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Diodes Incorporated AP131-33WL-7
- Part No.:
- AP131-33WL-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP131-33WL-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
AP131-33WL-7 from Diodes Incorporated is a 300mA fixed-output (3.3V) low-dropout linear regulator in SOT25 package, featuring 400mV dropout at full load, 50µA quiescent current, and active-low enable control. It integrates current limit, thermal shutdown, and bandgap reference with BP pin for noise reduction-designed for battery-powered wireless modules and PC peripherals requiring stable low-noise voltage regulation.
For engineers reviewing the AP131-33WL-7 datasheet, AP131-33WL-7 pinout, AP131-33WL-7 application, or AP131-33WL-7 equivalent, key selection criteria include dropout voltage under 300mA load, ±2% output accuracy across temperature, EN pin logic threshold (1.5V ON / 0.8V OFF), and SOT25 thermal resistance (163°C/W).
Technical Context
The AP131-33WL-7 employs a PMOS pass element with internal 1.5Ω RON, enabling low dropout and zero base current draw. Its error amplifier compares feedback from the bandgap reference to regulate output within ±2% over -40°C to +85°C ambient.
Enable control is implemented via an active-low EN pin with <0.1µA leakage and 8µs delay (with 0.1µF BP capacitor). Output noise is reduced by external capacitor on BP pin, and short-circuit protection uses fold-back current limiting with 150–300mA trip range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% at 1mA–300mA load and -40°C to +85°C |
| Dropout Voltage | 400mV typical at 300mA - enables operation down to 3.7V input for 3.3V rail |
| Quiescent Current | 50µA typical at no load and 5V input - preserves battery life in standby |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li-ion, 3.3V/5V system rails |
| Enable Threshold | VENON = 1.5V min, VENOFF = 0.8V max - interfaces directly with 1.8V/3.3V GPIO |
| PSRR | 60dB at 100Hz - suppresses ripple from switching supply upstream |
| Thermal Resistance | θJA = 163°C/W (SOT25) - limits junction rise to ~49°C at 300mA in still air |
Pinout & Package
SOT25 (5-pin, lead-free, halogen-free "Green" package; 2.8mm × 2.9mm footprint, 1.1mm height; JEDEC MO-203AA compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.7–5.5V; requires ≥1µF ceramic input capacitor for stability |
| 2 (EN) | Active-low enable control | Pulled high to enable; <0.1µA leakage allows direct MCU GPIO drive |
| 3 (BP) | Bandgap bypass node | 0.1µF capacitor reduces output noise and improves PSRR at high frequencies |
| 4 (OUT) | Regulated output | Delivers up to 300mA at 3.3V ±2%; requires ≥10µF ceramic output capacitor |
| 5 (GND) | Power ground reference | Common return for IN, OUT, EN, and BP; must be low-impedance PCB plane |
Key Features
| Feature | Design Value |
|---|---|
| Low-quiescent-current LDO | 50µA IQ enables >1-year battery life in always-on IoT sensors drawing 5µA average |
| Fast transient response | Stabilizes within 10µs after 100mA load step - maintains clean power for RF transceivers |
| Integrated fault protection | Thermal shutdown + current fold-back prevent damage during sustained overload or short circuit |
| Bandgap bypass (BP) pin | External 0.1µF capacitor lowers output noise floor by >20dB below 1MHz |
| High-accuracy output | ±2% initial tolerance and <150ppm/°C drift ensure ADC reference stability in data loggers |
Applications
| Wireless Sensor Node | USB Peripheral Power |
|---|---|
Use Scenario: Compact battery-powered Zigbee/Bluetooth LE sensor with intermittent 300mA RF transmit bursts. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying RF SoC and microcontroller during active transmission. Use Value: 400mV dropout ensures operation until battery drops to 3.7V; 50µA quiescent current extends shelf life. | Use Scenario: USB-powered card reader or docking station requiring clean 3.3V for interface ICs. IC Role / Device Role / Timing Role: Post-regulator cleaning noisy 5V USB VBUS before feeding USB PHY and level shifters. Use Value: 60dB PSRR at 100Hz suppresses USB switcher ripple; ±2% accuracy meets USB-IF VIO tolerance. |
| Laptop Docking Port | Industrial Data Acquisition Module |
Use Scenario: Hot-pluggable Thunderbolt/USB-C dock delivering 3.3V to PCIe bridge and display interface ICs. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling high-speed digital I/O from shared 5V rail. Use Value: Fast transient response prevents logic glitches during PCIe link training; EN pin enables hot-swap sequencing. | Use Scenario: DIN-rail mounted analog input module with isolated ADC and microcontroller. IC Role / Device Role / Timing Role: Precision 3.3V supply for SAR ADC reference and low-noise signal chain amplifiers. Use Value: BP pin filtering reduces broadband noise coupling into 16-bit ADC; ±2% output ensures measurement linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-33W5-7 | Higher 500mA rating, 250mV dropout at 300mA, same SOT25 package | Better suited for higher-current loads; not recommended for new designs per Diodes' datasheet note | Select if future-proofing for >300mA peak or lower dropout is required |
| MCP1700-3302E/TO | 250mA max, 600mV dropout at 250mA, TO-92 package (larger, through-hole) | Lower cost but higher dropout and thermal resistance; lacks BP pin for noise filtering | Prefer for legacy through-hole designs where board space and noise are less critical |
Compared with AP7343-33W5-7 and MCP1700-3302E/TO, the AP131-33WL-7 offers optimal balance of ultra-low IQ (50µA), integrated BP noise reduction, and SOT25 footprint-making it ideal for space-constrained, battery-sensitive applications where 300mA is sufficient.
Availability
AP131-33WL-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripherals, laptop docking ports, and industrial data acquisition modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP131-33WL-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AP131 series belongs to Diodes' precision LDO portfolio, engineered specifically for portable and battery-powered systems demanding low IQ, tight output accuracy, and robust fault protection in compact packages.
FAQ
What is the minimum input voltage required for AP131-33WL-7 to maintain regulated 3.3V output at 300mA?
The minimum input is 3.7V: dropout voltage is 400mV typical at 300mA, so VIN ≥ VOUT + VDROP = 3.3V + 0.4V = 3.7V. At lower inputs, output collapses linearly; operation below 2.7V violates absolute maximum rating and is not functional.
Can the BP pin be left unconnected, and what impact does that have on performance?
Yes, BP can be left floating, but doing so increases output noise by ~20dB above 10kHz and degrades PSRR above 100kHz. A 0.1µF X7R ceramic capacitor to GND is recommended to stabilize the bandgap reference and reduce high-frequency noise coupling into sensitive analog circuits.
How does the AP131-33WL-7 behave during thermal shutdown, and how is recovery handled?
When junction temperature exceeds ~150°C, thermal shutdown disables the pass transistor, dropping output to near zero. The device remains latched off until temperature falls by ~20°C (hysteresis), then automatically resumes regulation without needing EN toggling-ensuring safe self-recovery after transient overload or poor heatsinking.
Is AP131-33WL-7 qualified for automotive applications, and what AEC-Q200 stress tests has it passed?
No, AP131-33WL-7 is not AEC-Q200 qualified. It is rated for industrial temperature range (-40°C to +85°C ambient), with no qualification testing for automotive-grade vibration, humidity, or extended temperature cycling. For automotive use, Diodes recommends the AEC-Q100 qualified AP7361 series instead.
AP131-33WL-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 0.5V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (100Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP131-33WL-7 FAQ
1.How can I place an order for AP131-33WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP131-33WL-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 AP131-33WL-7 reliable?
The price and inventory of AP131-33WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-33WL-7 is usually 5 days.
3.What payment methods are accepted for AP131-33WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-33WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP131-33WL-7?
AP131-33WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP131-33WL-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 AP131-33WL-7?
For technical support, including AP131-33WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-33WL-7 requirements.
6.How does Aetrix verify that AP131-33WL-7 is sourced from the original manufacturer or authorized distributors?
All AP131-33WL-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 AP131-33WL-7 meets industry standards.
7.What is the process for return or replacement of AP131-33WL-7?
All AP131-33WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-33WL-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 AP131-33WL-7 part is unused and in its original packaging.
Return procedure for AP131-33WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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