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Microchip Technology MCP1812BT-040/LT
- Part No.:
- MCP1812BT-040/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812BT-040/LT.pdf
- Description:
- IC REG LINEAR 4V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
MCP1812BT-040/LT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 4.0 V low-dropout linear regulator in a 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with only 2.2 µF ceramic output capacitance - ideal for battery-powered wearable electronics and energy harvesting systems.
For engineers reviewing the MCP1812BT-040/LT datasheet, MCP1812BT-040/LT pinout, MCP1812BT-040/LT application, or MCP1812BT-040/LT equivalent, key selection criteria include its 4.0 V output voltage accuracy (±4%), 400 mV dropout at 300 mA, 5 nA shutdown current (MCP1812B variant), and compatibility with low-noise, space-constrained ultra-low-power designs.
Technical Context
The MCP1812BT-040/LT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast transient response. Its internal error amplifier maintains regulation across –40°C to +85°C junction temperature while supporting input voltages from 2.4 V to 5.5 V at full 300 mA load.
It integrates an active discharge transistor (RDCH = 100 Ω typical) tied to the SHDN pin, enabling rapid VOUT collapse when disabled - a critical feature for power sequencing in multi-rail systems and leakage-sensitive medical devices like hearing aids.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures stable supply for 3.3 V–4.2 V logic rails without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, sensors) in compact wearables. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-dominated applications (e.g., smart tags). |
| Shutdown Current | 5 nA typical - meets stringent zero-power standby requirements in energy-harvesting nodes. |
| Dropout Voltage | 400 mV at 300 mA - allows operation down to 4.4 V input, extending usable battery range in single-cell Li-ion systems. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and PCB area vs. electrolytic alternatives; lowers output noise. |
| PSRR | –50 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters in mixed-power-supply designs. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm profile, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.4 V–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for stability and noise rejection. |
| VOUT | Regulated output | Delivers fixed 4.0 V; must be decoupled with ≥2.2 µF X7R ceramic capacitor directly to GND for loop stability. |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; tie to quiet analog ground plane or output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low shutdown current | 5 nA typical enables >10-year shelf life in sealed battery-powered medical devices. |
| Output discharge on shutdown | Active discharge transistor (100 Ω) pulls VOUT to GND within microseconds - prevents backfeeding and ensures clean power-down sequencing. |
| Ceramic-capacitor stability | Validated with 2.2 µF X7R ceramic only - eliminates ESR dependency, improves reliability, and reduces footprint vs. tantalum solutions. |
| Wide input voltage range | Operates from 2.4 V (at 300 mA load) to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, and USB-powered systems. |
| High PSRR at low frequency | –50 dB @ 1 kHz with no input capacitor - simplifies layout in noise-sensitive analog signal chains (e.g., sensor front-ends). |
Applications
| Wearable Health Monitors | Energy-Harvesting Sensor Nodes |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn patches powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary 4.0 V power rail for ultra-low-power MCU and analog front-end. Use Value: 250 nA quiescent current extends battery life beyond 3 years; output discharge prevents sensor bias drift during sleep mode transitions. | Use Scenario: Wireless environmental sensor node powered by solar cell + supercapacitor. IC Role / Device Role / Timing Role: Stable 4.0 V supply for RF transceiver and microcontroller during intermittent energy availability. Use Value: 5 nA shutdown current minimizes leakage loss during dark periods; 400 mV dropout maximizes usable energy from low-voltage storage. |
| Hearing Aids | Smart Cards with Secure Elements |
Use Scenario: Miniature in-the-ear hearing aid requiring silent, reliable power with zero wake-up latency. IC Role / Device Role / Timing Role: Always-on 4.0 V regulator for audio codec and DSP core. Use Value: Fast start-up (<400 µs) and low noise (165.65 µVrms) preserve audio fidelity; SOT-23 footprint fits constrained acoustic cavities. | Use Scenario: Contactless payment card with embedded secure microcontroller and NFC interface. IC Role / Device Role / Timing Role: Low-leakage 4.0 V supply enabling secure boot and cryptographic operations during brief field exposure. Use Value: 5 nA shutdown current prevents battery drain between transactions; ±4% output tolerance meets ISO/IEC 7816-3 voltage compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-4002E/MB | Same 4.0 V output, 300 mA rating, and 5 nA shutdown current; differs in package (5-lead SOT-23 with SHDN pin) and lacks output discharge. | Requires external pull-up on SHDN; no integrated discharge transistor - unsuitable where rapid VOUT collapse is required. | Select when board-level control of enable timing is preferred and discharge is handled externally. |
| Torex XC6210B402MR-G | 4.0 V output, 300 mA, 250 nA IQ, but 25 nA shutdown current (vs. 5 nA); no output discharge; uses 1.0 µF ceramic stability. | Higher shutdown leakage may reduce shelf life in long-storage medical disposables; no discharge function limits use in strict sequencing systems. | Choose for cost-sensitive, non-sequencing applications where 25 nA shutdown is acceptable and smaller output cap is desired. |
Compared with MCP1812-4002E/MB and XC6210B402MR-G, the MCP1812BT-040/LT uniquely combines 3-lead simplicity, 5 nA shutdown, and integrated output discharge - making it optimal for space- and leakage-critical single-rail wearables and disposable medical sensors.
Availability
MCP1812BT-040/LT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical device applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP1812BT-040/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 components, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets.
The MCP181X/12X product line delivers ultra-low-power LDO regulators optimized for battery longevity in space-constrained, always-on edge devices - especially where nanoscale quiescent current and precise low-voltage regulation are mandatory.
FAQ
What is the maximum input voltage rating for the MCP1812BT-040/LT?
The MCP1812BT-040/LT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 2.4 V to 5.5 V at full 300 mA load. Exceeding 5.5 V may cause permanent damage or violate thermal limits, especially in the SOT-23 package with its 211.33°C/W junction-to-ambient thermal resistance.
Does the MCP1812BT-040/LT require an external shutdown control signal?
No - the MCP1812BT-040/LT is an MCP1812B variant and does not include a dedicated SHDN pin. It operates in always-on mode with no enable control. The "BT" suffix denotes the 3-lead SOT-23 package without shutdown functionality, unlike 5-lead versions such as MCP1812-4002E/MB. Therefore, MCP1812BT-040/LT cannot be externally disabled.
What output capacitor value is required for stability with the MCP1812BT-040/LT?
The MCP1812BT-040/LT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability across temperature and load conditions. This value is validated per Microchip's DS20006088C specification and accounts for the device's higher output current capability (300 mA) versus the 1.0 µF requirement for 150 mA MCP1811X variants.
Is the MCP1812BT-040/LT compatible with lithium coin-cell batteries?
Yes - the MCP1812BT-040/LT supports input voltages as low as 2.4 V at 300 mA, matching the discharge curve of CR2032 (2.0–3.0 V) and BR2032 (2.6–3.0 V) cells. Its 250 nA quiescent current and absence of enable pin make it ideal for direct connection to coin cells in maintenance-free, long-life applications like smart packaging or RFID tags.
How does the output voltage accuracy of the MCP1812BT-040/LT impact system-level design?
The MCP1812BT-040/LT provides ±4% output voltage accuracy over temperature and load, meaning its 4.0 V output remains within 3.84 V–4.16 V. This tolerance is sufficient for powering 3.3 V I/O-tolerant MCUs and analog sensors with headroom, but designers must verify downstream voltage margins - especially for 4.0 V-referenced ADCs or precision references - and avoid cascading multiple LDOs without margin analysis.
MCP1812BT-040/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):
- 4V
- 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-040/LT FAQ
1.How can I place an order for MCP1812BT-040/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-040/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-040/LT reliable?
The price and inventory of MCP1812BT-040/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-040/LT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-040/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-040/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-040/LT?
MCP1812BT-040/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-040/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-040/LT?
For technical support, including MCP1812BT-040/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-040/LT requirements.
6.How does Aetrix verify that MCP1812BT-040/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-040/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-040/LT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-040/LT?
All MCP1812BT-040/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-040/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-040/LT part is unused and in its original packaging.
Return procedure for MCP1812BT-040/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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