My Inquiry
My Account
Diodes Incorporated AP7370-18WR-7
- Part No.:
- AP7370-18WR-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-18WR-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP7370-18WR-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 power management in portable instrumentation and battery-powered USB devices.
For engineers reviewing the AP7370-18WR-7 datasheet, AP7370-18WR-7 pinout, AP7370-18WR-7 application, or AP7370-18WR-7 equivalent, key selection criteria include input voltage headroom (≥3.2V), thermal resistance (155°C/W in SOT25), load regulation (±0.5%), and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The AP7370-18WR-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, current-limit circuit (200mA min for VOUT ≤2.5V), chip enable logic, and thermal shutdown at +160°C with +20°C hysteresis. Its architecture supports stable operation with 1.0µF input/output ceramic capacitors.
It delivers regulated 1.8V output across -40°C to +125°C junction temperature, maintains ±100ppm/°C temperature coefficient, and blocks reverse current during shutdown - critical for multi-rail systems where output may exceed input during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±1% (ensures stable core voltage for 1.8V logic rails) |
| Max Input Voltage | 18V (supports wide-input industrial and automotive-supply interfaces) |
| Dropout Voltage | 500mV @ 100mA (enables regulation down to VIN = 2.3V for 1.8V output) |
| Quiescent Current | 1.5µA (minimizes standby power loss in battery-critical applications) |
| Current Limit | 200mA min (protects against short-circuit while sustaining 150mA continuous load) |
| Line Regulation | 0.05%/V (maintains tight output stability across full 3.2–18V input range) |
| Thermal Shutdown | +160°C with +20°C hysteresis (prevents latch-up during transient overloads) |
Pinout & Package
SOT25 (WR) package: 5-pin surface-mount, RoHS-compliant, 2.8mm × 2.9mm footprint, 155°C/W thermal resistance (Junction-to-Ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection (accepts 3.2–18V); requires local 1µF ceramic decoupling |
| 2 | GND | Analog ground reference for regulator feedback and error amplifier |
| 3 | NC | No-connect pin (not internally bonded; must be left floating or grounded per layout guidelines) |
| 4 | VOUT | Regulated 1.8V output; drives load up to 150mA with <0.5% load regulation |
| 5 | NC | No-connect pin (not internally bonded; must be left floating or grounded per layout guidelines) |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range | Supports single-supply operation from 3.2V to 18V - eliminates need for pre-regulation in 12V or USB PD-derived rails |
| Reverse Current Protection | Blocks >1µA reverse current when VOUT > VIN - prevents backfeeding in multi-source power systems |
| Ultra-Low IQ | 1.5µA ground current at zero load - extends battery life in always-on sensor nodes |
| Ceramic Cap Compatible | Stable with 1.0µF X5R/X7R ceramic capacitors - reduces BOM count and PCB area vs. tantalum alternatives |
| Thermal Shutdown | Auto-recovery hysteresis ensures safe restart after cooling - avoids manual reset in enclosed enclosures |
Applications
| Portable Weighing Scales | Metering Data Loggers |
|---|---|
Use Scenario: Battery-powered handheld scale with 24-bit ADC and LCD display operating intermittently for 6+ months on two AA cells. IC Role / Device Role / Timing Role: Primary 1.8V supply for ADC reference and microcontroller I/O domain. Use Value: 1.5µA quiescent current minimizes self-discharge; ±1% accuracy ensures repeatable weight measurement across temperature. | Use Scenario: Industrial energy meter with isolated RS-485 interface, real-time clock, and flash memory, powered by Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: Low-noise 1.8V rail for RTC and EEPROM interface, decoupled from noisy MCU domain. Use Value: Reverse current protection prevents RTC backup battery discharge when main supply is absent. |
| Laptop Subsystem Sensors | USB-Powered Test Instruments |
Use Scenario: Embedded temperature/humidity sensor module inside laptop chassis, powered only when system is awake. IC Role / Device Role / Timing Role: Standby LDO supplying 1.8V to I²C sensor and wake-up comparator. Use Value: 500mV dropout enables regulation from 2.3V battery residual voltage, extending usable battery range. | Use Scenario: Portable oscilloscope probe interface powered via USB 5V bus, requiring clean 1.8V for FPGA configuration and ADC bias. IC Role / Device Role / Timing Role: Post-regulator converting USB 5V to low-noise 1.8V for analog front-end. Use Value: 0.05%/V line regulation rejects USB port voltage ripple; thermal shutdown protects during probe short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-18W5-7 | Successor device with same 1.8V output, lower 300mV dropout at 100mA, and improved ±0.5% accuracy | Designed for new designs; supports higher load currents (300mA continuous) and tighter tolerance-critical rails | Select for new designs requiring extended VIN–VOUT headroom margin or enhanced accuracy |
| MCP1700T-1802E/TT | 1.8V, 250mA LDO with 6µA IQ and 1.6V min VIN; lacks reverse current protection and thermal hysteresis | Targeted at ultra-low-power sub-µA sleep modes but unsuitable for 12–18V input or reverse-bias scenarios | Choose only if input voltage never exceeds 6V and reverse current blocking is not required |
Compared with AP7370-18WR-7, AP7375-18W5-7 offers superior dropout and accuracy for new designs, while MCP1700T-1802E/TT trades off input voltage range and protection features for lower quiescent current - making AP7370-18WR-7 optimal for legacy-compatible 12–18V portable instrumentation where robustness outweighs marginal IQ savings.
Availability
AP7370-18WR-7 is available at Aetrix Electronics and suitable for portable weighing scales, USB-powered test instruments, battery-backed metering loggers, and laptop subsystem sensors requiring stable component supply under industrial temperature and long-lifecycle conditions.
Supply support for AP7370-18WR-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, with design centers in Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.
The AP7370 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial equipment needing robust reverse-current blocking, ultra-low IQ, and ceramic-capacitor stability without external compensation.
FAQ
What is the minimum input voltage required for AP7370-18WR-7 to regulate 1.8V output?
The AP7370-18WR-7 requires a minimum input voltage of 3.2V to maintain regulation, as specified in Recommended Operating Conditions. Below this, the internal reference and error amplifier cannot sustain stable 1.8V output - even though dropout voltage is 500mV at 100mA, the device mandates ≥3.2V VIN for guaranteed performance across temperature and load.
Can AP7370-18WR-7 be used with 10µF tantalum output capacitors?
No - the AP7370-18WR-7 is optimized for low-ESR ceramic capacitors (1.0µF typical) and may become unstable with high-ESR tantalum types. The datasheet explicitly states "Compatible with Low ESR Ceramic Capacitor" and does not characterize or guarantee stability with tantalum or aluminum electrolytic capacitors due to phase-margin risks.
Does AP7370-18WR-7 have an enable pin?
No - the AP7370-18WR-7 has no dedicated enable (EN) pin. It operates continuously when VIN is within specification. The SOT25 (WR) variant uses pins 1 (VIN), 2 (GND), 3 (NC), 4 (VOUT), and 5 (NC); no pin is assigned to control on/off sequencing. Power-down must be achieved by removing VIN.
Why is AP7370-18WR-7 marked "Not Recommended for New Design"?
Diodes Incorporated designates AP7370-18WR-7 as "Not Recommended for New Design" because the pin-compatible AP7375-18W5-7 offers improved specifications - including lower dropout (300mV vs. 500mV), tighter output accuracy (±0.5% vs. ±1%), and higher continuous current (300mA vs. 150mA). AP7370 remains fully supported for existing designs and legacy replacements.
AP7370-18WR-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
AP7370-18WR-7 FAQ
1.How can I place an order for AP7370-18WR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-18WR-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 AP7370-18WR-7 reliable?
The price and inventory of AP7370-18WR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-18WR-7 is usually 5 days.
3.What payment methods are accepted for AP7370-18WR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-18WR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-18WR-7?
AP7370-18WR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-18WR-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 AP7370-18WR-7?
For technical support, including AP7370-18WR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-18WR-7 requirements.
6.How does Aetrix verify that AP7370-18WR-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-18WR-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 AP7370-18WR-7 meets industry standards.
7.What is the process for return or replacement of AP7370-18WR-7?
All AP7370-18WR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-18WR-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 AP7370-18WR-7 part is unused and in its original packaging.
Return procedure for AP7370-18WR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP7370-18WR-7 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…
Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …
Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
