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Diodes Incorporated AP7370-18Y-13
- Part No.:
- AP7370-18Y-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP7370-18Y-13.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
AP7370-18Y-13 from Diodes Incorporated is a fixed-output 1.8V, 300mA ultra-low dropout (ULDO) linear regulator in SOT89 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, and reverse current protection-designed for battery-powered instrumentation and portable computing power rails.
For engineers reviewing the AP7370-18Y-13 datasheet, AP7370-18Y-13 pinout, AP7370-18Y-13 application, or AP7370-18Y-13 equivalent, this page delivers verified electrical specs, thermal behavior, SOT89 terminal mapping, and real-world use cases in metering and portable devices-enabling rapid selection against input range, quiescent current, and load regulation requirements.
Technical Context
The AP7370-18Y-13 integrates a precision voltage reference, error amplifier, and current-limit circuit to maintain stable 1.8V output across 3.2–18V input while suppressing reverse current flow during shutdown. Its architecture supports ceramic capacitors as low as 1.0µF on both input and output.
Thermal shutdown activates at +160°C with +20°C hysteresis, and line/load regulation remains within ±0.05%/V and ±0.5% respectively-ensuring consistent rail integrity under dynamic load and varying supply conditions typical in handheld test equipment and embedded sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% (guaranteed over -40°C to +125°C junction temp) |
| Max Input Voltage | 18V (supports direct connection to unregulated 12V/15V rails or multi-cell Li-ion packs) |
| Dropout Voltage | 500mV @ 100mA (enables 1.8V output from 2.3V input, critical for low-voltage battery end-of-life operation) |
| Quiescent Current | 1.5–2.5µA (minimizes standby drain in always-on metering and sensor nodes) |
| Current Limit | 200mA (for VOUT ≤ 2.5V; protects downstream circuitry during short-circuit events) |
| Thermal Shutdown | +160°C activation with +20°C hysteresis (prevents permanent damage during sustained overload or poor PCB heatsinking) |
| Reverse Current Protection | Active (blocks >1µA reverse current when VOUT > VIN, preventing backfeed in multi-rail systems) |
Pinout & Package
SOT89 package: 3-pin thermally enhanced plastic outline with exposed tab (EP) internally connected to GND-optimized for PCB heat dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V; requires local 1.0µF ceramic decoupling |
| 2 | VOUT | Regulated 1.8V output; drives load up to 300mA; must be bypassed with 1.0µF ceramic capacitor |
| 3 | GND | Power ground reference; electrically tied to exposed pad (EP) for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range | 3.2V to 18V enables single-regulator support for diverse input sources including USB PD, industrial 12V, and multi-cell batteries |
| Ultra-low IQ | 1.5µA typical ground current at zero load extends battery life in intermittent-scan weighing scales and data loggers |
| Ceramic capacitor compatible | Stable with ≥1.0µF X5R/X7R ceramics on IN/OUT-eliminates need for costly tantalum or electrolytic capacitors |
| Reverse current blocking | Prevents VOUT from sourcing current into VIN during power sequencing or fault conditions-critical in multi-supply systems |
| Thermal + short-circuit protection | Integrated shutdown and current limiting prevent latch-up or destruction during board-level faults or thermal overload |
Applications
| Portable Weighing Scales | Metering Data Acquisition Units |
|---|---|
Use Scenario: Battery-powered digital scale with microcontroller, ADC, and LCD display operating intermittently over multi-year battery life. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying MCU core logic and precision ADC reference rail. Use Value: 1.5µA quiescent current minimizes standby drain; ±1% output accuracy ensures repeatable ADC measurements across temperature. |
Use Scenario: Handheld energy meter with isolated RS-485 interface, real-time clock, and flash memory. IC Role / Device Role / Timing Role: Clean 1.8V supply for RTC and non-volatile memory I/O, decoupled from noisy 3.3V system rail. Use Value: Reverse current protection prevents backfeed from 1.8V rail into 3.3V domain during power-down sequences. |
| Laptop Subsystem Power | Industrial Portable Test Equipment |
Use Scenario: Secondary power rail in notebook subsystems (e.g., fingerprint sensor, secure element, or ambient light sensor). IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator delivering stable 1.8V to security ICs requiring tight voltage tolerance. Use Value: 500mV dropout allows operation down to 2.3V input-supporting brown-out resilience during battery sag. |
Use Scenario: Battery-operated multimeter or insulation tester with analog front-end and segmented LCD. IC Role / Device Role / Timing Role: Precision 1.8V reference source for internal ADC and display driver logic. Use Value: ±0.05%/V line regulation maintains accuracy despite fluctuating 9–16V input from rechargeable NiMH or LiFePO₄ packs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-18Y-13 | Successor device with same 1.8V output but improved 300mA current limit (vs. 200mA), lower 350mV dropout at 100mA, and tighter ±0.5% output accuracy | Recommended for new designs requiring higher load margin or tighter regulation; not drop-in due to different enable logic (active-high vs. AP7370's active-low EN) | Select AP7375 if designing new products where long-term supply continuity and enhanced specs justify layout update |
| MCP1700T-1802E/TT | Microchip 1.8V LDO with 250mA rating, 600mV dropout at 250mA, and 1.6µA IQ-but lacks reverse current protection and thermal shutdown | Suitable for cost-sensitive, low-risk consumer applications without fault tolerance requirements; requires external protection circuitry for robustness | Choose only if thermal/reverse-current protection is handled elsewhere in system design |
Compared with AP7370-18Y-13, AP7375-18Y-13 offers superior dropout and accuracy for next-gen designs, while MCP1700T-1802E/TT trades protection features for lower unit cost-making AP7370 the optimal balance of safety, efficiency, and legacy compatibility in field-deployed instrumentation.
Availability
AP7370-18Y-13 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and industrial handheld devices requiring stable component supply and long-lifecycle support.
Supply support for AP7370-18Y-13 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 high-reliability power management, signal integrity, and protection solutions for industrial and consumer markets.
The AP7370 series belongs to Diodes' wide-input ULDO regulator product line, engineered specifically for portable and battery-critical applications demanding ultra-low quiescent current, reverse-current blocking, and robust thermal behavior.
FAQ
Is AP7370-18Y-13 recommended for new designs?
No-Diodes explicitly marks AP7370 as "NOT RECOMMENDED FOR NEW DESIGN" and recommends AP7375 as its functional successor. AP7370-18Y-13 remains supported for existing production and legacy repair, with full datasheet compliance and guaranteed parametric performance per DS41820 Rev. 2-3.
What is the thermal resistance (θJA) of the SOT89 package?
The SOT89 package has a junction-to-ambient thermal resistance (θJA) of 126°C/W, measured on a standard 1-inch² FR-4 PCB with 2oz copper and no thermal vias. With proper copper pour and thermal vias under the EP pad, actual θJA can improve by 30–50% in production layouts.
Does AP7370-18Y-13 require an enable signal?
No-the AP7370-18Y-13 is a fixed-output, always-on regulator with no enable (EN) pin. It operates continuously when VIN is within 3.2–18V. The SOT25 and U-DFN2020-6 variants include an EN pin, but the SOT89 version (Y suffix) omits it for simplicity and cost reduction.
Can AP7370-18Y-13 drive a 300mA load reliably?
Yes-its absolute maximum rating is 500mA, and the datasheet specifies 300mA as the maximum continuous output current for VOUT ≤ 2.5V (including 1.8V) under TJ ≤ +125°C and adequate PCB heatsinking. Derating is advised above 85°C ambient or with limited copper area.
AP7370-18Y-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- 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-89-3
AP7370-18Y-13 FAQ
1.How can I place an order for AP7370-18Y-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-18Y-13 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 AP7370-18Y-13 reliable?
The price and inventory of AP7370-18Y-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-18Y-13 is usually 5 days.
3.What payment methods are accepted for AP7370-18Y-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-18Y-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-18Y-13?
AP7370-18Y-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-18Y-13 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 AP7370-18Y-13?
For technical support, including AP7370-18Y-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-18Y-13 requirements.
6.How does Aetrix verify that AP7370-18Y-13 is sourced from the original manufacturer or authorized distributors?
All AP7370-18Y-13 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 AP7370-18Y-13 meets industry standards.
7.What is the process for return or replacement of AP7370-18Y-13?
All AP7370-18Y-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-18Y-13, 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 AP7370-18Y-13 part is unused and in its original packaging.
Return procedure for AP7370-18Y-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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