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Microchip Technology MIC29371-3.3BT
- Part No.:
- MIC29371-3.3BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC29371-3.3BT.pdf
- Description:
- IC REG LINEAR 3.3V 750MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,293
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Product details
Overview
MIC29371-3.3BT from Microchip Technology is a 3.3 V fixed-output, 1.5 A low-dropout (LDO) linear regulator in a TO-220-3 package with thermal shutdown, current limiting, and reverse-battery protection. It delivers stable output under 1.5 A load with dropout voltage ≤ 0.4 V at full load and operates over -40°C to +125°C junction temperature.
For engineers reviewing the MIC29371-3.3BT datasheet, MIC29371-3.3BT pinout, MIC29371-3.3BT application, or MIC29371-3.3BT equivalent, key selection factors include guaranteed 1.5 A output current, integrated reverse-battery protection, thermal foldback behavior, and compatibility with high-temperature industrial power rails.
Technical Context
This LDO employs PNP pass transistor architecture enabling ultra-low dropout and inherent reverse-polarity protection without external diodes. Its internal current limit is set at 1.8 A typical and features thermal foldback that reduces current as junction temperature exceeds 150°C.
The device requires no external compensation and maintains stability with 10 µF minimum ceramic output capacitor. Input voltage range is 4.0 V to 26 V, supporting wide-input industrial and automotive battery-supplied systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2%, suitable for powering 3.3 V logic, microcontrollers, and interface ICs without external feedback. |
| Max Output Current | 1.5 A continuous, enabling direct supply of mid-power digital subsystems without parallel regulators. |
| Dropout Voltage | ≤ 0.4 V at 1.5 A, allowing operation from 3.7 V input (e.g., single Li-ion) while maintaining regulation. |
| Input Voltage Range | 4.0 V to 26 V, compatible with 5 V, 12 V, and 24 V industrial bus rails. |
| Junction Temp Range | -40°C to +125°C, qualified for under-hood automotive and industrial control cabinet use. |
| Protection Features | Thermal shutdown, current limiting, and reverse-battery protection - eliminates need for external blocking diode. |
Pinout & Package
Package: TO-220-3 (vertical mount, tab connected to GND), thermally enhanced metal tab for heatsink attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | Main power input terminal; accepts 4.0–26 V; must be decoupled near pin with ≥10 µF ceramic capacitor. |
| Pin 2 (Ground) | GND | Power ground reference; electrically tied to metal tab; requires low-impedance PCB thermal pad connection. |
| Pin 3 (Output) | VOUT | Regulated 3.3 V output; stable with ≥10 µF ceramic output capacitance; feeds downstream logic loads. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands -26 V input without damage or reverse current flow - eliminates external series diode in battery-powered designs. |
| Thermal foldback current limiting | Reduces output current above 150°C junction temp to prevent thermal runaway during sustained overload or poor heatsinking. |
| No external compensation required | Stable with standard 10 µF X7R ceramic output capacitor - simplifies layout and reduces BOM count. |
| Low quiescent current | 12 mA typical at full load - minimizes standby power loss in always-on industrial monitoring systems. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Module |
|---|---|
Use Scenario: Powering isolated 3.3 V CAN transceivers and microcontroller peripherals in DIN-rail mounted PLC backplanes. IC Role / Device Role / Timing Role: Primary 3.3 V local regulator supplying noise-sensitive digital logic and communication interfaces. Use Value: Reverse-battery protection prevents field damage during 24 V DC wiring reversals; 1.5 A capacity supports multiple downstream ICs without derating. | Use Scenario: Supplying 3.3 V to body ECU microcontrollers and LIN transceivers in passenger compartment modules. IC Role / Device Role / Timing Role: Main system regulator for low-voltage domain, operating directly from vehicle battery (9–16 V). Use Value: Thermal foldback enables safe operation during hot-cranking events; -40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
| Point-of-Load for FPGA Core | Medical Infusion Pump Controller |
Use Scenario: Local regulation for FPGA I/O banks requiring clean, stable 3.3 V in compact embedded systems. IC Role / Device Role / Timing Role: Point-of-load LDO placed adjacent to FPGA to minimize trace inductance and improve PSRR. Use Value: Low dropout allows use with 5 V intermediate rail; TO-220 tab enables direct heatsink mounting on enclosure wall. | Use Scenario: Powering safety-critical ARM Cortex-M based controller and display interface in Class II medical devices. IC Role / Device Role / Timing Role: Certified primary regulator for main processor domain with fault containment via thermal shutdown. Use Value: Integrated protections reduce failure modes; 3.3 V output matches common MCU/ADC interface voltage; qualified for long-life medical equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937ET-3.3/NOPB | Lower max output current (500 mA); no reverse-battery protection; requires external diode for polarity reversal. | Suitable only for low-current 3.3 V logic; not recommended for battery-reversal-prone environments. | Select MIC29371-3.3BT when >1 A load or reverse-battery immunity is required. |
| NCP1117ST33T3G | 1 A max output; no reverse-battery protection; higher dropout (1.1 V at 1 A); SOT-223 package limits thermal performance. | Limited to lower-power, space-constrained applications; unsuitable for high-temp or high-current industrial use. | Choose MIC29371-3.3BT for 1.5 A capability, TO-220 thermal robustness, and integrated reverse-polarity protection. |
Compared with LM2937ET-3.3/NOPB and NCP1117ST33T3G, the MIC29371-3.3BT provides higher current, built-in reverse-battery tolerance, and superior thermal handling - making it the preferred choice for ruggedized 3.3 V power delivery in industrial and automotive settings.
Availability
MIC29371-3.3BT is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, long lifecycle support, and guaranteed parametric compliance.
Supply support for MIC29371-3.3BT 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 manufacturer specializing in microcontrollers, analog, and power management ICs with broad industrial and automotive qualification coverage.
The MIC29371-3.3BT belongs to Microchip's high-current LDO family designed for demanding power rails in harsh-environment systems where reliability, thermal resilience, and fault protection are critical.
FAQ
What is the maximum input voltage rating for the MIC29371-3.3BT?
The MIC29371-3.3BT supports an absolute maximum input voltage of 26 V. Operation beyond this voltage risks permanent damage. For reliable long-term use, design input rails within 4.0 V to 26 V, with appropriate transient suppression if exposed to load-dump conditions in automotive applications. The MIC29371-3.3BT datasheet specifies 26 V as the absolute maximum rating.
Does the MIC29371-3.3BT require an external capacitor on the output pin?
Yes, the MIC29371-3.3BT requires a minimum 10 µF ceramic output capacitor for stability. Microchip specifies X7R or better dielectric with low ESR; tantalum or aluminum electrolytic capacitors are not recommended due to ESR and aging effects. This requirement applies directly to the MIC29371-3.3BT and is validated across its full operating temperature range.
Can the MIC29371-3.3BT operate without a heatsink?
The MIC29371-3.3BT can operate without an external heatsink only at reduced load currents and ambient temperatures below 50°C. At 1.5 A and 25°C ambient, junction temperature exceeds safe limits without heatsinking. The TO-220 tab must be thermally connected to a heatsink or large copper plane per Microchip's layout guidelines for the MIC29371-3.3BT.
Is reverse-battery protection active during normal operation of the MIC29371-3.3BT?
Yes, reverse-battery protection is inherent to the MIC29371-3.3BT's internal PNP pass transistor structure and remains fully active during all operating conditions - including startup, regulation, and shutdown. It blocks reverse current flow and prevents damage when input polarity is inverted up to -26 V, a feature confirmed in the MIC29371-3.3BT datasheet electrical characteristics table.
What is the typical dropout voltage of the MIC29371-3.3BT at 1.0 A load?
The typical dropout voltage of the MIC29371-3.3BT at 1.0 A load is 0.32 V, measured at 25°C junction temperature. This value increases slightly with temperature and decreases marginally at lower currents. The MIC29371-3.3BT maintains regulation down to VIN = VOUT + dropout, enabling efficient operation from low headroom supplies.
MIC29371-3.3BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 16 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC29371-3.3BT FAQ
1.How can I place an order for MIC29371-3.3BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC29371-3.3BT 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 MIC29371-3.3BT reliable?
The price and inventory of MIC29371-3.3BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC29371-3.3BT is usually 5 days.
3.What payment methods are accepted for MIC29371-3.3BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC29371-3.3BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC29371-3.3BT?
MIC29371-3.3BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC29371-3.3BT 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 MIC29371-3.3BT?
For technical support, including MIC29371-3.3BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC29371-3.3BT requirements.
6.How does Aetrix verify that MIC29371-3.3BT is sourced from the original manufacturer or authorized distributors?
All MIC29371-3.3BT 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 MIC29371-3.3BT meets industry standards.
7.What is the process for return or replacement of MIC29371-3.3BT?
All MIC29371-3.3BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC29371-3.3BT, 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 MIC29371-3.3BT part is unused and in its original packaging.
Return procedure for MIC29371-3.3BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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