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Microchip Technology MCP1703AT-4002E/MB
- Part No.:
- MCP1703AT-4002E/MB
- Manufacturer:
- Microchip Technology
- Package:
- TO-243AA
- Datasheet:
-
MCP1703AT-4002E/MB.pdf
- Description:
- IC REG LINEAR 4V 250MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
MCP1703AT-4002E/MB from Microchip Technology is a 4.0 V fixed-output, 250 mA low-dropout (LDO) linear voltage regulator in SOT-23A package, featuring 2.0 µA typical quiescent current, 625 mV typical dropout at 250 mA (VOUT = 2.8 V), ±0.4% output voltage tolerance at +25°C, and stable operation with 1.0 µF ceramic output capacitance - deployed in microcontroller power rails for battery-powered smoke detectors.
For engineers reviewing the MCP1703AT-4002E/MB datasheet, MCP1703AT-4002E/MB pinout, MCP1703AT-4002E/MB application, or MCP1703AT-4002E/MB equivalent, key selection criteria include ultra-low IQ, guaranteed 200 mA output at 4.0 V, thermal shutdown at 150°C, input range up to 16.0 V, and compatibility with single/dual Li-ion or multi-cell alkaline sources.
Technical Context
The MCP1703AT-4002E/MB uses a P-channel PMOS pass transistor architecture enabling low dropout and minimal ground current during regulation. Its internal error amplifier compares a precision bandgap reference against a resistive feedback network (internal for fixed-output variants) to maintain output stability across load and line variations.
It integrates overcurrent limiting that cycles into hiccup mode under short-circuit conditions and thermal shutdown that disables the pass device above 150°C junction temperature, re-enabling at ~130°C. The device operates across –40°C to +125°C junction temperature with ±3% total output voltage variation over full temperature and load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±0.4% (typical at +25°C); ensures accurate biasing for 3.3 V–5.0 V logic interfaces without external feedback. |
| Max Output Current | 250 mA @ VOUT ≥ 2.5 V; supports moderate-power MCU cores, sensors, and RF transceivers in compact portable designs. |
| Quiescent Current | 2.0 µA typical; extends battery life in always-on alarm circuits where standby current dominates lifetime energy budget. |
| Dropout Voltage | 625 mV typical @ 250 mA (VOUT = 2.8 V); enables regulation down to 4.625 V input for 4.0 V output - critical for end-of-life alkaline or Li-ion discharge curves. |
| Input Voltage Range | 2.7 V to 16.0 V; accommodates 2–6 alkaline cells, 9 V batteries, or 1–2 Li-ion cells without external pre-regulation. |
| Thermal Shutdown | 150°C trip point; protects against sustained overload or poor PCB thermal design while allowing recovery at ~130°C. |
| Stability | Stable with 1.0 µF to 22 µF ceramic output capacitor; eliminates need for high-ESR tantalum or electrolytic caps, reducing BOM cost and board space. |
Pinout & Package
SOT-23A 3-pin surface-mount package with exposed thermal pad (EP) internally connected to GND; footprint compatible with JEDEC MO-178AA, optimized for low thermal resistance (θJA = 336°C/W on 4-layer FR-4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 3) | Unregulated Input Supply | Connects to source of P-MOS pass transistor; requires ≥1 µF ceramic bypass near pin to ensure stability under dynamic loads. |
| GND (Pin 1) | Regulator Ground Reference | Low-current return path for internal bias (2.0 µA); must be tied directly to negative side of CIN/COUT and load to avoid regulation error. |
| VOUT (Pin 2) | Regulated Output | Delivers 4.0 V to load; output current equals load current; place COUT positive terminal adjacent to this pin for optimal transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 2.0 µA typical enables >10-year battery life in CO2 detectors operating from two AA cells. |
| Low dropout with P-MOS pass element | 625 mV @ 250 mA preserves usable input voltage headroom down to 4.625 V for 4.0 V output. |
| ±0.4% initial output tolerance | Reduces need for post-regulation trimming in precision analog sensor signal chains powered by MCP1703AT-4002E/MB. |
| Internal thermal and short-circuit protection | Hiccup-mode current limiting and 150°C shutdown prevent damage during fault conditions without external components. |
| 1 µF ceramic capacitor stability | Eliminates ESR dependency, simplifies layout, and improves PSRR/noise performance vs. traditional LDOs requiring ≥10 µF tantalum. |
Applications
| Smoke Detector Power | Smart Battery Pack Monitor |
|---|---|
|
Use Scenario: Standby and alarm-cycle power for photoelectric/ionization smoke alarms using two AA alkaline cells. IC Role / Device Role / Timing Role: Primary 4.0 V supply for MCU, sensor interface, and audible alarm driver. Use Value: 2.0 µA IQ extends shelf life beyond 10 years; 625 mV dropout sustains regulation until cell voltage drops to 4.625 V. |
Use Scenario: Voltage regulation for fuel-gauge IC and protection circuitry inside 2S Li-ion battery packs. IC Role / Device Role / Timing Role: Stable 4.0 V rail for coulomb counter and ADC reference in battery management subsystem. Use Value: ±0.4% output tolerance ensures <1% error in voltage-based state-of-charge estimation; 16 V max input handles pack open-circuit voltage. |
| Portable Medical Sensor Node | Industrial Wireless Transmitter |
|
Use Scenario: Powering low-power pulse oximeter or glucose meter modules operating from coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Clean, low-noise 4.0 V supply for analog front-end and BLE SoC during measurement bursts. Use Value: 1 µV/√Hz output noise and 35 dB PSRR at 100 Hz minimize interference in sensitive biomedical signal acquisition. |
Use Scenario: Regulating power for sub-GHz RF transceivers and microcontrollers in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Main 4.0 V supply for radio, MCU, and sensor interface in IP67-rated industrial enclosures. Use Value: –40°C to +125°C operating range supports deployment in unheated outdoor cabinets; thermal shutdown prevents field failures under sustained RF transmit load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-4002E/MB | Same electrical specs and SOT-23A package; differs only in tape-and-reel packaging (no tray option). | Identical functional use; selected when automated SMT placement requires reel format. | Direct form-fit-function replacement; no design change required. |
| NCP170AMX400TCG | 4.0 V fixed output, 250 mA, 1.6 µA IQ, but rated only to +85°C ambient (vs. +125°C junction for MCP1703AT-4002E/MB). | Limited to consumer-grade indoor applications; unsuitable for automotive or industrial environments requiring extended temperature operation. | Consider only if ambient temperature stays ≤85°C and ultra-low 1.6 µA IQ is prioritized over thermal robustness. |
Compared with MCP1703T-4002E/MB, the MCP1703AT-4002E/MB offers identical performance in tray packaging for manual or semi-automated assembly; versus NCP170AMX400TCG, it provides guaranteed operation to +125°C junction temperature and superior thermal protection - essential for harsh-environment deployments.
Availability
MCP1703AT-4002E/MB is available at Aetrix Electronics and suitable for battery-powered alarm circuits, smoke detectors, and smart battery packs requiring stable component supply with long-lifecycle support and traceable sourcing.
Supply support for MCP1703AT-4002E/MB 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 devices, and connectivity solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1703A family was designed specifically for ultra-low-power, wide-input-voltage LDO applications in safety-critical and long-life battery systems - emphasizing quiescent current minimization, thermal resilience, and output accuracy without external components.
FAQ
What is the maximum input voltage rating for the MCP1703AT-4002E/MB?
The MCP1703AT-4002E/MB has an absolute maximum input voltage rating of +18 V, with recommended continuous operation from 2.7 V to 16.0 V. Exceeding 16.0 V may trigger internal protection or degrade reliability; operation at 16.0 V is validated for full temperature range with appropriate thermal design.
Does the MCP1703AT-4002E/MB require an external output capacitor, and what type is recommended?
Yes, the MCP1703AT-4002E/MB requires a minimum 1.0 µF ceramic output capacitor for stability. X7R or X5R dielectrics are recommended; the device remains stable with values up to 22 µF. Tantalum or aluminum electrolytic capacitors are acceptable but offer no performance advantage over ceramic in this design.
How does the thermal shutdown behavior of the MCP1703AT-4002E/MB function during overload?
The MCP1703AT-4002E/MB shuts down when junction temperature reaches ~150°C and resumes operation once temperature falls to ~130°C. This thermal cycling (hiccup mode) prevents permanent damage during sustained overload or inadequate heatsinking, and is fully internal - no external components needed.
Can the MCP1703AT-4002E/MB deliver its full 250 mA output current at 4.0 V output?
Yes - the MCP1703AT-4002E/MB delivers up to 250 mA continuously at 4.0 V output, as VOUT = 4.0 V satisfies the "≥2.5 V" condition specified for full-rated current. Derating applies only for outputs below 2.5 V, which does not affect the MCP1703AT-4002E/MB.
What is the significance of the 'T' suffix in MCP1703AT-4002E/MB compared to MCP1703A-4002E/MB?
The 'T' in MCP1703AT-4002E/MB denotes tape-and-reel packaging per EIA-481 standard, whereas non-T versions are supplied in trays. Electrical, thermal, and functional specifications are identical between MCP1703AT-4002E/MB and MCP1703A-4002E/MB - only packaging differs.
MCP1703AT-4002E/MB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.725V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 5 µA
- Current - Supply (Max):
- -
- PSRR:
- 35dB (100Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
MCP1703AT-4002E/MB FAQ
1.How can I place an order for MCP1703AT-4002E/MB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1703AT-4002E/MB 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 MCP1703AT-4002E/MB reliable?
The price and inventory of MCP1703AT-4002E/MB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1703AT-4002E/MB is usually 5 days.
3.What payment methods are accepted for MCP1703AT-4002E/MB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1703AT-4002E/MB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1703AT-4002E/MB?
MCP1703AT-4002E/MB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1703AT-4002E/MB 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 MCP1703AT-4002E/MB?
For technical support, including MCP1703AT-4002E/MB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1703AT-4002E/MB requirements.
6.How does Aetrix verify that MCP1703AT-4002E/MB is sourced from the original manufacturer or authorized distributors?
All MCP1703AT-4002E/MB 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 MCP1703AT-4002E/MB meets industry standards.
7.What is the process for return or replacement of MCP1703AT-4002E/MB?
All MCP1703AT-4002E/MB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1703AT-4002E/MB, 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 MCP1703AT-4002E/MB part is unused and in its original packaging.
Return procedure for MCP1703AT-4002E/MB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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