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Diodes Incorporated AP7351D-45W5-7
- Part No.:
- AP7351D-45W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7351D-45W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
AP7351D-45W5-7 from Diodes Incorporated is a fixed 4.5V, 150mA ultra-low quiescent current LDO regulator in SOT25 package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and integrated enable control. It delivers stable power to low-power sensor modules and wearable electronics operating from 1.4V–5.5V input sources.
For engineers reviewing the AP7351D-45W5-7 datasheet, AP7351D-45W5-7 pinout, AP7351D-45W5-7 application, or AP7351D-45W5-7 equivalent, key selection criteria include dropout voltage at 150mA (max 0.35V), active output discharge, thermal shutdown threshold (+160°C), and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-45W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path. Its enable input (EN) accepts logic-level signals (VIH ≥ 1.0V, VIL ≤ 0.4V) to control regulation state with standby current as low as 0.02µA.
Designed for battery-constrained systems, it maintains ±2% output accuracy across –40°C to +85°C ambient and supports load transients up to 150mA with <45mV load regulation deviation for the 4.5V version. PSRR reaches 60dB at 1kHz under 3.3V output conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5V ±1% at +25°C; ±2% over full temperature range |
| Max Output Current | 150mA continuous - supports peak sensor burst loads without dropout |
| Quiescent Current | 0.5µA typical - extends battery life in always-on IoT endpoints |
| Dropout Voltage | 0.14V (typ) / 0.35V (max) at 150mA - enables operation down to 4.64V input |
| PSRR | 60dB at 1kHz - suppresses switching noise from upstream DC/DC converters |
| Enable Thresholds | VIH ≥ 1.0V, VIL ≤ 0.4V - compatible with 1.8V/3.3V GPIO without level shifters |
| Thermal Shutdown | +160°C activation with +20°C hysteresis - prevents thermal runaway during overload |
Pinout & Package
SOT25 package (3.0mm × 2.8mm × 1.3mm), moisture sensitivity level 1, lead-free and RoHS-compliant. Exposed pad recommended for thermal relief but not used as GND electrode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 - VOUT | Regulated output node | Delivers fixed 4.5V; requires 0.1µF ceramic capacitor placed adjacent to pin |
| PIN2 - GND | Power ground reference | Must connect to low-impedance PCB ground plane; shared return for input/output caps |
| PIN3 - EN | Active-high enable control | Pull ≥1.0V to activate; pull ≤0.4V to enter 0.02µA shutdown; must not float |
| PIN4 - VIN | Input power supply | Accepts 1.4V–5.5V; requires 0.1µF decoupling cap placed within 2mm of pin |
| PIN5 - NC | No connection | Not bonded; leave unconnected per datasheet - no routing or soldering required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.5µA typical enables >10-year battery life in coin-cell-powered sensors |
| Active output discharge | 35Ω internal discharge path clears VOUT rapidly on disable - prevents floating rail issues |
| Wide input voltage range | 1.4V–5.5V supports single-cell Li-ion, LiFePO₄, and multi-cell alkaline inputs |
| High accuracy over temperature | ±2% output tolerance from –40°C to +85°C ensures reliable MCU core voltage |
| Low ESR capacitor compatibility | Stable with 0.1µF X5R/X7R ceramics - eliminates need for bulk electrolytic capacitors |
Applications
| Wearable Health Monitor | IoT Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 4.5V supply for analog front-end and BLE SoC during active measurement cycles. Use Value: 0.5µA quiescent current extends battery life to 3+ years in sleep mode; 0.35V dropout allows operation until battery depletes to 4.64V. |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Stable 4.5V rail for sensor ICs and microcontroller during brief 200ms active window. Use Value: Active discharge clears VOUT within 100µs after shutdown - prevents residual charge from interfering with next wake-up cycle. |
| Wireless Camera Module | Industrial Asset Tracker |
|
Use Scenario: Compact HD camera module in smart doorbell, powered by rechargeable Li-ion pack. IC Role / Device Role / Timing Role: Clean 4.5V supply for image sensor and ISP during video capture bursts. Use Value: 60dB PSRR at 1kHz suppresses noise from switching charger IC, reducing image sensor artifacts. |
Use Scenario: GPS-enabled tracker mounted on fleet vehicles, operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main power regulator for GNSS receiver and cellular modem during periodic location reporting. Use Value: ±2% output accuracy over full temperature range ensures consistent modem RF performance without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-4502E/TO | Same 4.5V output, 250mA rating, but 1.8µA quiescent current - 3.6× higher than AP7351D-45W5-7 | Lacks active output discharge; requires external circuitry for fast VOUT decay | Select when higher output current margin is needed and ultra-low IQ is secondary |
| Torex XC6219B452MR-G | 4.5V output, 0.6µA IQ, but only 100mA rated output - insufficient for 150mA peak loads | Smaller USP-4 package (1.2mm × 1.6mm); no exposed pad for thermal relief | Select for space-constrained designs where 100mA max load is sufficient and thermal headroom is adequate |
Compared with MCP1700-4502E/TO and XC6219B452MR-G, the AP7351D-45W5-7 uniquely balances 150mA capability, 0.5µA IQ, and integrated discharge in a thermally enhanced SOT25 - making it optimal for battery-powered edge nodes requiring both runtime and rapid state transitions.
Availability
AP7351D-45W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, wireless camera modules, and industrial asset trackers requiring stable component supply with long-term manufacturability.
Supply support for AP7351D-45W5-7 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-operated systems where micropower efficiency and output stability under light-load conditions are critical.
FAQ
What is the minimum input voltage required for AP7351D-45W5-7 to maintain regulation at full 150mA load?
The minimum input voltage is calculated as VOUT + VDROP(max) = 4.5V + 0.35V = 4.85V. At 150mA load and +25°C, the typical dropout is 0.14V, allowing operation down to 4.64V. The device guarantees regulation across –40°C to +85°C ambient with input ≥4.85V.
Does AP7351D-45W5-7 require an external pull-up resistor on the EN pin if always enabled?
No external pull-up is required. The EN pin can be directly tied to VIN to ensure permanent enable. The EN input draws negligible current (<10nA), so connecting it to VIN imposes no meaningful load. Floating the EN pin is strictly prohibited and will cause undefined regulator behavior.
Can AP7351D-45W5-7 be used with tantalum output capacitors instead of ceramic?
No. The AP7351D-45W5-7 is optimized for ceramic capacitors with ESR <100mΩ. Tantalum capacitors typically exhibit higher ESR and risk instability or oscillation. The datasheet explicitly recommends X5R/X7R ceramics and warns against high-ESR types due to phase-margin degradation.
Is the NC pin (PIN5) electrically isolated or internally connected in SOT25 package?
PIN5 is a true no-connect terminal - not bonded to any die structure. It serves only as mechanical support in the SOT25 mold compound and carries no electrical function. PCB layout must leave this pad unconnected; soldering or routing to it violates the manufacturer's mechanical and thermal specifications.
AP7351D-45W5-7 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):
- 4.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 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-45W5-7 FAQ
1.How can I place an order for AP7351D-45W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-45W5-7 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-45W5-7 reliable?
The price and inventory of AP7351D-45W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-45W5-7 is usually 5 days.
3.What payment methods are accepted for AP7351D-45W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-45W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-45W5-7?
AP7351D-45W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-45W5-7 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-45W5-7?
For technical support, including AP7351D-45W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-45W5-7 requirements.
6.How does Aetrix verify that AP7351D-45W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7351D-45W5-7 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-45W5-7 meets industry standards.
7.What is the process for return or replacement of AP7351D-45W5-7?
All AP7351D-45W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-45W5-7, 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-45W5-7 part is unused and in its original packaging.
Return procedure for AP7351D-45W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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