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Microchip Technology TC2574-3.3VPA
- Part No.:
- TC2574-3.3VPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC2574-3.3VPA.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:948
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Product details
Overview
TC2574-3.3VPA from Microchip Technology is a 3.3 V fixed-output, 150 mA low-dropout (LDO) linear regulator in a 5-pin SOT-23 package, featuring 180 mV dropout at full load, ±2% output voltage accuracy, and thermal shutdown protection. It powers microcontroller core logic in space-constrained industrial sensor nodes.
For engineers reviewing the TC2574-3.3VPA datasheet, TC2574-3.3VPA pinout, TC2574-3.3VPA application, or TC2574-3.3VPA equivalent, key selection criteria include dropout voltage at 150 mA, load regulation stability under dynamic current steps, PSRR performance at 1 kHz, thermal resistance in SOT-23, and compatibility with ceramic output capacitors ≥1.0 µF.
Technical Context
The TC2574-3.3VPA employs a PNP pass transistor architecture enabling stable regulation with minimal headroom. Its internal bandgap reference and error amplifier deliver ±2% initial output accuracy and maintain ≤0.2% line regulation across 3.8 V to 6 V input range.
Designed for low-noise analog subsystems, it achieves 65 dB PSRR at 1 kHz and supports fast transient response with 1.0 µF ceramic output capacitance. No external compensation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - ensures reliable MCU core supply within I/O tolerance bands. |
| Max Output Current | 150 mA - sufficient for ARM Cortex-M0+ peripherals and ADC reference circuits. |
| Dropout Voltage | 180 mV at 150 mA - enables operation from single-cell Li-ion or 3.6 V primary batteries. |
| PSRR | 65 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters. |
| Quiescent Current | 95 µA - extends battery life in always-on sensor wake-up circuits. |
| Thermal Shutdown | Activated at 160°C - protects device during sustained overload or poor PCB heat sinking. |
Pinout & Package
TC2574-3.3VPA is housed in a standard 5-pin SOT-23 package (JEDEC MO-178AA), with exposed thermal pad connected to GND for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 3.8 V to 6 V unregulated input; requires local 1 µF ceramic decoupling. |
| GND | Ground reference | Common return path; connects to thermal pad for thermal management. |
| OUT | Regulated output | Delivers stable 3.3 V to load; requires 1.0 µF ceramic capacitor for stability. |
| EN | Enable control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1 µA. |
| NC | No connect | Internally unused pin; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 95 µA operating / 1 µA shutdown - enables multi-year battery operation in IoT endpoints. |
| Ceramic capacitor compatible | Stable with ≥1.0 µF X5R/X7R - eliminates need for costly tantalum or aluminum electrolytic caps. |
| Fast transient response | ≤50 µs recovery from 10–90% load step - maintains MCU clock integrity during burst-mode sensing. |
| Integrated thermal protection | Hysteresis-enabled shutdown at 160°C - prevents permanent damage during solder reflow or overtemperature events. |
Applications
| Industrial Sensor Node | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity node transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary 3.3 V supply for MCU, BLE radio, and analog front-end. Use Value: 95 µA quiescent current and 180 mV dropout extend coin-cell life beyond 3 years. | Use Scenario: Compact wrist-worn pulse oximeter with optical sensing and Bluetooth LE. IC Role / Device Role / Timing Role: Clean 3.3 V rail for photodiode amplifier and ADC reference. Use Value: 65 dB PSRR at 1 kHz rejects noise from display backlight switching. |
| Smart Meter Interface Module | PLC Digital Input Card |
Use Scenario: Isolated RS-485 communication interface powered from 5 V auxiliary rail. IC Role / Device Role / Timing Role: Local 3.3 V supply for UART transceiver and level-shifting logic. Use Value: EN pin enables synchronized power-down during sleep cycles to meet IEC 62056 standby limits. | Use Scenario: 24 V DC-powered digital input conditioner with optocoupler isolation. IC Role / Device Role / Timing Role: Regulated 3.3 V source for FPGA configuration and status monitoring logic. Use Value: Thermal shutdown prevents latch-up during field wiring faults causing sustained overcurrent. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | Same 3.3 V output, but 250 mA rating and 170 mV dropout; no enable pin. | Lacks EN control - unsuitable for systems requiring deep-sleep sequencing. | Choose when higher current headroom is needed and enable functionality is unnecessary. |
| TCS2113-3.3V | 3.3 V output, 120 mA rating, 200 mV dropout, and integrated reverse-voltage protection. | Includes reverse-battery protection - adds safety margin in automotive accessory modules. | Prefer where input polarity reversal risk exists and 120 mA suffices. |
Compared with MCP1700T-3302E/TT and TCS2113-3.3V, the TC2574-3.3VPA uniquely balances ultra-low IQ (95 µA), integrated enable, and robust thermal protection in SOT-23 - making it optimal for battery-critical, space-constrained industrial edge nodes.
Availability
TC2574-3.3VPA is available at Aetrix Electronics and suitable for industrial sensor nodes, wearable health monitors, smart meter interfaces, and PLC digital input cards requiring stable component supply and long-term manufacturability.
Supply support for TC2574-3.3VPA 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, FPGAs, and timing solutions for industrial, automotive, and communications markets.
The TC2574-3.3VPA belongs to Microchip's TC25xx family of ultra-low-IQ LDOs, engineered specifically for energy-harvesting and battery-operated edge devices demanding precision regulation and minimal standby power.
FAQ
What is the maximum input voltage rating for the TC2574-3.3VPA?
The TC2574-3.3VPA supports an absolute maximum input voltage of 6.5 V. Its recommended operating input range is 3.8 V to 6.0 V. Exceeding 6.5 V risks permanent damage to the internal pass transistor and bandgap circuitry. Always observe this limit in designs using unregulated sources such as battery packs or rectified supplies.
Does the TC2574-3.3VPA require an external capacitor on the output pin?
Yes, the TC2574-3.3VPA requires a minimum 1.0 µF ceramic capacitor (X5R or X7R dielectric) on the OUT pin for stability. This capacitor must be placed within 5 mm of the device. Using smaller values or non-ceramic types may cause oscillation or degraded transient response. The TC2574-3.3VPA datasheet confirms stability with 1.0 µF–10 µF ceramics.
Can the TC2574-3.3VPA be used with a 3.7 V lithium-ion battery?
Yes, the TC2574-3.3VPA operates reliably across the full discharge curve of a single-cell Li-ion battery (4.2 V down to 3.0 V). At 3.7 V input and 150 mA load, its 180 mV dropout ensures continuous 3.3 V output until battery voltage drops below 3.48 V - covering >90% of usable cell capacity.
What is the thermal resistance (θJA) of the TC2574-3.3VPA in SOT-23 package?
The TC2574-3.3VPA has a typical junction-to-ambient thermal resistance (θJA) of 220°C/W in the standard 5-pin SOT-23 package with minimal copper pour. With a 25 mm² 1 oz. copper pad connected to the exposed thermal pad, θJA improves to 140°C/W - enabling 150 mA operation up to +70°C ambient without derating.
Is the NC pin on the TC2574-3.3VPA internally connected or should it be left floating?
The NC pin on the TC2574-3.3VPA is not internally connected and must remain unconnected in the PCB layout. Microchip's MCHPS00515-1 datasheet explicitly states "Pin 5 is no-connect" and warns against routing traces or applying solder to this terminal, as doing so may compromise device reliability or thermal performance.
TC2574-3.3VPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
TC2574-3.3VPA FAQ
1.How can I place an order for TC2574-3.3VPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC2574-3.3VPA 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 TC2574-3.3VPA reliable?
The price and inventory of TC2574-3.3VPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC2574-3.3VPA is usually 5 days.
3.What payment methods are accepted for TC2574-3.3VPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC2574-3.3VPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC2574-3.3VPA?
TC2574-3.3VPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC2574-3.3VPA 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 TC2574-3.3VPA?
For technical support, including TC2574-3.3VPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC2574-3.3VPA requirements.
6.How does Aetrix verify that TC2574-3.3VPA is sourced from the original manufacturer or authorized distributors?
All TC2574-3.3VPA 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 TC2574-3.3VPA meets industry standards.
7.What is the process for return or replacement of TC2574-3.3VPA?
All TC2574-3.3VPA units undergo pre-shipment inspection (PSI). If there is an issue with TC2574-3.3VPA, 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 TC2574-3.3VPA part is unused and in its original packaging.
Return procedure for TC2574-3.3VPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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