My Inquiry
My Account
Diodes Incorporated AP7351D-33W5-7
- Part No.:
- AP7351D-33W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7351D-33W5-7.pdf
- Description:
- LDO CMOS LOWCURR SOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP7351D-33W5-7 from Diodes Incorporated is a fixed 3.3V, 150mA ultra-low quiescent current LDO regulator in SOT25 package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and enable-controlled shutdown. It operates from 1.4V to 5.5V input and delivers stable power to low-power wearable sensors and IoT edge nodes requiring extended battery life.
For engineers reviewing the AP7351D-33W5-7 datasheet, AP7351D-33W5-7 pinout, AP7351D-33W5-7 application, or AP7351D-33W5-7 equivalent, key selection criteria include dropout voltage at 150mA (0.16V typ), EN logic thresholds (0.4V low / 1.0V high), active output discharge resistance (35Ω), and thermal shutdown at +160°C.
Technical Context
The AP7351D-33W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and enable-controlled pass transistor in a single-stage LDO architecture. Its internal resistor network fixes VOUT at 3.3V, eliminating external feedback components.
It supports active output discharge during shutdown via an internal 35Ω pull-down path from VOUT to GND, ensuring rapid rail collapse. Thermal protection triggers at +160°C with +20°C hysteresis, and the device maintains stability with only 0.1µF ceramic input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% at +25°C; ±2% over −40°C to +85°C - ensures reliable MCU core/logic rail tolerance |
| Max Output Current | 150mA continuous - sufficient for BLE SoCs, PMIC rails, and sensor signal chains |
| Quiescent Current | 0.5µA typ (1µA max) - enables >10-year battery life in coin-cell–powered devices |
| Dropout Voltage | 0.16V typ at 150mA - allows operation down to VIN = 3.46V while maintaining regulation |
| PSRR | 60dB at 1kHz - suppresses switching noise from adjacent DC/DC converters |
| Enable Thresholds | VEN(H) ≥ 1.0V, VEN(L) ≤ 0.4V - compatible with 1.8V/3.3V GPIO without level-shifting |
| Thermal Shutdown | +160°C trigger with +20°C hysteresis - prevents damage during sustained overload or poor PCB heatsinking |
Pinout & Package
SOT25 package (3.0mm × 2.8mm × 1.3mm), moisture sensitivity level 1, tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated output node | Delivers fixed 3.3V; requires 0.1µF ceramic capacitor placed adjacent to pin for stability and transient response |
| PIN2 (GND) | Power ground reference | Must connect to low-impedance system ground plane; shared return path for input/output caps and load |
| PIN3 (EN) | Active-high enable control | Pull ≥1.0V to activate; ≤0.4V to enter shutdown (0.02µA standby); must never float |
| PIN4 (VIN) | Input power supply | Accepts 1.4V–5.5V; requires 0.1µF decoupling cap placed within 2mm of pin to suppress supply glitches |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 0.5µA typ enables multi-year operation on CR2032 (225mAh) powering intermittent BLE sensors |
| Active output discharge | 35Ω internal FET pulls VOUT to GND in <1ms after EN deactivation - prevents back-powering of upstream circuits |
| Wide input range | 1.4V–5.5V supports direct Li-ion, Li-Po, 2×AA, or USB-supplied systems without pre-regulation |
| High PSRR | 60dB at 1kHz rejects ripple from noisy switchers feeding mixed-signal SoCs or ADC references |
| ±1% VOUT accuracy | Meets tight tolerance requirements for 3.3V I/O rails in FPGA, microcontroller, and RF transceiver interfaces |
Applications
| Wearable Health Monitor | IoT Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing powered by coin cell with 5-year target lifetime. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying analog front-end, MCU, and BLE radio. Use Value: 0.5µA quiescent current extends battery life beyond 60 months; ±1% VOUT ensures ADC reference stability across temperature. |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Always-on 3.3V rail for real-time clock, sensor interface, and wake-up controller. Use Value: Active discharge prevents leakage through sensor bias networks during sleep; 1.4V min VIN enables operation until battery drops to 1.4V. |
| Wireless Camera Module | Industrial Edge Controller |
Use Scenario: Compact Wi-Fi camera using lithium polymer battery with burst-mode video capture. IC Role / Device Role / Timing Role: Dedicated 3.3V supply for image sensor and ISP, enabled only during capture. Use Value: EN pin allows precise power gating; 150mA output sustains peak sensor+ISP load without dropout. |
Use Scenario: DIN-rail mounted PLC module operating in −40°C to +85°C industrial environment. IC Role / Device Role / Timing Role: Secondary 3.3V rail for isolated communication interface (RS-485 transceiver, CAN PHY). Use Value: Thermal shutdown at +160°C protects against enclosure overheating; ±2% VOUT tolerance maintained across full temp range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 100mA max output, 1.6µA IQ, no active discharge, TO-92 package | Limited to lower-current analog sensors; lacks fast rail collapse for multi-rail sequencing | Select when cost-sensitive, low-volume TO-92 assembly is preferred and discharge not required |
| TPS70633DBVR | 150mA, 1.7µA IQ, 0.25V dropout at 150mA, no active discharge, SOT23-5 | Higher IQ reduces battery life by ~3.4×; requires external discharge circuit if needed | Choose for TI ecosystem compatibility or where slightly better dropout is prioritized over ultra-low IQ |
Compared with MCP1700-3302E/TO and TPS70633DBVR, AP7351D-33W5-7 delivers the lowest quiescent current (0.5µA vs. 1.6–1.7µA), integrated active discharge, and tighter VOUT accuracy (±1% vs. ±2%), making it optimal for long-life, space-constrained, multi-rail battery systems.
Availability
AP7351D-33W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, wireless camera modules, and industrial edge controllers requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP7351D-33W5-7 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 ICs for power management, signal integrity, and connectivity applications.
The AP7351D belongs to Diodes' ultra-low-IQ LDO family, designed specifically for battery-powered wearables, medical patches, and energy-harvesting IoT endpoints where micropower efficiency and small footprint are critical.
FAQ
What is the minimum input voltage required for AP7351D-33W5-7 to regulate 3.3V at 150mA?
The minimum input voltage is determined by dropout: typical 0.16V at 150mA means VIN must be ≥3.46V to maintain regulation. At worst-case 0.35V dropout (per datasheet max), VIN must be ≥3.65V. Below 3.46V, output follows input minus dropout voltage.
Does AP7351D-33W5-7 require an external pull-up on the EN pin?
No external pull-up is required. The EN pin has no internal pull-up; it must be actively driven high (≥1.0V) to enable or low (≤0.4V) to disable. Leaving it floating risks undefined operation - tie directly to VIN or a controlled GPIO.
Can AP7351D-33W5-7 be used with ceramic capacitors smaller than 0.1µF?
No. The datasheet specifies stability with ≥0.1µF ceramic capacitors on both input and output. Using smaller values risks oscillation or degraded transient response due to insufficient phase margin and ESR interaction.
Is the exposed pad on SOT25 electrically connected or thermal-only?
The SOT25 package for AP7351D-33W5-7 does not include an exposed pad. Only the X2-DFN1010-4 (Type B) variant features an exposed thermal pad (EP), which is not electrically connected and should be tied to GND or left floating per layout guidelines.
AP7351D-33W5-7 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):
- 3.3V
- 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-33W5-7 FAQ
1.How can I place an order for AP7351D-33W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7351D-33W5-7 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-33W5-7 reliable?
The price and inventory of AP7351D-33W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-33W5-7 is usually 5 days.
3.What payment methods are accepted for AP7351D-33W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-33W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7351D-33W5-7?
AP7351D-33W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7351D-33W5-7 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-33W5-7?
For technical support, including AP7351D-33W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-33W5-7 requirements.
6.How does Aetrix verify that AP7351D-33W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7351D-33W5-7 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-33W5-7 meets industry standards.
7.What is the process for return or replacement of AP7351D-33W5-7?
All AP7351D-33W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-33W5-7, 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-33W5-7 part is unused and in its original packaging.
Return procedure for AP7351D-33W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP7351D-33W5-7 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.…
