construction for the AM26LS31CDG4. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LV31IDR | AM26LS31CDG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 AM26LS31CDG4?
The AM26LV31IDR is a low-voltage quad differential line driver operating from a 3.0 V to 3.6 V supply, while the AM26LS31CDG4 is a quad differential line driver designed for 5 V operation. The AM26LV31IDR is specified for RS-422 signaling with a typical 3.3 V logic interface, whereas the AM26LS31CDG4 is the industry-standard 5 V RS-422/RS-485 driver. They differ in supply voltage, output swing, and package (SOIC for the IDR suffix versus SOIC-16 for the CDG4).
Are the AM26LV31IDR and AM26LS31CDG4 pin-compatible?
Both devices are offered in 16-pin SOIC packages with the same quad-driver pinout (inputs 1A–4A, outputs 1Y–4Y and 1Z–4Z, enable pins, VCC, and GND). However, pin compatibility does not guarantee electrical interchangeability because the AM26LV31IDR operates at 3.3 V and the AM26LS31CDG4 at 5 V; the supply and logic levels must be verified for the target design.
Can the AM26LV31IDR directly replace the AM26LS31CDG4 in an existing 5 V design?
No. The AM26LV31IDR is rated for a 3.0 V to 3.6 V supply and is not specified for 5 V operation, so it cannot be used as a drop-in replacement in a 5 V system. The AM26LS31CDG4 is the appropriate choice for 5 V RS-422 driver applications.
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 AM26LS31CDG4 operates from a single 5 V supply (4.75 V to 5.25 V). Designs must match the driver supply to the system logic and bus levels.
What signaling standards do these drivers support?
Both are quad differential line drivers intended for balanced (differential) transmission. The AM26LV31IDR is specified for RS-422-type signaling at 3.3 V, and the AM26LS31CDG4 is specified for RS-422 and RS-485-type balanced transmission at 5 V. The actual compliance depends on the specific datasheet conditions and the system implementation.
What package options are available for these parts?
The AM26LV31IDR is supplied in a 16-pin SOIC (D) package in tape-and-reel form (R suffix). The AM26LS31CDG4 is supplied in a 16-pin SOIC (D) package in tube form (G4 suffix indicates Pb-free/RoHS-compliant). Both use the same 16-pin SOIC footprint, but the reel/tube packaging and Pb-free status differ.
Which device should be selected for a new 3.3 V RS-422 design?
For a new 3.3 V RS-422 design, the AM26LV31IDR is the appropriate choice because it is specified for 3.0 V to 3.6 V operation and provides the required differential output levels at that supply. The AM26LS31CDG4 is intended for 5 V systems and should not be used at 3.3 V.