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Microchip Technology MIC2951-03BM TR
- Part No.:
- MIC2951-03BM TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2951-03BM TR.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
MIC2951-03BM TR from Micrel is a 5.0V, ±1% accuracy, 150mA low-dropout linear voltage regulator in 8-pin SOIC package, featuring 250mV dropout at 100mA, 4µA ground current at light load, and integrated error flag output. It delivers stable power to automotive control modules, battery-powered instrumentation, and SMPS post-regulation stages where reverse-battery and load-dump protection are required.
For engineers reviewing the MIC2951-03BM TR datasheet, MIC2951-03BM TR pinout, MIC2951-03BM TR application, or MIC2951-03BM TR equivalent, key selection criteria include guaranteed 150mA output under –40°C to +125°C, open-collector ERR output for low-voltage warning, logic-controlled shutdown (TTL-compatible), and compatibility with 1.5µF output capacitance for stability without external compensation.
Technical Context
The MIC2951-03BM TR integrates a precision 1.235V bandgap reference, error amplifier, and open-collector comparator for output monitoring. Its feedback architecture supports both fixed 5V operation (via internal TAP resistor network) and adjustable outputs from 1.24V to 29V using external resistors.
It implements thermal and current limiting, withstands –20V reverse-battery and +60V transient inputs (≤100ms), and maintains regulation down to 2.0V input-enabling robust operation in automotive 12V systems during cranking or cold-cranking conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±1% over –40°C to +125°C; ensures consistent supply for microcontrollers and sensors across automotive temperature range. |
| Dropout Voltage | 250mV at 100mA load; enables regulation from as low as 5.25V input-critical during engine cranking when battery sags to ~6V. |
| Ground Current | 4µA at 100µA load; extends battery life in always-on vehicle modules such as CAN wake-up receivers. |
| Input Voltage Range | +2.0V to +30V continuous; survives automotive transients up to +60V (100ms) and reverse battery down to –20V. |
| Error Flag Threshold | Active-low output trips when VOUT drops ≥5% below nominal (e.g., <4.75V for 5V output); provides early warning of failing input or overload. |
| Shutdown Input | TTL-compatible SHDN pin (low = enable, high = shutdown); draws ≤100µA in shutdown-ideal for low-power sleep modes. |
| Load Regulation | 0.10–0.30% over 100µA–150mA; minimizes output variation across dynamic load changes in embedded control units. |
Pinout & Package
Package: 8-pin SOIC (M), body size 3.9mm × 4.9mm, 1.27mm pitch, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated Output | Delivers stable 5.0V to load; requires ≥1.5µF output capacitor to ground for stability. |
| 2 (SNS) | Sense Input | Connects to OUT in fixed 5V mode; senses regulated output for internal feedback-bypassed in adjustable configuration. |
| 3 (SHDN) | Shutdown Control | TTL-level input: ≤0.7V = enabled, ≥2.0V = shutdown; enables system-level power sequencing. |
| 4 (GND) | Ground Reference | Common return path for regulator, feedback, and error circuitry; must be low-impedance for noise immunity. |
| 5 (ERR) | Error Flag Output | Open-collector, active-low signal; requires external pull-up (100kΩ–1MΩ) to monitor output health or trigger reset. |
| 6 (TAP) | Internal Voltage Tap | Provides 5V reference point for fixed-mode operation; unused in adjustable configurations. |
| 7 (FB) | Feedback Input | Accepts 1.235V reference voltage; connects to external resistor divider for programmable output voltages. |
| 8 (IN) | Unregulated Input | Accepts 2.0–30V DC input; designed to survive –20V reverse polarity and +60V load-dump transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bulletproof transient protection | Withstands –20V reverse battery and +60V load dump (≤100ms), eliminating need for external TVS diodes in automotive designs. |
| Low-quiescent-current shutdown | Draws only 3–10µA in shutdown mode, enabling multi-year battery operation in telematics and ECU keep-alive circuits. |
| Integrated error detection | ERR pin provides fail-safe output monitoring without external comparators-reduces BOM count and PCB area. |
| Flexible output configuration | Supports pin-strapped 5V output or 1.24–29V programmable regulation via two external resistors-enables single-part reuse across multiple voltage rails. |
| Stability with minimal capacitance | Stable with only 1.5µF output capacitor (tantalum or aluminum electrolytic); avoids costly ceramic or film types. |
Applications
| Automotive Body Control Module | Industrial Sensor Transmitter |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and door-lock actuator drivers in a vehicle's BCM under cold-crank (5.5V input) and load-dump (60V spike) conditions. IC Role / Device Role / Timing Role: Primary 5V LDO supplying core logic and interface ICs; ERR pin feeds MCU interrupt for brown-out detection and safe state entry. Use Value: Eliminates need for discrete transient suppression and external reset IC, reducing bill-of-materials by two components while meeting ISO 7637-2 Pulse 5a requirements. | Use Scenario: Regulating 5V for a 4–20mA loop-powered pressure transmitter operating in hazardous industrial zones with wide ambient temperature swings. IC Role / Device Role / Timing Role: Post-regulator after isolated DC/DC converter; SHDN pin enables remote power cycling via PLC I/O for field calibration. Use Value: 0.1% load regulation and 50ppm/°C tempco ensure <0.1% full-scale error drift over –40°C to +85°C-meeting SIL-2 functional safety margin for analog sensor outputs. |
| Medical Portable Monitor | Avionics Data Acquisition Unit |
Use Scenario: Supplying 5V to low-power ADC, display driver, and Bluetooth SoC in a battery-operated patient vital-sign monitor requiring >72-hour runtime on Li-ion. IC Role / Device Role / Timing Role: Main system regulator with ERR flag wired to MCU to detect battery depletion before critical shutdown. Use Value: 4µA quiescent current at light load and 250mV dropout extend usable battery capacity by 18% compared to legacy LP2951-based designs. | Use Scenario: Providing clean 5V bias to radiation-tolerant FPGA configuration memory and ADC reference in a satellite telemetry subsystem. IC Role / Device Role / Timing Role: Secondary regulator downstream of MIL-STD-1275B-compliant DC/DC; TAP and FB pins used for redundant voltage verification. Use Value: Dual-path sensing (SNS and FB) enables cross-checked output validation-supporting DO-254 Level A design assurance for flight-critical data acquisition. |
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, but higher 350mV dropout at 100mA and no reverse-battery protection; 1.5% initial accuracy vs. MIC2951-03BM TR's 1.0%. | Lacks ERR flag and SHDN; requires external reset IC for brown-out detection. | Select only if legacy footprint reuse is mandatory and automotive transients are suppressed externally. |
| TPS76350DBVR | Lower 120mV dropout at 100mA, but only rated to +85°C junction and lacks reverse-battery tolerance; no error flag output. | Not qualified for automotive underhood use; unsuitable for load-dump environments without added protection. | Prefer for commercial-grade portable equipment where ultra-low dropout outweighs ruggedness requirements. |
Compared with LP2951ACN/NOPB and TPS76350DBVR, the MIC2951-03BM TR uniquely combines automotive-grade transient robustness, integrated error signaling, and extended temperature operation-making it the only choice for cost-sensitive, space-constrained automotive and industrial control applications demanding single-chip reliability.
Availability
MIC2951-03BM TR is available at Aetrix Electronics and suitable for automotive electronics, battery-powered instrumentation, and SMPS post-regulation requiring stable component supply across extended temperature ranges and harsh electrical environments.
Supply support for MIC2951-03BM TR 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.
The MIC2951 product line was engineered for automotive and industrial applications demanding high reliability under voltage transients, extreme temperatures, and long service life-emphasizing fault resilience over raw efficiency.
FAQ
What is the maximum input voltage the MIC2951-03BM TR can withstand without damage?
The MIC2951-03BM TR supports continuous input voltages from +2.0V to +30V. It can survive transient overvoltages up to +60V for durations ≤100ms and duty cycles ≤1%, per its absolute maximum rating-making it suitable for automotive load-dump events defined in ISO 7637-2.
Does the MIC2951-03BM TR require an external capacitor for stability, and what value is recommended?
Yes, the MIC2951-03BM TR requires a minimum 1.5µF output capacitor between OUT and GND for stability. Aluminum or tantalum electrolytics with ≤5Ω ESR are recommended; ceramic capacitors may cause instability unless additional series resistance is added. For 150mA loads at low output voltages (<5V), ≥5µF is advised.
How does the ERR pin on the MIC2951-03BM TR function, and what external components are needed?
The ERR pin on the MIC2951-03BM TR is an open-collector output that pulls low when VOUT drops ≥5% below nominal (e.g., <4.75V for 5V). It requires an external pull-up resistor (100kΩ–1MΩ) to VOUT or another supply. The sink current is rated to 200µA, and leakage remains <2µA when inactive.
Can the MIC2951-03BM TR be used in adjustable-output configurations, and what is the supported voltage range?
Yes, the MIC2951-03BM TR supports adjustable output from 1.24V to 29V using external resistors on the FB and GND pins. The internal 1.235V reference and 20nA feedback bias current allow precise programming; R2 ≤1.2MΩ is recommended to maintain accuracy under no-load conditions.
What is the thermal performance of the MIC2951-03BM TR in its SOIC package, and how much power can it dissipate continuously?
The MIC2951-03BM TR in 8-pin SOIC has a junction-to-ambient thermal resistance of 160°C/W. At maximum ambient temperature of +125°C and TJ(max) = +125°C, continuous power dissipation is limited to ~0W-meaning it must be operated within derated limits. For 150mA output at 5V with 7V input, PD ≈ 0.3W, resulting in ~48°C rise above ambient-well within safe operating range.
MIC2951-03BM TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC2951-03BM TR FAQ
1.How can I place an order for MIC2951-03BM TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2951-03BM TR 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 MIC2951-03BM TR reliable?
The price and inventory of MIC2951-03BM TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2951-03BM TR is usually 5 days.
3.What payment methods are accepted for MIC2951-03BM TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2951-03BM TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2951-03BM TR?
MIC2951-03BM TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2951-03BM TR 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 MIC2951-03BM TR?
For technical support, including MIC2951-03BM TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2951-03BM TR requirements.
6.How does Aetrix verify that MIC2951-03BM TR is sourced from the original manufacturer or authorized distributors?
All MIC2951-03BM TR 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 MIC2951-03BM TR meets industry standards.
7.What is the process for return or replacement of MIC2951-03BM TR?
All MIC2951-03BM TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2951-03BM TR, 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 MIC2951-03BM TR part is unused and in its original packaging.
Return procedure for MIC2951-03BM TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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