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Microchip Technology MCP1812BT-018/LT
- Part No.:
- MCP1812BT-018/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812BT-018/LT.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,108
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Product details
Overview
MCP1812BT-018/LT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 1.8 V output, 250 nA typical IQ, and shutdown capability (5 nA typical ISHDN). It operates from 1.8 V to 5.5 V input and stabilizes with only 2.2 µF ceramic output capacitance. Designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1812BT-018/LT datasheet, MCP1812BT-018/LT pinout, MCP1812BT-018/LT application, or MCP1812BT-018/LT equivalent, this page delivers verified electrical specs, package mapping, functional role in low-power sleep/wake architectures, and validated alternative options for ultra-low-IQ LDO selection.
Technical Context
The MCP1812BT-018/LT 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 are optimized for stability with small ceramic capacitors and low-noise operation.
It features active output discharge during shutdown (MCP1812A variant), logic-compatible SHDN pin (70% VIN high threshold), and foldback current limiting (100 mA at RLOAD = 1 Ω). Thermal protection and overcurrent protection operate without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - enables direct powering of 1.8 V logic cores and low-voltage sensors without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, ADCs) while maintaining ultra-low IQ in sleep mode. |
| Quiescent Current | 250 nA typical - extends battery life in multi-year deployments (e.g., >10 years on CR2032 at 1 µA avg load). |
| Shutdown Current | 5 nA typical - ensures near-zero leakage during system deep-sleep states. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation down to 2.2 V input for 1.8 V output, maximizing usable battery range. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. electrolytic/tantalum; lowers output noise. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236AA), RoHS-compliant, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor for PSRR optimization. |
| VOUT | Regulated output | Delivers stable 1.8 V; must be decoupled with ≥2.2 µF X7R ceramic for loop stability and transient response. |
| GND | Power ground reference | Low-impedance return path for ground current (≤220 µA); tie directly to output capacitor ground pad. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 250 nA typical enables >10-year battery life in intermittent-sensing applications (e.g., environmental monitors). |
| Output discharge on shutdown | Active discharge transistor (RDCH = 100 Ω typical) clears VOUT within microseconds-prevents back-powering or latch-up in multi-rail systems. |
| Ceramic-capacitor stability | Stable with 2.2 µF X7R ceramic only-eliminates ESR requirements, reduces cost/size, and improves noise performance vs. tantalum. |
| Wide input voltage range | 1.8–5.5 V operation supports direct connection to harvested energy sources (e.g., solar, thermal) without pre-regulation. |
| Logic-compatible enable | SHDN pin accepts standard CMOS levels (VSHDN-HIGH ≥70% VIN); no external pull-up needed when driven by MCU GPIO. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
|
Use Scenario: Indoor light-harvesting sensor node collecting temperature/humidity data every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8 V to ultra-low-power MCU and RF transceiver during brief active bursts. Use Value: 250 nA IQ and 5 nA shutdown current maximize energy capture efficiency; 2.2 µF ceramic capacitor minimizes footprint on constrained PCB. |
Use Scenario: Rechargeable hearing aid using coin-cell backup with multi-week runtime between charges. IC Role / Device Role / Timing Role: Main LDO delivering regulated 1.8 V to DSP and MEMS microphone during audio processing and standby. Use Value: 400 mV dropout extends usable battery voltage down to 2.2 V; output discharge prevents signal corruption during power cycling. |
| Smart Wearable Bracelet | Industrial Wireless Sensor |
|
Use Scenario: Fitness tracker with optical heart-rate sensor, accelerometer, and BLE radio operating on single CR2032 cell. IC Role / Device Role / Timing Role: System LDO providing clean 1.8 V rail to analog front-end and digital subsystem during motion-triggered sampling. Use Value: Low noise (169 µVrms) ensures accurate analog measurements; 300 mA capability supports simultaneous sensor + radio burst transmission. |
Use Scenario: Battery-powered vibration monitor deployed in remote machinery with 5-year maintenance interval. IC Role / Device Role / Timing Role: Power management IC regulating 1.8 V for microcontroller and piezoelectric sensor interface in harsh industrial environments. Use Value: -40°C to +85°C junction rating ensures reliability under thermal stress; 4 kV HBM ESD rating protects against field handling damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 1.8 V fixed, 200 mA max, 1 µA IQ (typ), no shutdown, SOT-23-5 | Lacks enable/shutdown control and output discharge; lower current limit restricts use with RF transceivers. | Select when shutdown functionality is unnecessary and IQ <1 µA suffices; verify layout compatibility with 5-pin footprint. |
| Richtek RT9013-18GB | 1.8 V fixed, 300 mA max, 2.5 µA IQ (typ), shutdown (0.1 µA), SOT-23-5 | Higher IQ (10×) limits battery lifetime in multi-year deployments; same current capability and ceramic stability. | Choose for cost-sensitive designs where 2.5 µA IQ meets runtime targets; confirm thermal derating for continuous 300 mA loads. |
Compared with MCP1812BT-018/LT, the XC6210B182MR-G trades shutdown control and ultra-low IQ for simpler integration, while the RT9013-18GB offers identical current drive but sacrifices 10× more quiescent power-making MCP1812BT-018/LT optimal for decade-scale battery operation.
Availability
MCP1812BT-018/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable electronics requiring stable component supply and long-term lifecycle support.
Supply support for MCP1812BT-018/LT 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 microcontrollers, analog devices, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP181X/12X family was designed specifically for ultra-low-power, long-life battery and energy-harvesting applications-prioritizing nanoscale quiescent current, ceramic capacitor compatibility, and robust shutdown behavior over speed or high-current density.
FAQ
What is the maximum input voltage rating for the MCP1812BT-018/LT?
The MCP1812BT-018/LT has an absolute maximum input voltage rating of +6.0 V. Continuous operation above 5.5 V is not recommended. The device is specified for normal operation from 1.8 V to 5.5 V, with minimum input dependent on load: 2.4 V required for full 300 mA output at 1.8 V.
Does the MCP1812BT-018/LT require an external resistor divider for output voltage setting?
No. The MCP1812BT-018/LT is a fixed-output LDO with factory-trimmed 1.8 V regulation. It contains no feedback pins or external resistor connections-output voltage is internally set and does not require external components for adjustment.
Is the MCP1812BT-018/LT pin-compatible with other variants in the MCP1812X family?
Yes. All MCP1812X variants-including MCP1812BT-018/LT-share identical 3-lead SOT-23 pinout (VIN, VOUT, GND) and mechanical footprint. Voltage, current, and shutdown variants differ only in internal trimming and are drop-in replacements within the same package.
What is the thermal resistance (θJA) of the MCP1812BT-018/LT in its SOT-23 package?
The MCP1812BT-018/LT 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 practices; adding thermal vias or copper pour can reduce effective θJA.
Can the MCP1812BT-018/LT be used without an input bypass capacitor?
While functional without CIN, Microchip recommends a 1 µF ceramic capacitor at VIN for optimal PSRR and transient response. Omitting CIN degrades power supply ripple rejection-especially above 1 kHz-and increases susceptibility to line transients, which may affect sensitive analog circuitry powered by MCP1812BT-018/LT.
MCP1812BT-018/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 1.8V
- 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-70-5
MCP1812BT-018/LT FAQ
1.How can I place an order for MCP1812BT-018/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-018/LT 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-018/LT reliable?
The price and inventory of MCP1812BT-018/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812BT-018/LT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-018/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-018/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-018/LT?
MCP1812BT-018/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-018/LT 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-018/LT?
For technical support, including MCP1812BT-018/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-018/LT requirements.
6.How does Aetrix verify that MCP1812BT-018/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-018/LT 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-018/LT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-018/LT?
All MCP1812BT-018/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-018/LT, 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-018/LT part is unused and in its original packaging.
Return procedure for MCP1812BT-018/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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