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Microchip Technology MCP1812BT-012/OT
- Part No.:
- MCP1812BT-012/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812BT-012/OT.pdf
- Description:
- IC REG LINEAR 1.2V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
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Product details
Overview
MCP1812BT-012/OT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.2 V low-dropout linear regulator in SOT-23-3 package, featuring output discharge during shutdown and stable operation with 2.2 µF ceramic output capacitor. It supports input voltages from 1.8 V to 5.5 V and delivers precise ±4% output regulation across –40°C to +85°C junction temperature.
For engineers reviewing the MCP1812BT-012/OT datasheet, MCP1812BT-012/OT pinout, MCP1812BT-012/OT application, or MCP1812BT-012/OT equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases in energy-constrained systems, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1812BT-012/OT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400–600 mV at 300 mA) and minimal ground current (180–220 µA over full load range). Its internal error amplifier and reference circuit maintain tight output regulation under dynamic load steps up to 300 mA while sustaining sub-µA quiescent draw.
Shutdown control via SHDN pin reduces supply current to 10 nA typical, and the integrated discharge transistor (RDCH = 100 Ω) actively pulls VOUT to GND when disabled - a critical feature for system-level power sequencing and leakage control in battery-backed circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures stable core/bias rail for ultra-low-voltage MCUs and sensors without external feedback. |
| Max Output Current | 300 mA - sufficient to power multi-peripheral IoT nodes or wearable SoCs without thermal derating in SOT-23-3. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices operating in deep-sleep cycles. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and regulated intermediate rails. |
| Dropout Voltage | 400–600 mV at 300 mA - allows operation down to ~1.6 V input while maintaining 1.2 V output, extending usable battery range. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-noise design with no ESR requirements or tantalum dependency. |
| Shutdown Current | 10 nA typical - eliminates standby drain in always-off subsystems such as tamper-detection or wake-on-event circuits. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, exposed pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V input; requires local 1 µF ceramic bypass capacitor to minimize PSRR degradation and transient response overshoot. |
| 2 (GND) | Ground reference | Low-impedance return path for both input and output currents; must connect directly to quiet ground plane near output capacitor. |
| 3 (VOUT) | Regulated output | Delivers fixed 1.2 V ±4%; requires 2.2 µF X7R ceramic capacitor (ESR < 100 mΩ) for stability and low-noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 in sleep-dominated applications like wireless sensor nodes. |
| Output discharge on shutdown | Active pull-down via internal 100 Ω transistor ensures rapid VOUT decay, preventing back-powering of upstream circuitry. |
| Stable with 2.2 µF ceramic cap | Eliminates need for high-ESR tantalum or aluminum electrolytic capacitors, reducing BOM cost and board area by >50%. |
| Wide input range (1.8–5.5 V) | Supports direct connection to unregulated battery sources across chemistries without pre-regulation stage. |
| ±4% output accuracy | Meets core voltage tolerance requirements for 1.2 V I/O domains in microcontrollers and ASICs without trimming. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
|
Use Scenario: Powering BLE transceiver, MEMS sensor, and ultra-low-power MCU from microwatt-scale thermal or RF harvesters. IC Role / Device Role / Timing Role: Primary voltage regulator delivering clean 1.2 V rail with sub-µA idle draw to extend harvester charge accumulation time. Use Value: Enables continuous operation on <10 µW average input power due to 250 nA quiescent current and 2.2 µF ceramic stability. |
Use Scenario: Supplying DSP core and analog front-end in miniaturized rechargeable hearing aids with strict size and battery life constraints. IC Role / Device Role / Timing Role: Main LDO providing regulated 1.2 V for digital signal processing block, with fast start-up (<400 µs) and low noise (<223 µVrms). Use Value: Supports 5+ year battery life on 38 mAh Li-ion cell via 10 nA shutdown current and efficient 300 mA delivery during active bursts. |
| Smart Card Reader | Industrial Wireless Sensor |
|
Use Scenario: Regulating power for contactless smart card interface ICs in portable readers powered by USB or coin cell. IC Role / Device Role / Timing Role: Fixed-output LDO ensuring stable 1.2 V supply during NFC field activation pulses with minimal voltage droop. Use Value: Maintains ±4% regulation under 300 mA pulsed loads and rejects ripple from noisy USB sources via –50 dB PSRR at 1 kHz. |
Use Scenario: Powering LoRaWAN node with MCU, radio, and environmental sensors in remote industrial monitoring deployments. IC Role / Device Role / Timing Role: System LDO supplying 1.2 V to MCU and peripherals; shutdown mode activated between transmissions to conserve energy. Use Value: Achieves 15-year field life on AA batteries using 10 nA shutdown current and robust –40°C to +85°C operation without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-012/OT | No SHDN pin; 3-pin SOT-23 variant without shutdown control or output discharge. | Used where always-on regulation is acceptable and PCB space is constrained (no SHDN trace required). | Select when system-level power sequencing is handled externally and lowest possible footprint is prioritized. |
| Torex XC6210B122MR-G | 250 nA IQ, 200 mA output, no output discharge, 1.2 V fixed, SOT-23-5 package with EN and CL pins. | Requires external enable logic; lacks active VOUT discharge, limiting use in back-powering-sensitive designs. | Choose when higher PSRR (>60 dB at 1 kHz) is needed and 200 mA output suffices; verify layout compatibility with 5-pin footprint. |
Compared with MCP1812-012/OT, the MCP1812BT-012/OT adds essential shutdown control and output discharge for safe power sequencing, while the Torex XC6210B122MR-G trades discharge capability for higher PSRR but reduces max current and increases pin count - making MCP1812BT-012/OT optimal for compact, battery-critical systems requiring guaranteed VOUT collapse on disable.
Availability
MCP1812BT-012/OT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and industrial wireless sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-012/OT 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811/12 family was designed specifically for ultra-low-power, long-life battery and energy-harvesting applications - emphasizing nanoscale quiescent current, ceramic-capacitor stability, and integrated power-management features like output discharge.
FAQ
What is the maximum input voltage rating for the MCP1812BT-012/OT?
The MCP1812BT-012/OT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate thermal limits, especially in the SOT-23-3 package where power dissipation is constrained.
Does the MCP1812BT-012/OT require an external shutdown resistor?
No, the MCP1812BT-012/OT does not require an external pull-up resistor on the SHDN pin. The device operates normally when SHDN is left open or pulled high to VIN; it enters shutdown only when SHDN is driven to GND. Internal logic ensures reliable state detection without external biasing components.
Can the MCP1812BT-012/OT be used with a 1 µF output capacitor?
No - the MCP1812BT-012/OT requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as confirmed in the datasheet's "Stable with Ceramic Output Capacitor" specification. Using 1 µF risks oscillation or poor transient response, particularly under 300 mA load steps.
What is the thermal resistance (θJA) of the MCP1812BT-012/OT in SOT-23-3?
The MCP1812BT-012/OT in 3-Lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard PCB layout; actual performance improves with added copper pour and thermal vias beneath the package.
Is the output voltage of the MCP1812BT-012/OT adjustable?
No, the MCP1812BT-012/OT provides a factory-trimmed fixed 1.2 V output. It belongs to Microchip's fixed-voltage LDO family and contains no feedback resistors or adjustment pins. For adjustable output, consider the MCP1801 series or other members with VADJ pin configuration.
MCP1812BT-012/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 1.2V
- 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:
- SOT-23-5
MCP1812BT-012/OT FAQ
1.How can I place an order for MCP1812BT-012/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-012/OT 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-012/OT reliable?
The price and inventory of MCP1812BT-012/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812BT-012/OT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-012/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-012/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-012/OT?
MCP1812BT-012/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-012/OT 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-012/OT?
For technical support, including MCP1812BT-012/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-012/OT requirements.
6.How does Aetrix verify that MCP1812BT-012/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-012/OT 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-012/OT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-012/OT?
All MCP1812BT-012/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-012/OT, 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-012/OT part is unused and in its original packaging.
Return procedure for MCP1812BT-012/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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