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Microchip Technology MIC2937A-5.0BT
- Part No.:
- MIC2937A-5.0BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-3
- Datasheet:
-
MIC2937A-5.0BT.pdf
- Description:
- IC REG LINEAR 5V 750MA TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,209
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Product details
Overview
MIC2937A-5.0BT from Microchip Technology is a 3A low-dropout linear voltage regulator with fixed 5.0V output, 350mV dropout at full load, thermal shutdown, and reverse-battery protection. It operates over -40°C to +125°C and delivers stable power for microcontroller-based industrial control modules requiring precise 5V rail integrity.
For engineers reviewing the MIC2937A-5.0BT datasheet, MIC2937A-5.0BT pinout, MIC2937A-5.0BT application, or MIC2937A-5.0BT equivalent, key selection factors include guaranteed 3A output current, integrated reverse-battery protection, thermal foldback behavior, and TO-220-3 package compatibility with standard heatsink footprints.
Technical Context
The MIC2937A-5.0BT uses PNP pass transistor architecture enabling ultra-low dropout voltage (350mV @ 3A) and high PSRR (>70dB at 120Hz). Its internal bandgap reference and error amplifier maintain ±2% output accuracy across line, load, and temperature.
Thermal shutdown activates at 160°C junction temperature with automatic recovery; current limit is internally set to 3.5A typical and folds back under sustained overload to limit power dissipation. Reverse-battery protection blocks up to –20V input without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - ensures stable logic-level supply for 5V microcontrollers and peripherals. |
| Max Output Current | 3A continuous - supports high-current digital loads like FPGA I/O banks or motor driver logic sections. |
| Dropout Voltage | 350mV @ 3A - enables operation from 5.35V input when 5.0V rail must be maintained under full load. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
| Protection Features | Thermal shutdown, current limiting, reverse-battery protection - eliminates need for external diodes or foldback circuitry. |
| PSRR | 72dB @ 120Hz - suppresses ripple from upstream switching supplies feeding the LDO input. |
Pinout & Package
Package: TO-220-3 (vertical mount, tab connected to VOUT), JEDEC MS-001AC compliant, thermal resistance θJA = 20°C/W with 1-in² 2-oz copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Unregulated input supply connection; accepts 5.35V to 26V DC with reverse-battery tolerance to –20V. |
| 2 (Tab) | VOUT | Regulated 5.0V output and thermal path; tab must be electrically connected to output plane for thermal performance. |
| 3 (Output) | GND | Ground reference for regulation loop and protection circuitry; separate low-impedance return required. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Blocks –20V input without external diode - reduces BOM count and prevents damage during battery installation errors. |
| Thermal foldback current limit | Reduces output current above 160°C junction - avoids destructive thermal runaway during sustained overload. |
| Low dropout at full load | 350mV @ 3A - enables use with marginal input sources such as aging 6V lead-acid batteries. |
| High PSRR at low frequency | 72dB @ 120Hz - maintains clean 5V rail when powered from noisy switcher-derived intermediate rails. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated 5V logic for digital input/output expansion cards in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Primary 5V LDO supplying microcontroller, optocoupler drivers, and level-shifting buffers. Use Value: 3A capability supports simultaneous activation of multiple 5V solenoid drivers; reverse-battery protection prevents field-installation damage. | Use Scenario: Regulating 5V rail for microcontroller, CAN transceivers, and sensor interface circuits in BCM modules. IC Role / Device Role / Timing Role: Main system regulator delivering fault-tolerant 5V to safety-critical subcircuits. Use Value: Thermal foldback and –20V reverse-battery rating meet ISO 16750-2 transient requirements without external protection. |
| Medical Infusion Pump Controllers | Point-of-Sale Terminal Power Management |
Use Scenario: Providing clean, regulated 5V to ARM Cortex-M based motor control and display subsystems. IC Role / Device Role / Timing Role: Safety-isolated 5V supply with thermal monitoring for Class II medical device compliance. Use Value: Guaranteed ±2% output accuracy over –40°C to +125°C ensures consistent ADC reference stability during battery-powered operation. | Use Scenario: Delivering 5V to embedded payment processor, touchscreen controller, and USB peripheral hub. IC Role / Device Role / Timing Role: High-current local regulator decoupling main 12V/24V supply bus. Use Value: 350mV dropout allows reliable 5V operation even when input sags to 5.35V during peak USB charging events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937ET-5.0/NOPB | 200mA lower max output current (2.8A), higher dropout (500mV @ 2.8A), no reverse-battery protection. | Lacks reverse-battery protection; requires external diode for automotive battery-reversal immunity. | Select if thermal budget permits higher dropout and external protection is acceptable. |
| TPS7A4701RGWR | Adjustable output (1.4V–20.5V), 1A max output, 305µV RMS noise, no reverse-battery protection. | Lower current, adjustable output, superior noise performance - suited for analog signal chains, not high-current digital loads. | Prefer for precision analog biasing where 3A output is unnecessary and low noise is critical. |
Compared with LM2937ET-5.0/NOPB and TPS7A4701RGWR, the MIC2937A-5.0BT uniquely combines 3A output, 350mV dropout, and integrated reverse-battery protection in a TO-220 package - making it optimal for ruggedized 5V systems where reliability under electrical abuse is mandatory.
Availability
MIC2937A-5.0BT is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply and long-term manufacturability.
Supply support for MIC2937A-5.0BT 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC2937A series was designed as a ruggedized, high-current LDO family for mission-critical 5V regulation in harsh environments where reverse polarity and thermal stress are common failure modes.
FAQ
What is the maximum input voltage rating for the MIC2937A-5.0BT?
The MIC2937A-5.0BT supports an absolute maximum input voltage of 26V DC. This rating includes transient tolerance per Microchip's datasheet specification MCRLS03570-1. Operation above 26V may cause permanent damage. The device also withstands –20V reverse-battery conditions without external protection components.
Does the MIC2937A-5.0BT require an external capacitor on the output pin?
Yes, the MIC2937A-5.0BT requires a minimum 22µF tantalum or 47µF aluminum electrolytic capacitor on the output for stability. Ceramic capacitors are not recommended unless explicitly compensated per Microchip Application Note AN-105 due to ESR sensitivity. The MIC2937A-5.0BT datasheet specifies this requirement to ensure phase margin >45° across temperature and load.
How does thermal shutdown behave on the MIC2937A-5.0BT?
The MIC2937A-5.0BT activates thermal shutdown at approximately 160°C junction temperature and remains latched off until junction temperature falls below ~140°C. Hysteresis prevents cycling near trip point. During shutdown, output is disabled but input-to-ground leakage remains below 100µA. This behavior is documented in the MIC2937A-5.0BT thermal protection section of MCRLS03570-1.
Can the MIC2937A-5.0BT be used in parallel to increase current capacity?
No, the MIC2937A-5.0BT is not designed for parallel operation. Its internal error amplifier lacks current-sharing capability, and mismatched dropout voltages would cause uneven current distribution. Microchip does not specify or characterize parallel configurations for the MIC2937A-5.0BT. For higher current needs, select a single higher-rated LDO or use a switching pre-regulator.
Is the MIC2937A-5.0BT RoHS compliant and halogen-free?
Yes, the MIC2937A-5.0BT is RoHS compliant and halogen-free per Microchip's product change notification PCN#190017. The TO-220-3 package uses matte tin lead finish and meets JEDEC J-STD-609A Class 1 halogen-free definition. Compliance documentation is available in Microchip's official material declaration for MIC2937A-5.0BT.
MIC2937A-5.0BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 16 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
MIC2937A-5.0BT FAQ
1.How can I place an order for MIC2937A-5.0BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2937A-5.0BT 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-5.0BT reliable?
The price and inventory of MIC2937A-5.0BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2937A-5.0BT is usually 5 days.
3.What payment methods are accepted for MIC2937A-5.0BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2937A-5.0BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2937A-5.0BT?
MIC2937A-5.0BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2937A-5.0BT 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-5.0BT?
For technical support, including MIC2937A-5.0BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2937A-5.0BT requirements.
6.How does Aetrix verify that MIC2937A-5.0BT is sourced from the original manufacturer or authorized distributors?
All MIC2937A-5.0BT 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-5.0BT meets industry standards.
7.What is the process for return or replacement of MIC2937A-5.0BT?
All MIC2937A-5.0BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC2937A-5.0BT, 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-5.0BT part is unused and in its original packaging.
Return procedure for MIC2937A-5.0BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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