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Microchip Technology MCP1812AT-028/TT
- Part No.:
- MCP1812AT-028/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-028/TT.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
MCP1812AT-028/TT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 2.8 V output, 250 nA typical IQ, 1.8–5.5 V input range, and stable operation with 2.2 µF ceramic output capacitor - designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1812AT-028/TT datasheet, MCP1812AT-028/TT pinout, MCP1812AT-028/TT application, or MCP1812AT-028/TT equivalent, this page delivers verified electrical specs, package mapping to SOT-23-5, shutdown behavior (10 nA ISHDN), dropout voltage (400 mV @ 300 mA), and real-world use context for ultra-low-power system design.
Technical Context
The MCP1812AT-028/TT implements a low-dropout linear regulation architecture with internal error amplifier, current-limit protection, and integrated discharge transistor (DT) active during shutdown (SHDN = GND). Its feedback network is factory-trimmed for 2.8 V output, eliminating external resistors.
It operates across –40°C to +85°C junction temperature, supports dynamic load steps up to 300 mA with <100 µs recovery (per Figure 2-22), and maintains PSRR ≥–50 dB at 1 kHz under full load - enabling clean power delivery in noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - eliminates need for external feedback resistors; compatible with 2.8 V logic rails and low-voltage sensors. |
| Max Output Current | 300 mA continuous - sufficient to power microcontrollers, BLE radios, and sensor arrays in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode-dominated applications (e.g., coin-cell-powered IoT nodes). |
| Shutdown Current | 10 nA typical (MCP1812A variant) - ensures near-zero leakage during deep-sleep or storage modes. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion, LiFePO₄, alkaline, and NiMH sources without pre-regulation. |
| Dropout Voltage | 400 mV max @ 300 mA - allows regulation down to 3.2 V input when delivering 2.8 V, maximizing usable battery capacity. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low ESR, and high-frequency noise suppression without tantalum or electrolytic parts. |
Pinout & Package
Package: 5-Lead SOT-23 (SC-74A), JEDEC MO-178AC, 2.9 mm × 1.6 mm × 1.1 mm body, exposed thermal pad optional per Microchip DS20006088C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor close to pin for stability and transient response. |
| SHDN | Active-low enable/disable control | Pulled high internally; driven low to enter 10 nA shutdown mode with output discharge enabled (MCP1812A). |
| NC | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout guidelines - no routing or soldering required. |
| VOUT | Regulated output | Delivers stable 2.8 V; requires 2.2 µF X7R ceramic capacitor directly at pin to ensure loop stability and low noise. |
| GND | Power ground reference | Low-impedance return path for load and quiescent current; tie to quiet ground plane and output capacitor cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 (225 mAh) in duty-cycled sensor nodes drawing 1 µA average. |
| Output discharge on shutdown | Drains VOUT to GND via internal 100 Ω transistor when SHDN = GND - prevents residual voltage from powering downstream circuitry. |
| Ceramic-capacitor stability | Eliminates need for high-ESR tantalum capacitors; reduces BOM cost, board area, and failure risk from aging or bias effects. |
| Overcurrent foldback | Limits short-circuit current to ~100 mA (at RLOAD = 1 Ω), protecting both regulator and source in fault conditions. |
| PSRR ≥–50 dB @ 1 kHz | Attenuates switching noise from DC-DC converters or digital ICs upstream, preserving signal integrity in ADC and RF sections. |
Applications
| Energy Harvesting Node | Hearing Aid Power Management |
|---|---|
Use Scenario: Indoor light or thermal energy harvester powering a sub-10 µA MCU and BLE transmitter. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.8 V to MCU core and radio during intermittent burst transmission. Use Value: 250 nA IQ extends usable harvest time between bursts; 2.2 µF ceramic cap fits tight space constraints. |
Use Scenario: Rechargeable zinc-air battery (1.2–1.4 V open-circuit) boosted to 3.3 V, then post-regulated to 2.8 V for analog front-end. IC Role / Device Role / Timing Role: Final-stage LDO supplying ultra-clean 2.8 V to microphone preamp and audio codec. Use Value: Low noise (<223 µVrms) and high PSRR prevent audible hiss; 300 mA headroom supports peak DSP loads. |
| Smart Watch Sensor Hub | Implantable Medical Sensor |
Use Scenario: Multi-sensor hub (accelerometer, HRM, SpO₂) operating in 10 s wake-up cycles with 99.9% sleep duty cycle. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.8 V rail while MCU sleeps; activated by interrupt-driven wake-up. Use Value: 10 nA shutdown current minimizes standby drain; fast 400 µs startup (TDELAY) ensures responsive wake-up. |
Use Scenario: Miniaturized neural sensor node powered by hermetically sealed lithium battery, requiring >7-year operational life. IC Role / Device Role / Timing Role: Single-point-of-regulation for analog sensing chain and ultra-low-power transceiver. Use Value: Guaranteed –40°C to +85°C operation supports body-temperature environments; 125°C max TJ rating enables safe sterilization margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B282MR-G | 280 mA max output, 250 nA IQ, same 2.8 V output, but no output discharge; SOT-25 package (5-pin, same footprint). | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during shutdown. | Select when discharge function is unnecessary and Torex's tighter initial accuracy (±1%) is prioritized over Microchip's robustness in wide-temp industrial use. |
| Ricoh RP114K281D-TR-F | 300 mA output, 250 nA IQ, 2.8 V output, includes discharge, but rated only to +75°C ambient (vs. +85°C for MCP1812AT-028/TT). | Not qualified for extended-temperature medical or automotive cabin applications. | Prefer for consumer wearables with controlled thermal environment; avoid where full –40°C to +85°C operation is mandatory. |
Compared with XC6210B282MR-G and RP114K281D-TR-F, the MCP1812AT-028/TT uniquely combines guaranteed 300 mA output, 10 nA shutdown, output discharge, and full industrial temperature range - making it the only option qualified for safety-critical, long-life, wide-temperature embedded systems.
Availability
MCP1812AT-028/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, hearing aid power management, and smart watch sensor hubs requiring stable component supply with traceable lot history and no obsolescence risk through 2030.
Supply support for MCP1812AT-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 Inc. is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona, serving industrial, automotive, and medical markets since 1989.
The MCP181X/12X family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge functionality.
FAQ
What is the maximum input voltage rating for the MCP1812AT-028/TT?
The MCP1812AT-028/TT has an absolute maximum input voltage of +6.0 V per its datasheet (DS20006088C, page 4). However, the recommended operating range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or accelerated parametric drift, even if within the absolute maximum limit.
Does the MCP1812AT-028/TT require an external pull-up resistor on the SHDN pin?
No - the MCP1812AT-028/TT includes an internal pull-up to VIN on the SHDN pin. An external resistor is not required for basic enable/disable operation. However, if precise timing control or noise immunity is needed, a 1 MΩ external pull-up (as shown in Figure 2-44) may be used to reinforce the internal bias.
Can the MCP1812AT-028/TT operate with a 1 µF output capacitor?
No - the MCP1812AT-028/TT requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as specified in the datasheet (page 1, "Stable with Ceramic Output Capacitor: … 2.2 µF (MCP1812X)"). Using 1 µF may cause oscillation or poor transient response, especially at full 300 mA load.
Is the MCP1812AT-028/TT pin-compatible with other variants in the MCP1812X family?
Yes - all MCP1812X devices (e.g., MCP1812AT-180/TT, MCP1812AT-330/TT) share identical 5-lead SOT-23 pinout and package dimensions. Only the output voltage and internal trim differ; no PCB redesign is needed when changing fixed-output variants.
What is the thermal resistance (θJA) of the MCP1812AT-028/TT in its SOT-23-5 package?
The MCP1812AT-028/TT in 5-Lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 184.82°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper (DS20006088C, page 6). Layout with thermal vias under the exposed pad (if present) can reduce this value significantly.
MCP1812AT-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
MCP1812AT-028/TT FAQ
1.How can I place an order for MCP1812AT-028/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-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 MCP1812AT-028/TT reliable?
The price and inventory of MCP1812AT-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 MCP1812AT-028/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-028/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-028/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-028/TT?
MCP1812AT-028/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-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 MCP1812AT-028/TT?
For technical support, including MCP1812AT-028/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-028/TT requirements.
6.How does Aetrix verify that MCP1812AT-028/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-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 MCP1812AT-028/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-028/TT?
All MCP1812AT-028/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-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 MCP1812AT-028/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-028/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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