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Diodes Incorporated AP131-20WL-7
- Part No.:
- AP131-20WL-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP131-20WL-7.pdf
- Description:
- IC REG LINEAR 2V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,991
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Product details
Overview
AP131-20WL-7 from Diodes Incorporated is a 300mA fixed-output (2.0V) low-dropout linear regulator in SOT25 package, featuring 400mV dropout at full load, 50µA quiescent current, and active-low enable control. It integrates current limiting, thermal shutdown, and bandgap reference with BP pin for noise reduction-designed for battery-powered wireless modules and PC peripherals requiring stable low-voltage bias.
For engineers reviewing the AP131-20WL-7 datasheet, AP131-20WL-7 pinout, AP131-20WL-7 application, or AP131-20WL-7 equivalent, key selection criteria include dropout voltage under 300mA load, ±2% output accuracy across temperature, EN pin logic thresholds (VENON ≥1.5V), and SOT25 thermal resistance (θJA = 163°C/W) for compact board layout.
Technical Context
The AP131-20WL-7 uses 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 VOUT = 2.0V with ±2% initial accuracy and 50ppm/°C drift.
Shutdown is controlled via active-low EN pin (VENOFF ≤0.8V), with <0.1µA enable leakage and 8µs delay when CBP = 0.1µF. Protection includes foldback short-circuit current (150–300mA) and thermal shutdown triggered at TJ >125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0V ±2% at 1mA, ensuring stable core/bias rail for 2.0V logic or analog circuitry |
| Dropout Voltage | 400mV typ. at 300mA, enabling operation down to VIN = 2.4V while maintaining regulation |
| Quiescent Current | 50µA typ. from zero to full load, minimizing battery drain in always-on standby modes |
| PSRR | 60dB at 100Hz, suppressing ripple from noisy DC-DC pre-regulators in mixed-signal systems |
| Thermal Resistance | θJA = 163°C/W (SOT25), defining max power dissipation (250mW @ TA=25°C) before derating |
| Enable Threshold | VENOFF ≤0.8V ensures reliable disable with standard GPIO logic low; VENON ≥1.5V supports 3.3V/5V host control |
| Short-Circuit Current | Foldback-limited to 150–300mA, preventing thermal runaway during output fault conditions |
Pinout & Package
SOT25 (5-pin, lead-free, halogen-free "Green" package; 2.8mm × 2.9mm footprint, 1.1mm height). Thermal pad not present; standard FR-4 mounting with recommended 2oz copper pads per Diodes Inc. outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Input supply connection | Accepts 2.7–5.5V input; requires 1µF ceramic bypass capacitor close to pin |
| 2: EN | Active-low enable control | Pulled high internally; driven low (<0.8V) to disable regulator and reduce IQ to 5µA |
| 3: BP | Bandgap reference bypass | 0.1µF capacitor reduces output noise and improves PSRR stability |
| 4: OUT | Regulated output | Delivers up to 300mA at 2.0V; requires 10µF low-ESR output capacitor |
| 5: GND | Power ground reference | Common return for IN, OUT, BP, and EN; must be low-impedance plane for stability |
Key Features
| Feature | Design Value |
|---|---|
| Low quiescent current | 50µA over full load range enables >1-year battery life in 10µA sleep-mode IoT sensors |
| Fast transient response | Stabilizes within microseconds after load step changes, critical for burst-mode RF transceivers |
| Integrated protection | Current limit + thermal shutdown prevent latch-up or destruction during sustained overload or PCB overheating |
| BP pin noise filtering | External 0.1µF capacitor on BP reduces output voltage noise by >20dB, improving ADC reference stability |
| High accuracy output | ±2% tolerance at 25°C and tight load regulation (30mV over 1–300mA) ensure consistent logic-level compatibility |
Applications
| Wireless Sensor Node | USB Peripheral Power |
|---|---|
Use Scenario: Compact BLE/Wi-Fi sensor node powered by single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 2.0V LDO supplying MCU core and RF transceiver bias rails. Use Value: 400mV dropout extends usable battery range down to 2.4V; 50µA IQ preserves shelf life. | Use Scenario: USB 2.0 hub IC requiring clean 2.0V auxiliary supply from 3.3V bus. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noise from shared USB VBUS. Use Value: 60dB PSRR at 100Hz suppresses switching noise from upstream DC-DC converter. |
| Industrial I/O Module | Embedded Display Backlight Control |
Use Scenario: DIN-rail mounted PLC I/O module with isolated 2.0V logic interface. IC Role / Device Role / Timing Role: Post-isolation LDO generating isolated 2.0V for digital isolator side and level-shifters. Use Value: ±2% output accuracy ensures reliable logic threshold margin across -40°C to +85°C ambient. | Use Scenario: Small-form-factor LCD display with LED driver IC requiring precise 2.0V reference. IC Role / Device Role / Timing Role: Reference voltage source for current-sense amplifier in constant-current LED string. Use Value: BP pin filtering minimizes noise coupling into analog current sense path, reducing brightness flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-20SAG-7 | Higher PSRR (70dB @100Hz), lower dropout (300mV @300mA), but no BP pin | Better for ultra-low-noise analog rails; lacks BP-based noise tuning flexibility | Select when PSRR >65dB is mandatory and external noise filtering suffices |
| MCP1700T-2002E/TT | Lower IQ (2µA), same 2.0V output, but only 250mA rated output and no thermal shutdown | Ideal for long-life coin-cell devices; unsuitable for sustained 300mA loads or hot environments | Select for ultra-low-power, low-current applications where thermal safety is externally managed |
Compared with AP7343-20SAG-7 and MCP1700T-2002E/TT, the AP131-20WL-7 uniquely balances 300mA capability, integrated thermal protection, and BP-adjustable noise performance-making it optimal for space-constrained industrial and wireless designs needing robustness and flexibility.
Availability
AP131-20WL-7 is available at Aetrix Electronics and suitable for battery-powered devices, wireless communication modules, and PC peripheral designs requiring stable component supply with RoHS-compliant, green packaging.
Supply support for AP131-20WL-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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP131 series targets cost-sensitive, space-constrained applications demanding low-IQ, fixed-output LDOs with integrated protection-optimized for portable electronics and embedded peripherals where simplicity and robustness are prioritized over programmability.
FAQ
What is the minimum input voltage required for AP131-20WL-7 to maintain 2.0V output at 300mA?
The minimum input is 2.4V, calculated as VOUT + VDROP = 2.0V + 0.4V (typical dropout). At 25°C with proper PCB layout and CIN/COUT, regulation holds down to this voltage; below 2.4V, output drops linearly with input.
Can the BP pin be left unconnected, and what impact does that have?
Yes, BP can be left floating or tied directly to OUT, but doing so increases output noise and degrades PSRR by ~15–20dB at 10kHz–100kHz. For noise-sensitive analog circuits, a 0.1µF X7R capacitor between BP and GND is strongly recommended per datasheet Figure 10.
Does AP131-20WL-7 support reverse polarity protection on the IN pin?
No. The device lacks internal reverse-voltage protection. Applying negative voltage to IN relative to GND may damage the PMOS pass transistor. External series diode or ideal diode controller is required if reverse input is possible in the system.
How does thermal shutdown behave during continuous overload?
When junction temperature exceeds ~150°C, thermal shutdown disables the pass element, dropping OUT to near 0V. After cooldown (~10–30s depending on PCB thermal mass), the device auto-restarts. This hiccup mode prevents permanent damage but causes intermittent output-designers must size heatsinking or limit duty cycle accordingly.
AP131-20WL-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):
- 2V
- 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
AP131-20WL-7 FAQ
1.How can I place an order for AP131-20WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP131-20WL-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 AP131-20WL-7 reliable?
The price and inventory of AP131-20WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-20WL-7 is usually 5 days.
3.What payment methods are accepted for AP131-20WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-20WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP131-20WL-7?
AP131-20WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP131-20WL-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 AP131-20WL-7?
For technical support, including AP131-20WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-20WL-7 requirements.
6.How does Aetrix verify that AP131-20WL-7 is sourced from the original manufacturer or authorized distributors?
All AP131-20WL-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 AP131-20WL-7 meets industry standards.
7.What is the process for return or replacement of AP131-20WL-7?
All AP131-20WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-20WL-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 AP131-20WL-7 part is unused and in its original packaging.
Return procedure for AP131-20WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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