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Microchip Technology MCP1812BT-040/TT
- Part No.:
- MCP1812BT-040/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812BT-040/TT.pdf
- Description:
- IC REG LINEAR 4V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,159
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Product details
Overview
MCP1812BT-040/TT 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, designed for energy harvesting and long-life battery-powered systems requiring stable voltage under microampere load conditions.
For engineers reviewing the MCP1812BT-040/TT datasheet, MCP1812BT-040/TT pinout, MCP1812BT-040/TT application, or MCP1812BT-040/TT equivalent, key selection criteria include shutdown current (10 nA typical), dropout voltage (400–600 mV at 300 mA), ceramic capacitor stability (2.2 µF min), and thermal performance on JEDEC 4-layer board (θJA = 211.33°C/W).
Technical Context
The MCP1812BT-040/TT implements a PMOS pass transistor architecture enabling ultra-low IQ operation while maintaining regulation across 1.8–5.5 V input range. Its internal error amplifier drives the pass element with feedback from the 4.0 V output, supporting fast transient response and ±25 mV load regulation over 1–300 mA.
It features integrated overcurrent protection with foldback (100 mA at RLOAD = 1 Ω) and an active discharge transistor (RDCH = 100 Ω) that pulls VOUT to GND during SHDN assertion - a capability confirmed for MCP1812A variants including this /T suffix part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures compatibility with 3.3 V I/O logic rails when supplied from ≥4.2 V sources. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, sensors) without external boost stages. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications using CR2032 cells. |
| Dropout Voltage | 400–600 mV at 300 mA - allows operation down to 4.4 V input while sustaining 4.0 V output under full load. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.0 V), and USB-supplied (4.75–5.25 V) sources. |
| Shutdown Current | 10 nA typical - reduces system standby power to sub-nW levels when paired with microcontroller GPIO control. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-ESR filtering with <170 µVrms noise (10 Hz–100 kHz) at 4.0 V output. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.6 mm × 1.1 mm body, gull-wing leads, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass; traces must minimize inductance for PSRR integrity. |
| VOUT | Regulated output | Delivers 4.0 V ±4%; requires 2.2 µF X7R ceramic capacitor placed ≤2 mm from pin for stability. |
| GND | Ground reference | Low-impedance return path for both load and ground current (≤220 µA at 300 mA); tie directly to quiet ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables multi-year operation from coin cells in always-on sensor nodes. |
| Active output discharge | 100 Ω discharge transistor pulls VOUT to GND within microseconds upon SHDN assertion - prevents floating bias in downstream circuitry. |
| Ceramic capacitor stability | Stable with only 2.2 µF X7R ceramic output cap - eliminates need for larger, costlier tantalum or aluminum electrolytics. |
| Wide input voltage range | Operates from 1.8 V (single alkaline cell) up to 5.5 V (USB + margin) - simplifies power architecture across diverse battery chemistries. |
| Overcurrent foldback | Reduces short-circuit current to 100 mA - protects IC and source during fault conditions without thermal runaway. |
Applications
| Energy Harvesting Nodes | Medical Wearables |
|---|---|
Use Scenario: Indoor light-harvesting sensor node powering BLE transmitter and temperature sensor from amorphous silicon PV cell. IC Role / Device Role / Timing Role: Primary 4.0 V LDO delivering regulated rail to RF SoC and analog front-end during intermittent microwatt-to-milliwatt power availability. Use Value: 250 nA IQ minimizes dark-current drain; 2.2 µF ceramic stability enables ultra-thin PCB integration with no electrolytic height penalty. | Use Scenario: Hearing aid with rechargeable Li-ion battery and real-time audio processing ASIC. IC Role / Device Role / Timing Role: Main 4.0 V supply for DSP core and Class-D amplifier, activated only during audio playback bursts. Use Value: 10 nA shutdown current extends standby time between uses; 400 mV dropout preserves runtime as battery discharges from 4.2 V to 3.4 V. |
| Smart Card Readers | Industrial IoT Sensors |
Use Scenario: Contactless smart card reader powered by NFC field coupling, requiring rapid wake-up from nanoampere sleep. IC Role / Device Role / Timing Role: Fast-starting 4.0 V regulator supplying secure MCU and RF transceiver upon field detection. Use Value: 400 µs startup delay from SHDN ensures sub-millisecond system readiness; ±25 mV load regulation maintains digital logic margins during RF transmit peaks. | Use Scenario: Wireless vibration sensor node deployed in remote machinery, powered by primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Long-life 4.0 V regulator for ultra-low-power MCU and MEMS accelerometer, operating intermittently every 5 minutes. Use Value: 250 nA IQ enables >15-year battery life; -40°C to +85°C junction rating ensures reliability in uncontrolled industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-400/TT | Same 4.0 V output and 300 mA rating, but includes output discharge (MCP1812A variant); identical SOT-23 package and pinout. | Identical use cases; preferred where active VOUT discharge is required for system-level reset sequencing. | Select MCP1812AT-400/TT if output discharge is mandatory; otherwise MCP1812BT-040/TT offers same performance with simplified control logic. |
| Torex XC6210B402MR-G | 4.0 V fixed output, 300 mA, 250 nA IQ, but no output discharge; SOT-23-3 package with identical pin assignment (VIN-VOUT-GND). | Lacks discharge function; suitable for applications where VOUT float during shutdown is acceptable. | Choose XC6210B402MR-G only if Microchip supply continuity is constrained; verify PSRR (-50 dB @ 1 kHz) and dropout (500 mV) meet design margins. |
Compared with MCP1812AT-400/TT, the MCP1812BT-040/TT omits discharge but retains identical electrical specs and footprint - ideal for cost-sensitive designs where discharge adds no value. Versus XC6210B402MR-G, it offers guaranteed Microchip support and documented thermal resistance (211.33°C/W), critical for high-ambient deployments.
Availability
MCP1812BT-040/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical wearables, and industrial IoT sensors requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1812BT-040/TT 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 with vertically integrated silicon and software offerings.
The MCP181X/12X product line delivers ultra-low-power LDO regulators optimized for battery longevity in space-constrained, intermittently powered systems - specifically targeting energy harvesting, wearable, and implantable medical applications.
FAQ
What is the maximum input voltage rating for the MCP1812BT-040/TT?
The MCP1812BT-040/TT has an absolute maximum input voltage rating of +6.0 V. Operation beyond this limit risks permanent damage. For reliable continuous operation, the input voltage must remain within the specified functional range of 1.8 V to 5.5 V, with minimum VIN dependent on load current and dropout requirements - e.g., ≥4.4 V is required to sustain 4.0 V output at 300 mA.
Does the MCP1812BT-040/TT support output capacitor values smaller than 2.2 µF?
No - the MCP1812BT-040/TT requires a minimum 2.2 µF ceramic (X7R) output capacitor for guaranteed stability across all operating conditions. Using less capacitance may cause oscillation or poor transient response. The datasheet explicitly states 2.2 µF is mandatory for MCP1812X devices, unlike the 1.0 µF requirement for MCP1811X variants.
Is the MCP1812BT-040/TT pin-compatible with other members of the MCP181X/12X family in SOT-23?
Yes - the MCP1812BT-040/TT uses the standard 3-lead SOT-23 pinout (VIN, VOUT, GND) shared across all MCP1811A/B and MCP1812A/B variants in that package. This allows direct substitution within the same footprint, provided output voltage and discharge functionality align with system requirements.
What is the thermal resistance (θJA) of the MCP1812BT-040/TT in its SOT-23 package?
The MCP1812BT-040/TT has a thermal resistance θJA of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and no thermal vias. This value is critical for calculating junction temperature rise under load; for example, at 300 mA and 400 mV dropout, power dissipation is 120 mW, resulting in ~25.4°C rise above ambient.
How does the shutdown functionality work on the MCP1812BT-040/TT?
The MCP1812BT-040/TT does not include a dedicated SHDN pin - it is a 3-pin device (VIN/VOUT/GND) and lacks enable/disable control. Shutdown capability is exclusive to 5-lead variants (e.g., MCP1812A/B in SOT-23-5). The "B" suffix denotes no output discharge, and the /TT suffix confirms the 3-lead SOT-23 package without enable functionality.
MCP1812BT-040/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
MCP1812BT-040/TT FAQ
1.How can I place an order for MCP1812BT-040/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-040/TT 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/TT reliable?
The price and inventory of MCP1812BT-040/TT 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/TT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-040/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-040/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-040/TT?
MCP1812BT-040/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-040/TT 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/TT?
For technical support, including MCP1812BT-040/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-040/TT requirements.
6.How does Aetrix verify that MCP1812BT-040/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-040/TT 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/TT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-040/TT?
All MCP1812BT-040/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-040/TT, 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/TT part is unused and in its original packaging.
Return procedure for MCP1812BT-040/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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