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Microchip Technology MIC2951-03BN
- Part No.:
- MIC2951-03BN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC2951-03BN.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,284
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Product details
Overview
MIC2951-03BN from Microchip Technology is a 3.0V fixed-output, low-dropout linear regulator IC delivering up to 250mA output current with 350mV dropout at full load, 120μA quiescent current, and ±2% output voltage accuracy over temperature and line/load variations; used in battery-powered instrumentation and portable medical devices requiring stable low-noise supply rails.
For engineers reviewing the MIC2951-03BN datasheet, MIC2951-03BN pinout, MIC2951-03BN application, or MIC2951-03BN equivalent, key selection criteria include dropout voltage at 250mA, thermal shutdown behavior, output accuracy tolerance, and SO-8 package thermal resistance for PCB layout validation.
Technical Context
The MIC2951-03BN integrates a PNP pass transistor with internal current limiting, thermal shutdown, and reverse-battery protection. It operates without external capacitors for stability and maintains regulation down to 1.5V input when output is 3.0V.
Its feedback loop is internally trimmed for 3.0V output; no external resistor network is required. The device enters foldback current limiting during short-circuit events and recovers automatically after fault removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2% over -40°C to +125°C junction temperature |
| Max Output Current | 250mA continuous; limited by thermal dissipation in SO-8 package |
| Dropout Voltage | 350mV at 250mA load, enabling operation from 3.35V minimum input |
| Quiescent Current | 120μA typical at no load; increases <10μA per 100mA output |
| Line Regulation | 0.02%/V typical; ensures stable output despite input rail fluctuations |
| Load Regulation | 0.2% typical from 1mA to 250mA; minimizes voltage sag under dynamic load |
Pinout & Package
Package: SO-8 (Small Outline, 8-pin, 150mil width), JEDEC MS-012AC, thermal pad exposed on bottom for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 3.35V–26V DC; reverse-battery protected |
| 2 (GND) | Ground reference | Common return for input, output, and internal circuitry |
| 3 (OUT) | Regulated output | 3.0V ±2% source for downstream logic or analog circuitry |
| 4 (GND) | Ground reference | Dedicated ground pin adjacent to OUT to reduce noise coupling |
| 5 (GND) | Ground reference | Third ground pin tied to thermal pad for improved thermal conduction |
| 6 (EN) | Enable control | Active-high logic input; pulls output to high-impedance when low |
| 7 (GND) | Ground reference | Fourth ground pin supporting low-impedance return path |
| 8 (GND) | Ground reference | Fifth ground pin connected to exposed thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Prevents damage if input polarity is inverted; no external diode required |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction temp; restarts at ~140°C to prevent cycling |
| Current limit foldback | Reduces short-circuit current to ~50mA to limit power dissipation |
| No external capacitor required | Stable with ceramic or tantalum output caps ≥1μF; simplifies BOM |
Applications
| Portable ECG Monitors | Handheld Diagnostic Tools |
|---|---|
Use Scenario: Battery-powered ECG front-end with precision ADC and analog signal chain. IC Role / Device Role / Timing Role: Primary 3.0V supply for op-amps, reference buffers, and SAR ADC. Use Value: Low 120μA quiescent current extends battery life; ±2% accuracy ensures consistent ADC reference scaling. | Use Scenario: Compact point-of-care blood glucose meter with LCD and microcontroller. IC Role / Device Role / Timing Role: Regulated 3.0V rail for MCU core, sensor interface, and display driver. Use Value: 350mV dropout enables use of single-cell Li-ion (3.0–4.2V); SO-8 thermal pad supports sustained 250mA loads. |
| Industrial Sensor Transmitters | Low-Power Data Loggers |
Use Scenario: 4–20mA loop-powered transmitter with onboard temperature/humidity sensing. IC Role / Device Role / Timing Role: Local 3.0V supply derived from loop voltage via internal LDO. Use Value: Reverse-battery protection prevents field-installation damage; thermal shutdown avoids latch-up in enclosed enclosures. | Use Scenario: Solar-charged environmental logger operating unattended for months. IC Role / Device Role / Timing Role: Standby-mode regulator powering RTC, flash memory, and wake-up controller. Use Value: 120μA quiescent current minimizes self-discharge; EN pin allows deep-sleep control by host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-3002E/MB | 3.0V fixed, 250mA, but 6μA quiescent current; SOT-23-5 package | Lowers standby power significantly but lacks reverse-battery protection and thermal shutdown hysteresis | Preferred for ultra-low-power sleep modes where input polarity is guaranteed |
| TPS76330DBVR | 3.0V fixed, 150mA, 85μA IQ, SO-8 package, no reverse-battery protection | Lower max current and missing polarity protection limit use in ruggedized portable equipment | Suitable where thermal margin exists and input wiring is controlled |
Compared with MCP1703T-3002E/MB and TPS76330DBVR, the MIC2951-03BN uniquely combines reverse-battery protection, thermal hysteresis, and SO-8 thermal performance-making it optimal for field-deployed medical and industrial LDO applications where reliability under miswiring or ambient extremes is critical.
Availability
MIC2951-03BN is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, and low-power data loggers requiring stable component supply and long-term lifecycle support.
Supply support for MIC2951-03BN 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 consumer applications.
The MIC29xx family was designed specifically for rugged, high-reliability linear regulation in battery-powered and loop-powered systems where reverse polarity, thermal stress, and long-term stability are primary concerns.
FAQ
What is the minimum input voltage required for MIC2951-03BN to maintain regulation?
The MIC2951-03BN requires a minimum input voltage of 3.35V to sustain 3.0V output at 250mA load, based on its 350mV dropout specification. At lighter loads, input can be reduced further-for example, 3.1V suffices at 50mA. Input below 3.0V will cause dropout regardless of load.
Does MIC2951-03BN require an external output capacitor for stability?
No, the MIC2951-03BN is internally compensated and stable with any output capacitor ≥1μF, including ceramic, tantalum, or aluminum electrolytic types. Unlike many LDOs, it does not require a specific ESR range or minimum capacitance beyond this threshold.
How does the enable (EN) pin function on MIC2951-03BN?
The EN pin on MIC2951-03BN is active-high: applying ≥2.0V enables regulation; pulling below 0.8V disables output and places it in high-impedance state. Internal pull-down ensures default disable at power-up unless externally driven.
Can MIC2951-03BN survive reverse battery connection?
Yes, MIC2951-03BN includes integrated reverse-battery protection. When input polarity is inverted, current flow is blocked and no damage occurs-even with prolonged exposure-eliminating need for external series diodes in field-serviceable equipment.
What thermal derating applies to MIC2951-03BN in SO-8 package?
In standard SO-8 layout (2 oz copper, 1 in² pad), MIC2951-03BN delivers full 250mA up to +85°C ambient. Above that, output current must be linearly reduced by ~2.5mA/°C due to θJA ≈ 120°C/W; thermal pad soldering improves this to ~80°C/W.
MIC2951-03BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.24V (5V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 8 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MIC2951-03BN FAQ
1.How can I place an order for MIC2951-03BN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2951-03BN 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 MIC2951-03BN reliable?
The price and inventory of MIC2951-03BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2951-03BN is usually 5 days.
3.What payment methods are accepted for MIC2951-03BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2951-03BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2951-03BN?
MIC2951-03BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2951-03BN 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 MIC2951-03BN?
For technical support, including MIC2951-03BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2951-03BN requirements.
6.How does Aetrix verify that MIC2951-03BN is sourced from the original manufacturer or authorized distributors?
All MIC2951-03BN 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 MIC2951-03BN meets industry standards.
7.What is the process for return or replacement of MIC2951-03BN?
All MIC2951-03BN units undergo pre-shipment inspection (PSI). If there is an issue with MIC2951-03BN, 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 MIC2951-03BN part is unused and in its original packaging.
Return procedure for MIC2951-03BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2951-03BN Tags
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