My Inquiry
My Account
Microchip Technology MCP1791T-3302E/DC
- Part No.:
- MCP1791T-3302E/DC
- Manufacturer:
- Microchip Technology
- Package:
- SOT-223-6
- Datasheet:
-
MCP1791T-3302E/DC.pdf
- Description:
- IC REG LINEAR 3.3V 70MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1791T-3302E/DC from Microchip Technology is a 5-pin, fixed-output 3.3V automotive-grade LDO regulator with shutdown control and power-good indication, delivering up to 70 mA at +125°C junction temperature, featuring 48V load dump protection, ±2.5% output tolerance, and 70 µA typical quiescent current - used in microcontroller power supplies for HVAC controls and automotive accessory adapters.
For engineers reviewing the MCP1791T-3302E/DC datasheet, MCP1791T-3302E/DC pinout, MCP1791T-3302E/DC application, or MCP1791T-3302E/DC equivalent, key selection criteria include its 6–30V steady-state input range, 10 µA shutdown current, 30 µs PWRGD rise delay, thermal shutdown at 157°C, and compatibility with 4.7 µF ceramic output capacitors.
Technical Context
The MCP1791T-3302E/DC implements a CMOS-based LDO architecture with integrated VIN monitoring, thermal foldback, and short-circuit current limiting (99 mA typical for 3.3V output). Its internal reference and error amplifier maintain tight line regulation (±0.0002%/V) and load regulation (±0.2% over 1–70 mA).
It integrates active-shutdown logic with 400 ns noise immunity on SHDN and a dedicated open-drain PWRGD output with 90% VOUT threshold and 2% hysteresis. The device meets FORD Test Pulse G Loaded for 48V/500 ms load dump survival and operates across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over –40°C to +125°C - ensures stable MCU core voltage under automotive thermal stress. |
| Max Output Current | 70 mA @ +125°C - supports low-power microcontrollers and sensors without derating in engine bay environments. |
| Input Voltage Range | 6.0V–30.0V continuous, 48V absolute max - compatible with 12V/24V automotive and commercial DC systems. |
| Quiescent Current | 70 µA typical (active), 10 µA typical (shutdown) - enables always-on subsystems meeting ISO 16750-2 quiescent current targets. |
| PSRR | –90 dB @ 100 Hz - suppresses alternator ripple and conducted noise before sensitive analog/mixed-signal circuits. |
| Dropout Voltage | 700 mV typical @ 70 mA - allows operation down to 4.0V input while maintaining 3.3V output during cold-crank events. |
| PWRGD Delay | 30 µs (rising edge), 235 µs (falling edge) - provides deterministic power sequencing for FPGA or MCU reset assertion. |
Pinout & Package
SOT-223-5 surface-mount package with exposed GND tab for thermal dissipation; pin 1 = SHDN (active-low enable), pin 2 = VIN, pin 3 = GND (tab), pin 4 = VOUT, pin 5 = PWRGD (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable input | Pulls low ≤0.8V to disable regulator and PWRGD; includes 400 ns noise immunity and internal pull-down - eliminates need for external pull-down resistor. |
| 2 - VIN | Unregulated input supply | Accepts 6–30V DC; withstands 48V/500 ms load dump transients - enables direct battery connection without external TVS in many automotive designs. |
| 3 - GND | Ground reference & thermal pad | Common return for bias, output, and thermal path; exposed tab must be soldered to PCB copper pour for θJA = 62°C/W performance. |
| 4 - VOUT | Regulated 3.3V output | Stable with 4.7 µF ceramic or 1 µF tantalum; ESR ≤3 Ω required - supports compact, low-BOM-count power stages. |
| 5 - PWRGD | Open-drain power-good flag | Sinks 5 mA when VOUT ≥90% of 3.3V; 2% hysteresis prevents chatter during brown-out recovery - directly interfaces with MCU reset inputs. |
Key Features
| Feature | Design Value |
|---|---|
| 48V Load Dump Protection | Survives 43.5V ±10% transients for <500 ms at 30 s repetition rate per FORD ES-XW7T-1A278-AC - eliminates need for external high-voltage clamping in body control modules. |
| Thermal Shutdown | Triggers at +157°C (typical) with 20°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
| Short-Circuit Foldback | Reduces output current to 99 mA when VOUT falls below 3.0V - limits power dissipation during sustained shorts and enables auto-recovery. |
| Low Ground Current | 110 µA typical @ 70 mA load - reduces system-level I²R losses and eases thermal design in space-constrained enclosures. |
| Startup Overshoot Control | ≤0.10% VOUT overshoot during VIN ramp from 0V to 6V - prevents voltage excursions that could damage downstream logic or EEPROM. |
Applications
| Automotive Accessory Power Adapter | Electronic Thermostat Control |
|---|---|
Use Scenario: 12V vehicle battery powers a USB-C adapter module with isolated data and 5V/3.3V rails. IC Role / Device Role / Timing Role: Primary 3.3V LDO for MCU, CAN transceiver, and display driver; PWRGD synchronizes boot sequence. Use Value: 48V load dump tolerance avoids external TVS diode; 10 µA shutdown current extends parking-mode runtime. |
Use Scenario: Battery-backed HVAC controller operating from 24VAC-derived DC in commercial buildings. IC Role / Device Role / Timing Role: Main 3.3V supply for ARM Cortex-M0+ MCU and wireless SoC; SHDN enables deep sleep during occupancy gaps. Use Value: Stable 3.3V output across –40°C to +125°C ambient enables reliable operation in unconditioned attics or boiler rooms. |
| Microcontroller Power Supply | Low-Voltage Fire Alarm Node |
Use Scenario: Industrial PLC I/O module with isolated 3.3V logic domain powered from 24V field bus. IC Role / Device Role / Timing Role: Local regulation for microcontroller, ADC, and digital isolators; PWRGD drives watchdog enable signal. Use Value: 70 mA output current supports full-speed SPI peripherals; PSRR >75 dB @ 1 kHz rejects switching noise from adjacent DC/DC converters. |
Use Scenario: Addressable smoke detector using 24VDC building supply with ultra-low standby power budget. IC Role / Device Role / Timing Role: Always-on 3.3V rail for CO sensor interface and RF wake-up receiver; SHDN asserts only during alarm transmission. Use Value: 70 µA quiescent current minimizes battery drain in backup mode; 6V minimum VIN enables operation during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP163AMX330TBG | 3.3V fixed, 150 mA output, no PWRGD or SHDN; 1.1V dropout @ 150 mA | Lacks power sequencing features; higher output current but no fault signaling | Choose when higher load current is needed and PWRGD/SHDN are not required for system control. |
| TLE42744G | 3.3V fixed, 400 mA output, integrated watchdog, AEC-Q100 Grade 0, no SHDN pin | Higher current and automotive qualification, but no shutdown control and larger SOIC-8 footprint | Prefer for safety-critical engine bay applications requiring watchdog supervision and higher drive capability. |
Compared with NCP163AMX330TBG and TLE42744G, the MCP1791T-3302E/DC uniquely balances 5-pin functional integration (SHDN + PWRGD), 48V transient resilience, and ultra-low shutdown current - making it optimal for cost-sensitive, space-constrained automotive body electronics where precise power sequencing matters.
Availability
MCP1791T-3302E/DC is available at Aetrix Electronics and suitable for automotive accessory adapters, electronic thermostat controls, microcontroller power supplies, and low-voltage fire alarm nodes requiring stable component supply across extended temperature and transient conditions.
Supply support for MCP1791T-3302E/DC 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 broad automotive and industrial certification coverage.
The MCP1791 series is part of Microchip's high-voltage LDO portfolio designed specifically for harsh-environment power management in automotive, HVAC, and building automation systems - emphasizing transient robustness, low IQ, and integrated diagnostics.
FAQ
What is the maximum input voltage rating for the MCP1791T-3302E/DC?
The MCP1791T-3302E/DC has an absolute maximum input voltage of +48.0V, with continuous operation rated from 6.0V to 30.0V. It is specifically designed to survive 48V (43.5V ±10%) load dump transients for durations under 500 ms per FORD Test Pulse G Loaded - a critical requirement for direct-battery automotive applications.
Does the MCP1791T-3302E/DC require an external capacitor for stability?
Yes, the MCP1791T-3302E/DC requires a minimum output capacitor: 4.7 µF ceramic (X7R/X5R), 1.0 µF tantalum, or 1.0 µF electrolytic. Ceramic capacitors below 4.7 µF require a 0.3 Ω series resistor to ensure stability. Input capacitance of 1–10 µF is recommended for transient suppression and noise filtering.
How does the PWRGD pin function on the MCP1791T-3302E/DC?
The PWRGD pin on the MCP1791T-3302E/DC is an open-drain output that goes low when VOUT falls below 90% of 3.3V (2.97V), with 2% hysteresis. It asserts high after a 30 µs delay when VOUT rises above 2.97V, providing deterministic power sequencing for MCUs or FPGAs - no external pull-up is required beyond standard 10 kΩ to VOUT.
What is the thermal shutdown behavior of the MCP1791T-3302E/DC?
The MCP1791T-3302E/DC activates thermal shutdown at +157°C (typical) junction temperature and recovers when temperature falls to +137°C due to 20°C hysteresis. During shutdown, output is disabled and quiescent current drops to 10 µA - preventing thermal runaway while allowing automatic recovery once cooling occurs.
Can the MCP1791T-3302E/DC be used in place of the MCP1790 series?
No - the MCP1791T-3302E/DC is a 5-pin variant with SHDN and PWRGD pins, whereas the MCP1790 is a 3-pin device without those functions. Pin compatibility does not exist; replacing MCP1790 with MCP1791T-3302E/DC requires PCB layout changes to accommodate the two additional signals and associated routing.
MCP1791T-3302E/DC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-223-6
- Packaging:
- Tape & Reel (TR)
- 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:
- Enable, Power Good
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-5
MCP1791T-3302E/DC FAQ
1.How can I place an order for MCP1791T-3302E/DC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1791T-3302E/DC 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 MCP1791T-3302E/DC reliable?
The price and inventory of MCP1791T-3302E/DC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1791T-3302E/DC is usually 5 days.
3.What payment methods are accepted for MCP1791T-3302E/DC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1791T-3302E/DC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1791T-3302E/DC?
MCP1791T-3302E/DC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1791T-3302E/DC 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 MCP1791T-3302E/DC?
For technical support, including MCP1791T-3302E/DC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1791T-3302E/DC requirements.
6.How does Aetrix verify that MCP1791T-3302E/DC is sourced from the original manufacturer or authorized distributors?
All MCP1791T-3302E/DC 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 MCP1791T-3302E/DC meets industry standards.
7.What is the process for return or replacement of MCP1791T-3302E/DC?
All MCP1791T-3302E/DC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1791T-3302E/DC, 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 MCP1791T-3302E/DC part is unused and in its original packaging.
Return procedure for MCP1791T-3302E/DC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1791T-3302E/DC Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
