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Diodes Incorporated AP7370-36WR-7
- Part No.:
- AP7370-36WR-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-36WR-7.pdf
- Description:
- IC REG LINEAR 3.6V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
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Product details
Overview
AP7370-36WR-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 1.5µA quiescent current - designed for power management in portable instrumentation and battery-powered USB devices.
For engineers reviewing the AP7370-36WR-7 datasheet, AP7370-36WR-7 pinout, AP7370-36WR-7 application, or AP7370-36WR-7 equivalent, this page delivers verified electrical specs, thermal performance data, SOT25 terminal mapping, real-world use cases in metering and portable computing, and validated alternative parts with documented functional trade-offs.
Technical Context
The AP7370-36WR-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.6V output, current-limit circuit (350mA min), chip enable logic, and thermal shutdown at +160°C with +20°C hysteresis. Its architecture supports stable regulation under load transients up to 300mA with <0.5% load regulation.
It operates across -40°C to +125°C junction temperature, requires only 1.0µF ceramic input/output capacitors, and blocks reverse current flow from VOUT to VIN - critical for multi-rail systems where supply sequencing or back-powering risks exist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.6V ±1% - ensures stable MCU core or sensor bias within tight tolerance across temperature and line variation. |
| Max Input Voltage | 18V - enables direct connection to unregulated 12V rails or automotive-derived supplies without pre-regulation. |
| Dropout Voltage | 500mV @ 100mA - allows 3.6V output from 4.1V input, maximizing battery runtime in single-cell Li-ion or 3xAA configurations. |
| Quiescent Current | 1.5µA @ zero load - minimizes standby power loss in always-on metering or IoT edge nodes. |
| Current Limit | 350mA minimum - provides robust short-circuit protection while supporting peak loads of microcontrollers and displays. |
| Thermal Shutdown | +160°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Line Regulation | 0.05%/V - maintains output stability despite input ripple or battery sag over full 3.2–18V range. |
Pinout & Package
AP7370-36WR-7 is housed in a RoHS-compliant SOT25 (WR) package - 3.0mm × 2.8mm × 1.3mm body with gull-wing leads, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V; must be decoupled with ≥1µF ceramic capacitor. |
| 2 | GND | Power ground reference; low-impedance return path essential for noise immunity and thermal dissipation. |
| 3 | VOUT | Regulated 3.6V output; drives load up to 300mA; requires local 1µF ceramic capacitor for stability. |
| 4 | NC | No-connect terminal; electrically isolated; must not be tied to any net or used as thermal pad. |
| 5 | NC | No-connect terminal; electrically isolated; no internal connection; leave floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range | 3.2V to 18V operation eliminates need for external buck pre-regulator in industrial or automotive auxiliary rails. |
| Reverse Current Protection | Blocks >1µA reverse current from VOUT to VIN - prevents battery drain when main supply disconnects in dual-source systems. |
| Low ESR Capacitor Compatible | Stable with 1.0µF ceramic capacitors only - reduces BOM cost and board space vs. tantalum or electrolytic alternatives. |
| Ultra-Low IQ | 1.5µA ground current at zero load - extends shelf life and operational time in battery-powered weighing scales and portable meters. |
| Thermal & Short-Circuit Protection | Integrated shutdown at +160°C and current limiting at 350mA - enables safe operation without external protection circuitry. |
Applications
| Portable Weighing Scales | Metering Data Loggers |
|---|---|
Use Scenario: Battery-powered digital scales requiring stable 3.6V rail for ADC reference and microcontroller core voltage. IC Role / Device Role / Timing Role: Primary LDO supplying precision analog front-end and low-power MCU; no timing function. Use Value: ±1% output accuracy ensures consistent ADC conversion across battery discharge; 1.5µA IQ extends 2-year battery life. |
Use Scenario: Energy metering modules logging voltage/current waveforms using 16-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Clean 3.6V analog supply for ADC reference and signal chain; isolates noise from digital subsystem. Use Value: 0.05%/V line regulation rejects mains-induced ripple; reverse current protection prevents backfeed during auxiliary power switchover. |
| Laptop Peripheral Adapters | USB-Powered Test Instruments |
Use Scenario: Compact USB-C PD adapter dongles powering external sensors or interface ICs from 5–20V USB PD input. IC Role / Device Role / Timing Role: Secondary LDO generating 3.6V for I²C peripherals and level-shifting logic; no clock generation. Use Value: 18V max input accommodates full USB PD range; 500mV dropout enables efficient 3.6V output even at 4.1V input. |
Use Scenario: Handheld multimeters and oscilloscope probes drawing power solely from USB host port. IC Role / Device Role / Timing Role: Main regulator converting 5V USB to precise 3.6V for mixed-signal SoC and display driver. Use Value: Thermal shutdown (+160°C) protects against enclosure overheating during extended measurements; SOT25 footprint fits <10mm² PCB area. |
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 | Successor device with same 3.6V output but improved 300mV dropout @ 100mA and lower 0.8µA IQ. | Recommended for new designs requiring longer battery life or tighter dropout margin; pin-compatible with AP7370-36WR-7 in SOT25. | Select AP7375 if designing new products; AP7370 remains viable for legacy BOM continuity or cost-sensitive replacements. |
| MCP1703T-3602E/MB | Microchip 3.6V LDO with 600mV dropout @ 250mA and 2.5µA IQ; lacks reverse current protection. | Suitable for non-backpowering applications where thermal margin is less constrained; different SOT89-3 package. | Choose only if SOT89-3 footprint is required and reverse current blocking is unnecessary; verify thermal derating at 300mA. |
Compared with AP7370-36WR-7, AP7375-36W5-7 offers superior efficiency and lower dropout for next-gen designs, while MCP1703T-3602E/MB trades reverse current protection for broader vendor availability - making AP7370 optimal for drop-in replacement in existing SOT25-based metering and portable instrument platforms.
Availability
AP7370-36WR-7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and USB-powered embedded peripherals requiring stable component supply with long-term lifecycle support.
Supply support for AP7370-36WR-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 solutions for power management, signal integrity, and connectivity applications.
The AP7370 series belongs to Diodes' high-reliability ULDO regulator product line, engineered specifically for battery-constrained and wide-input industrial applications where precision, low IQ, and reverse current blocking are mandatory.
FAQ
What is the maximum continuous output current for AP7370-36WR-7?
The AP7370-36WR-7 is rated for 300mA continuous output current under recommended operating conditions (TJ ≤ +125°C, VIN ≤ 18V). Its current limit is guaranteed ≥350mA, but thermal limits in SOT25 constrain practical continuous delivery to 300mA with adequate PCB copper pour. Derating is required above +85°C ambient.
Does AP7370-36WR-7 require an external enable signal?
No - AP7370-36WR-7 has no enable pin and operates continuously when VIN is within 3.2V–18V. It lacks active shutdown control; power-down is achieved only by removing input voltage. This simplifies design for always-on applications like data loggers but precludes software-controlled power gating.
Can AP7370-36WR-7 be used with ceramic capacitors smaller than 1.0µF?
No - the datasheet specifies 1.0µF minimum ceramic capacitance on both input and output for stability across all operating conditions. Using smaller values risks oscillation or poor transient response, especially under 100mA+ load steps. X5R/X7R dielectrics with ≤100mΩ ESR are required.
Is AP7370-36WR-7 pin-compatible with other SOT25 LDOs?
Pinout matches standard SOT25 (5-pin) LDO configuration (VIN-GND-VOUT-NC-NC), but electrical compatibility depends on function. It is not pin-compatible with adjustable regulators or those lacking reverse current protection. Always verify pin function mapping - e.g., some SOT25 parts assign pin 4/5 to feedback or enable.
AP7370-36WR-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
AP7370-36WR-7 FAQ
1.How can I place an order for AP7370-36WR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-36WR-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 AP7370-36WR-7 reliable?
The price and inventory of AP7370-36WR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-36WR-7 is usually 5 days.
3.What payment methods are accepted for AP7370-36WR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-36WR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-36WR-7?
AP7370-36WR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-36WR-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 AP7370-36WR-7?
For technical support, including AP7370-36WR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-36WR-7 requirements.
6.How does Aetrix verify that AP7370-36WR-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-36WR-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 AP7370-36WR-7 meets industry standards.
7.What is the process for return or replacement of AP7370-36WR-7?
All AP7370-36WR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-36WR-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 AP7370-36WR-7 part is unused and in its original packaging.
Return procedure for AP7370-36WR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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