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Microchip Technology MIC29151-3.3BT
- Part No.:
- MIC29151-3.3BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC29151-3.3BT.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,269
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Product details
Overview
MIC29151-3.3BT from Microchip Technology is a high-current, low-dropout linear regulator IC delivering fixed 3.3 V output at up to 1.5 A, with dropout voltage of 350 mV at full load and thermal shutdown protection. It operates over input voltages from 4.0 V to 26 V and is used in industrial power rails for microcontroller core supply and FPGA I/O banks.
For engineers reviewing the MIC29151-3.3BT datasheet, MIC29151-3.3BT pinout, MIC29151-3.3BT application, or MIC29151-3.3BT equivalent, key selection criteria include guaranteed 1.5 A output current, ±2% output voltage accuracy over line/load/temperature, integrated reverse-battery protection, and TO-220-5 package thermal performance under sustained load.
Technical Context
The MIC29151-3.3BT uses a PNP pass transistor architecture enabling ultra-low dropout and inherent reverse-polarity protection without external components. Its internal bandgap reference and error amplifier maintain regulation across –40°C to +125°C junction temperature range.
It integrates thermal foldback and current limiting that dynamically reduce output current above safe junction temperature thresholds, preserving reliability in enclosed or high-ambient environments without requiring external thermal sensing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% (ensures stable core logic supply for ARM Cortex-M4/M7 MCUs) |
| Max Output Current | 1.5 A continuous (supports dual-rail SoC power domains without derating) |
| Dropout Voltage | 350 mV at 1.5 A (enables operation from 3.65 V min input, e.g., LiFePO₄ battery) |
| Input Voltage Range | 4.0 V to 26 V (compatible with 5 V, 12 V, and 24 V industrial bus rails) |
| Quiescent Current | 35 mA typical (low static consumption enables always-on monitoring circuits) |
| Thermal Shutdown | Activated at 165°C junction (prevents permanent damage during overload or airflow loss) |
Pinout & Package
Package: TO-220-5 (vertical mount, tab-connected to GND, 1.5 K/W junction-to-case thermal resistance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 4.0–26 V; requires ≥10 µF ceramic input capacitor for stability |
| GND | Ground reference | Common return path; electrically connected to metal tab for thermal conduction |
| OUT | Regulated output | Delivers 3.3 V ±2%; requires ≥22 µF low-ESR output capacitor |
| SENSE | Output voltage sense | Remote sensing point for precision regulation at load; tied to OUT if local sensing |
| SHDN | Shutdown control | Active-low enable; pulls low to disable regulator and reduce quiescent current to 10 µA |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands –26 V input without damage or reverse current flow, eliminating need for external blocking diode |
| Thermal foldback limiting | Reduces output current progressively above 140°C junction to prevent thermal runaway during sustained overload |
| Stable with ceramic output capacitors | Supports 22 µF X7R/X5R ceramics (no ESR requirement), reducing board area and cost vs. tantalum |
| Low noise output | 40 µVRMS output noise (10 Hz–100 kHz) enables clean analog sensor and ADC reference supply |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog input signal conditioning circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU peripherals and isolated CAN transceivers. Use Value: Reverse-battery tolerance eliminates fuse and diode protection, reducing BOM count by two components. | Use Scenario: Supplying infotainment system microcontrollers and touch controller ASICs in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Load-switched 3.3 V rail enabling controlled power-up sequencing and sleep-mode current reduction. Use Value: 10 µA shutdown current extends battery life during vehicle off-state beyond ISO 16750-2 requirements. |
| Medical Patient Monitoring Devices | Test & Measurement Equipment |
Use Scenario: Providing low-noise bias for ECG front-end amplifiers and ADC references in portable monitors. IC Role / Device Role / Timing Role: Precision analog supply rail decoupled from noisy digital subsystems. Use Value: 40 µVRMS output noise ensures <1 LSB error in 16-bit medical-grade ADC conversions. | Use Scenario: Powering FPGA configuration memory and high-speed serial transceivers in benchtop analyzers. IC Role / Device Role / Timing Role: Stable 3.3 V source for JTAG programming interfaces and LVDS clock distribution ICs. Use Value: 1.5 A output supports simultaneous configuration of multiple FPGA banks without voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2931T-3.3/NOPB | 100 mA max output, higher 600 mV dropout, no reverse-battery protection | Suitable only for low-power microcontrollers or sensors, not 1.5 A loads | Select MIC29151-3.3BT when >500 mA load current or reverse-voltage exposure is required. |
| TPS7A4701RGWR | 1 A max output, 310 mV dropout, ±0.5% accuracy, but no reverse-battery protection | Better accuracy/noise for precision analog, but lacks automotive-grade fault tolerance | Choose MIC29151-3.3BT for robustness in harsh environments where reverse connection risk exists. |
Compared with LM2931T-3.3/NOPB and TPS7A4701RGWR, the MIC29151-3.3BT uniquely combines 1.5 A capability, reverse-battery immunity, and industrial thermal resilience-making it the only option among the three qualified for unattended 24 V field equipment with manual wiring risk.
Availability
MIC29151-3.3BT is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MIC29151-3.3BT 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 company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC29151-3.3BT belongs to Microchip's high-reliability LDO family designed for mission-critical power rails where reverse polarity, thermal stress, and wide input voltage variation are common.
FAQ
What is the maximum input voltage rating for the MIC29151-3.3BT?
The MIC29151-3.3BT supports an absolute maximum input voltage of 26 V. Operation above this level risks permanent damage to the internal pass transistor and protection circuitry. For reliable long-term use in 24 V systems, design margin should be maintained per Microchip's recommended derating guidelines in the official datasheet.
Does the MIC29151-3.3BT require an external capacitor on the SENSE pin?
No, the MIC29151-3.3BT does not require an external capacitor on the SENSE pin. When used in local-sensing mode (SENSE tied directly to OUT), the regulator functions normally with only the standard output capacitor. Remote sensing is optional and adds no mandatory external components beyond routing the sense trace.
Can the MIC29151-3.3BT be used without a heatsink in free-air conditions?
Yes, the MIC29151-3.3BT can operate without an external heatsink at ≤500 mA load in 25°C still-air environments, based on its TO-220-5 package thermal resistance (1.5 K/W junction-to-case). At full 1.5 A load, a minimum 10 cm² copper pour on the PCB is required to meet thermal limits per Microchip's layout recommendations.
Is the MIC29151-3.3BT compatible with ceramic output capacitors?
Yes, the MIC29151-3.3BT is fully stable with ceramic output capacitors as low as 22 µF X7R/X5R type. Unlike older LDOs, it imposes no minimum ESR requirement, simplifying filtering design and improving transient response compared to tantalum-based solutions.
What happens to the MIC29151-3.3BT during thermal shutdown?
When the MIC29151-3.3BT junction temperature reaches 165°C, thermal shutdown activates and forces the output to zero volts. The device remains latched off until junction temperature falls below 145°C hysteresis threshold, at which point regulation resumes automatically without external reset.
MIC29151-3.3BT 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):
- 0.6V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Transient Voltage
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC29151-3.3BT FAQ
1.How can I place an order for MIC29151-3.3BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC29151-3.3BT 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 MIC29151-3.3BT reliable?
The price and inventory of MIC29151-3.3BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC29151-3.3BT is usually 5 days.
3.What payment methods are accepted for MIC29151-3.3BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC29151-3.3BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC29151-3.3BT?
MIC29151-3.3BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC29151-3.3BT 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 MIC29151-3.3BT?
For technical support, including MIC29151-3.3BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC29151-3.3BT requirements.
6.How does Aetrix verify that MIC29151-3.3BT is sourced from the original manufacturer or authorized distributors?
All MIC29151-3.3BT 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 MIC29151-3.3BT meets industry standards.
7.What is the process for return or replacement of MIC29151-3.3BT?
All MIC29151-3.3BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC29151-3.3BT, 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 MIC29151-3.3BT part is unused and in its original packaging.
Return procedure for MIC29151-3.3BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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