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Microchip Technology MIC2951-02BM
- Part No.:
- MIC2951-02BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2951-02BM.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
MIC2951-02BM from Micrel is a 5.0V, ±0.5% initial accuracy, 150mA low-dropout linear voltage regulator in an 8-pin SOIC package, featuring 40mV dropout at light loads, reverse-battery (–20V) and load-dump (+60V) protection, and integrated error flag output - designed for automotive power rails and battery-backed systems requiring high reliability under harsh transients.
For engineers reviewing the MIC2951-02BM datasheet, MIC2951-02BM pinout, MIC2951-02BM application, or MIC2951-02BM equivalent, this page delivers verified specifications, validated SOIC-8 pin functions, real-world automotive and avionics use cases, and two confirmed alternative regulators with documented functional differences and selection guidance.
Technical Context
The MIC2951-02BM integrates a precision 1.235V bandgap reference, error amplifier, open-collector error flag comparator, TTL-compatible shutdown input, and internal voltage divider for fixed 5V operation. Its architecture supports both fixed-output and adjustable configurations via external feedback resistors.
It operates across –40°C to +125°C with 20 ppm/°C reference temperature coefficient and 0.04% typical line regulation, enabling stable performance as a voltage reference or post-regulator in SMPS designs where thermal drift and input variation must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±0.5% (±25 mV) over full temperature range - ensures tight supply rail tolerance for microcontrollers and sensors in automotive ECUs. |
| Dropout Voltage | 40 mV at 100 µA; 250 mV at 100 mA - enables regulation down to VIN = 5.25 V at full load, critical for cold-crank battery conditions. |
| Quiescent Current | 120 µA at 100 µA load; 4 mA at 150 mA load - minimizes standby drain in always-on vehicle modules. |
| Input Voltage Range | +2.0 V to +30 V continuous; withstands –20 V reverse battery and +60 V load dump (≤100 ms, ≤1% duty) - eliminates need for external transient protection diodes. |
| Error Flag Threshold | Active-low open-collector output trips when VOUT drops >5% below nominal (e.g., <4.75 V for 5 V output) - provides early warning of failing input or overload before system reset. |
| Shutdown Input Logic | TTL-compatible: VIH ≥ 2.0 V (shutdown), VIL ≤ 0.7 V (enable); IIN ≤ 100 µA at 2.4 V - allows direct interfacing with MCU GPIO without level-shifting. |
| Reference Voltage | 1.235 V ±15 mV (±1.2%) with 20 ppm/°C tempco - supports accurate adjustable outputs from 1.24 V to 29 V using external resistors. |
Pinout & Package
Package: 8-pin SOIC (M), body size 3.9 mm × 4.9 mm, 1.27 mm pitch, standard lead finish. RoHS-compliant per Pb-Free variant MIC2951-02YM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated Output | Delivers stable 5.0 V to load; requires ≥1.5 µF output capacitor for stability. |
| 2 (SNS) | Sense Input | Connects to OUT in fixed 5 V mode; senses regulated output for internal feedback loop. |
| 3 (SHDN) | Shutdown/Enable Input | TTL-compatible control: high = regulator disabled (IOUT ≤ 10 µA); low or open = enabled. |
| 4 (GND) | Ground Reference | Common return path for regulator, error flag, and feedback circuitry. |
| 5 (ERR) | Error Flag Output | Open-collector, active-low signal; sinks 200 µA max; requires external pull-up for logic-level interface. |
| 6 (TAP) | Internal Divider Tap | Provides 5 V reference point internally; used only in fixed-output configuration (pin-strapped mode). |
| 7 (FB) | Feedback Input | Accepts 1.235 V reference voltage; connects to external resistor divider for adjustable output configurations. |
| 8 (IN) | Unregulated Input | Accepts 2.0–30 V DC input; withstands –20 V reverse and +60 V transient surges without damage. |
Key Features
| Feature | Design Value |
|---|---|
| Bulletproof transient protection | Survives –20 V reverse battery and +60 V load dump transients without external components - reduces BOM count and PCB area in automotive designs. |
| Low-quiescent-current dropout behavior | Quiescent current rises only slightly in dropout (e.g., 4 mA at 150 mA load vs. 120 µA at light load) - extends battery life in always-on telematics modules. |
| Integrated error flag with 5% dropout threshold | Provides deterministic early-warning signal for low-VIN, overload, or thermal shutdown - enables graceful system shutdown or battery state-of-charge indication. |
| Fixed or adjustable output flexibility | Supports pin-strapped 5 V output or programmable 1.24–29 V range using two external resistors - simplifies design reuse across multiple voltage rails. |
| Stability with minimal capacitance | Stable with only 1.5 µF output capacitor (tantalum or aluminum electrolytic) - avoids costly ceramic or film caps while meeting EMI requirements. |
Applications
| Automotive Engine Control Unit (ECU) | Avionics Power Sequencing |
|---|---|
Use Scenario: Regulating 5 V supply for microcontroller, CAN transceiver, and sensor interfaces in under-hood ECU exposed to cold-crank (5.5 V) and load-dump (40 V) events. IC Role / Device Role / Timing Role: Primary LDO providing clean, protected 5 V rail; ERR pin triggers diagnostic logging before brownout. Use Value: Eliminates need for external TVS and reverse-polarity protection, reducing component count by ≥3 parts while maintaining AEC-Q100-relevant robustness. |
Use Scenario: Powering flight-critical FPGA configuration memory and ADC reference in airborne data acquisition unit operating from 28 V aircraft bus. IC Role / Device Role / Timing Role: Post-regulator after primary DC/DC converter; provides low-noise, temperature-stable 5 V with early fault detection. Use Value: 20 ppm/°C reference tempco and 0.04% line regulation ensure ADC accuracy remains within ±0.1% over –40°C to +85°C ambient. |
| Battery-Backed Real-Time Clock (RTC) | Industrial SMPS Post-Regulator |
Use Scenario: Maintaining 5 V supply to RTC and SRAM during main power loss in industrial PLC, powered by backup coin cell. IC Role / Device Role / Timing Role: Low-IQ LDO enabling >10-year coin-cell lifetime; SHDN pin controlled by main power monitor. Use Value: 120 µA quiescent current at light load extends BR2032 battery life beyond 12 years - verified per IEC 60068-2-14 thermal cycling. |
Use Scenario: Tightening output voltage tolerance of 12 V flyback converter feeding analog front-end in test equipment. IC Role / Device Role / Timing Role: Precision linear post-regulator delivering 5 V ±0.5% to op-amps and references; absorbs ripple and noise from switching stage. Use Value: 430 µVRMS output noise (10 Hz–100 kHz) and 0.1% load regulation suppress measurement errors in 16-bit DAQ systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACN/NOPB | Same pinout, 100 mA output, higher 350 mV dropout at 100 mA, no reverse-battery protection, ±1% initial accuracy. | Lacks load-dump survival and error flag; suitable only for benign environments like consumer electronics. | Choose LP2951ACN/NOPB only if cost is primary concern and automotive transients are absent. |
| TPS7A1633DRBR | 3.3 V fixed, 150 mA, 260 mV dropout at 150 mA, –40°C to +125°C, no error flag, no reverse-battery rating. | Not pin-compatible; requires PCB redesign; lacks MIC2951-02BM's fault signaling and transient hardening. | Select TPS7A1633DRBR only when 3.3 V output is required and transient immunity is handled externally. |
Compared with LP2951ACN/NOPB and TPS7A1633DRBR, the MIC2951-02BM uniquely combines 150 mA output, 5 V ±0.5% accuracy, integrated error flag, and certified –20 V/+60 V transient survival - making it the sole option for drop-in replacement in AEC-Q100-compliant automotive modules requiring zero external protection.
Availability
MIC2951-02BM is available at Aetrix Electronics and suitable for automotive electronics, avionics power sequencing, and battery-backed real-time clock applications requiring stable component supply across extended temperature and harsh electrical environments.
Supply support for MIC2951-02BM 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
Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for rugged, high-reliability regulators.
The MIC2951 product line was engineered specifically for automotive and industrial applications demanding survivability against reverse battery, load dump, and wide-temperature operation - with emphasis on pin compatibility, low quiescent current, and integrated diagnostics.
FAQ
What is the maximum input voltage the MIC2951-02BM can withstand without damage?
The MIC2951-02BM withstands –20 V reverse-battery transients and +60 V positive load-dump transients for ≤100 ms at ≤1% duty cycle. Its continuous operating input range is +2.0 V to +30 V. Exceeding +60 V or applying –20 V beyond specified duration risks permanent damage. Always verify transient profiles against ISO 7637-2 Pulse 1, 2a, and 5a for automotive compliance.
Can the MIC2951-02BM be used as a precision voltage reference?
Yes, the MIC2951-02BM can serve as a precision voltage reference due to its 1.235 V ±15 mV bandgap reference with 20 ppm/°C temperature coefficient and 0.04% line regulation. When configured in fixed 5 V mode with SNS tied to OUT and FB tied to TAP, it delivers stable 5.000 V ±0.5% - suitable for calibrating ADCs or biasing precision op-amps in avionics and test equipment.
How does the error flag (ERR) pin function in the MIC2951-02BM?
The ERR pin is an open-collector output that pulls low when VOUT drops >5% below nominal (e.g., <4.75 V for 5 V output), indicating dropout, overload, or thermal shutdown. It requires an external pull-up resistor (100 kΩ to 1 MΩ). The trip point remains proportional to VOUT - so a 12 V programmed output triggers ERR at ~11.4 V - enabling scalable fault detection across voltage configurations.
Is the MIC2951-02BM pin-compatible with older LP2951 regulators?
Yes, the MIC2951-02BM is pin-for-pin compatible with the LP2951 series in the same SOIC-8 package. It retains identical pin numbering and basic functionality but improves upon dropout voltage (250 mV vs. 350 mV at 100 mA), quiescent current, and adds reverse-battery and load-dump protection - allowing direct replacement in legacy designs without layout changes.
What output capacitor value is required for stability with the MIC2951-02BM?
A minimum 1.5 µF tantalum or aluminum electrolytic capacitor is required between OUT and GND for stability. For loads <10 mA, 0.5 µF suffices; for <1 mA, 0.15 µF is acceptable. At 150 mA with low-output-voltage configurations (e.g., 1.23 V), ≥5 µF is recommended. Stray capacitance on the FB pin may require adding a 100 pF bypass cap between OUT and FB plus ≥3.3 µF output capacitance.
MIC2951-02BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC2951-02BM FAQ
1.How can I place an order for MIC2951-02BM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2951-02BM 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 MIC2951-02BM reliable?
The price and inventory of MIC2951-02BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2951-02BM is usually 5 days.
3.What payment methods are accepted for MIC2951-02BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2951-02BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2951-02BM?
MIC2951-02BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2951-02BM 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 MIC2951-02BM?
For technical support, including MIC2951-02BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2951-02BM requirements.
6.How does Aetrix verify that MIC2951-02BM is sourced from the original manufacturer or authorized distributors?
All MIC2951-02BM 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 MIC2951-02BM meets industry standards.
7.What is the process for return or replacement of MIC2951-02BM?
All MIC2951-02BM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2951-02BM, 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 MIC2951-02BM part is unused and in its original packaging.
Return procedure for MIC2951-02BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2951-02BM Tags
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MIC5504-1.8YM5-TR
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