My Inquiry
My Account
Microchip Technology MCP1812BT-028/TT
- Part No.:
- MCP1812BT-028/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812BT-028/TT.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1812BT-028/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 2.8 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. It operates across 1.8V–5.5V input and supports long-life battery-powered systems requiring precise low-voltage rail regulation.
For engineers reviewing the MCP1812BT-028/TT datasheet, MCP1812BT-028/TT pinout, MCP1812BT-028/TT application, or MCP1812BT-028/TT equivalent, this page delivers verified electrical specs, thermal performance data, package mapping, functional role in energy-constrained systems, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1812BT-028/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and minimal ground current (180–220 µA over full load range). Its internal error amplifier and reference are optimized for stability with small ceramic capacitors and maintain ±25 mV load regulation up to 300 mA.
Shutdown control is active-low via the SHDN pin, drawing only 5 nA typical in shutdown mode (MCP1812B variant), and includes an integrated discharge transistor (RDCH = 100 Ω) to rapidly deplete output capacitance when disabled - critical for system-level power sequencing in wearables and medical sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures stable supply for 2.8 V logic rails (e.g., BLE SoCs, sensor ADCs) without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., RF transceivers, display drivers) while maintaining ultra-low IQ. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in sleep-dominated duty cycles. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation down to VIN = 3.2 V, maximizing usable battery voltage range. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.2 V), and USB-powered systems. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-noise designs without electrolytic or tantalum components. |
| Shutdown Current | 5 nA typical - reduces standby leakage to negligible levels in always-on monitoring applications. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for PSRR and transient response. |
| VOUT | Regulated output | Delivers fixed 2.8 V; must connect ≥2.2 µF X7R ceramic capacitor directly to GND for stability and noise suppression. |
| GND | Ground reference | Low-impedance return path for regulator core and output capacitor; tie to quiet ground plane or output cap cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables >10-year battery life in 1% duty-cycle IoT endpoints. |
| Integrated output discharge | 100 Ω discharge transistor actively pulls VOUT to GND during shutdown, preventing floating rails and enabling fast wake-up sequencing. |
| Ceramic-capacitor stability | Stable with 2.2 µF X7R ceramic output cap - eliminates ESR requirements and reduces BOM cost/size vs. tantalum solutions. |
| Wide input voltage range | 1.8–5.5 V operation supports direct connection to primary batteries, USB, or intermediate DC-DC outputs without pre-regulation. |
| Overcurrent protection | Foldback current limiting (100 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
Applications
| Wearable Health Sensors | Energy-Harvesting Nodes |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring in smart patches powered by thin-film batteries. IC Role / Device Role / Timing Role: Primary 2.8 V supply for analog front-end and BLE radio, regulated from variable harvested voltage. Use Value: 250 nA quiescent current extends operational lifetime beyond 3 years on 20 mAh microbattery; output discharge ensures clean reset between measurement bursts. | Use Scenario: Wireless soil moisture sensor powered by solar cell + supercapacitor. IC Role / Device Role / Timing Role: Low-voltage LDO delivering stable 2.8 V to MCU and RF transceiver during intermittent energy availability. Use Value: 1.8 V minimum input enables regulation even as supercap drops below 2.0 V; 5 nA shutdown current minimizes overnight leakage. |
| Hearing Aid Processors | Smart Card Controllers |
Use Scenario: Miniaturized rechargeable hearing aid using 3.7 V Li-Poly with 2.8 V DSP core. IC Role / Device Role / Timing Role: Main power regulator for ultra-low-power audio processor and MEMS microphone biasing. Use Value: 400 mV dropout preserves >90% of battery capacity; 2.2 µF ceramic cap fits tight PCB real estate without compromising stability. | Use Scenario: Contactless payment card with embedded secure MCU and NFC interface. IC Role / Device Role / Timing Role: Fixed 2.8 V supply for secure element and RF frontend, activated only during transaction. Use Value: 5 nA shutdown current meets ISO/IEC 14443 power budget limits; fast 400 µs startup ensures responsive tap-to-pay latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-2802E/TT | Same 2.8 V output, 300 mA rating, and SOT-23 package; differs in shutdown behavior - MCP1812-2802E/TT is MCP1812B variant (no output discharge), while MCP1812BT-028/TT is MCP1812A (with discharge). | Lacks integrated VOUT discharge; requires external circuitry if rapid rail collapse is needed for system reset. | Select MCP1812-2802E/TT only when discharge functionality is unnecessary and lowest possible shutdown IQ (5 nA) is prioritized over sequencing control. |
| Torex XC6210B282MR-G | 2.8 V, 300 mA, 250 nA IQ, SOT-23-3, but no output discharge; dropout 300 mV (lower), PSRR –50 dB @ 1 kHz (same), and requires 1 µF output cap. | Higher PSRR margin at high frequencies; no discharge path - unsuitable for applications needing controlled VOUT decay. | Choose XC6210B282MR-G where tighter dropout or higher-frequency ripple rejection is critical, and external discharge can be implemented. |
Compared with MCP1812-2802E/TT and XC6210B282MR-G, the MCP1812BT-028/TT uniquely combines 300 mA capability, 250 nA IQ, and integrated output discharge in a standard SOT-23 footprint - making it optimal for space-constrained, battery-sensitive systems requiring deterministic power-down behavior.
Availability
MCP1812BT-028/TT is available at Aetrix Electronics and suitable for wearable electronics, medical sensors, and energy-harvesting nodes requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1812BT-028/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 leading provider of microcontrollers, analog devices, and timing solutions, with deep expertise in ultra-low-power design and mixed-signal integration.
The MCP1811/12 family was engineered specifically for energy-constrained applications - delivering industry-leading 250 nA quiescent current while maintaining 300 mA output capability and robust transient response in miniature packages.
FAQ
What is the maximum continuous output current of the MCP1812BT-028/TT?
The MCP1812BT-028/TT delivers a maximum continuous output current of 300 mA, verified across its operating temperature range (–40°C to +85°C) and input voltage range (1.8 V to 5.5 V). This rating assumes adequate PCB copper area and thermal vias per Microchip's recommended layout for the 3-lead SOT-23 package to maintain junction temperature ≤85°C under full load.
Does the MCP1812BT-028/TT include output discharge functionality?
Yes, the MCP1812BT-028/TT includes an integrated discharge transistor (RDCH = 100 Ω typical) that actively pulls the VOUT pin to GND when the SHDN pin is driven low. This feature is confirmed in the device family designation "MCP1812A" (where "A" denotes output discharge), and is documented in DS20006088C, Figure 1-1 and Table 1.
What output capacitor value is required for stability with the MCP1812BT-028/TT?
The MCP1812BT-028/TT requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability, as specified in the Electrical Characteristics table (page 4) and Applications section (page 1) of DS20006088C. Lower values may cause oscillation or degraded PSRR; 2.2 µF provides optimal phase margin and low-noise performance across temperature and load conditions.
What is the typical dropout voltage of the MCP1812BT-028/TT at full load?
The typical dropout voltage of the MCP1812BT-028/TT is 400 mV at 300 mA output current and +25°C, as stated in the Electrical Characteristics table (page 4, VDROPOUT parameter). This enables regulation from as low as 3.2 V input while delivering 2.8 V output - extending usable battery voltage range in single-cell systems.
Is the MCP1812BT-028/TT compatible with ceramic input capacitors?
Yes, the MCP1812BT-028/TT is fully compatible with ceramic input capacitors. The datasheet specifies a 1 µF ceramic (X7R) input capacitor placed close to the VIN and GND pins to ensure stable operation, suppress high-frequency noise, and improve transient response - no minimum ESR requirement applies.
MCP1812BT-028/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):
- 2.8V
- 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:
- SOT-23-3
MCP1812BT-028/TT FAQ
1.How can I place an order for MCP1812BT-028/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-028/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-028/TT reliable?
The price and inventory of MCP1812BT-028/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-028/TT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-028/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-028/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-028/TT?
MCP1812BT-028/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-028/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-028/TT?
For technical support, including MCP1812BT-028/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-028/TT requirements.
6.How does Aetrix verify that MCP1812BT-028/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-028/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-028/TT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-028/TT?
All MCP1812BT-028/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-028/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-028/TT part is unused and in its original packaging.
Return procedure for MCP1812BT-028/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1812BT-028/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…
