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Microchip Technology MCP1812BT-025/LB
- Part No.:
- MCP1812BT-025/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812BT-025/LB.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,608
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Product details
Overview
MCP1812BT-025/LB from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) low-dropout linear regulator with fixed 2.5 V output, designed for energy harvesting and long-life battery-powered systems operating from 1.8V to 5.5V input. It features output discharge during shutdown, overcurrent protection, and stability with only 2.2 µF ceramic output capacitance.
For engineers reviewing the MCP1812BT-025/LB datasheet, MCP1812BT-025/LB pinout, MCP1812BT-025/LB application, or MCP1812BT-025/LB equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options - all grounded in Microchip's DS20006088C specification.
Technical Context
The MCP1812BT-025/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and minimal ground current (180–220 µA across load). Its internal error amplifier and reference circuit maintain ±4% output voltage accuracy over –40°C to +85°C junction temperature.
It integrates a dedicated discharge transistor (RDCH = 100 Ω typical) activated when SHDN = GND, ensuring rapid VOUT collapse to prevent back-powering of downstream circuitry. Shutdown supply current is 5 nA typical, supporting multi-year operation in sleep-dominated applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±4% - ensures stable bias for precision analog sensors and low-voltage MCUs without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) while retaining ultra-low IQ. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in devices drawing <1 µA average current during sleep. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvested sources. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation down to ~2.9 V input for 2.5 V output, maximizing usable battery range. |
| Output Capacitance | 2.2 µF ceramic (X7R) - enables compact, low-noise, cost-effective filtering without tantalum or electrolytic components. |
| Shutdown Current | 5 nA typical - reduces standby power to negligible levels, critical for always-on wake-on-event architectures. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236), surface-mount, RoHS-compliant, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for PSRR and stability. |
| GND | Ground reference | Low-impedance return path for regulator ground current (180–220 µA); must connect directly to quiet ground plane. |
| VOUT | Regulated output | Delivers stable 2.5 V; requires ≥2.2 µF X7R ceramic capacitor placed adjacent to pin for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables >10-year coin-cell operation in intermittent-sensing nodes. |
| Integrated output discharge | 100 Ω discharge transistor actively pulls VOUT to GND on shutdown, preventing residual voltage hold-up. |
| Ceramic-capacitor stability | Stable with 2.2 µF X7R ceramic only - eliminates ESR requirements and simplifies BOM. |
| Overcurrent foldback | 100 mA foldback limit under short-circuit protects IC and source during fault conditions. |
| High PSRR at 1 kHz | –50 dB PSRR with no input capacitor - suppresses ripple from noisy switchers or shared rails. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Indoor light or thermal energy harvester powers a wireless sensor node logging temperature every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator converting variable harvested voltage (2.0–4.5 V) to stable 2.5 V for MCU and RF transceiver. Use Value: 250 nA quiescent current minimizes drain during 99.9% sleep time; 2.2 µF ceramic cap enables ultra-thin PCB design. | Use Scenario: Disposable glucose monitor worn for 14 days, sampling biometric data hourly. IC Role / Device Role / Timing Role: Main LDO supplying 2.5 V to electrochemical sensor interface and BLE SoC during active measurement bursts. Use Value: 5 nA shutdown current extends shelf life; output discharge prevents false wake-ups from residual VOUT coupling. |
| Smart Card Reader | Hearing Aid Front-End |
Use Scenario: Contactless smart card reader powered by USB or coin cell, activating only on NFC field detection. IC Role / Device Role / Timing Role: Low-noise 2.5 V rail generator for secure element and RF front-end during brief 100-ms authentication windows. Use Value: 400 mV dropout preserves headroom from 3.3 V USB; ±4% output tolerance meets ISO/IEC 7816 analog supply specs. | Use Scenario: Rechargeable hearing aid using zinc-air battery, requiring silent, stable bias for microphone preamp and ADC. IC Role / Device Role / Timing Role: Ultra-low-noise 2.5 V supply for analog signal chain, operating continuously during wear time. Use Value: Ceramic-capacitor stability eliminates audible switching noise; 169 µVrms integrated noise (10 Hz–100 kHz) avoids audio band interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-2502E/MB | Same 2.5 V output, 300 mA rating, and 250 nA IQ, but in 4-lead 1×1 mm UDFN with exposed thermal pad. | Higher thermal performance (θJA = 91°C/W vs. 211°C/W) - preferred for sustained 300 mA loads in compact enclosures. | Select when board space is constrained and thermal dissipation >150 mW is expected. |
| Torex XC6210B252MR-G | 2.5 V, 300 mA, 250 nA IQ, but no output discharge; shutdown current 10 nA (vs. 5 nA). | Lacks active VOUT discharge - unsuitable where residual voltage must be eliminated during deep sleep. | Choose only if discharge function is unnecessary and UDFN/SOT-23 footprint compatibility is confirmed. |
Compared with MCP1812-2502E/MB, the MCP1812BT-025/LB offers identical electrical performance in a legacy SOT-23 package ideal for rework and prototyping; versus XC6210B252MR-G, it provides critical output discharge functionality essential for zero-leakage system-level power gating.
Availability
MCP1812BT-025/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card readers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-025/LB 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 Inc. is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona.
The MCP181X/12X family was engineered specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust shutdown behavior in miniature packages.
FAQ
What is the maximum input voltage rating for the MCP1812BT-025/LB?
The MCP1812BT-025/LB has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended, as the device is specified for reliable performance only within its 1.8 V to 5.5 V operating input range per DS20006088C. Exceeding 6.0 V risks permanent damage.
Does the MCP1812BT-025/LB require an input capacitor?
The MCP1812BT-025/LB does not require an input capacitor for stability, as confirmed in the AC/DC Characteristics table (CIN = 0 µF used for PSRR testing). However, a 1 µF ceramic capacitor placed close to the VIN pin is strongly recommended to suppress high-frequency noise and improve transient response.
Is the MCP1812BT-025/LB pin-compatible with other variants in the MCP1812X series?
Yes - the MCP1812BT-025/LB uses the standard 3-lead SOT-23 pinout (VIN, GND, VOUT) shared across all MCP1812A/B variants in that package. Voltage variants (e.g., MCP1812BT-330/LB) and shutdown variants (MCP1812AT-025/LB) maintain identical pin assignments and mechanical footprint.
What is the thermal resistance (θJA) of the MCP1812BT-025/LB in its SOT-23 package?
The MCP1812BT-025/LB in 3-lead SOT-23 has a thermal resistance θJA of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes no thermal vias; adding vias beneath the GND pad can reduce effective θJA by up to 30%.
Can the MCP1812BT-025/LB be used with a 1 µF output capacitor?
No - the MCP1812BT-025/LB requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as explicitly stated in the datasheet for all MCP1812X devices. Using only 1 µF may cause oscillation or poor transient response, especially at full 300 mA load.
MCP1812BT-025/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 220 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MCP1812BT-025/LB FAQ
1.How can I place an order for MCP1812BT-025/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-025/LB 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 MCP1812BT-025/LB reliable?
The price and inventory of MCP1812BT-025/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812BT-025/LB is usually 5 days.
3.What payment methods are accepted for MCP1812BT-025/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-025/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-025/LB?
MCP1812BT-025/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-025/LB 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 MCP1812BT-025/LB?
For technical support, including MCP1812BT-025/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-025/LB requirements.
6.How does Aetrix verify that MCP1812BT-025/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-025/LB 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 MCP1812BT-025/LB meets industry standards.
7.What is the process for return or replacement of MCP1812BT-025/LB?
All MCP1812BT-025/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-025/LB, 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 MCP1812BT-025/LB part is unused and in its original packaging.
Return procedure for MCP1812BT-025/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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