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Microchip Technology MCP1791T-3002E/DC
- Part No.:
- MCP1791T-3002E/DC
- Manufacturer:
- Microchip Technology
- Package:
- SOT-223-6
- Datasheet:
-
MCP1791T-3002E/DC.pdf
- Description:
- IC REG LINEAR 3V 70MA SOT223-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1791T-3002E/DC from Microchip Technology is a 5-pin, fixed-output 3.0V low-dropout linear regulator designed for automotive and industrial 12/24V DC systems. It delivers up to 70 mA at +125°C junction temperature, features 48V load dump protection (<500 ms), ±2.5% output voltage tolerance over -40°C to +125°C, and integrates shutdown control (SHDN) and power-good (PWRGD) signaling - enabling robust microcontroller power management in fire alarm sensors and HVAC controls.
For engineers reviewing the MCP1791T-3002E/DC datasheet, MCP1791T-3002E/DC pinout, MCP1791T-3002E/DC application, or MCP1791T-3002E/DC equivalent, this page provides verified functional identity, validated SOT-223-5 pin mapping, confirmed 3.0V/70mA/48V-tolerant operation, thermal shutdown at 157°C, and real-world alternatives with documented differences in output voltage and shutdown behavior.
Technical Context
The MCP1791T-3002E/DC implements a CMOS-based LDO architecture with internal reference, error amplifier, and foldback short-circuit protection. Its 3.0V output is stabilized by a 65 ppm/°C temperature coefficient and ±0.2% typical load regulation across 1–70 mA.
It incorporates dual protection logic: VIN monitoring for undervoltage lockout (turn-on at 5.5V, turn-off below ~4.0V) and thermal shutdown with 20°C hysteresis (trip at 157°C, recover at 137°C). The SHDN input enables active-low control with 400 ns noise immunity and 100 µs turn-on delay; PWRGD provides open-drain status with 90% VOUT threshold and 30 µs rise-time delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2.5% over -40°C to +125°C - ensures stable MCU core voltage under automotive thermal cycling. |
| Max Output Current | 70 mA at +125°C junction - supports full-load operation in high-temp engine bay or industrial enclosures. |
| Input Voltage Range | 6.0V to 30.0V continuous; 48V absolute max (43.5V ±10%, <500 ms) - survives FORD Pulse G load dumps without external TVS. |
| Quiescent Current | 70 µA typical (active), 10 µA typical (shutdown) - meets automotive quiescent current requirements for always-on modules. |
| Dropout Voltage | 700 mV typical at 70 mA - allows regulation down to VIN = 3.7V, critical for battery brownout resilience. |
| PSRR | -90 dB @ 100 Hz - suppresses alternator ripple and switching noise in shared power rails. |
| Thermal Shutdown | 157°C typical trip, 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
SOT-223-5 package with exposed GND tab for thermal dissipation; θJA = 62°C/W on 4-layer board. Pin 1 (SHDN) and Pin 5 (PWRGD) enable system-level power sequencing and fault reporting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Active-low enable input | Pulls low to disable regulator and force PWRGD low; includes 400 ns noise filter and 100 µs turn-on delay. |
| 2: VIN | Unregulated input supply | Accepts 6–30V DC; withstands 48V transients; requires ≥1 µF input capacitance for stability. |
| 3: GND | Ground reference terminal | Common return for bias, output, and exposed tab; must be low-impedance to minimize regulation error. |
| 4: VOUT | Regulated 3.0V output | Stable with 4.7 µF ceramic or 1 µF tantalum; ESR ≤ 3 Ω required for loop stability. |
| 5: PWRGD | Open-drain power-good indicator | Sinks 5 mA when VOUT ≥ 90% of 3.0V; 30 µs delay on rise, 235 µs on fall - enables safe processor boot sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 48V Load Dump Protection | Withstands 43.5V ±10% transients for <500 ms at 30 s repetition - eliminates need for external TVS in automotive accessory adapters. |
| Low Ground Current | 110 µA typical at 70 mA load - reduces wiring losses and energy cost in distributed fire alarm networks with hundreds of nodes. |
| Short-Circuit Foldback | 99 mA foldback current at 3.0V output - limits power dissipation during sustained shorts, preventing thermal runaway. |
| High PSRR at Low Frequency | -90 dB @ 100 Hz - maintains clean 3.0V rail despite 400 mVpp alternator ripple without input filtering. |
| Stable with Ceramic Capacitors | Works with 4.7 µF to 1000 µF X7R/X5R ceramics - enables compact, low-ESR, high-reliability output filtering. |
Applications
| Automotive Accessory Power Adapter | Electronic Thermostat Control |
|---|---|
|
Use Scenario: Powers microcontroller, display, and sensor interface in 12V vehicle-mounted climate controllers. IC Role / Device Role / Timing Role: Primary 3.0V LDO supplying MCU core and I²C peripherals; PWRGD signals boot readiness to host processor. Use Value: Survives ignition transients and cold-crank voltage dips; 70 mA headroom supports future firmware expansion with added sensors. |
Use Scenario: Provides regulated 3.0V to HVAC controller MCU and wireless transceiver in commercial building thermostats. IC Role / Device Role / Timing Role: Main system regulator with SHDN controlled by MCU sleep mode; PWRGD synchronizes wake-up sequence. Use Value: 10 µA shutdown current extends battery backup life; ±2.5% tolerance ensures ADC reference accuracy across operating temperature. |
| Low-Voltage Fire Alarm Sensor | Microcontroller Power Supply |
|
Use Scenario: Powers smoke/CO detector MCU and analog front-end in 24VAC-powered building fire alarm systems. IC Role / Device Role / Timing Role: Primary 3.0V regulator converting rectified 24VAC; SHDN used for self-test activation. Use Value: 70 µA quiescent current reduces total system power draw - critical for UL-listed standby current compliance in multi-node installations. |
Use Scenario: Supplies 3.0V to ARM Cortex-M0+ or PIC MCU in industrial embedded gateways requiring high reliability. IC Role / Device Role / Timing Role: System power supervisor with thermal shutdown and PWRGD-driven reset assertion. Use Value: 157°C thermal cutoff protects against PCB overheating in sealed enclosures; 62°C/W θJA enables convection-only cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST30T3G | 3.0V fixed output, 1A max, no SHDN/PWRGD, TO-220/SOT-223, dropout ~1.2V @ 1A | Lacks integrated power sequencing; requires external enable and monitoring circuitry | Choose for higher current needs where system-level control already exists and thermal margin exceeds 157°C. |
| TPS7B6733QPWPRQ1 | 3.3V output, AEC-Q100 qualified, 250 mA, integrated watchdog timer, same SOT-223-5 pinout | Higher output voltage and automotive qualification; no direct 3.0V variant in same footprint | Choose when 3.3V is acceptable and AEC-Q100 compliance is mandatory; verify voltage compatibility with downstream logic. |
Compared with NCP1117ST30T3G, MCP1791T-3002E/DC offers integrated SHDN/PWRGD and superior transient resilience but lower current capacity; versus TPS7B6733QPWPRQ1, it provides exact 3.0V output and lower quiescent current, though without AEC-Q100 certification or watchdog functionality.
Availability
MCP1791T-3002E/DC is available at Aetrix Electronics and suitable for automotive accessory adapters, electronic thermostat controls, and low-voltage fire alarm sensors requiring stable component supply across extended temperature and transient conditions.
Supply support for MCP1791T-3002E/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 manufacturer specializing in microcontrollers, analog devices, and timing solutions for automotive, industrial, and consumer applications.
The MCP1791 series belongs to Microchip's high-voltage LDO family, engineered specifically for harsh-environment power management in automotive and commercial 12/24V DC systems - emphasizing load dump survival, ultra-low quiescent current, and integrated system supervision.
FAQ
What is the maximum input voltage rating for MCP1791T-3002E/DC?
The MCP1791T-3002E/DC has an absolute maximum input voltage of +48.0V for transient conditions such as load dump, and a continuous operating range of 6.0V to 30.0V. Exceeding 48V, even briefly, risks permanent damage. The device is tested per FORD Test Pulse G Loaded (43.5V ±10%, <500 ms, 30 s repetition).
Does MCP1791T-3002E/DC support ceramic output capacitors?
Yes, MCP1791T-3002E/DC is stable with 4.7 µF to 1000 µF X7R or X5R ceramic capacitors. A minimum of 4.7 µF is required; using 1 µF ceramic is possible only with a 0.3 Ω series resistor to compensate for low ESR-induced instability.
How does the PWRGD pin function on MCP1791T-3002E/DC?
The PWRGD pin on MCP1791T-3002E/DC is an open-drain output that asserts low when VOUT falls below 90% of 3.0V (2.7V), and goes high (when pulled up externally) when VOUT rises above 90% + hysteresis (≈2.76V). Its 30 µs rise delay and 235 µs fall delay ensure glitch-free processor reset sequencing.
What is the shutdown behavior of MCP1791T-3002E/DC?
When SHDN is pulled ≤0.8V, MCP1791T-3002E/DC disables VOUT and forces PWRGD low, reducing quiescent current to 10 µA typical. A 400 ns noise filter rejects spikes, and a 100 µs turn-on delay after SHDN rises >2.4V prevents false wakeups - total startup time to regulation is ~200 µs with 1 µF load.
Is MCP1791T-3002E/DC thermally protected?
Yes, MCP1791T-3002E/DC includes internal thermal overload protection that trips at 157°C typical junction temperature. Recovery occurs at ~137°C due to 20°C hysteresis. This protects against sustained overload or inadequate heatsinking in SOT-223-5 packages with θJA = 62°C/W.
MCP1791T-3002E/DC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-223-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 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-3002E/DC FAQ
1.How can I place an order for MCP1791T-3002E/DC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1791T-3002E/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-3002E/DC reliable?
The price and inventory of MCP1791T-3002E/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-3002E/DC is usually 5 days.
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MCP1791T-3002E/DC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1791T-3002E/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-3002E/DC?
For technical support, including MCP1791T-3002E/DC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1791T-3002E/DC requirements.
6.How does Aetrix verify that MCP1791T-3002E/DC is sourced from the original manufacturer or authorized distributors?
All MCP1791T-3002E/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-3002E/DC meets industry standards.
7.What is the process for return or replacement of MCP1791T-3002E/DC?
All MCP1791T-3002E/DC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1791T-3002E/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-3002E/DC part is unused and in its original packaging.
Return procedure for MCP1791T-3002E/DC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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