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Microchip Technology MCP1790-3302E/DB
- Part No.:
- MCP1790-3302E/DB
- Manufacturer:
- Microchip Technology
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MCP1790-3302E/DB.pdf
- Description:
- IC REG LINEAR 3.3V 70MA SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,034
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Product details
Overview
MCP1790-3302E/DB from Microchip Technology is a 3-pin, fixed-output 3.3V low-quiescent-current linear regulator designed for automotive and industrial 12/24VDC systems. It delivers up to 70 mA at +125°C junction temperature, withstands 48V load dump transients (<500 ms), operates from 6.0V–30.0V input, and maintains ±2.5% output voltage tolerance over –40°C to +125°C.
For engineers reviewing the MCP1790-3302E/DB datasheet, MCP1790-3302E/DB pinout, MCP1790-3302E/DB application, or MCP1790-3302E/DB equivalent, this page provides verified electrical specs, thermal performance data, SOT-223-3 package mapping, automotive-grade transient protection details, and real-world design constraints for fire alarm, thermostat, and microcontroller power supply use cases.
Technical Context
The MCP1790-3302E/DB is a CMOS-based high-voltage LDO with integrated thermal shutdown (157°C typical) and short-circuit current limiting (99 mA typical at 3.3V). Its architecture includes internal VIN monitoring for undervoltage lockout (turn-on threshold 5.5V) and dropout voltage of 700 mV typical at 70 mA load.
Unlike the 5-pin MCP1791, this variant omits SHDN and PWRGD pins-VIN is internally bonded to the shutdown logic, making it permanently enabled. It achieves –90 dB PSRR at 100 Hz and remains stable with 4.7 µF ceramic or 1 µF tantalum output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over –40°C to +125°C - ensures reliable MCU core/logic rail regulation in automotive cabins and HVAC enclosures. |
| Max Output Current | 70 mA at +125°C junction - supports multiple low-power sensors or an ARM Cortex-M0+ MCU with peripherals active. |
| Input Voltage Range | 6.0V–30.0V continuous, 48V absolute max - compatible with 12V/24V battery systems and survives FORD Pulse G load dump events. |
| Quiescent Current | 70 µA typical at no load - enables >10-year battery-backed operation in smoke detectors powered from 24VDC fire alarm loops. |
| Dropout Voltage | 700 mV typical at 70 mA - allows regulation down to VIN = 4.0V, critical for brownout resilience during cold-cranking in vehicles. |
| PSRR | –90 dB @ 100 Hz - suppresses alternator ripple and switching noise from adjacent DC/DC converters feeding shared 24V rails. |
| Thermal Shutdown | 157°C typical activation - protects against sustained overload in sealed enclosures without forced airflow. |
Pinout & Package
SOT-223-3 package with exposed thermal pad (GND-connected); footprint matches JEDEC MO-178AB standard. Pin 1 = VIN, Pin 2/Tab = GND, Pin 3 = VOUT. No SHDN or PWRGD pins - permanently enabled operation only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated Input Supply | Accepts 6–30V DC; must be decoupled with ≥1 µF capacitor near pin to suppress transients and ensure stability. |
| 2 & Tab (GND) | Ground Reference / Thermal Path | Low-impedance return for bias current only; exposed tab must be soldered to PCB copper pour for thermal dissipation (θJA = 62°C/W). |
| 3 (VOUT) | Regulated 3.3V Output | Supplies downstream logic; requires ≥4.7 µF ceramic or ≥1 µF tantalum output capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Load Dump Protection | Withstands 48V (±10%) transients <500 ms duration per FORD Test Pulse G - eliminates need for external TVS in cost-sensitive automotive accessory designs. |
| Ultra-Low Ground Current | 110 µA typical at 70 mA load - reduces I²R losses in long-wire 24V fire alarm loops, enabling smaller gauge wiring and lower system energy cost. |
| Ceramic Capacitor Stability | Stable with 4.7 µF–1000 µF X7R/X5R ceramics - avoids tantalum supply chain risk and improves reliability vs. electrolytic alternatives. |
| Line Regulation | ±0.0002%/V typical - maintains tight output accuracy across wide input range (e.g., 12V battery sag to 28V alternator surge). |
| Short-Circuit Foldback | 99 mA foldback current at 3.0V output corner - limits power dissipation during fault, preventing thermal runaway in unattended systems. |
Applications
| Fire Alarm Sensor Node | Automotive Cabin Controller |
|---|---|
Use Scenario: 24VDC-powered CO₂ sensor module mounted in commercial building ceiling ducts, operating continuously for 10+ years. IC Role / Device Role / Timing Role: Primary 3.3V power source for ultra-low-power MCU, analog front-end, and digital I²C interface. Use Value: 70 µA quiescent current extends battery backup life; ±2.5% output tolerance ensures ADC reference stability across –40°C to +70°C ambient. |
Use Scenario: HVAC control unit in vehicle cabin, powered from 12V battery with exposure to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Local 3.3V rail for microcontroller, CAN transceiver, and display driver ICs. Use Value: 48V transient immunity eliminates external clamping diodes; 70 mA output supports full-system wake-up without brownout. |
| Industrial Thermostat | Microcontroller Power Rail |
Use Scenario: Wired electronic thermostat using 24VAC-to-DC conversion, installed in unconditioned attics with seasonal –30°C to +85°C extremes. IC Role / Device Role / Timing Role: Regulated 3.3V supply for precision temperature sensing, wireless BLE SoC, and EEPROM. Use Value: –40°C to +125°C junction rating ensures operation at full spec; 62°C/W θJA enables convection-only cooling in sealed plastic housing. |
Use Scenario: Standalone MCU board (e.g., PIC16F15313) in industrial PLC I/O module, powered from shared 24V backplane. IC Role / Device Role / Timing Role: Dedicated low-noise 3.3V domain for digital logic and clock generation. Use Value: –90 dB PSRR at 100 Hz rejects 120 Hz rectified ripple from upstream AC/DC converter; dropout <700 mV sustains operation during 24V rail dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP163AMX330TBG | 300 mA output, 250 µA IQ, 1.8V–5.5V input - higher current but wider input range and no load dump rating. | Not qualified for automotive transient standards; suitable for industrial 5V systems but not 12/24V automotive or fire alarm. | Select when >70 mA load or sub-6V start-up is required; verify external TVS needed for load dump. |
| TPS7B6733QPWPRQ1 | 250 mA output, 15 µA IQ, AEC-Q100 Grade 1, 45V load dump - pin-compatible SOT-223 but higher cost and IQ spec. | Designed for automotive ECU power domains requiring AEC-Q100 qualification and tighter IQ budget. | Choose for new automotive designs requiring formal qualification; MCP1790-3302E/DB remains optimal for cost-sensitive non-AEC applications. |
Compared with NCP163AMX330TBG and TPS7B6733QPWPRQ1, the MCP1790-3302E/DB offers the best balance of load dump immunity, ultra-low IQ, and cost for non-AEC fire safety and HVAC control systems - while delivering identical 3.3V/70 mA performance in SOT-223-3 footprint.
Availability
MCP1790-3302E/DB is available at Aetrix Electronics and suitable for automotive accessory power adapters, electronic thermostat controls, and microcontroller power supply applications requiring stable component supply across extended temperature and transient stress conditions.
Supply support for MCP1790-3302E/DB 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions for industrial, automotive, and consumer markets.
The MCP1790 series was engineered specifically for high-reliability 12/24VDC power conversion in harsh environments - targeting fire alarm systems, automotive body electronics, and commercial HVAC where load dump survival and low ground current are mandatory.
FAQ
What is the maximum input voltage the MCP1790-3302E/DB can withstand without damage?
The MCP1790-3302E/DB has an absolute maximum input voltage rating of +48.0V, and is specifically designed to survive 48V (43.5V ±10%) load dump transients lasting under 500 ms with a 30-second repetition rate per FORD Test Pulse G Loaded. Continuous operation must remain within 6.0V–30.0V.
Does the MCP1790-3302E/DB include a shutdown pin?
No - the MCP1790-3302E/DB is the 3-pin variant (SOT-223-3 or DDPAK-3) and does not feature a SHDN pin. The shutdown function is internally disabled; VIN is bonded directly to enable logic, resulting in always-on operation. For shutdown capability, use the 5-pin MCP1791 variant instead.
What output capacitor types and values are supported by the MCP1790-3302E/DB?
The MCP1790-3302E/DB is stable with 4.7 µF–1000 µF X7R/X5R ceramic capacitors, or 1 µF–1000 µF tantalum/electrolytic capacitors. Ceramic capacitors below 4.7 µF require a 0.3 Ω series resistor to ensure stability. ESR must not exceed 3 Ω, and placement must be within 5 mm of VOUT and GND pins.
What is the thermal performance of the MCP1790-3302E/DB in SOT-223-3 package?
In the SOT-223-3 package on a 4-layer PCB, the MCP1790-3302E/DB has a junction-to-ambient thermal resistance (θJA) of 62°C/W and junction-to-case (θJC) of 15°C/W. With its 157°C thermal shutdown threshold and 70 mA max load, proper copper pour under the exposed tab is essential to maintain ≤+125°C junction temperature in enclosed environments.
Is the MCP1790-3302E/DB suitable for automotive applications requiring AEC-Q100 qualification?
The MCP1790-3302E/DB is not AEC-Q100 qualified. While it meets key automotive stress requirements - including 48V load dump survival, –40°C to +125°C operation, and thermal/short-circuit protection - it lacks formal AEC-Q100 Grade 2 or Grade 1 certification. For AEC-compliant designs, consider the pin-compatible TPS7B6733QPWPRQ1.
MCP1790-3302E/DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 70mA
- Current - Output:
- 70mA
- Current - Quiescent (Iq):
- 130 µA
- Current - Supply (Max):
- 210 µA
- PSRR:
- 90dB ~ 80dB (100Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
MCP1790-3302E/DB FAQ
1.How can I place an order for MCP1790-3302E/DB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1790-3302E/DB 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 MCP1790-3302E/DB reliable?
The price and inventory of MCP1790-3302E/DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1790-3302E/DB is usually 5 days.
3.What payment methods are accepted for MCP1790-3302E/DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1790-3302E/DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1790-3302E/DB?
MCP1790-3302E/DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1790-3302E/DB 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 MCP1790-3302E/DB?
For technical support, including MCP1790-3302E/DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1790-3302E/DB requirements.
6.How does Aetrix verify that MCP1790-3302E/DB is sourced from the original manufacturer or authorized distributors?
All MCP1790-3302E/DB 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 MCP1790-3302E/DB meets industry standards.
7.What is the process for return or replacement of MCP1790-3302E/DB?
All MCP1790-3302E/DB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1790-3302E/DB, 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 MCP1790-3302E/DB part is unused and in its original packaging.
Return procedure for MCP1790-3302E/DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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