My Inquiry
My Account
Diodes Incorporated AP7351D-15FS4-7B
- Part No.:
- AP7351D-15FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7351D-15FS4-7B.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 (T
- Quantity:
- Payment:
- Shipping:
Inventory:9,819
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP7351D-15FS4-7B from Diodes Incorporated is a 1.5V fixed-output, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and enable-controlled shutdown-designed for power management in wearable electronics and IoT sensor modules.
For engineers reviewing the AP7351D-15FS4-7B datasheet, AP7351D-15FS4-7B pinout, AP7351D-15FS4-7B application, or AP7351D-15FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (0.43V typ), thermal shutdown threshold (+160°C), active output discharge, and compatibility with 0.1µF ceramic input/output capacitors.
Technical Context
The AP7351D-15FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path. Its enable input supports direct logic-level control with EN high threshold ≥1.0V and low threshold ≤0.4V, enabling precise power sequencing in battery-constrained systems.
It operates across 1.4V to 5.5V input range while maintaining 1.5V output with ±1% accuracy at +25°C and ±2% over −40°C to +85°C. PSRR reaches 60dB at 1kHz, and dropout voltage is specified at 0.43V (typ) / 0.75V (max) under 150mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±1% at +25°C; ensures stable bias for low-voltage MCUs and sensors without external feedback. |
| Max Output Current | 150mA continuous; sufficient to power BLE SoCs, image sensor interfaces, or multi-node sensor hubs. |
| Quiescent Current | 0.5µA typical; extends battery life in always-on wearables by minimizing standby drain. |
| Dropout Voltage | 0.43V (typ) at 150mA; enables operation down to 1.93V input, critical for single-cell Li-ion or coin-cell applications. |
| PSRR | 60dB at 1kHz; suppresses switching noise from adjacent DC-DC converters in mixed-signal PCB layouts. |
| Enable Thresholds | VEN(H) ≥1.0V, VEN(L) ≤0.4V; compatible with 1.8V/3.3V GPIO without level-shifting. |
| Thermal Shutdown | +160°C with +20°C hysteresis; protects against sustained overload in sealed enclosures. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.65mm pitch, exposed thermal pad (EP) - requires PCB copper area connected to GND for optimal thermal dissipation (θJA = 237°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated output node | Delivers clean 1.5V; must be decoupled with 0.1µF ceramic capacitor placed <1mm from pin. |
| PIN2 (GND) | Power ground reference | Primary return path for load current; connects to EP for thermal conduction and low-impedance grounding. |
| PIN3 (EN) | Active-high enable control | Drives regulator ON/OFF; floating state is invalid; tie to VIN if always-on operation required. |
| PIN4 (VIN) | Input power supply | Accepts 1.4–5.5V; requires local 0.1µF ceramic capacitor between PIN4 and PIN2 to suppress supply transients. |
| EP (Exposed Pad) | Thermal & mechanical anchor | Not electrically functional as GND; soldered to large copper pour tied to system GND for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 0.5µA typical enables >1-year battery life in 10µA average-current wearable devices using CR2032. |
| Active Output Discharge | 35Ω internal discharge path pulls VOUT to GND within 100µs after EN deactivation-prevents floating rail during power sequencing. |
| Stable with 0.1µF COUT | Eliminates need for bulk capacitance; reduces BOM count and PCB area in space-constrained IoT nodes. |
| Wide Input Range | 1.4V min input supports direct connection to partially discharged Li-ion (2.8V–4.2V) or alkaline (1.5V×2) sources. |
| ±1% Output Accuracy | Meets tight tolerance requirements of ADC references, RF front-end biasing, and low-power MCU cores. |
Applications
| Wearable Fitness Tracker | IoT Environmental Sensor Node |
|---|---|
|
Use Scenario: Continuous heart-rate monitoring with optical sensor and BLE radio in wrist-worn form factor. IC Role / Device Role / Timing Role: Primary 1.5V supply for analog front-end and BLE SoC core domain. Use Value: 0.5µA quiescent current extends CR2032 battery life beyond 6 months; active discharge prevents sensor latch-up during mode transitions. |
Use Scenario: Battery-powered temperature/humidity/pressure sensor transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Always-on LDO powering microcontroller RTC and sensor interface during deep sleep. Use Value: ±1% output accuracy ensures consistent ADC reference voltage across temperature; 1.4V min VIN allows operation until battery drops to 1.6V. |
| Wireless Camera Module | Medical Patch Monitor |
|
Use Scenario: Miniaturized HD video streaming module powered by single-cell Li-Po with intermittent recording. IC Role / Device Role / Timing Role: Low-noise 1.5V rail for image signal processor and MIPI interface. Use Value: 60dB PSRR at 1kHz suppresses switching noise from buck converter powering digital logic, preserving SNR in analog video path. |
Use Scenario: Disposable ECG patch operating for 7 days on button cell, requiring clinical-grade voltage stability. IC Role / Device Role / Timing Role: Precision bias source for instrumentation amplifier and ADC reference buffer. Use Value: ±1% output accuracy maintained over −40°C to +85°C ensures consistent gain calibration; thermal shutdown prevents skin-contact overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361D-15FS4-7B | 250mA output rating, same 0.5µA IQ, identical pinout and package | Supports higher peak loads (e.g., camera flash LED drivers) but larger dropout (0.55V typ @250mA) | Select when future design scaling requires >150mA margin without layout change. |
| MCP1700T-1502E/TT | 250mA, 1.6µA IQ, SOT-23-5 package, no active discharge | Lacks output discharge; requires external MOSFET for rail collapse; higher quiescent current increases standby drain | Choose only if SOT-23-5 footprint is mandatory and active discharge is not needed. |
Compared with AP7351D-15FS4-7B, AP7361D-15FS4-7B trades higher current capability for slightly worse dropout, while MCP1700T-1502E/TT sacrifices ultra-low IQ and discharge functionality for legacy package compatibility.
Availability
AP7351D-15FS4-7B is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, wireless camera modules, and medical patch monitors requiring stable component supply with guaranteed long-term availability.
Supply support for AP7351D-15FS4-7B 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, with manufacturing certified to IATF 16949 and product qualification per AEC-Q100 for automotive use.
The AP7351D belongs to Diodes' ultra-low-IQ LDO family, engineered specifically for extended-battery-life applications in portable and energy-harvesting systems where micropower efficiency and small footprint are critical.
FAQ
What is the minimum input voltage required for AP7351D-15FS4-7B to regulate 1.5V output at full 150mA load?
The minimum input voltage is determined by dropout voltage: at 150mA, typical dropout is 0.43V, so VIN(min) = 1.5V + 0.43V = 1.93V. The absolute minimum VIN specification is 1.4V, but regulation fails below 1.93V under full load. For reliable operation, maintain VIN ≥2.0V at peak current.
Does AP7351D-15FS4-7B require an external pull-up resistor on the EN pin?
No external pull-up is required. The EN pin has no internal pull-up; it must be driven actively high (≥1.0V) or low (≤0.4V). If always-on operation is needed, connect EN directly to VIN. Leaving EN floating violates Absolute Maximum Ratings and may cause erratic behavior or damage.
Can AP7351D-15FS4-7B be used with ceramic capacitors smaller than 0.1µF?
No. The datasheet specifies stability with ≥0.1µF ceramic output capacitance (X5R/X7R dielectric). Using smaller values risks oscillation due to insufficient phase margin. Input capacitor must also be ≥0.1µF ceramic, placed within 1mm of VIN and GND pins.
Is the exposed pad (EP) on the X2-DFN1010-4 (Type B) package electrically connected to GND?
No-the EP is thermally conductive but electrically isolated. It must be soldered to a PCB copper area tied to system GND for heat dissipation, but it serves no electrical function and must not be used as the sole GND connection point. Pin 2 (GND) remains the primary electrical ground terminal.
AP7351D-15FS4-7B 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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 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-15FS4-7B FAQ
1.How can I place an order for AP7351D-15FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-15FS4-7B 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-15FS4-7B reliable?
The price and inventory of AP7351D-15FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-15FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7351D-15FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-15FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-15FS4-7B?
AP7351D-15FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-15FS4-7B 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-15FS4-7B?
For technical support, including AP7351D-15FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-15FS4-7B requirements.
6.How does Aetrix verify that AP7351D-15FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7351D-15FS4-7B 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-15FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7351D-15FS4-7B?
All AP7351D-15FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-15FS4-7B, 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-15FS4-7B part is unused and in its original packaging.
Return procedure for AP7351D-15FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP7351D-15FS4-7B Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
