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Diodes Incorporated AP7351D-27W5-7
- Part No.:
- AP7351D-27W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7351D-27W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP7351D-27W5-7 from Diodes Incorporated is a 2.7V fixed-output, 150mA ultra-low quiescent current LDO regulator in SOT25 package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and enable-controlled shutdown for battery-powered wearable and IoT sensor modules.
For engineers reviewing the AP7351D-27W5-7 datasheet, AP7351D-27W5-7 pinout, AP7351D-27W5-7 application, or AP7351D-27W5-7 equivalent, this page delivers verified electrical specs, thermal performance data, EN-controlled startup timing, dropout behavior at 150mA, and real-world layout guidance for low-noise power delivery in space-constrained portable designs.
Technical Context
The AP7351D-27W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path. Its internal resistor network fixes VOUT at 2.7V with ±1% accuracy over −40°C to +85°C ambient.
It operates across 1.4V–5.5V input range, delivers up to 150mA load current, and achieves 60dB PSRR at 1kHz. The EN pin supports clean turn-on/turn-off control with defined VIH/VIL thresholds (1.0V/0.4V), and thermal shutdown activates at +160°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.7V ±1% at +25°C; ±2% over full temperature range - ensures stable rail for 2.7V logic or analog sensors. |
| Quiescent Current | 0.5µA typical - extends battery life in always-on wearables and remote IoT nodes. |
| Dropout Voltage | 0.2V typical at 150mA - enables operation down to VIN = 2.9V while maintaining regulation. |
| PSRR | 60dB at 1kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO. |
| Enable Thresholds | VEN(HI) ≥ 1.0V, VEN(LO) ≤ 0.4V - compatible with 1.8V/3.3V GPIO without level-shifting. |
| Thermal Shutdown | Triggers at +160°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Output Discharge | 35Ω internal pull-down when disabled - clears VOUT rapidly to avoid back-powering downstream circuitry. |
Pinout & Package
SOT25 package (3.0mm × 2.8mm × 1.3mm), moisture sensitivity level 1, lead-free and RoHS compliant. Exposed pad optional for thermal enhancement; recommended to connect to GND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated output | Delivers stable 2.7V; requires 0.1µF ceramic capacitor placed adjacent to pin for stability and transient response. |
| PIN2 (GND) | Power ground reference | Low-impedance return path; must connect directly to solid ground plane to minimize noise coupling and voltage drop. |
| PIN3 (EN) | Enable control input | Active-high logic input; must be driven to ≥1.0V to enable, ≤0.4V to disable - floating state is prohibited. |
| PIN4 (VIN) | Input power supply | Accepts 1.4V–5.5V; requires local 0.1µF decoupling capacitor between PIN4 and PIN2 to suppress supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 0.5µA typical - reduces standby power loss by >95% vs. standard LDOs, critical for multi-year battery life. |
| Active Output Discharge | 35Ω internal FET - discharges VOUT within microseconds after shutdown, preventing unintended wake-up or latch-up in sequenced systems. |
| Wide Input Range | 1.4V–5.5V - supports direct Li-ion, Li-poly, coin-cell, or regulated 3.3V/5V rails without external pre-regulation. |
| High PSRR at Low Frequency | 60dB @ 1kHz - maintains clean 2.7V rail even when powered from noisy switchers or shared power domains. |
| Thermal Protection | +160°C shutdown with +20°C hysteresis - enables safe operation under sustained 150mA loads on minimal copper area. |
Applications
| Wearable Electronics | Sensor Module for IoT |
|---|---|
Use Scenario: Compact fitness tracker with optical heart-rate sensor and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 2.7V supply for analog front-end and BLE SoC core logic. Use Value: 0.5µA quiescent current extends coin-cell life beyond 12 months; active discharge prevents sensor bias leakage during sleep mode. |
Use Scenario: Battery-powered environmental sensor node (temperature/humidity/pressure) transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Regulated 2.7V rail for ultra-low-power MCU and MEMS sensors during periodic wake-up bursts. Use Value: 1.4V minimum VIN allows operation down to single alkaline cell depletion; EN pin enables precise MCU-controlled power gating. |
| Wireless Communication Module | Camera/Image Sensor |
Use Scenario: Cellular NB-IoT module integrated into smart meter design with 10-year battery requirement. IC Role / Device Role / Timing Role: Standby power regulator for modem baseband IC and RF transceiver during deep-sleep intervals. Use Value: 0.02µA standby current minimizes self-discharge; ±1% VOUT accuracy ensures consistent RF PA bias and ADC reference stability. |
Use Scenario: Miniature USB camera module using CMOS image sensor with analog signal chain. IC Role / Device Role / Timing Role: Clean 2.7V supply for image sensor analog core and PLL clock generation circuitry. Use Value: 60dB PSRR at 1kHz rejects noise from USB 5V-to-3.3V conversion; low dropout preserves headroom for sensor biasing at low battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2702E/TT | 2.7V fixed, 250mA, 1.6µA IQ, no output discharge, SOT23-3 | Lacks EN pin and active discharge; higher quiescent current reduces battery life in always-on use cases. | Select only if board space is constrained to 3-pin SOT23 and discharge functionality is unnecessary. |
| TPS70627DBVR | 2.7V fixed, 150mA, 1.3µA IQ, EN pin, no output discharge, SOT23-5 | Higher IQ and missing discharge path limit suitability for long-duration battery operation with sensitive downstream circuitry. | Prefer when TI ecosystem compatibility or tighter line/load regulation (±0.5%) is prioritized over ultra-low IQ and discharge. |
Compared with MCP1700T-2702E/TT and TPS70627DBVR, AP7351D-27W5-7 uniquely combines sub-µA quiescent current, EN control, and active output discharge in a 4-pin SOT25 - making it optimal for battery-critical, sequenced-power systems where rapid rail collapse and minimal standby drain are mandatory.
Availability
AP7351D-27W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, wireless communication modules, and camera/image sensor subsystems requiring stable component supply with guaranteed long-term availability.
Supply support for AP7351D-27W5-7 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 devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q100 for automotive-grade components.
The AP7351D belongs to Diodes' ultra-low-IQ LDO family, engineered specifically for extended-life battery applications in wearables, medical patches, and remote IoT endpoints where microamp-level standby current is non-negotiable.
FAQ
What is the minimum input voltage required for AP7351D-27W5-7 to maintain regulation at full 150mA load?
The minimum input voltage is determined by dropout voltage plus nominal VOUT. At 150mA and +25°C, dropout is 0.2V typical, so VIN(min) = 2.7V + 0.2V = 2.9V. Under worst-case conditions (−40°C to +85°C), max dropout is 0.45V, requiring VIN ≥ 3.15V for guaranteed regulation at full load.
Can the EN pin be left unconnected if enable functionality is not needed?
No - the EN pin must never be left floating. If enable control is unused, tie EN directly to VIN to ensure continuous operation. Floating EN may cause erratic startup, oscillation, or undefined output state due to noise susceptibility and undefined logic threshold behavior.
Is an output capacitor mandatory, and what type is recommended?
Yes - a minimum 0.1µF ceramic capacitor (X5R/X7R) is required between VOUT and GND for stability and transient response. Place it within 2mm of the pins. For high-delta-I loads, add a 1–10µF low-ESR bulk capacitor in parallel to reduce ripple and improve load-step recovery.
Does AP7351D-27W5-7 support automotive qualification?
The AP7351D-27W5-7 itself is not AEC-Q100 qualified. However, Diodes offers automotive-grade variants (e.g., AP7351D-27W5-7Q) with PPAP capability, manufactured in IATF 16949 facilities. Contact Diodes or Aetrix for qualified part numbers and qualification documentation.
AP7351D-27W5-7 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):
- 2.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 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-27W5-7 FAQ
1.How can I place an order for AP7351D-27W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-27W5-7 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-27W5-7 reliable?
The price and inventory of AP7351D-27W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-27W5-7 is usually 5 days.
3.What payment methods are accepted for AP7351D-27W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-27W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-27W5-7?
AP7351D-27W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-27W5-7 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-27W5-7?
For technical support, including AP7351D-27W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-27W5-7 requirements.
6.How does Aetrix verify that AP7351D-27W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7351D-27W5-7 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-27W5-7 meets industry standards.
7.What is the process for return or replacement of AP7351D-27W5-7?
All AP7351D-27W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-27W5-7, 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-27W5-7 part is unused and in its original packaging.
Return procedure for AP7351D-27W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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