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Microchip Technology MCP1812AT-018/TT
- Part No.:
- MCP1812AT-018/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1812AT-018/TT.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,720
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Product details
Overview
MCP1812AT-018/TT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 1.8 V output, 250 nA typical IQ, and shutdown capability (10 nA typical ISHDN). It operates from 1.8 V to 5.5 V input and supports ceramic output capacitors as small as 2.2 µF. It is designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1812AT-018/TT datasheet, MCP1812AT-018/TT pinout, MCP1812AT-018/TT application, or MCP1812AT-018/TT equivalent, this page delivers verified electrical specs, package mapping, functional role in low-power sleep/wake architectures, and validated alternative options for ultra-low-IQ LDO selection.
Technical Context
The MCP1812AT-018/TT belongs to the MCP1812X family - the 300 mA variant of Microchip's ultra-low-IQ LDO series. It integrates an output discharge transistor (DT) activated during shutdown (SHDN = GND), enabling rapid VOUT discharge to prevent residual voltage hold-up in sensitive power domains.
Its internal architecture maintains regulation down to 400 mV dropout at 300 mA load while sustaining ±25 mV load regulation and ±20 mV line regulation across its operating range. The device is stable with 2.2 µF X7R ceramic output capacitance and achieves –50 dB PSRR at 1 kHz without input capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures compatibility with 1.8 V logic rails and low-voltage microcontrollers. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, sensors) without external boost stages. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in deep-sleep modes. |
| Shutdown Current | 10 nA typical - reduces system standby leakage to sub-nA levels when paired with ultra-low-IQ controllers. |
| Dropout Voltage | 400 mV @ 300 mA - allows operation from single-cell Li-ion (3.0 V min) or two alkaline cells (2.4 V min) down to end-of-life. |
| Output Capacitor | 2.2 µF ceramic (X7R) - eliminates need for bulk electrolytic caps, reducing board area and cost. |
| PSRR | –50 dB @ 1 kHz (no CIN) - suppresses switching noise from adjacent DC/DC converters without input filtering. |
Pinout & Package
Package: 3-Lead SOT-23 - compact 2.92 mm × 1.3 mm footprint with exposed pad option (not present in /TT suffix); thermal resistance θJA = 211.33°C/W on JEDEC 4-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 1.8–5.5 V; must be decoupled locally to minimize PSRR degradation and startup overshoot. |
| VOUT | Regulated output | Delivers stable 1.8 V; requires ≥2.2 µF ceramic cap tied directly to GND for stability and transient response. |
| GND | Ground reference | Low-impedance return path for ground current only; tie to quiet ground plane or output cap return for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active DT switch pulls VOUT to GND within microseconds - prevents back-powering of upstream circuitry or false wake events. |
| Ultra-low IQ across temperature | 250 nA typ. from –40°C to +85°C - eliminates thermal derating concerns in sealed wearable enclosures. |
| Stable with minimal ceramic capacitance | 2.2 µF X7R suffices - avoids ESR dependency and aging issues of tantalum/electrolytic caps in long-life designs. |
| Wide input voltage range | 1.8–5.5 V - accommodates direct connection to harvested energy sources (e.g., solar, RF, thermal) without pre-regulation. |
| Overcurrent protection | Foldback limit at ~100 mA into 1 Ω - protects against short-circuit faults while limiting thermal stress during sustained overload. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
|
Use Scenario: Indoor light-harvesting sensor node powering BLE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8 V to ultra-low-power MCU and RF transceiver during active burst. Use Value: 250 nA IQ extends usable runtime per charge cycle by >3× versus standard LDOs; 2.2 µF output cap minimizes PCB area in space-constrained modules. |
Use Scenario: Rechargeable hearing aid using coin cell with 10-year target service life. IC Role / Device Role / Timing Role: Main voltage regulator for DSP core and audio codec during listening and processing phases. Use Value: 10 nA shutdown current prevents battery drain during storage; 400 mV dropout enables full utilization of cell voltage down to 1.9 V. |
| Smart Watch Core Rail | IoT Asset Tracker |
|
Use Scenario: Always-on motion detection subsystem waking main SoC on gesture event. IC Role / Device Role / Timing Role: Dedicated 1.8 V rail for accelerometer and ultra-low-power interrupt controller in deep-sleep mode. Use Value: Output discharge ensures clean reset of peripheral upon wake, eliminating latch-up risk from floating VOUT during transition. |
Use Scenario: GPS-enabled tracker reporting location every 6 hours via cellular modem. IC Role / Device Role / Timing Role: Power management IC regulating 1.8 V for GNSS receiver and secure element during brief active windows. Use Value: –50 dB PSRR at 1 kHz rejects noise from cellular PA without requiring ferrite beads or LC filters - simplifying layout and BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 300 mA, 1.8 V, 250 nA IQ, no output discharge; SOT-23-3 package | Lacks VOUT discharge - unsuitable where fast rail collapse is required for system-level sequencing or safety compliance. | Select when output discharge is unnecessary and lowest possible BOM count is prioritized. |
| Ricoh RP111N181D-TR-F | 300 mA, 1.8 V, 220 nA IQ, 5 nA shutdown (B-grade), no discharge; SOT-23-3 | Lower shutdown current but no DT switch - requires external MOSFET if discharge is needed. | Choose for longest shelf life in storage-critical applications; add discrete discharge circuit if required. |
Compared with MCP1812AT-018/TT, XC6210B182MR-G offers identical output and current but omits discharge functionality, while RP111N181D-TR-F achieves lower shutdown IQ at the cost of added design complexity for discharge - making MCP1812AT-018/TT the optimal balance of integration, ultra-low IQ, and system-level control.
Availability
MCP1812AT-018/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable electronics requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812AT-018/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 global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with a strong focus on low-power and embedded control applications.
The MCP1812AT-018/TT belongs to Microchip's MCP181X ultra-low-IQ LDO family, engineered specifically for battery- and energy-harvesting-powered systems where multi-year operation and precise rail control are critical.
FAQ
What is the maximum input voltage rating for MCP1812AT-018/TT?
The absolute maximum input voltage for MCP1812AT-018/TT is +6.0 V. However, the recommended operating range is 1.8 V to 5.5 V per datasheet specifications. Exceeding 5.5 V may cause permanent damage or accelerated parametric drift, especially under high ambient temperatures.
Does MCP1812AT-018/TT require an input capacitor?
No, MCP1812AT-018/TT is specified to operate stably without an input capacitor - PSRR testing in the datasheet (Figure 2-16 through 2-19) confirms –50 dB rejection at 1 kHz with CIN = 0 µF. An input capacitor may still be used for bulk filtering near noisy sources, but it is not required for stability.
How does the output discharge function work in MCP1812AT-018/TT?
In MCP1812AT-018/TT, the discharge transistor (DT) activates automatically when SHDN is pulled low (GND), creating a low-impedance path from VOUT to GND. This discharges the output capacitor rapidly - typically within microseconds - preventing residual voltage that could interfere with system reset or cause unintended peripheral behavior.
Can MCP1812AT-018/TT be used with a 1 µF output capacitor?
No - MCP1812AT-018/TT requires a minimum of 2.2 µF ceramic (X7R) output capacitance for guaranteed stability, as confirmed in Table 1 and Section 4.2 of DS20006088C. Using 1 µF may result in oscillation or degraded transient response, particularly under 300 mA load steps.
What is the thermal performance of MCP1812AT-018/TT in SOT-23 package?
In the 3-Lead SOT-23 package, MCP1812AT-018/TT has a junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board. At 300 mA and 400 mV dropout, power dissipation is 120 mW, resulting in ~25°C junction rise above ambient - well within the +85°C max operating junction temperature.
MCP1812AT-018/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):
- 1.8V
- 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-018/TT FAQ
1.How can I place an order for MCP1812AT-018/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-018/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-018/TT reliable?
The price and inventory of MCP1812AT-018/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-018/TT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-018/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-018/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-018/TT?
MCP1812AT-018/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-018/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-018/TT?
For technical support, including MCP1812AT-018/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-018/TT requirements.
6.How does Aetrix verify that MCP1812AT-018/TT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-018/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-018/TT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-018/TT?
All MCP1812AT-018/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-018/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-018/TT part is unused and in its original packaging.
Return procedure for MCP1812AT-018/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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