Part A
AM26LS33ACDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1505 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The AM26LS33ACDR and AM26LS32ACNSRG4 are both quad differential line receivers from the same AM26LS32A/33A family, sharing identical channel count, supply voltage range, and operating temperature range, making them functionally interchangeable in most designs. The primary distinction lies in the output stage configuration and package footprint, so the AM26LS33ACDR can serve as a functional replacement candidate for the AM26LS32ACNSRG4 provided the output structure and board layout are validated against the target application.
Channel Count
High match
Supply Voltage Range
High match
Output Type
Validation required
Package Type
Validation required
Parts at a glance
Part B
AM26LS32ACNSRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7377 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 | AM26LS33ACDR | AM26LS32ACNSRG4 | Why it matters |
|---|---|---|---|
| Function | Quadruple differential line receiver | Quadruple differential line receiver | Both are quad differential line receivers, so the core function is the same; this confirms basic functional substitutability. |
| Receiver Input Sensitivity | ±500 mV | ±200 mV | The AM26LS33A has higher guaranteed sensitivity threshold (±500 mV) than the AM26LS32A (±200 mV), affecting the minimum differential signal the receiver can reliably detect. |
| Input Hysteresis | 50 mV (typ) | 50 mV (typ) | Hysteresis improves noise immunity; both devices specify similar typical hysteresis, so noise margin behavior is comparable. |
| Fail-Safe Output (Open Inputs) | Yes (high output on open inputs) | No guaranteed fail-safe | The AM26LS33A provides a defined output when inputs are open, while the AM26LS32A does not guarantee this; this affects behavior in fault or disconnected conditions. |
| Supply Voltage Range | 4.75 V to 5.25 V | 4.75 V to 5.25 V | Both operate from a standard 5 V supply with the same tolerance, so power supply compatibility is identical. |
| Number of Receivers | 4 | 4 | Both integrate four independent receivers, matching channel count for multi-line bus applications. |
| Output Type | 3-state (tri-state) outputs | 3-state (tri-state) outputs | Tri-state outputs allow bus sharing; both devices support this, so they are interchangeable in shared-bus architectures. |
| Package / Mounting | SOIC-16 (surface mount) | SOIC-16 (surface mount) | Identical package and mounting style ensure footprint compatibility on the PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges mean both are suitable for the same environmental conditions. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM26LS33ACDR | AM26LS32ACNSRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | Receiver | Receiver |
| Protocol | - | RS422, RS423 |
| Number of Drivers/Receivers | 0/4 | 0/4 |
| Receiver Hysteresis | 50 mV | 50 mV |
| 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 |
Frequently asked questions
What are the primary functional differences between the AM26LS33ACDR and the AM26LS32ACNSRG4?
Both devices are quad differential line receivers. The AM26LS33ACDR features a tri-state output with a fail-safe function that forces the outputs to a high logic state when the inputs are open or undriven. The AM26LS32ACNSRG4 is a standard quad differential line receiver without the fail-safe feature. Additionally, the AM26LS33ACDR is supplied in an SOIC-16 package, while the AM26LS32ACNSRG4 is supplied in an SOP-16 package.
Are the AM26LS33ACDR and AM26LS32ACNSRG4 pin-compatible?
Yes, both devices use the standard 16-pin quad differential line receiver pinout. However, the AM26LS33ACDR is in an SOIC-16 (D) package and the AM26LS32ACNSRG4 is in an SOP-16 (NS) package. The pin functions are identical, but the package body dimensions and PCB land patterns differ, so footprint compatibility must be verified against the respective datasheets.
What is the fail-safe function on the AM26LS33ACDR and does the AM26LS32ACNSRG4 have it?
The AM26LS33ACDR includes a fail-safe feature that ensures the receiver outputs are forced to a high logic level when the differential inputs are open, terminated, or undriven. The AM26LS32ACNSRG4 does not include this fail-safe function, so its output state under open or undriven input conditions is not guaranteed to be a defined logic level.
What are the recommended operating supply voltage and temperature ranges for these devices?
Both the AM26LS33ACDR and AM26LS32ACNSRG4 are specified for a single 5 V supply (nominal) and operate over the standard commercial temperature range of 0°C to 70°C. These parameters are consistent across both devices per their respective manufacturer datasheets.
Can the AM26LS33ACDR be used as a direct drop-in replacement for the AM26LS32ACNSRG4?
Not as a direct drop-in replacement without design review. Although the pin functions are identical, the AM26LS33ACDR adds a fail-safe feature that changes output behavior under open or undriven input conditions, and the package type differs (SOIC-16 vs SOP-16). The PCB land pattern and the system's response to the fail-safe behavior must be validated before substitution.
What differential input voltage range do these receivers support?
Both the AM26LS33ACDR and AM26LS32ACNSRG4 are designed to meet the electrical requirements of RS-422 and RS-423 differential data transmission standards, supporting differential input voltages within the range specified in their datasheets, typically ±7 V common-mode with differential sensitivity of ±200 mV. Designers should confirm the exact limits in the manufacturer datasheet for the specific grade.
What output configuration do these devices provide?
Both devices provide four independent differential line receivers with tri-state outputs. The tri-state capability allows the outputs to be placed in a high-impedance state via a common enable pin, which is useful for bus-oriented or multiplexed applications. This output structure is common to both the AM26LS33ACDR and AM26LS32ACNSRG4.