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Diodes Incorporated AP7370-28WW-7
- Part No.:
- AP7370-28WW-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-28WW-7.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,331
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Product details
Overview
AP7370-28WW-7 from Diodes Incorporated is a fixed-output 2.8V, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 500mV dropout at 100mA, ±1% output voltage accuracy over load/temperature, and reverse current protection - designed for stable power delivery in battery-powered instrumentation and portable USB devices.
For engineers reviewing the AP7370-28WW-7 datasheet, AP7370-28WW-7 pinout, AP7370-28WW-7 application, or AP7370-28WW-7 equivalent, this page delivers verified electrical specs, thermal behavior, real-world load transient response, package-specific layout guidance, and validated alternative options for industrial and portable design continuity.
Technical Context
The AP7370-28WW-7 integrates a precision voltage reference, error amplifier, and current-limit circuit to regulate output under wide input conditions (3.2V–18V). Its architecture enables stable operation with low-ESR ceramic capacitors and includes thermal shutdown triggered at +160°C with +20°C hysteresis.
It delivers 2.8V output with ±1% initial accuracy and ±100ppm/°C temperature coefficient, maintaining ≤0.5% load regulation across 1mA–150mA while drawing only 1.5–2.5µA quiescent current at zero load - critical for extended battery life in metering and weighing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1% (ensures stable MCU core or sensor bias without external feedback) |
| Max Input Voltage | 18V (supports direct connection to unregulated 12V rails or multi-cell Li-ion stacks) |
| Dropout Voltage | 500mV @ 100mA (enables regulation down to VIN = 3.3V, extending usable battery range) |
| Quiescent Current | 1.5–2.5µA @ IOUT = 0A (minimizes standby power loss in always-on portable instruments) |
| Current Limit | 200mA (protects against short-circuit faults while sustaining 150mA continuous load) |
| Thermal Shutdown | +160°C with +20°C hysteresis (prevents latch-up during sustained overload or poor PCB heatsinking) |
| Reverse Current Protection | Integrated (blocks backfeed from VOUT to VIN when input is absent - essential for multi-rail systems) |
Pinout & Package
SOT25 (WW) package: 5-pin surface-mount, thermally enhanced plastic body (3.0mm × 2.8mm × 1.3mm), with exposed pad not electrically connected - requires solder mask defined thermal pad per Diodes' recommended layout (X2=1.933mm, Y4=4.530mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V; decoupling capacitor must be placed within 3mm |
| 2 | GND | Power ground reference; connects to PCB ground plane for low-noise regulation and thermal dissipation |
| 3 | NC | No internal connection; left floating or tied to GND per layout best practice (no functional impact) |
| 4 | VOUT | Regulated 2.8V output; requires ≥1.0µF ceramic capacitor with ESR <100mΩ for stability |
| 5 | NC | No internal connection; no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.2–18V) | Eliminates need for pre-regulation stages in mixed-voltage systems (e.g., 5V/12V industrial USB hubs) |
| Ultra-low IQ (1.5–2.5µA) | Extends battery runtime beyond 10 years in low-duty-cycle metering applications (e.g., smart water meters) |
| Reverse current blocking | Prevents cross-conduction in redundant power paths - critical for fail-safe portable medical devices |
| Thermal shutdown with hysteresis | Enables automatic recovery after fault clearance without system reset or manual intervention |
| Low-ESR capacitor compatibility | Supports compact 0402/0603 ceramic caps - reduces BOM count and PCB area vs. tantalum alternatives |
Applications
| Portable Weighing Scales | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Precision analog front-end (AFE) and microcontroller power in handheld scales operating from two AA cells (1.8–3.2V) or USB bus (5V). IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying ADC reference, load-cell amplifier, and low-power MCU core. Use Value: ±1% output accuracy ensures consistent weight resolution across battery discharge; 500mV dropout allows full-scale operation until cell voltage drops to 3.3V. |
Use Scenario: Long-term environmental monitoring node powered by coin-cell or Li-SOCl₂ battery with intermittent wireless transmission. IC Role / Device Role / Timing Role: Always-on 2.8V rail for RTC, sensor interface, and wake-up controller during deep-sleep mode. Use Value: 1.5µA quiescent current enables >5-year battery life at 10-second sampling intervals; reverse current protection prevents leakage into depleted backup cells. |
| USB-Powered Test Instruments | Industrial Handheld Meters |
Use Scenario: Portable oscilloscope probe power or multimeter auxiliary rail fed directly from USB 5V source. IC Role / Device Role / Timing Role: Clean, noise-immune 2.8V supply for precision op-amps and reference buffers in signal conditioning path. Use Value: Excellent line regulation (0.05%/V) rejects USB port ripple; thermal shutdown protects against enclosure overheating during extended bench use. |
Use Scenario: Ruggedized handheld meter (e.g., clamp meter, insulation tester) operating from rechargeable Li-ion pack (8.4–12.6V). IC Role / Device Role / Timing Role: Isolated 2.8V domain powering display driver, keypad controller, and communication IC (UART/RS-485 transceiver). Use Value: 18V max input withstands load-dump transients; SOT25 package supports conformal coating for moisture resistance in field environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO 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 extended temp range (−40°C to +125°C vs. +125°C max junction) | Required for new designs targeting automotive-grade reliability or higher noise immunity in RF-sensitive test gear | Select if designing new products - AP7370 is Not Recommended for New Design per Diodes' advisory |
| MCP1703T-2802E/MB | Different package (SOT-23-3); 250mA rating; higher dropout (600mV @ 100mA); no reverse current protection | Suitable only where board space is constrained and reverse blocking is handled externally | Use only for legacy SOT-23 footprint compatibility; verify thermal margin at 150mA continuous load |
Compared with AP7370-28WW-7, AP7375-28W5-7 offers superior noise rejection and thermal robustness for next-gen portable instrumentation, while MCP1703T-2802E/MB trades protection features for minimal footprint - making it viable only in cost-sensitive, low-complexity replacements where reverse current risk is mitigated elsewhere.
Availability
AP7370-28WW-7 is available at Aetrix Electronics and suitable for battery-powered equipment, portable information appliances, and metering applications requiring stable component supply despite its Not Recommended for New Design status - supporting legacy production continuity and repair programs.
Supply support for AP7370-28WW-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, computing, and consumer markets.
The AP7370 series belongs to Diodes' wide-input ULDO regulator product line, engineered specifically for USB-powered and battery-operated instrumentation where precision, ultra-low IQ, and robust fault protection are mandatory.
FAQ
What is the maximum continuous output current for AP7370-28WW-7?
The AP7370-28WW-7 is rated for 300mA maximum output current under recommended operating conditions (TJ ≤ +125°C, VIN ≤ 18V). However, its current limit is specified at 200mA for 2.8V output versions - meaning sustained loads above 200mA will trigger foldback limiting. Derating is required above +85°C ambient due to thermal resistance (θJA = 155°C/W in SOT25).
Can AP7370-28WW-7 be used with ceramic output capacitors smaller than 1.0µF?
No - Diodes specifies a minimum 1.0µF ceramic capacitor (X5R/X7R, ≤100mΩ ESR) on VOUT for stability across all operating conditions. Using smaller values risks oscillation or poor transient response, especially under load steps from 1mA to 150mA. The device's control loop is optimized for this capacitance, and validation data (Fig. 7–10) confirms stability only with ≥1.0µF.
Does AP7370-28WW-7 require an input capacitor?
Yes - a minimum 1.0µF ceramic capacitor is required on VIN, placed within 3mm of pins 1 and 2. This suppresses high-frequency noise from upstream sources (e.g., switching converters) and maintains loop stability during fast load transients. Omitting it causes overshoot/undershoot exceeding ±5% during 100mA load steps, per Figure 8 in the datasheet.
Is the NC pin on AP7370-28WW-7 electrically isolated or internally tied to GND?
The NC pins (pins 3 and 5 in SOT25 WW) are fully unconnected internally - no bond wire, no metal trace. They may be left floating or tied to GND for mechanical reinforcement or EMI shielding, but doing so has zero electrical effect on regulation, thermal performance, or fault behavior. Diodes' marking diagram and pin description table explicitly state "Not connected for fixed version".
AP7370-28WW-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
AP7370-28WW-7 FAQ
1.How can I place an order for AP7370-28WW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-28WW-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 AP7370-28WW-7 reliable?
The price and inventory of AP7370-28WW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-28WW-7 is usually 5 days.
3.What payment methods are accepted for AP7370-28WW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-28WW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-28WW-7?
AP7370-28WW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-28WW-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 AP7370-28WW-7?
For technical support, including AP7370-28WW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-28WW-7 requirements.
6.How does Aetrix verify that AP7370-28WW-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-28WW-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 AP7370-28WW-7 meets industry standards.
7.What is the process for return or replacement of AP7370-28WW-7?
All AP7370-28WW-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-28WW-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 AP7370-28WW-7 part is unused and in its original packaging.
Return procedure for AP7370-28WW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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