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Diodes Incorporated AP7370-36WW-7
- Part No.:
- AP7370-36WW-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-36WW-7.pdf
- Description:
- IC REG LINEAR 3.6V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,984
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Product details
Overview
AP7370-36WW-7 from Diodes Incorporated is a 3.6V fixed-output, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, reverse current protection, and thermal shutdown. It delivers stable power to USB peripherals, portable instrumentation, and battery-powered metering systems.
For engineers reviewing the AP7370-36WW-7 datasheet, AP7370-36WW-7 pinout, AP7370-36WW-7 application, or AP7370-36WW-7 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions for SOT25 layout, and confirmed alternative options with functional trade-offs.
Technical Context
The AP7370-36WW-7 integrates a precision voltage reference, error amplifier, and resistor network to regulate output at exactly 3.6V with ±1% tolerance over -40°C to +125°C junction temperature. Its low-quiescent-current architecture draws only 1.5–2.5µA at zero load and maintains regulation down to 3.2V input.
It implements active current limiting (350mA typical), thermal shutdown at +160°C with +20°C hysteresis, and reverse current blocking-enabling safe operation during input brownout or output back-driving in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6V ±1% - ensures stable MCU core or sensor bias without external feedback resistors. |
| Max Input Voltage | 18V - supports wide-input industrial or automotive-supplied rails without pre-regulation. |
| Dropout Voltage | 500mV @ 100mA - enables 3.6V output from as low as 4.1V input, extending battery runtime. |
| Quiescent Current | 1.5–2.5µA - minimizes standby power loss in always-on portable devices. |
| Current Limit | 350mA typical - protects downstream circuitry during short-circuit or overload events. |
| Thermal Shutdown | +160°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Reverse Current Protection | Integrated - blocks >1µA reverse current when VOUT > VIN, eliminating need for external blocking diode. |
Pinout & Package
AP7370-36WW-7 uses the SOT25 (WW variant) 5-pin surface-mount package with exposed pad not connected internally. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pins 4–5 = NC (no connection) - enabling simplified PCB routing and compatibility with standard SOT25 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply rail; accepts 3.2–18V DC with internal ESD protection up to 1500V (CDM). |
| 2 | GND | Analog and power ground reference; must be tied directly to low-impedance PCB ground plane. |
| 3 | VOUT | Regulated 3.6V output; requires ≥1µF ceramic capacitor (low-ESR) for stability per datasheet. |
| 4, 5 | NC | No internal connection; left floating or grounded per layout best practice - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (up to 18V) | Eliminates need for upstream buck converter in 12V or 15V-powered portable instruments. |
| Ultra-low quiescent current (1.5–2.5µA) | Extends shelf life and operational time in coin-cell–powered weighing scales and data loggers. |
| Low dropout (500mV @ 100mA) | Enables full 3.6V output from partially discharged Li-ion (3.4V) or 4xAA alkaline (4.2V) sources. |
| Reverse current protection | Prevents backfeed into VIN during hot-swap or multi-supply sequencing, avoiding system-level faults. |
| Thermal shutdown with hysteresis | Provides self-recovery after fault clearance without requiring external reset circuitry. |
Applications
| Battery-Powered Weighing Scales | Portable Data Acquisition Units |
|---|---|
Use Scenario: Precision load-cell signal conditioning powered by 3×AA alkaline batteries with variable voltage (4.5V → 3.0V). IC Role / Device Role / Timing Role: Primary 3.6V analog supply for 24-bit ADC and low-noise op-amps. Use Value: Maintains ±1% output accuracy across battery discharge curve while drawing <2.5µA in sleep mode. |
Use Scenario: Handheld environmental sensor node with GPS, BLE, and multi-channel analog front-end. IC Role / Device Role / Timing Role: Clean 3.6V rail for RF transceiver and precision reference ICs. Use Value: Reverse current blocking prevents BLE module from back-powering main LDO during deep-sleep wake-up transitions. |
| USB-Powered Test Instruments | Industrial Portable Meters |
Use Scenario: Benchtop multimeter powered via USB-C PD (5V/9V/15V) with internal analog section requiring 3.6V. IC Role / Device Role / Timing Role: Post-regulator for noise-sensitive analog measurement circuits. Use Value: 0.05%/V line regulation ensures stable reference voltage despite USB port voltage variation. |
Use Scenario: Rugged handheld clamp meter operating from 9–18V industrial supply with extended temperature range. IC Role / Device Role / Timing Role: Main 3.6V supply for microcontroller, display driver, and isolation interface. Use Value: Thermal shutdown at +160°C protects against failure in sealed enclosures under high ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-36W5-7 | Same pinout, improved 0.5% output accuracy, lower 300mV dropout at 100mA, but higher 3.5µA quiescent current. | Preferred for high-precision analog systems where accuracy outweighs standby power budget. | Select when ±0.5% output tolerance is required and thermal margin allows higher IQ. |
| MCP1703T-3602E/MB | 3.6V fixed, 250mA, 600mV dropout @ 100mA, 2.5µA IQ, SOT23-3 package (3-pin, no NC pins). | Suitable for space-constrained designs where NC pins complicate layout or cost sensitivity favors 3-pin footprint. | Choose when board area is critical and 250mA output suffices; verify thermal performance in SOT23. |
Compared with AP7370-36WW-7, AP7375-36W5-7 offers tighter regulation and lower dropout at the cost of higher quiescent current, while MCP1703T-3602E/MB trades output current and thermal capability for smaller footprint and simpler routing.
Availability
AP7370-36WW-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data acquisition units, and USB-powered test equipment requiring stable component supply with long-term lifecycle visibility.
Supply support for AP7370-36WW-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7370 series belongs to Diodes' high-voltage ULDO regulator product line, designed specifically for portable and battery-operated applications demanding wide input range, ultra-low IQ, and robust protection features.
FAQ
Is AP7370-36WW-7 recommended for new designs?
No - Diodes Incorporated explicitly marks AP7370-36WW-7 as "NOT RECOMMENDED FOR NEW DESIGN" in its official datasheet (DS41820 Rev. 2-3, April 2024). The AP7375 series is designated as the preferred replacement, offering improved accuracy and lower dropout. Legacy designs may continue using AP7370-36WW-7 with full datasheet compliance, but new projects should evaluate AP7375-36W5-7 or other qualified alternatives.
What is the maximum continuous output current for AP7370-36WW-7?
The AP7370-36WW-7 is rated for 300mA continuous output current under specified thermal conditions. Absolute maximum rating is 500mA, but sustained operation above 300mA requires careful PCB thermal design due to θJA = 155°C/W in SOT25. At 300mA and 25°C ambient, junction temperature rise is ~46°C - staying within the +125°C max operating TJ if board copper area and airflow are adequate.
Can AP7370-36WW-7 operate with a 1µF ceramic output capacitor?
Yes - the datasheet explicitly specifies COUT = 1.0µF ceramic as the standard condition for all electrical characteristics, including line/load regulation and transient response. The device is optimized for low-ESR ceramic capacitors and does not require tantalum or electrolytic types. Stability is guaranteed with X5R/X7R dielectrics meeting 1µF ±20% tolerance at DC bias.
Does AP7370-36WW-7 require an input capacitor?
Yes - although not explicitly mandated in the absolute minimum configuration, the datasheet recommends a 1µF ceramic input capacitor placed close to VIN and GND pins to suppress high-frequency noise and improve transient response. Without it, line regulation degrades above 100kHz and startup behavior may become erratic under fast-rising input conditions, especially when sourced from switching regulators or long PCB traces.
AP7370-36WW-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):
- 3.6V
- 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
AP7370-36WW-7 FAQ
1.How can I place an order for AP7370-36WW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-36WW-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 AP7370-36WW-7 reliable?
The price and inventory of AP7370-36WW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-36WW-7 is usually 5 days.
3.What payment methods are accepted for AP7370-36WW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-36WW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-36WW-7?
AP7370-36WW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-36WW-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 AP7370-36WW-7?
For technical support, including AP7370-36WW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-36WW-7 requirements.
6.How does Aetrix verify that AP7370-36WW-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-36WW-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 AP7370-36WW-7 meets industry standards.
7.What is the process for return or replacement of AP7370-36WW-7?
All AP7370-36WW-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-36WW-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 AP7370-36WW-7 part is unused and in its original packaging.
Return procedure for AP7370-36WW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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