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Diodes Incorporated AP7351D-18FS4-7B
- Part No.:
- AP7351D-18FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7351D-18FS4-7B.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,700
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Product details
Overview
AP7351D-18FS4-7B from Diodes Incorporated is a 1.8V fixed-output, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package with ±1% output accuracy, 0.5µA quiescent current, and enable control. It delivers stable power to low-power wearable sensors and IoT edge nodes where battery life extension is critical.
For engineers reviewing the AP7351D-18FS4-7B datasheet, AP7351D-18FS4-7B pinout, AP7351D-18FS4-7B application, or AP7351D-18FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (0.32V typ), active output discharge, thermal shutdown threshold (+160°C), and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-18FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and enable logic to regulate 1.8V output from 1.4V–5.5V input. Its internal resistor network fixes VOUT, eliminating external feedback components.
It features active output discharge (35Ω typical), thermal shutdown (+160°C) with +20°C hysteresis, and guaranteed operation across –40°C to +85°C ambient. Standby current is 0.02µA when EN is low, enabling deep-sleep power management in battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% at +25°C; ±2% over –40°C to +85°C - ensures stable MCU core or sensor bias under temperature variation. |
| Max Output Current | 150mA - sufficient for BLE SoCs, MEMS sensors, and low-power microcontrollers in compact wearables. |
| Quiescent Current | 0.5µA typ - extends battery life in always-on monitoring applications (e.g., multi-year coin-cell operation). |
| Dropout Voltage | 0.32V typ at 150mA - enables regulation from 2.12V input, supporting single-cell Li-ion or alkaline battery discharge curves. |
| PSRR | 60dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal sensor subsystems. |
| Enable Threshold | VEN(H) ≥ 1.0V, VEN(L) ≤ 0.4V - compatible with 1.8V GPIOs and open-drain logic without level-shifting. |
| Thermal Resistance θJA | 237°C/W (X2-DFN1010-4) - requires minimal PCB copper area for thermal relief in space-constrained modules. |
Pinout & Package
X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.4mm pitch, 4-terminal leadless package with exposed thermal pad. Moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (Top View) | VOUT | Regulated 1.8V output; must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin. |
| PIN2 (Top View) | GND | Analog/digital ground reference; connects to PCB ground plane and exposed thermal pad for thermal and EMI performance. |
| PIN3 (Top View) | EN | Active-high enable; floating state is undefined - must be tied high (VIN) or driven by GPIO to avoid unintended shutdown. |
| PIN4 (Top View) | VIN | Input supply (1.4V–5.5V); requires local 0.1µF ceramic decoupling to minimize PSRR degradation and transient droop. |
| EP (Exposed Pad) | Thermal / GND | Not electrically functional as GND; recommended to connect to large copper pour tied to GND for thermal dissipation only. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.5µA typ - reduces no-load power loss to <1µW, critical for energy-harvesting and long-life battery systems. |
| Active output discharge | 35Ω typical - rapidly discharges VOUT on shutdown, preventing back-powering of upstream circuits or latch-up in multi-rail systems. |
| Wide input voltage range | 1.4V to 5.5V - supports direct connection to single-cell Li-ion (2.7–4.2V), NiMH (0.9–1.4V per cell), or 3.3V/5V rails. |
| High accuracy over temperature | ±2% VOUT tolerance from –40°C to +85°C - eliminates need for post-production calibration in industrial sensor nodes. |
| Low-ESR capacitor compatibility | Stable with 0.1µF X5R/X7R ceramics - enables use of smallest-case MLCCs, reducing board area and cost in miniaturized modules. |
Applications
| Wearable Health Monitor | IoT Environmental Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary power regulator for analog front-end and BLE transceiver, enabling 3+ year battery life. Use Value: 0.5µA quiescent current and 0.32V dropout extend usable battery voltage range down to 2.12V, maximizing capacity utilization. |
Use Scenario: Battery-powered soil moisture and temperature node deployed outdoors for 5+ years. IC Role / Device Role / Timing Role: Stable 1.8V supply for ultra-low-power MCU and capacitive humidity sensor. Use Value: ±1% output accuracy ensures consistent ADC reference and sensor excitation, reducing calibration drift over temperature. |
| Smart Camera Module | Industrial Wireless Transmitter |
|
Use Scenario: Miniature USB-C camera using single-cell Li-ion with sleep/wake cycles. IC Role / Device Role / Timing Role: Power source for image sensor and ISP during active capture; shut down via EN during idle. Use Value: Active output discharge prevents residual charge on VOUT from interfering with sensor reset timing during wake-up. |
Use Scenario: DIN-rail mounted LoRaWAN transmitter operating in –40°C industrial environments. IC Role / Device Role / Timing Role: Regulator for RF transceiver and microcontroller in harsh-temperature deployments. Use Value: Guaranteed –40°C to +85°C operation and thermal shutdown (+160°C) prevent failure during enclosure overheating events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 150mA, 1.8V, 1.6µA IQ, SOT23-5 - higher quiescent current, no output discharge. | Lacks active discharge; less suitable for systems requiring fast VOUT ramp-down or multi-rail sequencing. | Choose if footprint compatibility with legacy SOT23-5 designs is required and discharge is not needed. |
| TPS70618DRVR | 150mA, 1.8V, 1.3µA IQ, WSON-6 - includes reverse-current protection, no discharge, larger package. | No output discharge; 1.3µA IQ limits battery life vs. AP7351D's 0.5µA in ultra-low-duty-cycle applications. | Prefer when reverse-current blocking is mandatory and board space allows 2.0mm × 2.0mm WSON. |
Compared with MCP1700-1802E/TO and TPS70618DRVR, the AP7351D-18FS4-7B provides the lowest quiescent current (0.5µA) and integrated output discharge in the smallest footprint (1.0mm × 1.0mm), making it optimal for space- and energy-constrained edge devices.
Availability
AP7351D-18FS4-7B is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and wireless communication modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP7351D-18FS4-7B 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 manufacturer specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and connectivity solutions.
The AP7351D belongs to Diodes' ultra-low-IQ LDO family, designed specifically for battery-powered portable and industrial edge devices demanding extended runtime and reliable low-voltage regulation.
FAQ
What is the minimum input voltage required for AP7351D-18FS4-7B to maintain regulation at 150mA?
The minimum input voltage is calculated as VOUT + dropout = 1.8V + 0.32V = 2.12V (typical). At worst-case 0.58V dropout (per datasheet), VIN must be ≥2.38V to sustain 150mA output at 1.8V. Below this, output voltage drops nonlinearly.
Can the EN pin be left unconnected or tied to GND for permanent disable?
No - the EN pin must never be left floating. To permanently enable, tie EN directly to VIN. To permanently disable, drive EN to GND with a solid low-impedance connection; pulling EN to GND achieves 0.02µA standby current, but floating EN risks erratic enable/disable behavior.
Is the exposed pad (EP) electrically connected to GND internally?
No - the exposed pad is thermally conductive only and has no internal electrical connection. It must be soldered to a PCB copper area tied to GND solely for thermal dissipation; using it as a functional GND path violates the device's electrical isolation design.
Does AP7351D-18FS4-7B require an output capacitor, and what type is recommended?
Yes - a minimum 0.1µF X5R or X7R ceramic capacitor is required between VOUT and GND for stability and transient response. Larger bulk capacitance may be added for high-dynamic-load applications, but the LDO remains stable with just the 0.1µF ceramic placed adjacent to the pins.
AP7351D-18FS4-7B 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AP7351D-18FS4-7B FAQ
1.How can I place an order for AP7351D-18FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-18FS4-7B 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-18FS4-7B reliable?
The price and inventory of AP7351D-18FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-18FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7351D-18FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-18FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-18FS4-7B?
AP7351D-18FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-18FS4-7B 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-18FS4-7B?
For technical support, including AP7351D-18FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-18FS4-7B requirements.
6.How does Aetrix verify that AP7351D-18FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7351D-18FS4-7B 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-18FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7351D-18FS4-7B?
All AP7351D-18FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-18FS4-7B, 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-18FS4-7B part is unused and in its original packaging.
Return procedure for AP7351D-18FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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