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Diodes Incorporated AP7351D-185W5-7
- Part No.:
- AP7351D-185W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7351D-185W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,157
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Product details
Overview
AP7351D-185W5-7 from Diodes Incorporated is a 150mA ultra-low quiescent current LDO regulator with fixed 1.85V output, ±1% accuracy at +25°C, 0.32V typical dropout at 150mA, and 0.5µA quiescent current. It features enable control, active output discharge, and operates across 1.4V–5.5V input range. Designed for battery-powered wearable electronics and IoT sensor modules requiring extended runtime.
For engineers reviewing the AP7351D-185W5-7 datasheet, AP7351D-185W5-7 pinout, AP7351D-185W5-7 application, or AP7351D-185W5-7 equivalent, key selection criteria include guaranteed 150mA output under 1.4V input, sub-1µA quiescent current in active mode, thermal shutdown at +160°C, and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-185W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path. Its internal resistor network fixes VOUT to 1.85V, eliminating external feedback components.
Enable logic accepts 1.0V–5.5V high-level input to activate regulation and ≤0.4V low-level input to enter shutdown (0.02µA standby). The device delivers stable regulation down to 1.4V VIN while maintaining ±2% output accuracy over –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85V ±1% at +25°C; ±2% over full temperature range - ensures stable biasing for 1.8V logic and RF front-end ICs. |
| Max Output Current | 150mA guaranteed - supports moderate-power sensors, BLE transceivers, and microcontroller peripherals without derating. |
| Quiescent Current | 0.5µA typical - extends battery life in always-on wearables and remote IoT nodes operating on coin cells. |
| Dropout Voltage | 0.32V typical at 150mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (2.4V min) sources. |
| PSRR | 60dB at 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input, critical for analog/RF signal chains. |
| Enable Threshold | VEN(H) ≥1.0V, VEN(L) ≤0.4V - compatible with 1.8V/3.3V GPIO without level-shifting; prevents floating-induced instability. |
| Thermal Shutdown | +160°C with +20°C hysteresis - protects against PCB overheating during sustained 150mA load in confined enclosures. |
Pinout & Package
SOT25 package (3.0mm × 2.8mm × 1.3mm), RoHS-compliant matte tin-plated leads, moisture sensitivity level 1. Exposed pad not electrically connected; recommended to connect to GND for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated output node | Delivers 1.85V to load; requires 0.1µF ceramic capacitor placed adjacent to minimize ESR-induced instability. |
| PIN2 (GND) | Power ground reference | Primary return path for input/output currents; must connect directly to low-impedance ground plane to avoid regulation error. |
| PIN3 (EN) | Active-high enable control | Drives regulator ON/OFF; must be terminated to VIN or MCU GPIO - floating state causes undefined output behavior. |
| PIN4 (VIN) | Unregulated input supply | Accepts 1.4V–5.5V; requires local 0.1µF decoupling capacitor to suppress supply rail noise and transient droop. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.5µA active / 0.02µA shutdown - enables >1-year battery life in BLE beacon applications drawing 5µA average current. |
| Active output discharge | 35Ω internal FET discharges VOUT when EN = LOW - prevents residual voltage from interfering with power sequencing in multi-rail systems. |
| Wide input voltage range | 1.4V to 5.5V - supports direct connection to partially discharged Li-ion cells (2.8V–4.2V) and USB-powered designs. |
| High PSRR at 1kHz | 60dB - maintains clean 1.85V supply for ADC references and PLL VCOs despite noisy DC-DC input ripple. |
| ±1% output accuracy | At +25°C, 5mA load - ensures reliable operation of 1.8V I/O interfaces and memory controllers without margining overhead. |
Applications
| Wearable Fitness Tracker | IoT Environmental Sensor Node |
|---|---|
Use Scenario: Continuous heart-rate monitoring using optical sensor and ARM Cortex-M0+ MCU powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 1.85V power rail for sensor analog front-end and MCU core, enabled only during measurement bursts. Use Value: 0.5µA quiescent current extends battery life to 18 months; active discharge prevents sensor latch-up during sleep/wake transitions. |
Use Scenario: Battery-operated soil moisture and temperature node transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Stable 1.85V supply for ultra-low-power MCU, RF transceiver, and capacitive sensing circuitry. Use Value: 1.4V minimum input allows operation until battery reaches 1.6V; ±1% accuracy ensures consistent ADC reference across temperature swings. |
| Wireless Earbud Charging Case | Smart Camera Module |
Use Scenario: Compact charging case powering Bluetooth audio SoC and status LEDs during earbud recharge cycles. IC Role / Device Role / Timing Role: Secondary LDO supplying 1.85V to Bluetooth baseband processor and charge management IC. Use Value: 0.32V dropout enables efficient use of 3.7V Li-ion cell; thermal shutdown protects against pocket overheating during fast charging. |
Use Scenario: Embedded vision module in industrial inspection system using CMOS image sensor with 1.8V digital I/O. IC Role / Device Role / Timing Role: Dedicated 1.85V rail for image sensor digital interface and ISP logic, isolated from noisy motor drivers. Use Value: 60dB PSRR rejects switching noise from adjacent 12V-to-5V DC-DC converter, preventing image artifacts and frame drops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 150mA, 1.8V fixed, 1.6µA IQ, no enable pin, no output discharge | Lacks EN control and active discharge - unsuitable for power-gated systems requiring clean rail collapse | Select only if enable functionality and output discharge are unnecessary and higher IQ is acceptable. |
| Torex XC6210B182MR-G | 150mA, 1.8V fixed, 1.0µA IQ, EN pin, no output discharge, 0.25V dropout @150mA | Lower dropout but no active discharge; tighter ±0.8% accuracy at +25°C | Prefer when minimal dropout is critical and output discharge is handled externally via MOSFET. |
Compared with MCP1700T-1802E/TT and XC6210B182MR-G, the AP7351D-185W5-7 uniquely combines sub-1µA quiescent current, integrated enable, and active output discharge in a 5-pin SOT25 package - essential for space-constrained, battery-sensitive designs requiring precise power sequencing.
Availability
AP7351D-185W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, wireless communication modules, and other battery-operated devices requiring stable component supply with ultra-low power consumption.
Supply support for AP7351D-185W5-7 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 company 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, engineered specifically for energy-harvesting and battery-powered edge devices where micropower efficiency and small footprint are primary design constraints.
FAQ
What is the minimum input voltage required for regulation at 150mA output?
The AP7351D-185W5-7 maintains regulation down to 1.4V input across its full operating temperature range. At 150mA load and +25°C, the dropout voltage is 0.32V typical, meaning VIN must be ≥2.17V to sustain 1.85V output. Below 1.4V, the device ceases regulation and enters undervoltage lockout.
Does the EN pin require an external pull-up resistor?
No external pull-up is required. The EN pin has internal weak pull-down; driving it directly to VIN or MCU GPIO suffices. However, if left unconnected, the internal pull-down ensures the device remains off. Floating EN is strictly prohibited as it may cause erratic output behavior due to noise coupling.
Can the AP7351D-185W5-7 be used with tantalum output capacitors?
Yes, but with caution. While the device is optimized for 0.1µF ceramic capacitors (X5R/X7R), low-ESR tantalum capacitors may be used if ESR falls within 10mΩ–100mΩ and capacitance is ≥1µF. Excessive ESR can degrade transient response and stability; refer to Figure 19 in DS42111 Rev. 4-2 for ESR vs. IOUT stability boundaries.
Is the exposed pad on the SOT25 package electrically connected?
No. The exposed pad on the SOT25 package is non-functional and thermally isolated. It should be soldered to a large copper pour connected to GND solely for thermal dissipation - not as a current-carrying ground terminal. Using it as the sole GND connection violates the internal bond wire routing and risks thermal overstress.
AP7351D-185W5-7 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):
- 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.58V @ 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-185W5-7 FAQ
1.How can I place an order for AP7351D-185W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-185W5-7 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-185W5-7 reliable?
The price and inventory of AP7351D-185W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-185W5-7 is usually 5 days.
3.What payment methods are accepted for AP7351D-185W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-185W5-7 transactions.
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4.How is shipping managed for AP7351D-185W5-7?
AP7351D-185W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-185W5-7 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-185W5-7?
For technical support, including AP7351D-185W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-185W5-7 requirements.
6.How does Aetrix verify that AP7351D-185W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7351D-185W5-7 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-185W5-7 meets industry standards.
7.What is the process for return or replacement of AP7351D-185W5-7?
All AP7351D-185W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-185W5-7, 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-185W5-7 part is unused and in its original packaging.
Return procedure for AP7351D-185W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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