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LM2694SD Equivalent & Substitute Parts
Part Overview
The LM2694SD is a buck switching regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 600mA output current with an adjustable voltage range from 2.5V to 24V, operating from an 8V to 30V input supply. The device is housed in a 10-WFDFN exposed pad surface mount package.
The LM2694SD is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Function | Step-Down (Buck) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 8V |
| Voltage - Input (Max) | 30V |
| Voltage - Output (Min/Fixed) | 2.5V |
| Voltage - Output (Max) | 24V |
| Current - Output | 600mA |
| Frequency - Switching | 1MHz |
| Synchronous Rectifier | No |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | 10-WFDFN Exposed Pad |
| Supplier Device Package | 10-WSON (3x3) |
Substitute Part Grouping Explanation
Substitution for the LM2694SD is determined by strict equivalence across the following critical parameters:
- Function: Step-Down (Buck) topology
- Output Configuration: Positive adjustable output
- Voltage specifications: 8V–30V input, 2.5V–24V adjustable output
- Current rating: 600mA output capability
- Switching frequency: 1MHz
- Package: 10-WFDFN Exposed Pad (10-WSON 3x3)
- Operating temperature range: -40°C to 125°C
The LM2694SD/NOPB is a direct manufacturer equivalent from Texas Instruments. It maintains identical electrical specifications and package configuration while differing in product status and packaging format.
Parameter Comparison
| Parameter | LM2694SD | LM2694SD/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Function | Step-Down | Step-Down |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Number of Outputs | 1 | 1 |
| Voltage - Input (Min) | 8V | 8V |
| Voltage - Input (Max) | 30V | 30V |
| Voltage - Output (Min/Fixed) | 2.5V | 2.5V |
| Voltage - Output (Max) | 24V | 24V |
| Current - Output | 600mA | 600mA |
| Frequency - Switching | 1MHz | 1MHz |
| Synchronous Rectifier | No | No |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 10-WFDFN Exposed Pad | 10-WFDFN Exposed Pad |
| Supplier Device Package | 10-WSON (3x3) | 10-WSON (3x3) |
| Product Status | Obsolete | Active |
| Packaging Format | Bulk | Tape & Reel (TR) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The LM2694SD/NOPB is the direct equivalent for the obsolete LM2694SD. Both parts share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility.
The LM2694SD/NOPB is recommended for new designs and ongoing production due to its active product status. This part is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the original LM2694SD is RoHS non-compliant.
The LM2694SD/NOPB is supplied in Tape & Reel (TR) packaging format, which is standard for automated assembly operations. The original LM2694SD was supplied in bulk format.
Both parts are manufactured by Texas Instruments and carry identical base product number LM2694, confirming their equivalence within the product family.
Frequently Asked Questions (FAQ)
Q: Can the LM2694SD/NOPB be used as a direct replacement for the LM2694SD?
A: Yes. The LM2694SD/NOPB is electrically and mechanically identical to the LM2694SD. All electrical parameters, package dimensions, and pin configurations are equivalent. The primary differences are product status (active vs. obsolete) and packaging format (Tape & Reel vs. bulk).
Q: What is the difference between LM2694SD and LM2694SD/NOPB?
A: The "/NOPB" suffix indicates the part is supplied in Tape & Reel packaging without plating on the leads. The LM2694SD/NOPB is the active production variant with ROHS3 compliance, while the LM2694SD is obsolete and RoHS non-compliant. Electrical specifications are identical.
Q: Are there any compatibility concerns when substituting the LM2694SD with LM2694SD/NOPB?
A: No compatibility concerns exist. The 10-WFDFN Exposed Pad package, pin configuration, and electrical characteristics are identical. PCB layouts and circuit designs require no modification.
Q: What is the 10-WSON (3x3) package specification?
A: The 10-WSON (3x3) is a 10-lead Wafer-Scale Chip-Scale Package with 3mm × 3mm body dimensions. It is a surface mount package with an exposed thermal pad for enhanced heat dissipation. This package is suitable for automated pick-and-place assembly.
Q: Why is the LM2694SD marked as obsolete?
A: The LM2694SD has been superseded by the LM2694SD/NOPB, which offers improved compliance status and active manufacturing support. Texas Instruments continues to produce the LM2694 family through the active LM2694SD/NOPB variant.
Q: Can the LM2694SD/NOPB handle the same input and output voltage ranges?
A: Yes. The LM2694SD/NOPB operates identically across the 8V–30V input range and supports the full 2.5V–24V adjustable output range. Operating temperature range is -40°C to 125°C for both variants.
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