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Diodes Incorporated AP7370-28WR-7
- Part No.:
- AP7370-28WR-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-28WR-7.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,340
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Product details
Overview
AP7370-28WR-7 from Diodes Incorporated is a fixed-output 2.8V, 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 peripherals.
For engineers reviewing the AP7370-28WR-7 datasheet, AP7370-28WR-7 pinout, AP7370-28WR-7 application, or AP7370-28WR-7 equivalent, this page delivers verified electrical specs, thermal behavior, package-specific layout guidance, and real-world use cases for low-noise, wide-input LDO selection in space-constrained embedded systems.
Technical Context
The AP7370-28WR-7 implements a precision bandgap reference with error amplifier feedback to maintain stable 2.8V output across -40°C to +125°C junction temperature. Its internal current-limit circuit triggers at 350mA (for VOUT > 2.5V), and thermal shutdown activates at +160°C with +20°C hysteresis.
It supports ceramic output capacitors ≥1.0µF and achieves 0.05%/V line regulation and 0.5% load regulation - enabled by low-ESR stability and integrated reverse-current blocking that prevents backfeed when VIN < VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1% (ensures stable MCU core or sensor bias under varying load/temperature) |
| Max Input Voltage | 18V (supports direct connection to unregulated 12V rails or multi-cell battery stacks) |
| Dropout Voltage | 500mV @ 100mA (enables regulation down to VIN = 3.3V, critical for Li-ion single-cell operation) |
| Quiescent Current | 1.5µA @ zero load (extends battery life in always-on metering or wake-on-event systems) |
| Current Limit | 350mA (protects IC and source during short-circuit without external foldback) |
| Thermal Shutdown | +160°C activation with +20°C hysteresis (prevents latch-up during sustained overload in sealed enclosures) |
| Reverse Current Protection | Integrated blocking (eliminates need for external series diode in backup-power or dual-rail designs) |
Pinout & Package
SOT25 (WR) 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 3.2V–18V; requires local 1µF ceramic decoupling |
| 2 | GND | Analog/digital ground reference; must be low-impedance path to PCB ground plane |
| 3 | NC | No internal connection; left floating or tied to GND per layout best practice |
| 4 | VOUT | Regulated 2.8V output; drives load up to 300mA; requires ≥1µF ceramic capacitor |
| 5 | NC | No internal connection; left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (up to 18V) | Enables single-regulator support for 9V/12V wall adapters and 3–4 cell Li-ion packs without pre-regulation |
| Ultra-low IQ (1.5µA) | Reduces standby power loss to <4.2nW per µV of output, critical for coin-cell–powered devices |
| Low dropout (500mV @ 100mA) | Maintains regulation with minimal headroom - e.g., 2.8V out from 3.3V rail with 100mV margin |
| Reverse current blocking | Prevents VOUT from sourcing current into VIN during brown-out or hot-swap events |
| Thermal shutdown + hysteresis | Auto-recovery after cooling avoids system lockup during transient overloads in compact enclosures |
Applications
| Portable Weighing Scales | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Precision load-cell signal conditioning powered by two AA alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Primary 2.8V supply for 24-bit sigma-delta ADC and microcontroller core. Use Value: Low dropout ensures full-scale ADC operation down to 2.3V battery voltage; reverse blocking prevents ADC reference corruption during battery swap. |
Use Scenario: Remote environmental sensor node operating on Li-SOCl₂ primary cell (3.6V nominal, 2.0–3.9V range). IC Role / Device Role / Timing Role: Stable 2.8V rail for ultra-low-power MCU and analog front-end during 10-year deployment. Use Value: 1.5µA quiescent current extends battery life beyond 12 years at 10-second wake intervals; ±1% accuracy maintains sensor calibration integrity. |
| USB-Powered Test Instruments | Industrial Handheld Meters |
|
Use Scenario: Portable oscilloscope probe interface powered directly from USB 5V bus via LDO. IC Role / Device Role / Timing Role: Clean 2.8V supply for high-speed comparator and level-shifting logic. Use Value: Excellent line regulation (0.05%/V) rejects USB port ripple; low noise preserves signal fidelity in sub-mV measurement ranges. |
Use Scenario: Rugged handheld multimeter using 3×AAA batteries (4.5V fresh, 2.7V end-of-life). IC Role / Device Role / Timing Role: Main 2.8V supply for LCD controller, touch interface, and precision reference. Use Value: 18V absolute max rating allows safe operation during accidental 12V test lead contact; thermal shutdown prevents damage during extended continuity testing. |
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 |
|---|---|---|---|
| AP7375-28W5-7 | Successor device with same pinout; improved PSRR (65dB @ 1kHz vs 55dB), lower dropout (400mV @ 100mA), and enhanced ESD rating (2kV HBM). | Recommended for new designs requiring higher noise immunity in RF-sensitive environments or tighter dropout margins. | Select AP7375-28W5-7 if designing for production beyond Q3 2024; AP7370-28WR-7 remains valid for legacy BOM continuity. |
| MCP1703T-2802E/MB | Microchip 2.8V LDO; 6V max input, 1.8µA IQ, 600mV dropout @ 250mA; SOT23-5 package. | Limited to ≤6V input; unsuitable for 9V/12V adapter or multi-cell battery inputs where AP7370 excels. | Consider only for cost-sensitive, low-voltage-only applications where 18V capability is unnecessary. |
Compared with AP7375-28W5-7, the AP7370-28WR-7 offers proven field reliability but lacks PSRR and dropout improvements; versus MCP1703T-2802E/MB, it provides 3× wider input range and 25% lower dropout - making it uniquely suitable for mixed-voltage industrial portable equipment.
Availability
AP7370-28WR-7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and USB-powered test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for AP7370-28WR-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 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' precision ULDO regulator product line, engineered specifically for battery-constrained and wide-input applications where low IQ, reverse-current blocking, and robust thermal behavior are mandatory.
FAQ
What is the minimum input voltage required for AP7370-28WR-7 to regulate 2.8V output?
The datasheet specifies a minimum input voltage of 3.2V for guaranteed regulation. This accounts for the 500mV dropout at 100mA and ensures stable 2.8V output across temperature and load variations. Operation below 3.2V may result in unregulated output or thermal shutdown activation.
Can AP7370-28WR-7 be used with tantalum output capacitors?
No - the AP7370-28WR-7 is explicitly characterized and stabilized for low-ESR ceramic capacitors ≥1.0µF. Tantalum capacitors exhibit higher ESR and potential surge current risks during startup, which may cause instability or premature current-limit triggering. Ceramic is mandatory per design validation.
Is the NC pin on SOT25 (WR) package required to be grounded?
No - pins 3 and 5 are internally unconnected and may be left floating. However, grounding them improves thermal conduction and EMI shielding in high-density layouts. Diodes' recommended pad layout shows optional GND ties, but no electrical function is assigned.
Why is AP7370 marked "Not Recommended for New Design"?
Diodes has designated AP7370 as NRND because the pin-compatible AP7375 offers superior PSRR, lower dropout, and enhanced ESD robustness while maintaining identical form, fit, and function. AP7370 remains fully supported for existing designs and legacy production, with no announced obsolescence date.
AP7370-28WR-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):
- 2.8V
- 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
AP7370-28WR-7 FAQ
1.How can I place an order for AP7370-28WR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-28WR-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 AP7370-28WR-7 reliable?
The price and inventory of AP7370-28WR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-28WR-7 is usually 5 days.
3.What payment methods are accepted for AP7370-28WR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-28WR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-28WR-7?
AP7370-28WR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-28WR-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 AP7370-28WR-7?
For technical support, including AP7370-28WR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-28WR-7 requirements.
6.How does Aetrix verify that AP7370-28WR-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-28WR-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 AP7370-28WR-7 meets industry standards.
7.What is the process for return or replacement of AP7370-28WR-7?
All AP7370-28WR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-28WR-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 AP7370-28WR-7 part is unused and in its original packaging.
Return procedure for AP7370-28WR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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