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Diodes Incorporated AP7351D-08FS4-7B
- Part No.:
- AP7351D-08FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7351D-08FS4-7B.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 (T
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
AP7351D-08FS4-7B from Diodes Incorporated is a fixed 0.8V, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package with enable control, ±1% output voltage accuracy at +25°C, and 0.5µA typical quiescent current-designed for power management in wearable electronics and IoT sensor modules.
For engineers reviewing the AP7351D-08FS4-7B datasheet, AP7351D-08FS4-7B pinout, AP7351D-08FS4-7B application, or AP7351D-08FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (0.9V typ), active output discharge function, thermal shutdown threshold (+160°C), and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-08FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path. Its EN pin provides precise on/off control with 0.4V max low threshold and 1.0V min high threshold, enabling reliable sequencing in battery-powered systems.
It operates across 1.4V to 5.5V input range while maintaining 0.8V output with ±1% accuracy at room temperature and ±2% over −40°C to +85°C. PSRR reaches 60dB at 1kHz, and dropout voltage is specified at 0.9V (typ) under 150mA load at VOUT = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.8V - enables direct powering of ultra-low-voltage logic cores and memory interfaces. |
| Max Output Current | 150mA - supports moderate-current peripherals like BLE radios or image sensors without external boost. |
| Quiescent Current | 0.5µA typ - extends battery life in always-on wearables by minimizing standby drain. |
| Output Accuracy | ±1% at +25°C - ensures stable supply for precision analog blocks and ADC references. |
| Dropout Voltage | 0.9V typ @ 150mA - allows operation down to 1.7V input, compatible with single-cell Li-ion or Li-poly after discharge. |
| PSRR | 60dB @ 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-power domains. |
| Enable Threshold | VEN(H) ≥ 1.0V, VEN(L) ≤ 0.4V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
| Thermal Shutdown | +160°C threshold with +20°C hysteresis - prevents latch-up during sustained overload or poor PCB thermal design. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed thermal pad (EP), moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated output node | Delivers stable 0.8V; requires 0.1µF ceramic capacitor placed adjacent to minimize ESR-induced instability. |
| PIN2 (GND) | Power ground reference | Must connect directly to low-impedance ground plane; shared return path for VIN, VOUT, and EP improves thermal and noise performance. |
| PIN3 (EN) | Active-high enable input | Drives regulator ON when ≥1.0V; pulls VOUT to GND via internal discharge FET when low - eliminates residual voltage on powered-down rails. |
| PIN4 (VIN) | Input power supply | Accepts 1.4–5.5V; requires local 0.1µF decoupling capacitor between PIN4 and PIN2 to suppress supply transients. |
| EP (Exposed Pad) | Thermal and electrical ground | Not electrically functional as signal node; must be soldered to large copper area tied to GND for θJA = 237°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.5µA typical - reduces battery leakage to <1µA in deep-sleep states, critical for multi-year wearable deployments. |
| Active output discharge | 35Ω typical discharge resistance - clears VOUT within microseconds after EN deactivation, preventing back-powering of upstream circuits. |
| Wide input voltage range | 1.4V to 5.5V - supports direct connection to single-cell Li-ion (2.5–4.2V), coin cells (1.5–3.0V), or post-regulated 3.3V/5V rails. |
| High PSRR at low frequency | 60dB @ 1kHz - rejects ripple from switching regulators feeding the same system, preserving analog signal integrity. |
| Stable with minimal capacitance | 0.1µF ceramic CIN/COUT - eliminates need for bulk electrolytics, reducing board area and cost in space-constrained wearables. |
| Robust protection suite | Current limit (60mA short-circuit), thermal shutdown (+160°C), and ESD rating (>2kV HBM) - enhances field reliability without external protection components. |
Applications
| Wearable Fitness Tracker | IoT Environmental Sensor Node |
|---|---|
|
Use Scenario: Continuous heart-rate monitoring using optical sensor and ARM Cortex-M0+ MCU in wrist-worn form factor. IC Role / Device Role / Timing Role: Primary 0.8V supply for MCU core and sensor interface, enabled only during measurement bursts. Use Value: 0.5µA quiescent current extends coin-cell lifetime beyond 12 months; active discharge prevents sensor bias leakage during sleep. |
Use Scenario: Battery-powered soil moisture and temperature node transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Regulated 0.8V rail for ultra-low-power microcontroller and analog front-end during active sensing. Use Value: 1.4V minimum VIN allows operation down to end-of-life alkaline cell voltage (~1.5V); 60dB PSRR isolates RF transceiver noise from ADC readings. |
| Smart Hearing Aid Processor | Miniature Camera Module |
|
Use Scenario: Dual-core DSP and MEMS microphone preamp in hearing aid requiring sub-100µA average current. IC Role / Device Role / Timing Role: Core voltage regulator for DSP subsystem, sequenced via host processor's GPIO. Use Value: ±1% output accuracy maintains consistent digital gain calibration; 0.9V dropout enables use with 1.8V battery stack. |
Use Scenario: 1MP CMOS image sensor in compact security camera with motion-triggered capture. IC Role / Device Role / Timing Role: Dedicated 0.8V supply for sensor digital core and interface logic, activated only during frame readout. Use Value: Active discharge ensures clean power-down between frames, eliminating ghosting artifacts caused by residual VOUT coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-0802E/TT | No active output discharge; 1.6µA quiescent current; SOT23-5 package | Lacks fast VOUT discharge - unsuitable where back-powering must be avoided | Choose if board space permits larger SOT23-5 and discharge is not required |
| TPS7A0218PDQNR | 0.35µA quiescent current; 0.8V fixed output; WSON-6 package; no integrated discharge FET | Lower IQ but requires external discharge circuit for equivalent functionality | Prefer when ultra-low IQ dominates design priority and layout allows discrete discharge solution |
Compared with MCP1700T-0802E/TT and TPS7A0218PDQNR, the AP7351D-08FS4-7B uniquely combines sub-µA quiescent current, integrated active discharge, and 1.0mm² footprint-enabling simpler, smaller, and more robust power sequencing in miniaturized battery systems.
Availability
AP7351D-08FS4-7B is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, smart hearing aids, and miniature camera modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for AP7351D-08FS4-7B 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 AP7351D belongs to Diodes' ultra-low-IQ LDO family, engineered specifically for extended-battery-life portable and wearable devices where standby current, small footprint, and integrated protection are critical.
FAQ
What is the minimum input voltage required for AP7351D-08FS4-7B to regulate 0.8V output?
The AP7351D-08FS4-7B requires a minimum input voltage of 1.4V to maintain regulation. At 150mA load, its typical dropout is 0.9V, meaning it sustains 0.8V output down to ~1.7V input. Below 1.4V, the device enters undervoltage lockout and ceases regulation.
Does AP7351D-08FS4-7B require an external pull-up resistor on the EN pin?
No external pull-up is required. The EN pin has no internal pull-up; however, it must never be left floating. For always-on operation, tie EN directly to VIN. For controlled enable/disable, drive it actively to ≥1.0V (ON) or ≤0.4V (OFF) using a GPIO or open-drain driver.
Can AP7351D-08FS4-7B be used with tantalum output capacitors?
While the device is optimized for 0.1µF ceramic capacitors (X5R/X7R), tantalum capacitors may be used if ESR falls within the stable region shown in Figure 15 of DS42111 Rev. 4–2. However, ceramic is strongly recommended due to lower ESR, better temperature stability, and absence of failure modes like surge current damage.
Is the exposed pad (EP) of AP7351D-08FS4-7B electrically connected to GND internally?
No-the exposed pad is not internally connected to any circuit node. It serves solely as a thermal conduction path. Diodes recommends connecting it to a large GND copper area on the PCB for optimal thermal dissipation, but it must not be used as the sole GND connection for the device.
AP7351D-08FS4-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- 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):
- 0.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 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:
- X2-DFN1010-4 (Type B)
AP7351D-08FS4-7B FAQ
1.How can I place an order for AP7351D-08FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-08FS4-7B 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-08FS4-7B reliable?
The price and inventory of AP7351D-08FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-08FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7351D-08FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-08FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-08FS4-7B?
AP7351D-08FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-08FS4-7B 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-08FS4-7B?
For technical support, including AP7351D-08FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-08FS4-7B requirements.
6.How does Aetrix verify that AP7351D-08FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7351D-08FS4-7B 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-08FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7351D-08FS4-7B?
All AP7351D-08FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-08FS4-7B, 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-08FS4-7B part is unused and in its original packaging.
Return procedure for AP7351D-08FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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