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Diodes Incorporated AP131-25WG-7
- Part No.:
- AP131-25WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP131-25WG-7.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP131-25WG-7 from Diodes Incorporated is a 300mA fixed-output (2.5V) 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 AP131-25WG-7 datasheet, AP131-25WG-7 pinout, AP131-25WG-7 application, or AP131-25WG-7 equivalent, key selection criteria include dropout voltage at 300mA, ±2% output accuracy over temperature, EN pin logic thresholds (VENON ≥1.5V, VENOFF ≤0.8V), and SOT25 thermal resistance (θJA = 163°C/W).
Technical Context
The AP131-25WG-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 a trimmed bandgap reference to regulate output within ±2% across -40°C to +85°C ambient.
Shutdown is implemented via an active-low EN pin with sub-0.1µA leakage; enabling triggers fast turn-on (8µs delay with 0.1µF BP capacitor). Internal current fold-back and thermal shutdown protect against short-circuit and overload faults without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures precise rail generation for 2.5V logic or analog circuitry |
| Dropout Voltage | 400mV typ. at 300mA - supports operation down to 2.9V input when regulating 2.5V output |
| Quiescent Current | 50µA typ. - minimizes battery drain in always-on standby modes |
| Enable Threshold | VENON ≥1.5V, VENOFF ≤0.8V - compatible with 1.8V/3.3V GPIO without level-shifting |
| PSRR | 60dB at 100Hz - suppresses ripple from noisy DC-DC pre-regulators |
| Thermal Resistance | θJA = 163°C/W - limits junction rise to ~49°C above ambient at 300mA in still air |
| Short-Circuit Current | 150–300mA fold-back - sustains safe power dissipation during output fault |
Pinout & Package
SOT25 (5-pin, lead-free, halogen-free "Green" package) with 1.6mm × 2.9mm footprint and 1.1mm height. Exposed 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 voltage supply | Accepts 2.7–5.5V; requires 1µF ceramic input capacitor for stability |
| 2 (EN) | Active-low enable control | Pulled high to enable regulator; <0.1µA leakage enables direct MCU GPIO drive |
| 3 (BP) | Bandgap bypass | 0.1µF capacitor reduces output noise and improves PSRR at high frequencies |
| 4 (OUT) | Regulated output | Delivers up to 300mA at 2.5V ±2%; requires 10µF output capacitor |
| 5 (GND) | Power ground reference | Common return for IN, OUT, EN, and BP; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Low quiescent current | 50µA typical across 0–300mA load - extends battery life in portable devices |
| Fast enable response | 8µs turn-on delay with 0.1µF BP cap - meets timing requirements of burst-mode systems |
| Integrated protection | Current limit + thermal shutdown - eliminates need for external fault-handling circuitry |
| Noise-reduction BP pin | 0.1µF capacitor lowers output noise floor and improves PSRR by >10dB above 10kHz |
| High accuracy output | ±2% initial tolerance over line/load/temperature - avoids post-regulation trimming |
Applications
| Wireless Sensor Node | USB Peripheral Power |
|---|---|
Use Scenario: Compact BLE or Zigbee node powered by single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying RF transceiver and microcontroller core logic. Use Value: 400mV dropout allows >30% longer runtime below 3.0V input vs. legacy 600mV-dropout regulators. | Use Scenario: External USB audio interface drawing peak 250mA from 5V bus. IC Role / Device Role / Timing Role: Local 2.5V rail for DAC and op-amp stage, isolated from USB port noise. Use Value: 60dB PSRR at 100Hz rejects switching noise from upstream DC-DC converter. |
| Laptop Card Reader | Industrial Data Logger |
Use Scenario: SD card slot on ultrabook motherboard with dynamic sleep/wake cycles. IC Role / Device Role / Timing Role: Enable-controlled 2.5V supply to SDIO interface, powered only during card access. Use Value: Sub-0.1µA shutdown current prevents µA-level leakage during multi-day suspend states. | Use Scenario: Battery-backed environmental sensor node logging data every 10 minutes. IC Role / Device Role / Timing Role: Always-on 2.5V bias for precision ADC reference and real-time clock. Use Value: ±2% output accuracy ensures consistent 12-bit ADC full-scale calibration across -40°C to +70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-25W5-7 | Higher 500mA rating, 300mV dropout at 300mA, no BP pin | Better suited for higher-current loads; lacks BP-based noise filtering | Select when >300mA output or lower dropout is required, and noise sensitivity is low |
| MCP1700-2502E/TO | 250mA rating, 175mV dropout at 250mA, 3µA quiescent current | Ultra-low IQ ideal for decades-long battery life; lower current capability | Select for ultra-low-power applications where 250mA max load is sufficient |
Compared with AP7343-25W5-7 and MCP1700-2502E/TO, the AP131-25WG-7 balances mid-range current delivery, BP-enabled noise suppression, and robust fault protection-making it optimal for cost-sensitive, noise-sensitive 2.5V systems needing 300mA with moderate IQ.
Availability
AP131-25WG-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripherals, laptop card readers, and industrial data loggers requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for AP131-25WG-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 space-constrained, battery-operated applications demanding low dropout, low IQ, and integrated fault protection without external components.
FAQ
What is the minimum input voltage required for stable 2.5V output at 300mA?
The AP131-25WG-7 requires VIN ≥ VOUT + VDROP = 2.5V + 0.4V = 2.9V for stable regulation at full load. Below 2.9V, output voltage drops linearly with input; operation below 2.7V is outside recommended conditions and may cause shutdown or unregulated behavior.
Can the BP pin be left unconnected?
Yes, the BP pin may be left floating or tied directly to GND if noise performance is not critical. However, connecting a 0.1µF ceramic capacitor between BP and GND improves PSRR by up to 15dB above 10kHz and reduces output voltage noise-recommended for analog or RF-sensitive designs.
Does the AP131-25WG-7 require an external pull-up resistor on the EN pin?
No external pull-up is required. The EN pin has no internal pull-up; system-level logic must actively drive it high (≥1.5V) to enable regulation. In most MCU-based designs, a GPIO configured as push-pull output suffices-no external resistor needed unless open-drain control is used.
How does thermal shutdown activate under overload?
Thermal shutdown triggers when junction temperature exceeds +150°C, disabling the pass element until temperature falls below +135°C (typical hysteresis). During sustained overload, the device cycles on/off-limiting average power dissipation and preventing permanent damage without requiring external thermal monitoring.
AP131-25WG-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):
- 2.5V
- 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
AP131-25WG-7 FAQ
1.How can I place an order for AP131-25WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP131-25WG-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 AP131-25WG-7 reliable?
The price and inventory of AP131-25WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-25WG-7 is usually 5 days.
3.What payment methods are accepted for AP131-25WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-25WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP131-25WG-7?
AP131-25WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP131-25WG-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 AP131-25WG-7?
For technical support, including AP131-25WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-25WG-7 requirements.
6.How does Aetrix verify that AP131-25WG-7 is sourced from the original manufacturer or authorized distributors?
All AP131-25WG-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 AP131-25WG-7 meets industry standards.
7.What is the process for return or replacement of AP131-25WG-7?
All AP131-25WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-25WG-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 AP131-25WG-7 part is unused and in its original packaging.
Return procedure for AP131-25WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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