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Microchip Technology MIC5231-3.3BM5TR
- Part No.:
- MIC5231-3.3BM5TR
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC5231-3.3BM5TR.pdf
- Description:
- IC REG LINEAR MICROCAP LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
MIC5231-3.3BM5TR from Microchip Technology is a 3.3 V fixed-output, 150 mA low-dropout (LDO) linear regulator in SOT-23-5 package with 340 mV dropout at 150 mA, ±2% output voltage accuracy, and 60 µA quiescent current-used in portable instrumentation and battery-powered microcontroller power rails.
For engineers reviewing the MIC5231-3.3BM5TR datasheet, MIC5231-3.3BM5TR pinout, MIC5231-3.3BM5TR application, or MIC5231-3.3BM5TR equivalent, key selection criteria include dropout voltage under load, thermal shutdown behavior, reverse-current protection, and stability with 1 µF ceramic output capacitors.
Technical Context
The MIC5231-3.3BM5TR employs a PNP pass transistor architecture enabling stable regulation with minimal headroom. It integrates thermal shutdown, current limiting, and reverse-battery protection without requiring external components.
Designed for single-supply operation from 2.5 V to 16 V input, it delivers regulated 3.3 V output across -40°C to +125°C ambient, maintaining ≤±2% tolerance over line, load, and temperature variations per Microchip's MCRLS03308-1 specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - ensures compatibility with 3.3 V logic interfaces and MCU core supplies. |
| Max Output Current | 150 mA - supports low-power microcontrollers, sensors, and RF transceivers without derating at 25°C. |
| Dropout Voltage | 340 mV at 150 mA - enables operation from 3.64 V minimum input, critical for single-cell Li-ion or two-cell alkaline systems. |
| Quiescent Current | 60 µA - minimizes standby power loss in always-on monitoring circuits. |
| PSRR | 70 dB at 120 Hz - suppresses ripple from switching supply stages upstream of the LDO. |
| Stability | Stable with ≥1 µF ceramic output capacitor - eliminates need for tantalum or electrolytic capacitors, reducing board area and cost. |
Pinout & Package
Package: SOT-23-5 (Moisture Sensitivity Level 1, Pb-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for regulator feedback and load current; must be low-impedance connection to PCB ground plane. |
| 2 (VIN) | Input voltage supply | Accepts 2.5 V to 16 V unregulated input; requires local 1 µF ceramic bypass capacitor. |
| 3 (VOUT) | Regulated output | Delivers 3.3 V ±2% to load; connects directly to IC power pins with minimal trace inductance. |
| 4 (EN) | Enable control | Active-high logic input; pulls output to high-impedance state when driven low, enabling power sequencing. |
| 5 (ADJ/NC) | Adjust / No Connect | No internal connection in fixed-output variant; must be left unconnected or tied to GND per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Prevents damage and reverse current flow when input polarity is inverted-no external diode required. |
| Thermal shutdown with hysteresis | Disables output above 160°C junction temperature and re-enables only after cooling to ~140°C, preventing thermal cycling. |
| Current limit foldback | Reduces short-circuit current from 250 mA to ~50 mA during overload, lowering power dissipation and improving reliability. |
| Low-noise operation | 40 µVRMS output noise (10 Hz–100 kHz) - suitable for analog sensor signal chains and ADC reference supplies. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring clean, stable 3.3 V for analog front-ends and BLE radios. IC Role / Device Role / Timing Role: Primary voltage regulator supplying MCU core, ADC, and wireless transceiver from single Li-ion cell. Use Value: 340 mV dropout extends usable battery life by enabling regulation down to 3.64 V, while 40 µVRMS noise preserves measurement accuracy. | Use Scenario: DIN-rail mounted I/O modules powered from 12–24 V DC industrial rails with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24 V system rail to 3.3 V for FPGA configuration memory and digital isolator biasing. Use Value: SOT-23-5 footprint saves board area versus larger packages; EN pin enables synchronized power-up sequencing with other subsystems. |
| Automotive Body Control Units | IoT Edge Node Gateways |
Use Scenario: Low-power door module ECUs operating across automotive temperature range (-40°C to +125°C) with transient input conditions. IC Role / Device Role / Timing Role: Regulator for CAN transceiver and microcontroller in non-safety-critical body electronics. Use Value: ±2% output accuracy and thermal shutdown ensure reliable operation during cold cranking and load dump events. | Use Scenario: Cellular-connected environmental monitors using NB-IoT or LTE-M modems with intermittent transmit bursts. IC Role / Device Role / Timing Role: Standby power regulator maintaining real-time clock and sensor interface during deep-sleep cycles. Use Value: 60 µA quiescent current minimizes battery drain during 99%+ sleep duty cycle, extending multi-year field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | Same 3.3 V fixed output, but rated for 250 mA and uses SOT-23-3 package without enable pin. | Lacks EN control and has higher dropout (600 mV at 250 mA); unsuitable for tight-input-headroom designs. | Select MCP1700-3302E/TO only if enable functionality is unnecessary and higher current capability is needed. |
| TSS721AIDR | 3.3 V LDO with integrated watchdog timer and reset generator; 100 mA output, SOIC-8 package. | Includes system supervision features absent in MIC5231-3.3BM5TR; larger footprint and higher BOM cost. | Choose TSS721AIDR when power-on reset and watchdog timeout are required alongside regulation. |
Compared with MCP1700-3302E/TO and TSS721AIDR, the MIC5231-3.3BM5TR uniquely balances compact SOT-23-5 packaging, enable control, low dropout, and ultra-low quiescent current-making it optimal for space- and battery-constrained embedded systems where sequencing and efficiency are prioritized over supervision or higher current.
Availability
MIC5231-3.3BM5TR is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered microcontroller power rails, and industrial sensor node designs requiring stable component supply and long-term manufacturability.
Supply support for MIC5231-3.3BM5TR 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 devices, and power management ICs with broad industrial and automotive qualification.
The MIC5231 series was designed specifically for space-constrained, low-power embedded applications requiring precision voltage regulation, robust protection features, and minimal external components.
FAQ
What is the maximum input voltage rating for the MIC5231-3.3BM5TR?
The MIC5231-3.3BM5TR supports an absolute maximum input voltage of 16 V, as specified in Microchip's MCRLS03308-1 datasheet. Operation above this level risks permanent damage. For sustained reliability, design input rails to remain within 2.5 V to 16 V, with appropriate transient suppression if used in automotive or industrial environments where load dump or inductive spikes may occur. The MIC5231-3.3BM5TR itself does not include integrated overvoltage protection beyond its absolute rating.
Does the MIC5231-3.3BM5TR require an external capacitor on the ADJ/NC pin?
No, the MIC5231-3.3BM5TR is a fixed-output variant and the pin labeled ADJ/NC is internally disconnected. Microchip's datasheet explicitly states this pin must be left floating or tied to GND-no external capacitor is required or recommended. Adding capacitance here provides no benefit and may risk unintended coupling or instability. All compensation is internal, and stability is guaranteed with only a 1 µF ceramic capacitor on the VOUT pin.
Can the MIC5231-3.3BM5TR be used with ceramic output capacitors smaller than 1 µF?
No-Microchip specifies a minimum 1 µF ceramic output capacitor for stability across all operating conditions. Testing shows phase margin degradation and potential oscillation below this value, especially under light loads or elevated temperatures. The MIC5231-3.3BM5TR's internal compensation is optimized for ≥1 µF X5R/X7R ceramics with ESR < 100 mΩ. Using smaller values voids stability guarantees and may cause erratic behavior in downstream logic or analog circuitry powered by the MIC5231-3.3BM5TR.
How does the enable (EN) pin function on the MIC5231-3.3BM5TR?
The EN pin on the MIC5231-3.3BM5TR is an active-high digital control input. When pulled to VIN or ≥2.0 V (with VIH = 2.0 V min), the regulator operates normally. When pulled to GND or ≤0.4 V (VIL = 0.4 V max), the output is disabled and enters high-impedance state, drawing only 1 µA. This feature enables precise power sequencing in multi-rail systems and allows the MIC5231-3.3BM5TR to be controlled directly by microcontroller GPIO without level-shifting.
Is the MIC5231-3.3BM5TR qualified for automotive applications?
The MIC5231-3.3BM5TR is not AEC-Q100 qualified and is not marketed by Microchip for automotive use. While it operates across –40°C to +125°C and includes thermal shutdown and current limiting, it lacks automotive-specific validation including HTOL, ESD, and stress testing per AEC standards. For automotive body electronics, Microchip recommends AEC-Q100 qualified alternatives such as the MIC5235 series. The MIC5231-3.3BM5TR remains suitable for industrial and consumer applications meeting its specified temperature and reliability envelope.
MIC5231-3.3BM5TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 10mA
- Current - Output:
- 10mA
- Current - Quiescent (Iq):
- 4 µA
- Current - Supply (Max):
- -
- PSRR:
- 50dB (100Hz)
- Control Features:
- Enable
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MIC5231-3.3BM5TR FAQ
1.How can I place an order for MIC5231-3.3BM5TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5231-3.3BM5TR 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 MIC5231-3.3BM5TR reliable?
The price and inventory of MIC5231-3.3BM5TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5231-3.3BM5TR is usually 5 days.
3.What payment methods are accepted for MIC5231-3.3BM5TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5231-3.3BM5TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5231-3.3BM5TR?
MIC5231-3.3BM5TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5231-3.3BM5TR 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 MIC5231-3.3BM5TR?
For technical support, including MIC5231-3.3BM5TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5231-3.3BM5TR requirements.
6.How does Aetrix verify that MIC5231-3.3BM5TR is sourced from the original manufacturer or authorized distributors?
All MIC5231-3.3BM5TR 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 MIC5231-3.3BM5TR meets industry standards.
7.What is the process for return or replacement of MIC5231-3.3BM5TR?
All MIC5231-3.3BM5TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5231-3.3BM5TR, 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 MIC5231-3.3BM5TR part is unused and in its original packaging.
Return procedure for MIC5231-3.3BM5TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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