LM2937ES-3.3 Equivalent & Substitute Parts

Part Overview

The LM2937ES-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 500mA in a TO-263 (DDPAK-3) surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 3.3V regulation in the 500mA to 3A output range.

Substiute Parts

LM2937ES-3.3

Texas InstrumentsIn Stock: 61969LM2937ES-3.3 Datasheet

Current PartRFQ

LM2937ES-3.3/NOPB

Texas InstrumentsIn Stock: 52893LM2937ES-3.3/NOPB Datasheet

DirectRFQ

MIC29150-3.3WU

Microchip TechnologyIn Stock: 10176MIC29150-3.3WU Datasheet

MFR RecommendedRFQ

MIC29150-3.3WU-TR

Microchip TechnologyIn Stock: 19779MIC29150-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC29300-3.3WU

Microchip TechnologyIn Stock: 27406MIC29300-3.3WU Datasheet

MFR RecommendedRFQ

MIC29300-3.3WU-TR

Microchip TechnologyIn Stock: 22912MIC29300-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC2937A-3.3WU

Microchip TechnologyIn Stock: 2202MIC2937A-3.3WU Datasheet

MFR RecommendedRFQ

MIC2937A-3.3WU-TR

Microchip TechnologyIn Stock: 5222MIC2937A-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC5237-3.3YU

Microchip TechnologyIn Stock: 4039MIC5237-3.3YU Datasheet

MFR RecommendedRFQ

MIC5237-3.3YU-TR

Microchip TechnologyIn Stock: 763MIC5237-3.3YU-TR Datasheet

MFR RecommendedRFQ

NCV1117DT33T5G

onsemiIn Stock: 63730NCV1117DT33T5G Datasheet

MFR RecommendedRFQ

TC1262-3.3VEBTR

Microchip TechnologyIn Stock: 4245TC1262-3.3VEBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2937ES-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package Type: Must be TO-263-4 (D2PAK) for mechanical and thermal compatibility
• Output Current Capability: Minimum 500mA; higher ratings (750mA, 1A, 1.5A, 3A) are acceptable for drop-in replacement
• Input Voltage Range: Maximum 16V to 26V acceptable
• Operating Temperature: -40°C to 125°C minimum
• Mounting Type: Surface mount only
• Regulatory Compliance: ROHS3 compliant

Substitute parts are grouped into three categories based on output current capability:

1. Direct Equivalents (500mA): LM2937ES-3.3/NOPB, MIC5237-3.3YU, MIC5237-3.3YU-TR
2. Higher Current Alternatives (750mA to 1.5A): MIC2937A-3.3WU, MIC2937A-3.3WU-TR, MIC29150-3.3WU, MIC29150-3.3WU-TR
3. High Current Alternatives (3A): MIC29300-3.3WU, MIC29300-3.3WU-TR

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Same Current Rating): LM2937ES-3.3/NOPB is the primary direct equivalent from Texas Instruments with Active product status. This part maintains identical electrical specifications and is available in higher quantities (52,788 pcs). For applications requiring the exact 500mA specification, MIC5237-3.3YU and MIC5237-3.3YU-TR from Microchip Technology are functionally equivalent with lower maximum input voltage (16V vs 26V).

Higher Current Alternatives (Backward Compatible): MIC2937A-3.3WU series (750mA), MIC29150-3.3WU series (1.5A), and MIC29300-3.3WU series (3A) are pin-compatible drop-in replacements in TO-263-4 packaging. These parts support higher output currents while maintaining the same 3.3V output and operating temperature range. All Microchip alternatives carry Active product status and ROHS3 compliance.

Packaging Considerations: Tube packaging is suitable for lower-volume applications and manual assembly. Cut Tape & Digi-Reel and Tape & Reel packaging options are available for automated production environments. The NCV1117DT33T5G from onsemi uses DPAK (TO-252-3) packaging, which is not pin-compatible with TO-263-4 and requires PCB redesign.

Compliance & Availability: All recommended substitutes maintain ROHS3 compliance and MSL-3 moisture sensitivity rating. The LM2937ES-3.3/NOPB offers the highest inventory availability (52,788 pcs). Microchip alternatives provide robust supply with multiple packaging options and higher current ratings for future design margin.

Frequently Asked Questions (FAQ)

Q: Can I use MIC29150-3.3WU as a direct replacement for LM2937ES-3.3? A: Yes. MIC29150-3.3WU is pin-compatible in TO-263-4 packaging and delivers 3.3V output. It provides higher current capability (1.5A vs 500mA) and lower dropout voltage (0.6V vs 1V), making it a suitable drop-in replacement. No PCB modifications are required.

Q: What is the difference between MIC2937A-3.3WU and MIC2937A-3.3WU-TR? A: Both parts are electrically identical with 750mA output current. The primary difference is packaging: MIC2937A-3.3WU is supplied in Tube format for manual assembly, while MIC2937A-3.3WU-TR is supplied in Tape & Reel format for automated pick-and-place assembly.

Q: Why is the NCV1117DT33T5G listed as a substitute if it uses different packaging? A: NCV1117DT33T5G uses TO-252-3 (DPAK) packaging instead of TO-263-4. While electrically compatible for 3.3V regulation, it requires PCB redesign due to different pin layout and thermal characteristics. It is not a true drop-in replacement.

Q: Can I use MIC5237-3.3YU if my input voltage exceeds 16V? A: No. MIC5237-3.3YU has a maximum input voltage rating of 16V, compared to 26V for the LM2937ES-3.3. For applications with input voltages between 16V and 26V, use MIC2937A, MIC29150, or MIC29300 series instead.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL-3 moisture sensitivity rating, matching the original LM2937ES-3.3 specifications.

Q: What is the advantage of higher current-rated parts like MIC29300-3.3WU? A: Higher current ratings provide design margin for future load increases and improved thermal performance under sustained operation. The MIC29300-3.3WU (3A) offers lower dropout voltage (0.6V) compared to the original part (1V), reducing power dissipation and heat generation.