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Diodes Incorporated AP7370-18W5-7
- Part No.:
- AP7370-18W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-18W5-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:7,641
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Product details
Overview
AP7370-18W5-7 from Diodes Incorporated is a fixed-output 1.8V, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, and reverse current protection - designed for power rail regulation in portable instrumentation and battery-powered USB peripherals.
For engineers reviewing the AP7370-18W5-7 datasheet, AP7370-18W5-7 pinout, AP7370-18W5-7 application, or AP7370-18W5-7 equivalent, this page delivers verified electrical specs, thermal behavior, real-world load transient response, and validated alternative options for low-noise, wide-input LDO selection.
Technical Context
The AP7370-18W5-7 integrates a precision voltage reference, error amplifier, and current-limit circuit to maintain stable 1.8V output across 3.2–18V input range and −40°C to +125°C junction temperature. Its internal architecture enables operation with low-ESR ceramic capacitors and provides reverse current blocking without external components.
Thermal shutdown activates at +160°C with +20°C hysteresis, and the device sustains 300mA continuous output while maintaining <0.5% load regulation over its rated current range. Dropout voltage remains ≤600mV up to 100mA load for VOUT ≥ 2.8V; for 1.8V output, dropout is specified under adjusted test conditions per datasheet Note 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% (±2% for VOUT ≤ 2.5V), enabling direct powering of 1.8V logic rails without external feedback. |
| Input Voltage Range | 3.2V to 18V - supports single-cell LiFePO₄, multi-cell alkaline/NiMH, and industrial 12V supply derating. |
| Max Output Current | 300mA continuous - sufficient for microcontrollers, sensors, and RF transceivers in space-constrained designs. |
| Dropout Voltage | 500mV @ 100mA (typ), allowing regulation from 2.3V input to 1.8V output - critical for battery end-of-life operation. |
| Quiescent Current | 1.5µA (typ) at zero load - extends battery life in always-on monitoring systems like weighing scales. |
| Line Regulation | 0.05%/V - ensures <±0.9mV output shift over full 3.2–18V input range, reducing need for post-regulation filtering. |
| Thermal Shutdown | Triggers at +160°C with +20°C hysteresis - protects PCB traces and adjacent components during sustained overload. |
Pinout & Package
SOT25 (W5) package: 5-pin surface-mount, thermally enhanced plastic body (3.0mm × 2.8mm × 1.3mm), with exposed pad not electrically connected. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pins 4–5 = NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply terminal - accepts up to 18V DC; requires local 1µF ceramic decoupling. |
| 2 | GND | Power ground reference - must be low-impedance connection to minimize noise coupling into error amplifier. |
| 3 | VOUT | Regulated 1.8V output - drives load directly; stability guaranteed with ≥1µF ceramic capacitor. |
| 4, 5 | NC | No internal connection - left floating or tied to GND per layout best practice; no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (up to 18V) | Enables single-LDO solution across diverse input sources - eliminates need for pre-regulator stages in multi-battery systems. |
| Reverse Current Protection | Blocks backfeed from VOUT to VIN when input is absent - prevents battery drain in hot-swap or dual-supply configurations. |
| Ultra-Low IQ (1.5µA typ) | Reduces standby power loss by >95% vs. standard LDOs - critical for coin-cell–powered metering devices with 10-year lifetime targets. |
| Low ESR Capacitor Compatible | Stable with 1µF ceramic output cap - avoids costly tantalum or polymer capacitors and simplifies BOM. |
| Thermal & Short-Circuit Protection | Self-limiting behavior under fault conditions - allows safe operation in unattended embedded deployments without external supervision. |
Applications
| Portable Weighing Scales | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Precision load-cell signal conditioning powered by two AA batteries (1.8–3.2V range) with long-term field deployment. IC Role / Device Role / Timing Role: Primary 1.8V supply for 24-bit delta-sigma ADC and low-power MCU core domain. Use Value: Ultra-low quiescent current extends battery life beyond 5 years; reverse current protection prevents discharge when USB charging is active. |
Use Scenario: Environmental sensor node operating on lithium-thionyl chloride primary cell (3.6V nominal, down to 2.0V). IC Role / Device Role / Timing Role: Stable 1.8V rail for ultra-low-power microcontroller and digital humidity/temperature sensor interface. Use Value: 500mV dropout allows full utilization of battery capacity down to 2.3V; ±1% accuracy ensures consistent ADC reference scaling. |
| Industrial Handheld Meters | USB-Powered Test Probes |
Use Scenario: Rugged handheld multimeter with auto-ranging analog front-end and segmented LCD display. IC Role / Device Role / Timing Role: Clean 1.8V supply for precision op-amps and SAR ADC driver stage. Use Value: Excellent line regulation (0.05%/V) rejects ripple from switching charge pumps; thermal shutdown prevents damage during probe short-circuit events. |
Use Scenario: USB 2.0–powered oscilloscope probe with integrated signal conditioning and FPGA-based digitizer. IC Role / Device Role / Timing Role: Post-regulator for FPGA I/O bank and high-speed comparator biasing. Use Value: Wide 3.2–18V input accommodates USB PD negotiation and legacy 5V adapters; low noise preserves signal integrity in 12-bit acquisition paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT (Microchip) | 250mA max output, 6µA IQ, 6V max input - lower current and narrower input range. | Limited to single-cell Li-ion or 5V USB-only systems; insufficient for 12V industrial inputs. | Select only if system input never exceeds 6V and load current stays below 250mA. |
| TPS7A2018PDQNR (TI) | 300mA, 0.65µA IQ, 6V max input, 1.8V fixed - superior IQ but incompatible with >6V supplies. | Requires upstream buck converter for 12V/18V inputs; adds cost and board area. | Prefer for ultra-low-power battery-only designs where input is strictly ≤6V. |
Compared with AP7370-18W5-7, MCP1700T-1802E/TT and TPS7A2018PDQNR offer lower quiescent current but sacrifice wide-input capability - making AP7370-18W5-7 uniquely suitable for direct regulation from unregulated 12V/18V rails without additional conversion stages.
Availability
AP7370-18W5-7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial handheld meters requiring stable component supply with long-lifecycle support.
Supply support for AP7370-18W5-7 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 for power management, signal integrity, and connectivity applications.
The AP7370 series belongs to Diodes' high-voltage LDO portfolio, engineered specifically for USB-powered peripherals, portable test equipment, and industrial sensors needing robust regulation across wide input ranges without external complexity.
FAQ
Is AP7370-18W5-7 recommended for new designs?
No - Diodes explicitly marks AP7370 as "NOT RECOMMENDED FOR NEW DESIGN" and recommends AP7375 as its replacement. AP7370-18W5-7 remains available for legacy support and existing production, but new designs should evaluate AP7375 for improved specifications and long-term supply assurance.
What is the thermal performance of AP7370-18W5-7 in SOT25 package?
In SOT25 (W5) package, AP7370-18W5-7 has θJA = 155°C/W and θJC = 23°C/W. At 300mA load and 18V input, power dissipation reaches ~4.6W; ambient temperature must stay below +75°C with adequate copper pour to avoid thermal shutdown activation.
Can AP7370-18W5-7 be used with ceramic capacitors smaller than 1µF?
No - datasheet specifies minimum 1.0µF ceramic capacitor on both input and output for stability. Using smaller values risks oscillation or poor transient response, especially under fast load steps. X5R/X7R dielectrics with Z5U tolerance are acceptable if rated ≥6.3V.
Does AP7370-18W5-7 require an enable pin for power sequencing?
No - AP7370-18W5-7 has no enable (EN) pin. It operates continuously when VIN is within specification. For sequencing control, external MOSFET gating of VIN or use of AP7375 (which includes EN) is required.
AP7370-18W5-7 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
AP7370-18W5-7 FAQ
1.How can I place an order for AP7370-18W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-18W5-7 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 AP7370-18W5-7 reliable?
The price and inventory of AP7370-18W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-18W5-7 is usually 5 days.
3.What payment methods are accepted for AP7370-18W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-18W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-18W5-7?
AP7370-18W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-18W5-7 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 AP7370-18W5-7?
For technical support, including AP7370-18W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-18W5-7 requirements.
6.How does Aetrix verify that AP7370-18W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-18W5-7 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 AP7370-18W5-7 meets industry standards.
7.What is the process for return or replacement of AP7370-18W5-7?
All AP7370-18W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-18W5-7, 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 AP7370-18W5-7 part is unused and in its original packaging.
Return procedure for AP7370-18W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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