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Microchip Technology MCP1702T-4702E/CB
- Part No.:
- MCP1702T-4702E/CB
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1702T-4702E/CB.pdf
- Description:
- IC REG LIN 4.7V 250MA SOT23A-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
MCP1702T-4702E/CB from Microchip Technology is a CMOS low-dropout (LDO) voltage regulator delivering 250 mA output current at 4.7 V with 2.0 µA quiescent current, 625 mV typical dropout (at 250 mA, VOUT = 2.8 V), ±0.4% output voltage tolerance, and stable operation with 1.0–22 µF ceramic output capacitors. It powers microcontroller subsystems in battery-operated smoke detectors and CO₂ sensors where ultra-low standby power is critical.
For engineers reviewing the MCP1702T-4702E/CB datasheet, MCP1702T-4702E/CB pinout, MCP1702T-4702E/CB application, or MCP1702T-4702E/CB equivalent, key selection criteria include guaranteed 4.7 V output accuracy over –40°C to +125°C, SOT-23A package thermal resistance (θJA = 336°C/W), short-circuit and overtemperature protection, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The MCP1702T-4702E/CB uses a P-channel MOSFET pass element controlled by an internal error amplifier referenced to a precision bandgap, enabling regulation with minimal input-to-output differential. Its architecture supports stable operation across 2.7–13.2 V input while maintaining ±0.4% initial output accuracy and 50 ppm/°C temperature coefficient.
Protection circuitry includes foldback current limiting (typical 400 mA short-circuit current) and thermal shutdown at 150°C with automatic recovery at ~130°C. The device achieves 44 dB PSRR at 100 Hz and 8 µV/√Hz output noise at 1 kHz under 50 mA load, making it suitable for noise-sensitive analog and mixed-signal loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.7 V nominal, ±0.4% typical tolerance at +25°C ensures precise biasing of 3.3 V/5 V logic interfaces without post-regulation trimming |
| Quiescent Current | 2.0 µA typical enables >10-year battery life in always-on smoke detectors using two AA alkaline cells |
| Max Output Current | 250 mA continuous for VOUT ≥ 2.5 V supports full-power MCU operation and peripheral drivers in compact sensor nodes |
| Dropout Voltage | 625 mV typical at 250 mA (VOUT = 2.8 V); for 4.7 V output, dropout remains ≤725 mV - allows operation down to 5.42 V input |
| Operating Input Range | 2.7 V to 13.2 V accommodates 2–6 alkaline cells, single/dual Li-ion, or 9 V batteries without external pre-regulation |
| Thermal Shutdown | 150°C junction limit with hysteresis prevents permanent damage during sustained overload or poor PCB heatsinking |
| Capacitor Stability | Stable with 1.0–22 µF ceramic output capacitors eliminates need for tantalum or electrolytic types, reducing BOM cost and size |
Pinout & Package
Package: SOT-23A (3-pin, surface-mount, JEDEC MO-178AA compliant). Thermal resistance θJA = 336°C/W on standard 4-layer FR-4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference terminal | Low-current return path (2.0 µA bias only); must be tied directly to negative side of input/output capacitors and load to minimize regulation error |
| 2 (VIN) | Unregulated input supply | Connects to source of P-MOS pass transistor; requires ≤10 Ω source impedance; 1 µF ceramic capacitor recommended for stability |
| 3 (VOUT) | Regulated output voltage | Delivers up to 250 mA at 4.7 V; output capacitor positive terminal must be placed adjacent to this pin to suppress high-frequency noise |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 2.0 µA typical enables multi-year operation from coin-cell or alkaline batteries in maintenance-free IoT endpoints |
| High output accuracy | ±0.4% typical tolerance at +25°C reduces need for system-level calibration in precision sensor signal chains |
| Wide input voltage range | 2.7–13.2 V supports direct connection to common battery chemistries (alkaline, Li-ion, NiMH) without intermediate buck stages |
| Robust protection suite | Integrated short-circuit foldback and thermal shutdown prevent field failures in unattended deployments like fire alarm systems |
| Ceramic capacitor compatibility | Stable with 1–22 µF X7R ceramics eliminates ESR constraints and simplifies layout in space-constrained modules |
Applications
| Smoke Detector Power Supply | CO₂ Sensor Biasing |
|---|---|
|
Use Scenario: Standby and alarm-mode power management in residential smoke detectors powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Primary 4.7 V LDO supplying MCU, optical chamber LED driver, and buzzer amplifier. Use Value: 2.0 µA quiescent current extends battery life beyond 10 years in standby; 250 mA peak supports simultaneous LED flash and audible alarm. |
Use Scenario: Precision analog front-end biasing in portable NDIR-based CO₂ monitors using dual 3.7 V Li-ion cells. IC Role / Device Role / Timing Role: Stable 4.7 V reference for IR detector photodiode transimpedance amplifier and ADC reference buffer. Use Value: ±0.4% output tolerance and 50 ppm/°C drift ensure <0.5% measurement error across –10°C to +50°C ambient range. |
| Smart Battery Pack Monitor | Microcontroller Core Supply |
|
Use Scenario: Auxiliary power rail for fuel-gauge IC and protection circuitry inside rechargeable battery packs. IC Role / Device Role / Timing Role: Regulated 4.7 V supply for SMBus/I²C interface, cell voltage monitoring ADC, and EEPROM. Use Value: Dropout ≤725 mV allows operation down to 5.42 V pack voltage - covers full discharge curve of 2S Li-ion (8.4 V → 6.0 V). |
Use Scenario: Core voltage rail for low-power 32-bit MCUs (e.g., PIC32MK, SAM L22) in industrial data loggers. IC Role / Device Role / Timing Role: Primary 4.7 V supply feeding internal DC-DC converter or directly powering MCU I/O banks. Use Value: 44 dB PSRR at 100 Hz suppresses ripple from switching converters; 8 µV/√Hz noise avoids ADC quantization floor degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-4702E/MB | SOT-89-3 package (θJA = 153.3°C/W), higher thermal performance but larger footprint; identical electrical specs | Better suited for 300+ mA average loads or higher ambient temperatures (>60°C) where SOT-23A self-heating exceeds limits | Select when thermal margin is constrained and PCB area permits larger package; not pin-compatible with SOT-23A |
| TN8204-4702E | 4.7 V fixed output, 250 mA, 2.5 µA IQ, SOT-23A - slightly higher quiescent current and ±1.0% tolerance vs. MCP1702's ±0.4% | Acceptable for cost-sensitive consumer devices where 10-year battery life is less critical than $0.03 BOM reduction | Choose for price-driven designs accepting wider output tolerance and reduced long-term reliability margin |
Compared with MCP1702T-4702E/CB, the MCP1703T-4702E/MB offers superior thermal handling in thermally dense layouts but requires PCB redesign, while the TN8204-4702E trades precision and ultra-low IQ for lower unit cost - making the MCP1702T-4702E/CB optimal for safety-critical, long-life, and noise-sensitive applications.
Availability
MCP1702T-4702E/CB is available at Aetrix Electronics and suitable for smoke detector manufacturing, CO₂ sensor module assembly, and smart battery pack integration requiring stable component supply and full traceability.
Supply support for MCP1702T-4702E/CB 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer markets.
The MCP1702 product line delivers micropower LDO regulators optimized for battery-powered instrumentation, safety systems, and portable electronics where ultra-low IQ and high accuracy are mandatory.
FAQ
What is the guaranteed output voltage tolerance for MCP1702T-4702E/CB across temperature?
The MCP1702T-4702E/CB has a typical output voltage tolerance of ±0.4% at +25°C and a maximum of ±3% over the full operating junction temperature range of –40°C to +125°C. This is verified per DS22008E Electrical Characteristics table, ensuring reliable operation in automotive cabin or industrial enclosure environments without recalibration.
Can MCP1702T-4702E/CB operate from a single 3.7 V Li-ion cell?
No - the MCP1702T-4702E/CB requires minimum 2.7 V input but must maintain VIN ≥ VOUT + VDROPOUT. With 4.7 V output and typical 725 mV dropout at 250 mA, minimum input is 5.425 V. It is designed for two-cell Li-ion (7.4 V nominal), 9 V alkaline, or 4–6 AA/AAA configurations - not single-cell Li-ion.
Does MCP1702T-4702E/CB require an input capacitor?
Yes - a minimum 1 µF ceramic capacitor is recommended between VIN and GND for stability, especially with high-impedance sources like batteries. The datasheet specifies low source impedance (<10 Ω) is required; omitting CIN risks oscillation or poor transient response during load steps.
What protection features are integrated into MCP1702T-4702E/CB?
The MCP1702T-4702E/CB integrates short-circuit foldback current limiting (typical 400 mA) and thermal shutdown at 150°C with automatic recovery at ~130°C. These functions are fully internal - no external components needed - and protect against sustained overload, PCB shorts, or inadequate heatsinking in sealed enclosures.
Is MCP1702T-4702E/CB compatible with 22 µF ceramic output capacitors?
Yes - the MCP1702T-4702E/CB is explicitly characterized for stability with 1.0–22 µF ceramic (X7R) output capacitors per DS22008E Section 5.2. Larger values may shift pole location and require validation via load-step testing, but 22 µF is within the qualified range and improves transient response for pulsed MCU loads.
MCP1702T-4702E/CB 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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13.2V
- Voltage - Output (Min/Fixed):
- 4.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.725V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 5 µA
- Current - Supply (Max):
- -
- PSRR:
- 44dB (100Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23A-3
MCP1702T-4702E/CB FAQ
1.How can I place an order for MCP1702T-4702E/CB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1702T-4702E/CB 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 MCP1702T-4702E/CB reliable?
The price and inventory of MCP1702T-4702E/CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1702T-4702E/CB is usually 5 days.
3.What payment methods are accepted for MCP1702T-4702E/CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1702T-4702E/CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1702T-4702E/CB?
MCP1702T-4702E/CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1702T-4702E/CB 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 MCP1702T-4702E/CB?
For technical support, including MCP1702T-4702E/CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1702T-4702E/CB requirements.
6.How does Aetrix verify that MCP1702T-4702E/CB is sourced from the original manufacturer or authorized distributors?
All MCP1702T-4702E/CB 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 MCP1702T-4702E/CB meets industry standards.
7.What is the process for return or replacement of MCP1702T-4702E/CB?
All MCP1702T-4702E/CB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1702T-4702E/CB, 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 MCP1702T-4702E/CB part is unused and in its original packaging.
Return procedure for MCP1702T-4702E/CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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