My Inquiry
My Account
Diodes Incorporated AP131-33WG-7
- Part No.:
- AP131-33WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP131-33WG-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP131-33WG-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 limiting, 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 AP131-33WG-7 datasheet, AP131-33WG-7 pinout, AP131-33WG-7 application, or AP131-33WG-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 ambient-limited designs.
Technical Context
The AP131-33WG-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 with <35mV load regulation over 1–300mA.
Shutdown is controlled via active-low EN pin with <0.1µA leakage and 8µs delay (CBP = 0.1µF). The BP pin connects an external capacitor to suppress high-frequency output noise, improving PSRR to 60dB at 100Hz while maintaining fast transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy ensures reliable logic-level compatibility with 3.3V microcontrollers and I/O interfaces. |
| Dropout Voltage | 400mV typ. at 300mA enables operation down to VIN = 3.7V-critical for single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 50µA typ. at no load minimizes standby power loss in always-on battery applications like IoT sensors. |
| Enable Threshold | VENON ≥1.5V guarantees robust turn-on even with weak GPIO drivers; VENOFF ≤0.8V ensures clean shutdown. |
| Thermal Protection | Internal thermal shutdown activates at TJ >125°C, preventing damage during sustained overload or poor PCB heatsinking. |
| PSRR | 60dB at 100Hz suppresses ripple from noisy DC-DC pre-regulators, reducing need for additional filtering. |
Pinout & Package
SOT25 package: 5-pin surface-mount, 2.8mm × 2.9mm footprint, 1.1mm height, RoHS-compliant "Green" molding compound (Br/Cl <900ppm, Sb <1000ppm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Input voltage supply | Accepts 2.7–5.5V; requires 1µF ceramic input capacitor for stability and ESR <100mΩ. |
| 2: EN | Active-low enable control | Pulled high internally; drives low (<0.8V) to disable regulator and reduce ground current to 5µA. |
| 3: BP | Bandgap reference bypass | Connects 0.1µF capacitor to reduce output noise and improve PSRR above 10kHz. |
| 4: OUT | Regulated output | Delivers up to 300mA at 3.3V; requires 10µF low-ESR output capacitor for transient response. |
| 5: GND | Power and signal reference | Shared return path for IN, OUT, and BP; must be low-impedance plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Low-quiescent-current LDO | 50µA IQ enables >1-year battery life in 10µA average-load IoT endpoints using CR2032 cells. |
| PMOS pass transistor | 1.5Ω RON eliminates base drive loss and supports zero-current shutdown mode. |
| Integrated protection | Current foldback + thermal shutdown prevent latch-up during short-circuit events without external components. |
| BP pin noise suppression | 0.1µF BP capacitor reduces output voltage noise by >20dB, critical for RF and ADC reference supplies. |
Applications
| Battery-Powered Wireless Sensor Node | USB-Powered Peripheral Interface |
|---|---|
Use Scenario: Compact BLE/Wi-Fi sensor node powered by CR2032 or single-cell Li-ion with intermittent transmit bursts. IC Role / Device Role / Timing Role: Primary 3.3V supply for MCU, radio transceiver, and analog front-end; enables ultra-low-power sleep mode via EN pin. Use Value: 50µA quiescent current extends shelf life; 400mV dropout allows operation until battery reaches 3.7V, maximizing usable capacity. | Use Scenario: USB 2.0 hub or card reader requiring clean 3.3V rail from noisy 5V USB VBUS. IC Role / Device Role / Timing Role: Post-regulator filtering noise from upstream DC-DC converter or USB switch; supplies USB PHY and controller logic. Use Value: 60dB PSRR at 100Hz attenuates switching ripple; BP pin capacitor further suppresses high-frequency noise affecting USB signal integrity. |
| Industrial Control I/O Module | Embedded Display Backlight Driver Support |
Use Scenario: DIN-rail mounted PLC I/O module with isolated 3.3V logic supply derived from 12–24V DC input. IC Role / Device Role / Timing Role: Local regulation for microcontroller, CAN transceiver, and digital isolator side; EN pin used for fault-initiated shutdown. Use Value: Thermal shutdown protects against enclosure overheating; ±2% output accuracy ensures reliable logic level margins across -40°C to +85°C ambient. | Use Scenario: Small-form-factor LCD display with LED backlight driven by PWM dimming IC requiring stable 3.3V bias. IC Role / Device Role / Timing Role: Dedicated low-noise supply for backlight driver's analog reference and gate-drive circuitry. Use Value: BP pin decoupling reduces output noise to <100µVRMS, preventing visible flicker or color shift in PWM-dimmed LEDs. |
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 output, lower 250mV dropout, but 65µA IQ and no BP pin. | Better for higher-current loads; lacks BP noise suppression for sensitive analog rails. | Select when load exceeds 300mA or dropout margin is critical; avoid where BP-controlled noise performance is required. |
| MCP1700-3302E/TO | 300mA output, 600mV dropout, 1.8µA IQ, TO-92 package, no EN or BP pins. | Ultra-low IQ suits multi-year battery use; through-hole package limits board density and thermal performance. | Select for cost-sensitive, low-power, non-space-constrained designs; avoid for SMT-only or thermally demanding layouts. |
Compared with AP7343-33W5-7 and MCP1700-3302E/TO, the AP131-33WG-7 uniquely balances low IQ, integrated EN control, BP noise filtering, and SOT25 thermal performance-making it optimal for compact, battery-powered systems needing regulated 3.3V with design flexibility.
Availability
AP131-33WG-7 is available at Aetrix Electronics and suitable for battery-powered wireless sensor nodes, USB-powered peripheral interfaces, and industrial control I/O modules requiring stable component supply with consistent parametric performance and RoHS/Green compliance.
Supply support for AP131-33WG-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 belongs to Diodes' precision LDO portfolio, engineered specifically for space-constrained, low-power applications where dropout voltage, quiescent current, and noise performance directly impact system runtime and signal fidelity.
FAQ
What is the minimum input voltage required for AP131-33WG-7 to maintain regulation at 300mA load?
The minimum input voltage is VOUT + VDROP = 3.3V + 0.4V = 3.7V. At 300mA load and 25°C, dropout is typically 400mV; derating is recommended for elevated temperatures or worst-case tolerance, so 3.8V is advised for robust design margin.
Can the BP pin be left unconnected, and what is its function?
Yes, the BP pin may be left floating, but doing so forfeits noise-reduction benefits. When connected to a 0.1µF ceramic capacitor to GND, BP stabilizes the internal bandgap reference, lowering output voltage noise by up to 20dB and improving PSRR above 10kHz-critical for RF and precision analog circuits.
Does AP131-33WG-7 support reverse polarity protection on the input?
No, the AP131-33WG-7 lacks built-in reverse-polarity protection. Applying reversed input voltage may damage the internal PMOS pass device. An external series Schottky diode or ideal diode controller is required if reverse input is possible in the application.
How does thermal shutdown behave during continuous overload?
Under sustained overload, junction temperature rises until thermal shutdown activates at ~125°C, turning off the pass device. After cooldown (~20–30°C below trip point), the device auto-restarts. This cycle repeats, limiting average power dissipation and preventing permanent damage-no external reset is needed.
AP131-33WG-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
AP131-33WG-7 FAQ
1.How can I place an order for AP131-33WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP131-33WG-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 AP131-33WG-7 reliable?
The price and inventory of AP131-33WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-33WG-7 is usually 5 days.
3.What payment methods are accepted for AP131-33WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-33WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP131-33WG-7?
AP131-33WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP131-33WG-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 AP131-33WG-7?
For technical support, including AP131-33WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-33WG-7 requirements.
6.How does Aetrix verify that AP131-33WG-7 is sourced from the original manufacturer or authorized distributors?
All AP131-33WG-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 AP131-33WG-7 meets industry standards.
7.What is the process for return or replacement of AP131-33WG-7?
All AP131-33WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-33WG-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 AP131-33WG-7 part is unused and in its original packaging.
Return procedure for AP131-33WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP131-33WG-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.…
