Part A
AM26LS33ACDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 1505 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Not a drop-in replacement
The AM26LS33ACDR and AM26LS31CDG4 are both quad differential line drivers, but they differ in receiver input threshold behavior, package footprint, and qualification grade, so the AM26LS33ACDR is not a direct drop-in replacement for the AM26LS31CDG4 in existing designs.
Different input threshold
Different package footprint
Different qualification grade
Different supply current
Parts at a glance
Part B
AM26LS31CDG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 8504 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 | AM26LS31CDG4 | 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 bus; they are not functionally interchangeable. |
| Device Type | Receiver | Driver | The signal direction (input vs. output) is fundamental to circuit design and cannot be substituted without redesign. |
| Number of Drivers/Receivers | 0 drivers / 4 receivers | 4 drivers / 0 receivers | The channel configuration must match the bus architecture; a receiver cannot replace a driver in a transmit path. |
| Receiver Input Sensitivity | ±200 mV (typical) | Not applicable (driver) | Input sensitivity defines the minimum differential voltage a receiver can detect; drivers do not have this parameter. |
| Output Current Capability | Not applicable (receiver) | ±60 mA (typical drive) | Driver output current determines the ability to drive terminated differential lines; receivers do not source line current. |
| Supply Voltage (VCC) | 5 V nominal | 5 V nominal | Both operate from a 5 V supply, so power rail compatibility is maintained, though the functional role still differs. |
| Package / Mounting | SOIC-16, surface mount | SOIC-16, surface mount | Identical package and footprint allow board-level interchangeability, but the electrical function must still match the design role. |
| Operating Temperature Range | -40°C to +85°C | 0°C to +70°C | The wider temperature range of the receiver suits harsher environments; the driver's commercial range may limit use in industrial applications. |
| Protocol Compatibility | RS-422 / RS-485 receiver compatible | RS-422 / RS-485 driver compatible | Both support differential bus standards, but one is the receive side and the other the transmit side of the link. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS33ACDR | AM26LS31CDG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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 | 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 AM26LS33ACDR and the AM26LS31CDG4?
The AM26LS33ACDR is a quad differential line receiver featuring a fail-safe input threshold and a wide common-mode input range, while the AM26LS31CDG4 is a quad differential line driver designed to meet the requirements of RS-422 and RS-485 standards. The AM26LS33ACDR receives differential signals, whereas the AM26LS31CDG4 transmits them.
Are the AM26LS33ACDR and AM26LS31CDG4 pin-to-pin compatible?
No. The AM26LS33ACDR is a receiver and the AM26LS31CDG4 is a driver; their internal circuitry and pin functions differ. They are not direct substitutes for one another in a circuit, although both are offered in a 16-pin SOIC package.
What are the supply voltage requirements for each device?
Both the AM26LS33ACDR and the AM26LS31CDG4 operate from a single 5 V nominal supply. The AM26LS33ACDR is specified for a supply voltage range of 4.75 V to 5.25 V, and the AM26LS31CDG4 is specified over the same 4.75 V to 5.25 V range.
Do both components support the RS-422 standard?
Yes. The AM26LS31CDG4 is a quad differential line driver designed to meet the requirements of RS-422 and RS-485, and the AM26LS33ACDR is a quad differential line receiver intended for use in RS-422 and RS-485 systems. They are commonly paired in balanced differential transmission links.
What is the operating temperature range for the AM26LS33ACDR and AM26LS31CDG4?
The AM26LS33ACDR is specified for operation over the commercial temperature range of 0°C to 70°C. The AM26LS31CDG4 is also specified for the commercial temperature range of 0°C to 70°C.
What package type do the AM26LS33ACDR and AM26LS31CDG4 use?
Both devices are supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package. The AM26LS33ACDR is provided in a 16-pin SOIC with a tape-and-reel carrier, and the AM26LS31CDG4 is provided in a 16-pin SOIC tube or rail package.
Can the AM26LS33ACDR and AM26LS31CDG4 be used together in a single communication link?
Yes. In a typical balanced differential link, the AM26LS31CDG4 driver transmits the differential signal and the AM26LS33ACDR receiver at the far end converts it back to a single-ended logic level. This pairing is consistent with RS-422 and RS-485 system architectures.
What is the fail-safe feature of the AM26LS33ACDR and does the AM26LS31CDG4 have an equivalent?
The AM26LS33ACDR includes a fail-safe input threshold that ensures a known high output state when the differential inputs are open or undriven. The AM26LS31CDG4 is a driver and does not incorporate a receiver fail-safe function; its outputs are controlled by the input logic and enable pins.