My Inquiry
My Account
Microchip Technology MCP1790T-3302E/DB
- Part No.:
- MCP1790T-3302E/DB
- Manufacturer:
- Microchip Technology
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MCP1790T-3302E/DB.pdf
- Description:
- IC REG LINEAR 3.3V 70MA SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,778
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1790T-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 across –40°C to +125°C.
For engineers reviewing the MCP1790T-3302E/DB datasheet, MCP1790T-3302E/DB pinout, MCP1790T-3302E/DB application, or MCP1790T-3302E/DB equivalent, this page provides verified package mapping (SOT-223-3), confirmed thermal shutdown (157°C), validated dropout voltage (700 mV typ. @70 mA), and real-world design meaning for load dump survival, microcontroller power sequencing, and fire alarm system compliance.
Technical Context
The MCP1790T-3302E/DB implements a CMOS-based LDO architecture with internal thermal overload protection (trip at ~157°C, hysteresis ~20°C) and foldback short-circuit current limiting (99 mA typical at 3.3V). Its VIN monitoring circuit enforces undervoltage lockout-output enables only when VIN ≥ 5.5V (typ.) and disables below ~4.0V.
It uses a precision bandgap reference and error amplifier to achieve ±0.2% typical load regulation and ±0.0002%/V line regulation. Stability is guaranteed with 4.7 µF–1000 µF ceramic, tantalum, or electrolytic output capacitors-no external compensation required.
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 supply under automotive thermal stress. |
| Max Output Current | 70 mA @ +125°C junction - supports full-load operation in engine bay or industrial enclosures without derating. |
| Input Voltage Range | 6.0V–30.0V continuous, 48V absolute max - compatible with 12V/24V battery systems and survives FORD Pulse G load dump. |
| Quiescent Current | 70 µA typical (IL = 0 mA) - enables always-on subsystems (e.g., CAN wake-up, smoke detector standby) with minimal battery drain. |
| Dropout Voltage | 700 mV typical @ 70 mA - allows regulation down to VIN = 4.0V, critical for cold-crank scenarios in automotive applications. |
| PSRR | –90 dB @ 100 Hz - suppresses alternator ripple and switching noise before reaching sensitive analog/mixed-signal circuits. |
| Thermal Shutdown | 157°C typical trip, 137°C recovery - protects against sustained overload while enabling automatic restart after cooling. |
Pinout & Package
Package: SOT-223-3 (3-lead, exposed thermal tab connected to GND). Pin 1 = VIN, Pin 2 (tab) = GND, Pin 3 = VOUT. The tab must be soldered to a PCB copper pour for thermal performance (θJA = 62°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Unregulated input supply | Accepts 6–30V DC; must withstand 48V transients; requires local 1–10 µF input capacitor for EMI filtering and transient energy absorption. |
| GND (Tab) | Ground reference & thermal path | Reference node for regulation; exposed tab is electrically GND and must be thermally coupled to PCB ground plane for safe 70 mA operation. |
| VOUT | Regulated 3.3V output | Supplies downstream logic; stable with ≥4.7 µF ceramic or ≥1 µF tantalum; ESR ≤3 Ω required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Load dump protection | Survives 48V (±10%) transients <500 ms at 30 s repetition rate per FORD ES-XW7T-1A278-AC Pulse G - eliminates need for external TVS in many automotive modules. |
| Ultra-low quiescent current | 70 µA typical (vs. >1 mA for bipolar regulators) - reduces standby power by >90%, critical for battery-backed fire alarms with hundreds of nodes. |
| Wide temperature operation | –40°C to +125°C junction range - qualified for under-hood, HVAC control, and industrial embedded environments without derating. |
| Capacitor flexibility | Stable with 4.7 µF–1000 µF ceramic, tantalum, or electrolytic - simplifies BOM and layout; avoids costly low-ESR specialty capacitors. |
| Short-circuit foldback | 99 mA foldback current at 3.3V output - limits fault power dissipation during sustained shorts, preventing thermal runaway on PCB. |
Applications
| Automotive Body Control Module (BCM) | Fire Alarm Sensor Node |
|---|---|
Use Scenario: Powering CAN transceivers, door lock actuators, and LED indicators in 12V vehicle electrical architecture. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying microcontroller I/O and communication peripherals. Use Value: Survives load dump events without reset or latch-up, eliminating field failures in 12V systems with high inductive loads. |
Use Scenario: Providing regulated 3.3V to CO₂ sensor ICs and smoke detector microcontrollers in commercial building 24VDC fire alarm loops. IC Role / Device Role / Timing Role: Always-on power source maintaining sensor readiness during mains outage via battery backup. Use Value: 70 µA quiescent current extends 24V battery life by >3× vs. legacy bipolar regulators, reducing maintenance frequency. |
| HVAC Zone Controller | Industrial Thermostat |
Use Scenario: Regulating power for digital temperature sensors, display drivers, and wireless BLE modules in 24V HVAC control panels. IC Role / Device Role / Timing Role: Main 3.3V supply for mixed-signal processing and RF subsystems. Use Value: –90 dB PSRR at 100 Hz rejects 120 Hz ripple from 24VAC-to-DC conversion, ensuring clean ADC readings and stable RF operation. |
Use Scenario: Powering programmable logic and environmental sensors in DIN-rail mounted thermostats operating in factory environments. IC Role / Device Role / Timing Role: High-reliability 3.3V rail for real-time temperature control firmware execution. Use Value: 125°C max junction rating enables operation inside sealed enclosures with no forced air cooling, lowering system cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP163AMX330TBG | 300 mA output, 250 µA IQ, 2.2V–5.5V input - higher current but narrower input range and no load dump rating. | Suitable for consumer IoT hubs; not qualified for automotive transients or extended temperature. | Select only if >70 mA is required and load dump immunity is unnecessary. |
| TPS7B6733QPWPRQ1 | Automotive AEC-Q100 Grade 1, 250 mA, 28 µA IQ, integrated enable - includes watchdog timer and reverse polarity protection. | Meets ASIL-B requirements; adds functional safety features absent in MCP1790T-3302E/DB. | Choose when ISO 26262 compliance or enhanced fault coverage is mandated. |
Compared with NCP163AMX330TBG and TPS7B6733QPWPRQ1, the MCP1790T-3302E/DB offers optimal balance of load dump survivability, ultra-low IQ, and cost for non-safety-critical automotive and industrial 24V systems where 70 mA suffices.
Availability
MCP1790T-3302E/DB is available at Aetrix Electronics and suitable for automotive body electronics, fire alarm sensor networks, HVAC zone controllers, and industrial thermostat designs requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MCP1790T-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 leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, and communications markets with high-reliability silicon and long-term product support.
The MCP1790 series was engineered specifically for harsh-environment power regulation in automotive and commercial fire safety systems-prioritizing transient robustness, low IQ, and extended temperature operation over raw current capability.
FAQ
What is the maximum input voltage rating for the MCP1790T-3302E/DB?
The MCP1790T-3302E/DB has an absolute maximum input voltage of +48.0V, with continuous operation rated from 6.0V to 30.0V. It is explicitly designed to survive 48V (43.5V ±10%) load dump transients lasting less than 500 ms at a 30-second repetition rate per FORD Test Pulse G Loaded, making it suitable for direct connection to automotive battery rails without external clamping.
Does the MCP1790T-3302E/DB include a shutdown pin?
No, the MCP1790T-3302E/DB is the 3-pin variant (VIN, GND, VOUT) of the MCP1790/MCP1791 family and does not include a shutdown (SHDN) or power-good (PWRGD) pin. Those functions are exclusive to the 5-pin MCP1791 variants. The MCP1790T-3302E/DB relies solely on input undervoltage lockout (enabling above ~5.5V, disabling below ~4.0V) for basic enable/disable control.
What output capacitor types and values are supported by the MCP1790T-3302E/DB?
The MCP1790T-3302E/DB is stable with 4.7 µF to 1000 µF ceramic capacitors (X7R/X5R dielectrics recommended), or 1 µF to 1000 µF tantalum/electrolytic capacitors. Minimum ESR must not exceed 3 Ω. Ceramic capacitors below 4.7 µF require a 0.3 Ω series resistor to ensure stability. All capacitors must be placed adjacent to the VOUT and GND pins.
What is the thermal performance of the MCP1790T-3302E/DB in SOT-223-3 package?
In the SOT-223-3 package on a standard 4-layer PCB, the MCP1790T-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 thermal pad soldering to a ≥1 cm² copper pour is essential to maintain junction temperature within –40°C to +125°C operating range under full load.
How does the MCP1790T-3302E/DB handle short-circuit conditions?
The MCP1790T-3302E/DB employs short-circuit foldback current limiting: at 3.3V output, it delivers ~99 mA into a near-zero-ohm load while reducing VOUT to ~3.0V (foldback corner). This limits power dissipation during faults, prevents thermal runaway, and enables automatic recovery once the short is removed-without requiring device reset or external intervention.
MCP1790T-3302E/DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
MCP1790T-3302E/DB FAQ
1.How can I place an order for MCP1790T-3302E/DB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1790T-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 MCP1790T-3302E/DB reliable?
The price and inventory of MCP1790T-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 MCP1790T-3302E/DB is usually 5 days.
3.What payment methods are accepted for MCP1790T-3302E/DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1790T-3302E/DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1790T-3302E/DB?
MCP1790T-3302E/DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1790T-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 MCP1790T-3302E/DB?
For technical support, including MCP1790T-3302E/DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1790T-3302E/DB requirements.
6.How does Aetrix verify that MCP1790T-3302E/DB is sourced from the original manufacturer or authorized distributors?
All MCP1790T-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 MCP1790T-3302E/DB meets industry standards.
7.What is the process for return or replacement of MCP1790T-3302E/DB?
All MCP1790T-3302E/DB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1790T-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 MCP1790T-3302E/DB part is unused and in its original packaging.
Return procedure for MCP1790T-3302E/DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1790T-3302E/DB 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…
