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Diodes Incorporated AP7370-18WW-7
- Part No.:
- AP7370-18WW-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-18WW-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
AP7370-18WW-7 from Diodes Incorporated is a 1.8V 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 battery-powered instrumentation and portable USB devices.
For engineers reviewing the AP7370-18WW-7 datasheet, AP7370-18WW-7 pinout, AP7370-18WW-7 application, or AP7370-18WW-7 equivalent, this regulator supports stable low-noise power delivery in space-constrained designs where wide VIN range, thermal shutdown, and ceramic capacitor compatibility are critical selection criteria.
Technical Context
The AP7370-18WW-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, current-limit circuitry (200mA min), chip enable logic, and thermal shutdown with 20°C hysteresis. Its architecture enables operation down to 3.2V input while maintaining regulation up to 18V.
It delivers ±1% output voltage accuracy over -40°C to +125°C junction temperature, achieves 0.05%/V line regulation and 0.5% load regulation, and blocks reverse current via internal MOSFET control - eliminating need for external blocking diodes in battery backup paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - ensures stable core voltage for low-power microcontrollers and sensors without external feedback. |
| Max Input Voltage | 18V - supports direct connection to unregulated 12V/15V rails or multi-cell battery stacks without pre-regulation. |
| Dropout Voltage | 500mV @ 100mA - enables regulation from 2.3V input, critical for single Li-ion (2.7–4.2V) or dual alkaline (3.0–3.6V) operation. |
| Quiescent Current | 1.5µA @ no load - extends battery life in always-on metering and weighing scale standby modes. |
| Current Limit | 200mA min - provides robust short-circuit protection while allowing full 150mA continuous output per spec at 1.8V. |
| Thermal Shutdown | 160°C activation with 20°C hysteresis - prevents latch-up during transient overload or poor PCB heatsinking in compact enclosures. |
| ESD Rating | HBM 6000V - enhances reliability during board assembly and field handling without additional protection circuitry. |
Pinout & Package
SOT25 (WW) package: 5-pin surface-mount with exposed pad not electrically connected; footprint compatible with JEDEC MO-203AA; thermal resistance θJA = 155°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V; requires ≥1µF ceramic input capacitor for stability. |
| 2 | GND | Analog ground reference; must be low-impedance connection to minimize noise coupling into error amplifier. |
| 3 | NC | No-connect terminal; left floating per fixed-output configuration; no internal connection or function. |
| 4 | VOUT | Regulated 1.8V output; requires ≥1µF ceramic output capacitor with ESR <100mΩ for transient response and stability. |
| 5 | NC | No-connect terminal; electrically isolated; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.2–18V) | Eliminates need for upstream buck converter in industrial handhelds powered by variable battery or adapter sources. |
| Reverse current protection | Prevents backfeed from VOUT to VIN when input is removed - essential for battery backup circuits and hot-swap applications. |
| Ultra-low IQ (1.5µA) | Reduces standby power loss to <2.7nW/V, enabling >1-year battery life in low-duty-cycle sensor nodes. |
| Ceramic capacitor compatible | Stable with 1µF X5R/X7R ceramics - avoids cost, size, and reliability penalties of tantalum or electrolytic capacitors. |
| Thermal shutdown + hysteresis | Auto-recovery after cooling prevents system lockup during intermittent overloads in sealed enclosures. |
Applications
| Portable Weighing Scales | Metering Data Loggers |
|---|---|
Use Scenario: Battery-powered digital scales used in retail and lab environments requiring milligram-level resolution and multi-year battery life. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying ADC reference, load-cell signal chain, and low-power MCU core. Use Value: 1.5µA quiescent current minimizes self-discharge; ±1% accuracy maintains ADC full-scale calibration across temperature. |
Use Scenario: Utility meter data loggers operating on primary lithium batteries in remote locations with infrequent readouts. IC Role / Device Role / Timing Role: Regulator for real-time clock (RTC), memory retention, and sensor interface circuitry during deep sleep. Use Value: Reverse current protection prevents battery drain when main supply is disconnected; 18V tolerance accommodates surge-prone AC/DC adapters. |
| USB-Powered Test Instruments | Industrial Handheld Terminals |
Use Scenario: Portable oscilloscope probes and signal generators drawing power directly from USB 2.0/3.0 ports (4.75–5.25V). IC Role / Device Role / Timing Role: Step-down LDO generating clean 1.8V for FPGA I/O banks and analog front-end biasing. Use Value: 500mV dropout ensures regulation even as USB voltage sags under load; low noise preserves signal integrity. |
Use Scenario: Ruggedized barcode scanners and RFID readers deployed in warehouses with mixed 5V/12V power sources and wide ambient temperature swings. IC Role / Device Role / Timing Role: Secondary regulator powering display driver ICs and touch controller from main 3.3V or 5V rail. Use Value: 155°C/W θJA enables operation at +70°C ambient without heatsink; ±100ppm/°C tempco maintains display contrast stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-18W5-7 | Successor device with same 1.8V output but improved 300mA guaranteed current limit (vs 200mA min), lower 350mV dropout, and enhanced PSRR. | Required for designs needing full 300mA continuous output or tighter ripple rejection in noise-sensitive analog sections. | Select AP7375-18W5-7 for new designs; AP7370-18WW-7 remains viable for legacy replacements where 200mA margin suffices. |
| MCP1703T-1802E/MB | Microchip 1.8V LDO with 250mA rating, 600mV dropout, and 2.5µA IQ - lacks reverse current protection and has wider ±2% accuracy. | Suitable for cost-sensitive consumer electronics where reverse blocking is handled externally and ±2% tolerance is acceptable. | Choose only if AP7370-18WW-7's reverse protection and ±1% accuracy are not required; verify thermal performance with θJA = 200°C/W. |
Compared with AP7375-18W5-7, the AP7370-18WW-7 offers proven field reliability but lower current guarantee and higher dropout; versus MCP1703T-1802E/MB, it delivers superior accuracy and integrated reverse blocking at slightly higher IQ - making it optimal for precision battery-powered instrumentation.
Availability
AP7370-18WW-7 is available at Aetrix Electronics and suitable for portable weighing scales, USB-powered test instruments, and industrial handheld terminals requiring stable component supply with long-term lifecycle support.
Supply support for AP7370-18WW-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-voltage ULDO regulator product line, engineered specifically for battery-powered and USB-connected devices demanding wide input range, ultra-low IQ, and robust protection features.
FAQ
Is AP7370-18WW-7 recommended for new designs?
No - Diodes Incorporated explicitly marks AP7370-18WW-7 as "NOT RECOMMENDED FOR NEW DESIGN" in its datasheet. The AP7375-18W5-7 is the designated successor with improved current limit, lower dropout, and enhanced PSRR. For new projects, engineers should migrate to AP7375; AP7370 remains supported for existing production and legacy replacement.
What is the minimum input voltage required for regulation at 1.8V output?
The AP7370-18WW-7 requires VIN ≥ 3.2V for guaranteed operation per Recommended Operating Conditions. With 500mV dropout at 100mA, it regulates down to VIN = 2.3V, but the datasheet specifies 3.2V as the absolute minimum for full parameter compliance across temperature and process variation.
Can AP7370-18WW-7 drive a 150mA load continuously?
Yes - the datasheet guarantees 150mA continuous output for VOUT ≤ 2.5V (including 1.8V) under TJ ≤ +125°C, with thermal shutdown activating at 160°C. At 150mA, power dissipation is ~165mW in SOT25 (θJA = 155°C/W), resulting in ~26°C rise above ambient - well within safe operating limits.
Does AP7370-18WW-7 require an external enable signal?
No - the AP7370-18WW-7 has no enable pin and operates continuously when VIN is applied. It lacks active shutdown control; power sequencing must be managed externally via VIN rail switching. This simplifies design but eliminates software-controlled power gating.
AP7370-18WW-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):
- 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-25
AP7370-18WW-7 FAQ
1.How can I place an order for AP7370-18WW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-18WW-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 AP7370-18WW-7 reliable?
The price and inventory of AP7370-18WW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-18WW-7 is usually 5 days.
3.What payment methods are accepted for AP7370-18WW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-18WW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-18WW-7?
AP7370-18WW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-18WW-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 AP7370-18WW-7?
For technical support, including AP7370-18WW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-18WW-7 requirements.
6.How does Aetrix verify that AP7370-18WW-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-18WW-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 AP7370-18WW-7 meets industry standards.
7.What is the process for return or replacement of AP7370-18WW-7?
All AP7370-18WW-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-18WW-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 AP7370-18WW-7 part is unused and in its original packaging.
Return procedure for AP7370-18WW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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