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Diodes Incorporated AP7370-33W5-7
- Part No.:
- AP7370-33W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-33W5-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:8,794
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Product details
Overview
AP7370-33W5-7 from Diodes Incorporated is a 3.3V fixed-output, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, and reverse current protection - deployed in portable instrumentation and battery-powered metering systems.
For engineers reviewing the AP7370-33W5-7 datasheet, AP7370-33W5-7 pinout, AP7370-33W5-7 application, or AP7370-33W5-7 equivalent, key selection criteria include wide VIN range (3.2–18V), thermal shutdown behavior, low quiescent current (≤2.5µA), and compatibility with 1µF ceramic output capacitors without ESR requirements.
Technical Context
The AP7370-33W5-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V output, current-limit circuitry (350mA typical), and chip-enable logic. Its architecture supports stable regulation under fast load transients up to 300mA while maintaining <0.5% load regulation across temperature.
It employs internal thermal shutdown (160°C trip, 20°C hysteresis) and reverse-current blocking to prevent backfeed from VOUT to VIN - critical for multi-rail battery systems where supply sequencing and isolation are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (ensures stable MCU core/logic rail within tight tolerance over -40°C to +125°C) |
| Max Input Voltage | 18V (supports direct connection to unregulated 12V/15V rails or automotive battery inputs with transient margin) |
| Dropout Voltage | 500mV @ 100mA (enables 3.3V output from as low as 3.8V input - critical for Li-ion single-cell operation) |
| Quiescent Current | ≤2.5µA @ no load (extends battery life in always-on sensor nodes and portable meters) |
| Current Limit | 350mA (protects against short-circuit faults while sustaining full rated load under nominal conditions) |
| Thermal Shutdown | 160°C with 20°C hysteresis (prevents permanent damage during sustained overload or poor PCB heatsinking) |
| ESD Rating | HBM 6kV (robust handling during assembly and field service in industrial handheld devices) |
Pinout & Package
SOT25 (W5) package: 5-pin surface-mount, RoHS-compliant, 2.8mm × 2.9mm footprint with exposed pad not present (non-thermal variant). Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pins 4–5 = NC (no-connect for fixed-output version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V with internal overvoltage clamp |
| 2 | GND | Analog ground reference for regulator feedback and error amplifier; must be low-impedance path |
| 3 | VOUT | Stable 3.3V regulated output; requires ≥1µF ceramic capacitor (X5R/X7R) for stability |
| 4, 5 | NC | No internal connection; left floating or tied to GND per layout best practice (no functional impact) |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.2–18V) | Eliminates need for pre-regulation stages in mixed-voltage systems - e.g., direct step-down from 12V wall adapter to 3.3V logic rail |
| Ultra-low IQ (≤2.5µA) | Enables >1-year battery life in low-duty-cycle IoT sensors using CR2032 or AA alkaline cells |
| Reverse current protection | Blocks backflow from VOUT to VIN when input is removed - prevents unintended power-up of upstream circuits |
| Low-ESR capacitor compatible | Stable with standard 1µF X5R ceramics (no minimum ESR requirement), reducing BOM count and board space |
| Thermal shutdown + hysteresis | Self-recovering fault response avoids latch-up; 20°C hysteresis ensures reliable restart after cooling |
Applications
| Metering Systems | Portable Weighing Scales |
|---|---|
Use Scenario: Digital multimeter with LCD display, microcontroller, and analog front-end powered from 9V alkaline battery. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying MCU, ADC reference, and display driver. Use Value: 500mV dropout enables >600 hours runtime on fresh 9V battery; ±1% accuracy maintains ADC measurement integrity. |
Use Scenario: Battery-operated platform scale with Bluetooth LE connectivity and auto-zero calibration. IC Role / Device Role / Timing Role: Regulated 3.3V rail for load-cell signal conditioning, BLE SoC, and EEPROM. Use Value: Reverse current protection isolates BLE module during battery swap; 2.5µA IQ extends standby time beyond 18 months. |
| Laptop Peripheral Devices | Handheld Test Instruments |
Use Scenario: USB-powered external DAC dongle drawing variable current (10–250mA) from host port. IC Role / Device Role / Timing Role: Post-USB 5V regulation to clean 3.3V for audio codec and FPGA configuration. Use Value: Excellent line regulation (0.05%/V) rejects USB port ripple; 350mA limit protects host port during fault. |
Use Scenario: Pocket-sized oscilloscope probe interface with isolated analog front-end and ARM Cortex-M4. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for precision op-amps and high-speed ADC reference. Use Value: Low ground current minimizes IR drop in shared ground plane; thermal shutdown prevents overheating in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-33W5-7 | Successor device; same pinout, improved PSRR (65dB @ 1kHz), lower dropout (400mV @ 100mA), and enhanced thermal performance (θJA = 140°C/W) | Recommended for new designs requiring higher noise immunity or tighter thermal margins | Select AP7375-33W5-7 if designing for production beyond Q3 2024; AP7370-33W5-7 remains viable for legacy replacement or cost-sensitive volume builds |
| MCP1703T-3302E/MB | Different package (SOT-23-3), lower IOUT (250mA), higher dropout (600mV @ 100mA), no reverse current protection | Suitable only for low-current, non-isolated applications where board space is constrained | Use only if SOT-23-3 footprint is mandatory and reverse current blocking is unnecessary; verify thermal derating at 250mA |
Compared with AP7370-33W5-7, the AP7375-33W5-7 delivers measurable improvements in PSRR and thermal resistance while maintaining pin-for-pin compatibility, whereas the MCP1703T-3302E/MB trades protection features and current capability for smaller size - making it a functional but technically inferior substitute in demanding applications.
Availability
AP7370-33W5-7 is available at Aetrix Electronics and suitable for battery-powered equipment, portable information appliances, and metering systems requiring stable component supply with long-term industrial availability.
Supply support for AP7370-33W5-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP7370 series belongs to Diodes' high-reliability ULDO product line, engineered specifically for portable and battery-constrained systems needing wide-input, low-quiescent-current regulation with robust protection features.
FAQ
Is AP7370-33W5-7 recommended for new designs?
No - Diodes Incorporated explicitly marks AP7370-33W5-7 as "NOT RECOMMENDED FOR NEW DESIGN" in its datasheet (Rev. 2-3, April 2024), citing the introduction of the improved AP7375 series. It remains fully supported for existing designs and legacy replacements, with no announced obsolescence date.
What is the minimum input voltage required for 3.3V regulation?
The minimum input voltage is 3.2V per Recommended Operating Conditions. However, due to the 500mV dropout at 100mA, stable 3.3V output requires VIN ≥ 3.8V under that load. At lighter loads (<10mA), regulation holds down to VIN = 3.3V + VDROP(min) ≈ 3.35V.
Can AP7370-33W5-7 drive a 300mA load continuously?
Yes - its absolute maximum rating is 500mA, and electrical characteristics specify current limit at 350mA (typical) for VOUT = 3.3V. Continuous 300mA operation is supported provided PCB thermal design meets θJA ≤ 155°C/W (SOT25) and junction temperature stays below +125°C.
Does AP7370-33W5-7 require an input capacitor?
While not strictly mandatory per datasheet, a 1µF ceramic input capacitor placed near VIN/GND pins is strongly recommended to suppress high-frequency noise and improve transient response - especially when sourced from long traces or switching supplies. Output capacitor (≥1µF) is mandatory for stability.
AP7370-33W5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP7370-33W5-7 FAQ
1.How can I place an order for AP7370-33W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33W5-7 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 AP7370-33W5-7 reliable?
The price and inventory of AP7370-33W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33W5-7 is usually 5 days.
3.What payment methods are accepted for AP7370-33W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33W5-7?
AP7370-33W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33W5-7 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 AP7370-33W5-7?
For technical support, including AP7370-33W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33W5-7 requirements.
6.How does Aetrix verify that AP7370-33W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-33W5-7 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 AP7370-33W5-7 meets industry standards.
7.What is the process for return or replacement of AP7370-33W5-7?
All AP7370-33W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33W5-7, 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 AP7370-33W5-7 part is unused and in its original packaging.
Return procedure for AP7370-33W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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