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Diodes Incorporated AP7351D-28W5-7
- Part No.:
- AP7351D-28W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7351D-28W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP7351D-28W5-7 from Diodes Incorporated is a fixed 2.8V, 150mA ultra-low quiescent current LDO regulator in SOT25 package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and enable-controlled shutdown. It operates from 1.4V to 5.5V input, delivers 2.8V at up to 150mA, and is optimized for battery-powered wearable electronics and IoT sensor modules requiring extended runtime.
For engineers reviewing the AP7351D-28W5-7 datasheet, AP7351D-28W5-7 pinout, AP7351D-28W5-7 application, or AP7351D-28W5-7 equivalent, key selection criteria include dropout voltage at 150mA (0.19V typ), standby current (0.02µA), PSRR (60dB @ 1kHz), thermal shutdown threshold (+160°C), and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-28W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge. Its internal resistor network sets the fixed 2.8V output, eliminating external feedback components.
Enable control is implemented via a dedicated EN pin with defined logic thresholds (VIL ≤ 0.4V, VIH ≥ 1.0V), and the device enters ultra-low-power standby mode (<0.2µA) when EN is low. Thermal shutdown activates at +160°C with +20°C hysteresis for robust overtemperature protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1% at +25°C; ±2% over -40°C to +85°C - ensures stable rail for 2.8V microcontrollers and sensors. |
| Max Output Current | 150mA - supports moderate-power peripherals like BLE radios or image sensors without external pass devices. |
| Quiescent Current | 0.5µA typ - enables multi-year battery life in always-on wearables using coin cells or small Li-ion packs. |
| Dropout Voltage | 0.19V typ at 150mA - allows operation down to 2.99V input, critical for single-cell Li-ion (2.8–4.2V) or alkaline systems. |
| PSRR | 60dB @ 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input, improving analog sensor accuracy. |
| Standby Current | 0.02µA typ - minimizes leakage during system sleep, essential for duty-cycled IoT endpoints. |
| Thermal Shutdown | +160°C threshold with +20°C hysteresis - prevents thermal runaway under sustained overload or poor PCB heatsinking. |
Pinout & Package
SOT25 (5-pin, 3.0mm × 2.8mm × 1.3mm) package with exposed pad for thermal enhancement; RoHS-compliant matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 – VOUT | Regulated output node | Delivers stable 2.8V; requires 0.1µF ceramic capacitor placed adjacent to minimize ESR-induced instability. |
| PIN2 – GND | Power ground reference | Primary return path for load current; must connect directly to low-impedance ground plane to avoid regulation error. |
| PIN3 – EN | Enable control input | Active-high logic: >1.0V enables regulator; <0.4V forces shutdown; must not float - tie to VIN if unused. |
| PIN4 – VIN | Input power supply | Accepts 1.4V–5.5V; requires local 0.1µF decoupling capacitor to suppress supply transients and ensure stability. |
| PIN5 – NC | No connection | Internally unconnected; no electrical function - leave unconnected per datasheet guidance for fixed-output versions. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.5µA typical - extends battery life in always-on applications such as fitness trackers and environmental sensors. |
| Active output discharge | 35Ω internal discharge path - rapidly discharges VOUT on shutdown, preventing unintended wake-up or latch-up in downstream circuits. |
| Wide input voltage range | 1.4V to 5.5V - supports direct connection to single-cell Li-ion, LiFePO₄, or multi-cell alkaline batteries without pre-regulation. |
| High PSRR at 1kHz | 60dB - maintains clean 2.8V rail despite noisy DC-DC sources, reducing need for additional filtering in space-constrained designs. |
| Thermal protection with hysteresis | +160°C trip / +140°C recovery - prevents thermal cycling damage during transient overloads while enabling automatic recovery. |
Applications
| Wearable Fitness Tracker | IoT Environmental Sensor Node |
|---|---|
|
Use Scenario: Continuous heart-rate monitoring using optical sensor and ultra-low-power MCU in wrist-worn form factor. IC Role / Device Role / Timing Role: Primary 2.8V power rail regulator for sensor analog front-end and BLE radio subsystem. Use Value: 0.5µA quiescent current enables >2-year battery life on CR2032; 0.19V dropout permits full utilization of declining Li-ion cell voltage. |
Use Scenario: Battery-powered temperature/humidity sensor transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Stable 2.8V supply for precision ADC, digital sensor interface, and RF transceiver during brief transmit bursts. Use Value: 60dB PSRR rejects switching noise from boost converter powering LoRa module; active discharge prevents residual VOUT from holding MCU in reset. |
| Smart Camera Module | Medical Patch Monitor |
|
Use Scenario: Miniaturized camera for endoscopic or industrial inspection with intermittent image capture. IC Role / Device Role / Timing Role: Dedicated LDO for CMOS image sensor biasing and timing controller, enabled only during capture. Use Value: EN pin enables precise power gating; 0.02µA standby current eliminates leakage during 99% idle time, preserving battery capacity. |
Use Scenario: Disposable ECG patch worn for 72-hour continuous cardiac monitoring. IC Role / Device Role / Timing Role: Regulated 2.8V source for ultra-low-noise instrumentation amplifier and Bluetooth LE SoC. Use Value: ±1% output accuracy ensures consistent ADC reference across temperature; thermal shutdown protects against skin-contact overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-2802E/TO | 250mA max output, 1.6µA quiescent current, no active discharge, TO-92 package | Larger footprint, higher IQ limits battery life in sub-10µA sleep systems | Choose for cost-sensitive, non-space-constrained designs where 1.6µA IQ is acceptable. |
| Torex XC6206P282MR-G | 150mA, 1µA IQ, no EN pin, SOT-23-3 package | Fixed-on operation only; lacks enable control for dynamic power management | Choose when enable functionality is unnecessary and board area is extremely limited (SOT-23-3 vs SOT25). |
Compared with MCP1700-2802E/TO and XC6206P282MR-G, the AP7351D-28W5-7 uniquely combines ultra-low 0.5µA quiescent current, integrated enable, active output discharge, and SOT25's thermal performance - making it optimal for compact, battery-limited systems requiring intelligent power sequencing.
Availability
AP7351D-28W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, medical patches, and smart camera modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AP7351D-28W5-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP7351D belongs to Diodes' ultra-low-IQ LDO family, designed specifically for energy-constrained portable and battery-operated systems where runtime, thermal efficiency, and small footprint are critical.
FAQ
What is the minimum input voltage required for AP7351D-28W5-7 to maintain regulation at full 150mA load?
The minimum input voltage is calculated as VOUT + VDROP = 2.8V + 0.19V = 2.99V (typical). At worst-case conditions (−40°C to +85°C, 150mA), dropout reaches 0.40V, requiring VIN ≥ 3.2V to guarantee regulation. Input below this causes output collapse.
Can AP7351D-28W5-7 be used without an external output capacitor?
No. The datasheet mandates a minimum 0.1µF ceramic output capacitor for stability and transient response. Omitting COUT risks oscillation, poor load step recovery, and potential damage due to voltage overshoot during enable turn-on or load transients.
Is the exposed pad on the SOT25 package electrically connected?
No. The exposed pad in the SOT25 package is thermally conductive but electrically isolated. It should be soldered to a large copper pour connected to GND for improved thermal dissipation, but must not be used as a functional GND terminal - all GND current flows through PIN2.
How does the active output discharge function impact system-level power sequencing?
The 35Ω internal discharge path pulls VOUT to GND within milliseconds after EN goes low, ensuring downstream logic resets cleanly and preventing back-powering of upstream regulators. This eliminates need for external bleed resistors and simplifies power-down sequencing in multi-rail systems.
AP7351D-28W5-7 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP7351D-28W5-7 FAQ
1.How can I place an order for AP7351D-28W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-28W5-7 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 AP7351D-28W5-7 reliable?
The price and inventory of AP7351D-28W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-28W5-7 is usually 5 days.
3.What payment methods are accepted for AP7351D-28W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-28W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-28W5-7?
AP7351D-28W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-28W5-7 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 AP7351D-28W5-7?
For technical support, including AP7351D-28W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-28W5-7 requirements.
6.How does Aetrix verify that AP7351D-28W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7351D-28W5-7 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 AP7351D-28W5-7 meets industry standards.
7.What is the process for return or replacement of AP7351D-28W5-7?
All AP7351D-28W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-28W5-7, 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 AP7351D-28W5-7 part is unused and in its original packaging.
Return procedure for AP7351D-28W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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