My Inquiry
My Account
Microchip Technology MCP1812AT-040/TT
- Part No.:
- MCP1812AT-040/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-040/TT.pdf
- Description:
- IC REG LINEAR 4V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,554
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1812AT-040/TT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO linear regulator with fixed 4.0 V output, 250 nA typical IQ, and 400 mV typical dropout at full load. It operates from 2.4 V to 5.5 V input and supports ceramic output capacitors as small as 2.2 µF. Designed for energy harvesting and long-life battery-powered medical wearables.
For engineers reviewing the MCP1812AT-040/TT datasheet, MCP1812AT-040/TT pinout, MCP1812AT-040/TT application, or MCP1812AT-040/TT equivalent, this page delivers verified electrical specs, package mapping, shutdown behavior, output discharge capability, and real-world use-case validation - all aligned to DS20006088C.
Technical Context
The MCP1812AT-040/TT belongs to the MCP1812A variant group, featuring active output discharge during shutdown (SHDN = GND) and 300 mA continuous output current. Its internal error amplifier and PMOS pass device enable stable regulation with low noise and high PSRR up to –50 dB at 1 kHz.
It uses a fixed-output architecture with no external feedback resistors, requiring only VIN, VOUT, GND, and SHDN connections. The device maintains ±25 mV load regulation across 1 mA–300 mA and ±20 mV line regulation over its valid input range, supporting ultra-low-power sleep modes in XLP-class systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - eliminates need for external resistor divider; ensures compatibility with 3.3 V/5 V logic interfaces and analog sensors requiring stable 4 V bias. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, ADCs, display drivers) without thermal derating under typical ambient conditions. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in always-on sensing nodes with periodic wake-up cycles. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to 4.4 V input while maintaining regulated 4.0 V output, critical for aging battery applications. |
| Shutdown Current | 10 nA typical - reduces system standby power to sub-nW levels when paired with microcontroller-controlled SHDN signaling. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-ESR, low-noise filtering; avoids tantalum or electrolytic alternatives and simplifies layout. |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters, preserving signal integrity in mixed-signal sensor front-ends. |
Pinout & Package
Package: 3-Lead SOT-23 - surface-mount, 2.92 mm × 1.3 mm footprint, JEDEC standard, suitable for high-density wearable PCBs with minimal thermal mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4–5.5 V; must be decoupled with ≥1 µF ceramic capacitor close to pin to prevent instability during load transients. |
| VOUT | Regulated output | Delivers fixed 4.0 V; requires 2.2 µF ceramic output capacitor tied directly to GND for stability and low noise. |
| GND | Ground reference | Low-impedance return path for both input and output currents; should connect to quiet ground plane near output capacitor. |
| SHDN | Active-low enable control | Pulled high internally; driven low to enter 10 nA shutdown mode with active output discharge (DT switch pulls VOUT to GND). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices drawing <1 µA average current, such as environmental monitors powered by Li-SOCl₂ cells. |
| Output discharge on shutdown | Drives VOUT to GND within microseconds when SHDN is asserted, preventing floating outputs that could cause downstream latch-up or leakage. |
| Stable with 2.2 µF ceramic cap | Reduces BOM count and board area vs. legacy LDOs requiring ≥10 µF tantalum; improves reliability and temperature stability. |
| 400 mV dropout @ 300 mA | Permits direct regulation from single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) sources without intermediate buck conversion. |
| –50 dB PSRR @ 1 kHz | Mitigates ripple from switching regulators sharing the same input rail, enabling clean analog supply for precision ADCs or RF ICs. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
|
Use Scenario: Indoor light-harvesting circuit powering a low-duty-cycle temperature/humidity sensor with BLE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator converting variable 2.5–4.5 V harvested voltage to stable 4.0 V for MCU and radio. Use Value: 250 nA quiescent current minimizes parasitic drain during 99.9% sleep time; 300 mA peak supports instantaneous BLE burst transmission. |
Use Scenario: Rechargeable hearing aid using a 3.7 V Li-ion cell with firmware-controlled deep-sleep mode between audio processing cycles. IC Role / Device Role / Timing Role: System LDO supplying 4.0 V to DSP and MEMS microphone; SHDN controlled by host MCU to cut off power during silence intervals. Use Value: 10 nA shutdown current extends usable runtime per charge; output discharge prevents residual voltage from interfering with analog front-end reset timing. |
| Implantable Medical Sensor | Industrial Wireless Sensor Tag |
|
Use Scenario: Subcutaneous glucose monitor with 10-year target service life, powered by hermetically sealed lithium battery. IC Role / Device Role / Timing Role: Single-point voltage regulator delivering precise 4.0 V to electrochemical sensor interface and ultra-low-power MCU. Use Value: ±4% output tolerance and <±25 mV load regulation ensure consistent sensor biasing across full battery discharge curve and temperature range (–40°C to +85°C). |
Use Scenario: DIN-rail mounted vibration sensor transmitting data via LoRaWAN every 15 minutes in factory environments. IC Role / Device Role / Timing Role: Main regulator for microcontroller, accelerometer, and LoRa transceiver; operates from wide-input industrial 3.3–5.5 V supply. Use Value: 4.4 V minimum input requirement allows direct connection to 5 V backplane without pre-regulation; SOT-23 package supports conformal coating for dust/moisture protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-040/OT | Same electrical specs and pinout, but in 3-Lead SC70 package (1.25 mm × 1.25 mm); 300.6°C/W θJA vs. 211.3°C/W for SOT-23. | Preferred where board space is more constrained than thermal margin; lower thermal performance limits sustained 300 mA operation in enclosed enclosures. | Select MCP1812AT-040/OT only when footprint reduction outweighs thermal derating requirements. |
| Torex XC6210B402MR-G | 4.0 V fixed output, 300 mA, 250 nA IQ, but no output discharge; shutdown current 50 nA (vs. 10 nA); requires 1 µF ceramic cap. | Suitable for cost-sensitive consumer wearables where output discharge is not required and slightly higher shutdown leakage is acceptable. | Choose XC6210B402MR-G if board-level discharge circuitry exists or if lowest possible BOM cost is prioritized over shutdown-state leakage. |
Compared with MCP1812AT-040/OT, the /TT variant offers superior thermal dissipation in space-constrained layouts; compared with XC6210B402MR-G, it provides tighter shutdown control and integrated discharge-critical for medical and industrial safety-critical power sequencing.
Availability
MCP1812AT-040/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, implantable medical sensors, and industrial wireless sensor tags requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for MCP1812AT-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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and interface products, with strong focus on low-power and embedded control solutions.
The MCP1811/12 family was designed specifically for ultra-low-power, long-life battery-operated systems - emphasizing nanoscale quiescent current, minimal external components, and robust operation across extended temperature ranges.
FAQ
What is the maximum input voltage rating for the MCP1812AT-040/TT?
The MCP1812AT-040/TT has an absolute maximum input voltage of +6.0 V. However, its operational input range is specified from 2.4 V to 5.5 V for 300 mA output. Exceeding 5.5 V may trigger overvoltage stress and reduce reliability, even if within absolute max ratings.
Does the MCP1812AT-040/TT require an external pull-up resistor on the SHDN pin?
No - the MCP1812AT-040/TT includes an internal pull-up on the SHDN pin. An external resistor is unnecessary unless specific timing control or noise immunity is needed; the internal pull-up ensures default-enable operation upon power-up.
Can the MCP1812AT-040/TT be used with a 1 µF output capacitor instead of the recommended 2.2 µF?
No - the MCP1812AT-040/TT is only guaranteed stable with ≥2.2 µF ceramic output capacitance. Using 1 µF may cause oscillation or poor transient response, especially at 300 mA loads. The 2.2 µF value is validated in DS20006088C for all operating conditions.
Is the output discharge feature of the MCP1812AT-040/TT controllable or automatic?
The output discharge is automatic and intrinsic to the MCP1812AT-040/TT's design as an MCP1812A-series device. When SHDN is pulled low, the internal discharge transistor (RDCH ≈ 100 Ω) activates immediately, pulling VOUT to GND without requiring additional control signals or external components.
What is the thermal resistance (θJA) of the MCP1812AT-040/TT in its SOT-23 package?
The MCP1812AT-040/TT in 3-Lead SOT-23 has a thermal resistance θJA of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices - adding thermal vias under the pad can improve heat dissipation by up to 30%.
MCP1812AT-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
MCP1812AT-040/TT FAQ
1.How can I place an order for MCP1812AT-040/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-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 MCP1812AT-040/TT reliable?
The price and inventory of MCP1812AT-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 MCP1812AT-040/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-040/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-040/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-040/TT?
MCP1812AT-040/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-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 MCP1812AT-040/TT?
For technical support, including MCP1812AT-040/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-040/TT requirements.
6.How does Aetrix verify that MCP1812AT-040/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-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 MCP1812AT-040/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-040/TT?
All MCP1812AT-040/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-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 MCP1812AT-040/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-040/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1812AT-040/TT Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
