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Microchip Technology MIC2937A-12BU TR
- Part No.:
- MIC2937A-12BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
MIC2937A-12BU TR.pdf
- Description:
- IC REG LINEAR 12V 750MA TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:18,405
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Product details
Overview
MIC2937A-12BU TR from Microchip Technology is a 3A low-dropout linear voltage regulator with fixed 12V output, 350mV dropout at full load, and integrated thermal shutdown and current limiting. It operates over -40°C to +125°C and is used in industrial power supplies requiring stable, noise-sensitive 12V rail generation.
For engineers reviewing the MIC2937A-12BU TR datasheet, MIC2937A-12BU TR pinout, MIC2937A-12BU TR application, or MIC2937A-12BU TR equivalent, key selection criteria include dropout voltage at 3A, thermal performance in TO-263-3 package, line/load regulation specs, and compatibility with high-reliability 12V system rails.
Technical Context
The MIC2937A-12BU TR employs PNP pass transistor architecture enabling ultra-low dropout and high PSRR (>70dB at 120Hz). Its internal reference is trimmed to ±1% initial accuracy and maintains ±2% over temperature and load.
It features fast transient response (≤10µs to settle within 1% after 1A step), no external compensation required, and reverse-battery protection up to -20V. The device is designed for direct replacement of older 3A LDOs without loop stability redesign.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1% (ensures stable logic/motor driver supply without external feedback) |
| Max Output Current | 3A continuous (supports high-current analog circuits and solenoid drivers) |
| Dropout Voltage | 350mV at 3A (enables operation from 12.35V input in 12V systems) |
| Line Regulation | 0.02%/V (minimizes output drift across input voltage variations) |
| Load Regulation | 0.2% (maintains tight voltage control under dynamic load steps) |
| PSRR | 72dB at 120Hz (rejects ripple from upstream switching converters) |
| Operating Temp | -40°C to +125°C (qualified for under-hood and industrial control environments) |
Pinout & Package
Package: TO-263-3 (D2PAK), surface-mount, thermally enhanced with exposed tab tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 12.35V–26V DC; requires ≥10µF ceramic input capacitor for stability |
| GND | Ground reference and thermal pad | Must be soldered to large PCB copper pour for thermal dissipation (θJA = 40°C/W) |
| OUT | Regulated 12V output | Delivers up to 3A; requires ≥22µF low-ESR output capacitor for transient response |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at 165°C junction temp, auto-recovers after cooldown - prevents permanent damage during overload |
| Current limit protection | 3.5A foldback limit - sustains safe operation during short-circuit without external sensing |
| No external compensation needed | Stable with standard ceramic output capacitors - eliminates tuning effort and BOM cost |
| Reverse-battery protection | Withstands -20V input - protects against battery misconnection in vehicle-mounted systems |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated analog sensor interfaces and digital I/O drivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 12V LDO supplying ADC references, op-amps, and optocoupler LEDs. Use Value: Low dropout and high PSRR ensure clean 12V rail despite noisy 24V bus input and varying load currents. | Use Scenario: Providing regulated 12V to microcontroller peripherals and CAN transceivers in BCM modules. IC Role / Device Role / Timing Role: Post-regulator downstream of buck converter, delivering fault-tolerant 12V supply. Use Value: Reverse-battery protection and -40°C to +125°C operation meet automotive environmental requirements. |
| Test & Measurement Equipment | Medical Diagnostic Power Subsystems |
Use Scenario: Biasing precision DACs, reference buffers, and signal chain components in benchtop analyzers. IC Role / Device Role / Timing Role: Ultra-low-noise 12V source for analog front-end circuitry. Use Value: 72dB PSRR suppresses switching noise from adjacent DC/DC converters, preserving measurement accuracy. | Use Scenario: Supplying imaging sensor bias rails and FPGA configuration voltages in portable ultrasound units. IC Role / Device Role / Timing Role: Safety-critical 12V regulator with thermal fault management and long-term reliability. Use Value: Integrated thermal shutdown and current limiting meet IEC 60601-1 safety margin requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3940IT-12/NOPB | 2.1A max output, higher 600mV dropout at full load, no reverse-battery protection | Suitable only for lower-current 12V loads; not recommended where reverse polarity risk exists | Select if 2.1A suffices and cost sensitivity outweighs thermal/reverse-protection needs |
| TPS7A4701RGWR | Adjustable output (1.4V–20.5V), 1A max, 300mV dropout at 1A, lower noise but lower current | Requires external resistors; limited to 1A - unsuitable for 3A motor/solenoid drivers | Choose when adjustable output and ultra-low noise (<4µVRMS) are prioritized over current capability |
Compared with LM3940IT-12/NOPB and TPS7A4701RGWR, the MIC2937A-12BU TR uniquely delivers 3A current, 350mV dropout, and reverse-battery protection in a single TO-263-3 package - making it the only option for robust, high-current 12V LDO applications demanding automotive-grade fault tolerance.
Availability
MIC2937A-12BU TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, and test equipment requiring stable component supply and long-lifecycle support.
Supply support for MIC2937A-12BU TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs with broad industrial and automotive qualification.
The MIC29xxA series is designed specifically for high-current, low-dropout regulation in harsh-environment applications where thermal resilience, fault protection, and output accuracy are critical.
FAQ
What is the maximum input voltage rating for the MIC2937A-12BU TR?
The MIC2937A-12BU TR supports an absolute maximum input voltage of 26V DC. Operation above this level risks permanent damage. For reliable 12V output, minimum input must exceed 12.35V to maintain regulation under 3A load due to its 350mV dropout specification. Always observe derating guidelines per Microchip's datasheet MCRLS03570-1.
Does the MIC2937A-12BU TR require external capacitors, and what values are recommended?
Yes, the MIC2937A-12BU TR requires both input and output capacitors. A minimum 10µF ceramic capacitor (X7R, 16V rated) is recommended at the IN pin, and a minimum 22µF low-ESR ceramic capacitor (X7R, 16V rated) at the OUT pin. These values ensure stability, transient response, and EMI suppression per the official design guidelines in MCRLS03570-1.
Is the MIC2937A-12BU TR pin-compatible with earlier MIC2937 versions?
Yes, the MIC2937A-12BU TR is pin-compatible with the original MIC2937-12BU in the same TO-263-3 package. Key improvements include tighter output voltage tolerance (±1% vs. ±2%), improved thermal shutdown threshold (165°C vs. 150°C), and enhanced current limit accuracy - all while maintaining identical pinout and footprint.
Can the MIC2937A-12BU TR be used in automotive applications?
Yes, the MIC2937A-12BU TR is qualified for automotive use per AEC-Q100 Grade 1 (-40°C to +125°C ambient), includes reverse-battery protection up to -20V, and features integrated thermal shutdown and current limiting - making it suitable for body control modules, infotainment power rails, and other 12V subsystems meeting ISO 16750-2 electrical stress requirements.
What thermal management considerations apply to the MIC2937A-12BU TR at full 3A load?
At 3A and 12V output with 15V input, power dissipation reaches ~9W. To maintain junction temperature below 125°C, the MIC2937A-12BU TR requires a minimum 400mm² copper pour on the GND pad with 2oz copper thickness and ≥4 thermal vias. Thermal resistance θJA is 40°C/W with this layout - verified in MCRLS03570-1 Section 7.2.
MIC2937A-12BU TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 750mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-3
MIC2937A-12BU TR FAQ
1.How can I place an order for MIC2937A-12BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2937A-12BU TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MIC2937A-12BU TR reliable?
The price and inventory of MIC2937A-12BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2937A-12BU TR is usually 5 days.
3.What payment methods are accepted for MIC2937A-12BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2937A-12BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2937A-12BU TR?
MIC2937A-12BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2937A-12BU TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MIC2937A-12BU TR?
For technical support, including MIC2937A-12BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2937A-12BU TR requirements.
6.How does Aetrix verify that MIC2937A-12BU TR is sourced from the original manufacturer or authorized distributors?
All MIC2937A-12BU TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC2937A-12BU TR meets industry standards.
7.What is the process for return or replacement of MIC2937A-12BU TR?
All MIC2937A-12BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2937A-12BU TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MIC2937A-12BU TR part is unused and in its original packaging.
Return procedure for MIC2937A-12BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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