Part A
AM26LS33ACDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 1505 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The AM26LV31CDRG4 is a functional replacement candidate for the AM26LS33ACDR in 3.3 V low-voltage differential signaling applications, but it is not a direct drop-in substitute. The two devices share the same quad differential driver function and SOIC-16 footprint, yet they differ in supply voltage range, signaling standard, and output drive characteristics. Designers must validate supply compatibility, termination, and output levels before substituting in an existing 5 V RS-422/RS-485 design.
Supply Voltage Range
Validation required
Signaling Standard
Validation required
Package Type
High match
Output Drive Characteristics
Validation required
Parts at a glance
Part B
AM26LV31CDRG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 8618 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 | AM26LS33ACDR | AM26LV31CDRG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line driver | Receiver vs driver function determines whether the device can be used at the receiving or transmitting end of a differential link; they are not functionally interchangeable. |
| Supply Voltage (VCC) | 5 V nominal (4.75 V to 5.25 V) | 3.0 V to 3.6 V | Operating supply voltage must match the system rail; a 5 V receiver cannot be directly substituted in a 3.3 V design and vice versa. |
| Logic Family | RS-422 / RS-423 (5 V) | RS-422 (3.3 V low-voltage) | The logic family defines compatible signal levels and interface standards, affecting interoperability with other transceivers on the bus. |
| Driver / Receiver Type | Receiver with tri-state outputs | Driver with tri-state outputs | Direction of data flow is fundamental to circuit topology; substituting a driver for a receiver (or vice versa) will not work in the same socket. |
| Number of Channels | 4 receivers | 4 drivers | Channel count and direction must match the bus architecture to preserve signal routing and pinout compatibility. |
| Input/Output Compatibility | Accepts differential inputs, TTL-compatible outputs | Accepts TTL/CMOS inputs, differential outputs | Signal direction and logic-level compatibility determine whether the device can interface with the surrounding controller and bus. |
| Package | SOIC-16 (D) | SOIC-16 (D) | Package footprint affects PCB layout and assembly; identical SOIC-16 packages allow physical drop-in but not functional substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range must cover the application environment for reliable operation over the product lifetime. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS33ACDR | AM26LV31CDRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Driver |
| Protocol | - | RS422, RS485 |
| Number of Drivers/Receivers | 0/4 | 4/0 |
| Voltage - Supply | 4.75V ~ 5.25V | 3V ~ 3.6V |
| 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 AM26LS33ACDR and the AM26LV31CDRG4?
The AM26LS33ACDR is a quad differential line receiver designed for RS-422, RS-423, and RS-485 applications, featuring a wide common-mode input range and input hysteresis. The AM26LV31CDRG4 is a quad differential line driver designed for low-voltage (3.3 V) RS-422 and RS-485 applications, providing high output drive current. In short, the AM26LS33ACDR is a receiver, while the AM26LV31CDRG4 is a driver.
Are the AM26LS33ACDR and AM26LV31CDRG4 pin-to-pin compatible?
Both devices are offered in a 16-pin SOIC (D) package, but they are not functionally interchangeable because one is a receiver and the other is a driver. Pin assignments differ in function, so a direct drop-in substitution is not possible without verifying the signal direction and pinout against the respective datasheets.
What supply voltage does each device require?
The AM26LS33ACDR operates from a single 5 V supply (typically 4.75 V to 5.25 V). The AM26LV31CDRG4 operates from a 3.3 V supply (typically 3.0 V to 3.6 V), which is a key consideration when selecting between the two for a given system rail.
Can the AM26LV31CDRG4 drive a bus that is received by the AM26LS33ACDR?
Yes, in principle a 3.3 V differential driver such as the AM26LV31CDRG4 can drive a differential receiver such as the AM26LS33ACDR, provided the receiver's input thresholds and common-mode range are satisfied by the driver's output levels. The designer must confirm compatibility of output swing, common-mode voltage, and termination against both datasheets.
What are the operating temperature ranges for these devices?
Both the AM26LS33ACDR and the AM26LV31CDRG4 are specified for the commercial temperature range of 0°C to 70°C, as indicated by the "C" suffix in their part numbers. Industrial or extended-temperature variants should be selected if wider ranges are required.
Do these devices support tri-state output for bus sharing?
The AM26LV31CDRG4 driver includes an enable function that places its outputs in a high-impedance state, allowing multiple drivers to share a bus. The AM26LS33ACDR receiver also provides a tri-state output enable. Designers should verify the specific enable logic polarity and conditions in each datasheet.
Which device is better suited for a new 3.3 V RS-485 design?
For a new 3.3 V RS-485 design, the AM26LV31CDRG4 is the appropriate choice because it is specified for 3.3 V operation and provides the differential drive required for RS-485. The AM26LS33ACDR, being a 5 V receiver, would not serve as the bus driver in such a design.