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Microchip Technology MCP1791T-5002E/DC
- Part No.:
- MCP1791T-5002E/DC
- Manufacturer:
- Microchip Technology
- Package:
- SOT-223-6
- Datasheet:
-
MCP1791T-5002E/DC.pdf
- Description:
- IC REG LINEAR 5V 70MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,369
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Product details
Overview
MCP1791T-5002E/DC from Microchip Technology is a 5-pin, fixed-output 5.0V automotive-grade LDO regulator with shutdown control and Power Good output, delivering up to 70 mA at +125°C junction temperature, featuring 48V load dump protection (≤500 ms), ±2.5% output tolerance over -40°C to +125°C, and 70 µA typical quiescent current - used in automotive accessory power adapters and microcontroller power rails.
For engineers reviewing the MCP1791T-5002E/DC datasheet, MCP1791T-5002E/DC pinout, MCP1791T-5002E/DC application, or MCP1791T-5002E/DC equivalent, this page delivers verified electrical specs, thermal behavior, shutdown timing, PWRGD threshold hysteresis, and real-world capacitor stability guidance for 24VDC fire alarm and automotive 12/24V systems.
Technical Context
The MCP1791T-5002E/DC implements a CMOS-based LDO architecture with integrated VIN monitoring, thermal shutdown at 157°C (20°C hysteresis), and short-circuit foldback limiting output current to 105 mA at 5.0V output during fault conditions. Its internal reference and error amplifier maintain tight line regulation (±0.0002%/V) and load regulation (±0.2%) across full temperature and load range.
It integrates active-low SHDN with 400 ns noise immunity and 100 µs turn-on delay, plus open-drain PWRGD with 90% VOUT threshold (±2% hysteresis) and 30 µs rising-edge delay. The device operates from 6.0V–30.0V steady-state input, withstands 48V transients per FORD Test Pulse G Loaded, and supports ceramic (4.7–1000 µF), tantalum (1–1000 µF), and electrolytic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2.5% over -40°C to +125°C - ensures stable MCU core voltage under automotive thermal cycling. |
| Max Output Current | 70 mA @ +125°C junction - sufficient for low-power microcontrollers and sensors in engine bay environments. |
| Quiescent Current | 70 µA typical (active), 10 µA typical (SHDN mode) - meets automotive ISO 16750-2 quiescent current requirements. |
| Input Voltage Range | 6.0V–30.0V continuous, 48V absolute max - supports dual-battery jump-starts and 24V commercial systems. |
| Dropout Voltage | 700 mV typical @ 70 mA - enables operation down to VIN = 5.7V while maintaining 5.0V output. |
| PSRR | -90 dB @ 100 Hz - suppresses low-frequency alternator ripple in vehicle power networks. |
| Thermal Shutdown | 157°C typical activation, 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| PWRGD Threshold | 90% of VOUT (4.5V) with 2% hysteresis - provides reliable power sequencing signal for downstream logic reset. |
Pinout & Package
SOT-223-5 surface-mount package with exposed thermal pad (GND-connected); pin 3 and pin 6 are both GND (TAB), enabling robust thermal conduction to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Active-low enable input | Pulls low ≤0.8V to disable regulator and reduce IQ to 10 µA; includes 400 ns noise filter to reject glitches. |
| 2: VIN | Unregulated input supply | Accepts 6.0–30.0V DC; withstands 48V load dump transients for ≤500 ms without damage or latch-up. |
| 3 & 6: GND (TAB) | Ground reference and thermal path | Both pins connect internally to exposed tab; must be soldered to large PCB ground plane for thermal management. |
| 4: VOUT | Regulated 5.0V 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 ≥4.5V; requires external pull-up to VOUT or system rail for logic-level signaling. |
Key Features
| Feature | Design Value |
|---|---|
| 48V Load Dump Protection | Survives FORD Test Pulse G Loaded (43.5V ±10%, <500 ms, 30 s repetition) - eliminates need for external TVS in cost-sensitive automotive modules. |
| Low Ground Current | 110 µA typical at 70 mA load - reduces wiring losses and enables smaller gauge traces in distributed 24V fire alarm systems. |
| Capacitor Flexibility | Stable with 4.7–1000 µF ceramic, 1–1000 µF tantalum, or electrolytic - simplifies BOM and allows use of low-cost, high-reliability MLCCs. |
| Power Good Timing | 30 µs PWRGD rise delay and 235 µs fall delay - provides deterministic reset sequencing for microcontrollers and ADCs. |
| Short-Circuit Foldback | 105 mA foldback limit at 5.0V output with 4.2V foldback corner - limits power dissipation during sustained shorts and aids thermal recovery. |
| Shutdown Control | 100 µs turn-on delay after SHDN high, plus 400 ns glitch immunity - prevents false wakeups in noisy automotive CAN/LIN environments. |
Applications
| Automotive Accessory Power Adapter | Microcontroller Power Supply |
|---|---|
|
Use Scenario: Powering USB-C PD accessories, Bluetooth modules, or display controllers in 12/24V vehicle cabins. IC Role / Device Role / Timing Role: Primary 5.0V LDO supplying regulated rail to peripheral ICs; PWRGD signals system readiness to host MCU. Use Value: 48V transient tolerance eliminates external TVS diode; 70 µA quiescent current extends battery life during ignition-off states. |
Use Scenario: Providing clean 5.0V supply to 8-bit/32-bit MCUs (e.g., PIC16F, SAMD21) in engine control units or body electronics. IC Role / Device Role / Timing Role: Core voltage regulator with PWRGD-driven reset assertion and SHDN-controlled sleep/wake coordination. Use Value: ±2.5% output tolerance ensures ADC reference stability; 70 mA output supports integrated peripherals without derating. |
| Low-Voltage Fire Alarm System | Electronic Thermostat Control |
|
Use Scenario: Powering smoke/CO detectors and communication nodes in commercial 24VDC fire alarm loops. IC Role / Device Role / Timing Role: Local 5.0V regulator converting 24V loop voltage to MCU and sensor supply; SHDN enables remote power cycling. Use Value: 110 µA ground current reduces total loop current draw - critical for meeting UL 864 Class A/B current budget limits. |
Use Scenario: Regulating 5.0V for HVAC controller MCUs, display drivers, and temperature sensor interfaces in residential thermostats. IC Role / Device Role / Timing Role: Main power IC with PWRGD confirming stable voltage before enabling relay drivers and wireless radios. Use Value: Stable operation from 6–30V input accommodates aging transformer outputs and brownout conditions without reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B6750QPWPRQ1 | 5.0V fixed, 150 mA output, higher IQ (120 µA), no PWRGD, AEC-Q100 Grade 1 | Lacks Power Good output and shutdown control; suited for simpler point-of-load where sequencing is handled externally | Select when higher current is needed and PWRGD/SHDN are not required; verify thermal design for 150 mA continuous load |
| NCP163AMX500TBG | 5.0V fixed, 250 mA output, 12 µA IQ, no PWRGD, industrial temp (-40°C to +125°C) | No automotive qualification or load dump rating; requires external transient protection for vehicle use | Use only in non-automotive 24V systems (e.g., industrial controls); avoid in automotive due to missing 48V pulse compliance |
Compared with TPS7B6750QPWPRQ1 and NCP163AMX500TBG, the MCP1791T-5002E/DC uniquely combines 48V load dump survival, integrated PWRGD with hysteresis, and SHDN with noise filtering - making it the only choice for automotive-compliant 5.0V power sequencing where transient resilience and deterministic startup are mandatory.
Availability
MCP1791T-5002E/DC is available at Aetrix Electronics and suitable for automotive accessory power adapters, microcontroller power supplies, and low-voltage fire alarm systems requiring stable component supply across extended temperature and transient stress conditions.
Supply support for MCP1791T-5002E/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with broad automotive, industrial, and consumer design-in support.
The MCP1791T-5002E/DC belongs to Microchip's high-voltage LDO family designed specifically for harsh-environment 12/24VDC systems - targeting automotive infotainment, body electronics, and commercial fire/safety equipment needing load dump immunity and ultra-low quiescent current.
FAQ
What is the maximum input voltage rating for the MCP1791T-5002E/DC?
The MCP1791T-5002E/DC has an absolute maximum input voltage of +48.0V, with continuous operation rated from 6.0V to 30.0V. It is specifically qualified to survive 48V (43.5V ±10%) load dump transients for durations up to 500 ms per FORD Test Pulse G Loaded, making it suitable for automotive 12V/24V battery systems.
Does the MCP1791T-5002E/DC require an external capacitor on the PWRGD pin?
No, the MCP1791T-5002E/DC does not require an external capacitor on the PWRGD pin. PWRGD is an open-drain output with internally fixed 30 µs rise delay and 235 µs fall delay; it requires only an external pull-up resistor (typically 10 kΩ to VOUT) to generate a logic-high signal when VOUT reaches 90% of nominal (4.5V).
Can the MCP1791T-5002E/DC operate with a 1 µF ceramic output capacitor?
No - the MCP1791T-5002E/DC requires a minimum of 4.7 µF ceramic output capacitance for stability. A 1 µF ceramic capacitor may cause oscillation unless a 0.3 Ω series resistor is added. For ceramic solutions, use ≥4.7 µF X7R/X5R dielectrics; tantalum or electrolytic capacitors may be as low as 1 µF.
What is the thermal shutdown behavior of the MCP1791T-5002E/DC?
The MCP1791T-5002E/DC activates thermal shutdown at approximately 157°C junction temperature and remains off until the junction cools to ~137°C (20°C hysteresis). During shutdown, output is disabled and quiescent current drops to 10 µA. Recovery is automatic once temperature falls below the hysteresis threshold.
How does the SHDN pin function on the MCP1791T-5002E/DC?
The SHDN pin on the MCP1791T-5002E/DC is an active-low control input: logic high (>2.4V) enables regulation; logic low (≤0.8V) disables output and reduces quiescent current to 10 µA typical. It includes 400 ns glitch rejection and a 100 µs turn-on delay to prevent noise-induced false starts.
MCP1791T-5002E/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):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 70mA
- Current - Output:
- 70mA
- Current - Quiescent (Iq):
- 130 µA
- Current - Supply (Max):
- 210 µA
- PSRR:
- 90dB ~ 75dB (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-5002E/DC FAQ
1.How can I place an order for MCP1791T-5002E/DC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1791T-5002E/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-5002E/DC reliable?
The price and inventory of MCP1791T-5002E/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-5002E/DC is usually 5 days.
3.What payment methods are accepted for MCP1791T-5002E/DC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1791T-5002E/DC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1791T-5002E/DC?
MCP1791T-5002E/DC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1791T-5002E/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-5002E/DC?
For technical support, including MCP1791T-5002E/DC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1791T-5002E/DC requirements.
6.How does Aetrix verify that MCP1791T-5002E/DC is sourced from the original manufacturer or authorized distributors?
All MCP1791T-5002E/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-5002E/DC meets industry standards.
7.What is the process for return or replacement of MCP1791T-5002E/DC?
All MCP1791T-5002E/DC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1791T-5002E/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-5002E/DC part is unused and in its original packaging.
Return procedure for MCP1791T-5002E/DC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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