My Inquiry
My Account
Diodes Incorporated AP131-18WG-7
- Part No.:
- AP131-18WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP131-18WG-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,127
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP131-18WG-7 from Diodes Incorporated is a 300mA fixed-output (1.8V) 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-voltage supply.
For engineers reviewing the AP131-18WG-7 datasheet, AP131-18WG-7 pinout, AP131-18WG-7 application, or AP131-18WG-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 AP131-18WG-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 output voltage with <35mV load regulation (1–300mA) and <0.3%/V line regulation.
Shutdown is implemented via an active-low EN pin controlling internal biasing; fast enable delay (8µs typical with 0.1µF BP capacitor) supports dynamic power sequencing. The BP pin connects to an external 0.1µF capacitor to reduce output noise, improving PSRR to 60dB at 100Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - ensures stable core voltage for 1.8V I/O domains in microcontrollers and RF ICs |
| Max Output Current | 300mA - sufficient to power single-core MCUs or low-power transceivers without external boost |
| Dropout Voltage | 400mV @ 300mA - enables operation down to 2.2V input, critical for single-cell Li-ion or Li-poly systems |
| Quiescent Current | 50µA @ no load - minimizes standby drain in always-on sensor nodes or wake-on-event circuits |
| PSRR | 60dB @ 100Hz - suppresses switching noise from adjacent DC-DC converters in mixed-signal PCBs |
| Enable Threshold | VENON ≥1.5V, VENOFF ≤0.8V - compatible with 1.8V/3.3V GPIO without level-shifting |
| Thermal Resistance | θJA = 163°C/W - requires minimal copper area for thermal relief in space-constrained SOT25 layouts |
Pinout & Package
SOT25 (5-pin, lead-free, halogen-free "Green" package; 3.0mm × 1.6mm footprint, 1.1mm height; JEDEC MO-178 variant). Thermal pad not present; standard FR-4 mounting with 2oz copper recommended.
| 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 internally; drives low to disable regulator and reduce ground current to ≤5µA |
| 3 (BP) | Bandgap bypass node | Connects to 0.1µF capacitor to filter reference noise and improve PSRR |
| 4 (OUT) | Regulated output | Delivers 1.8V ±2%; requires 10µF output capacitor (low-ESR ceramic) for transient response |
| 5 (GND) | Power ground reference | Common return for IN, OUT, EN, and BP; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout architecture | 400mV @ 300mA enables use with single-cell batteries down to 2.2V under full load |
| Ultra-low quiescent current | 50µA across 0–300mA load range preserves battery life in sleep-mode IoT endpoints |
| Integrated protection | Current limit (350–450mA) and thermal shutdown prevent damage during short-circuit or overload |
| BP pin noise filtering | External 0.1µF capacitor on BP reduces output voltage ripple by enhancing reference stability |
| High accuracy output | ±2% initial tolerance and <150ppm/°C drift ensure reliable logic-level compliance across –40°C to +85°C |
Applications
| Battery-Powered Wireless Sensor Node | USB-Powered Peripheral Interface |
|---|---|
Use Scenario: Compact BLE/Wi-Fi module powered by coin cell or single Li-ion battery with intermittent transmit bursts. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying RF transceiver and MCU I/O domain; enabled only during active communication. Use Value: 50µA quiescent current extends shelf life; 400mV dropout allows >90% depth-of-discharge utilization of 3.0V nominal cells. | Use Scenario: USB 2.0 hub or card reader requiring clean 1.8V for PHY termination and controller I/O. IC Role / Device Role / Timing Role: Post-regulator after 5V-to-3.3V conversion, delivering low-noise 1.8V to high-speed digital interfaces. Use Value: 60dB PSRR at 100Hz suppresses USB switcher ripple; ±2% accuracy guarantees signal integrity on 1.8V LVCMOS buses. |
| Industrial PLC Digital Input Module | Embedded Camera Interface Power |
Use Scenario: DIN-rail mounted sensor interface board operating from 24V rail with isolated DC-DC and local LDO stages. IC Role / Device Role / Timing Role: Final-stage regulator for 1.8V FPGA configuration memory and level translators in harsh EMI environments. Use Value: Thermal shutdown (125°C TJ) prevents latch-up in enclosed enclosures; SOT25 footprint simplifies layout near isolation barriers. | Use Scenario: MIPI CSI-2 camera module in portable medical or inspection equipment with strict EMI limits. IC Role / Device Role / Timing Role: Dedicated 1.8V supply for image sensor I/O and serializer IC, decoupled via BP capacitor. Use Value: BP pin filtering reduces jitter on clock/data lanes; 35mV load regulation maintains timing margin across frame-rate changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-18SAG-7 | Higher PSRR (70dB @ 100Hz), lower dropout (250mV @ 300mA), but no BP pin | Better noise rejection in ultra-sensitive analog sections; lacks BP-based noise tuning flexibility | Select when PSRR >65dB is mandatory and BP functionality is unnecessary |
| MCP1700-1802E/TO | Lower IQ (2µA), same 1.8V output, but only 250mA rated; TO-92 package | Superior battery life in deep-sleep applications; limited current capacity and larger through-hole footprint | Select for ultra-low-power, low-current (<200mA) designs where board space and thermal density are secondary |
Compared with AP7343-18SAG-7 and MCP1700-1802E/TO, the AP131-18WG-7 uniquely balances 300mA capability, BP-adjustable noise performance, and SOT25 thermal efficiency-making it optimal for compact, moderate-power embedded systems needing design flexibility.
Availability
AP131-18WG-7 is available at Aetrix Electronics and suitable for battery-powered wireless sensors, USB peripheral interfaces, and industrial digital input modules requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for AP131-18WG-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP131 series belongs to Diodes' precision LDO portfolio, engineered for low-noise, low-quiescent-current regulation in space-constrained, battery-sensitive applications-emphasizing reliability, thermal robustness, and ease of integration.
FAQ
What is the minimum input voltage required for AP131-18WG-7 to maintain regulated 1.8V output at 300mA?
The minimum input voltage is 2.2V, calculated as VOUT + VDROP = 1.8V + 0.4V. Below this, output voltage drops linearly with input; operation below 2.7V is outside recommended conditions per datasheet Section 5.
Can the BP pin be left unconnected, and what impact does that have on performance?
Yes, the BP pin may be left floating or tied directly to OUT, but doing so degrades PSRR by ~15–20dB at 100Hz and increases output noise. For optimal noise suppression, a 0.1µF X7R ceramic capacitor must connect BP to GND per Figure 1 and Section 7.2.
Does AP131-18WG-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 can damage the PMOS pass transistor. External series diode or ideal diode controller is required for reverse-polarity resilience.
How does thermal shutdown behave during sustained overload, and is automatic recovery supported?
Thermal shutdown activates at ~150°C junction temperature, disabling output until TJ falls below ~135°C hysteresis. Recovery is fully automatic and does not require cycling EN; however, repeated cycling indicates inadequate PCB copper area or excessive ambient temperature.
AP131-18WG-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):
- 1.8V
- 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
AP131-18WG-7 FAQ
1.How can I place an order for AP131-18WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP131-18WG-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 AP131-18WG-7 reliable?
The price and inventory of AP131-18WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-18WG-7 is usually 5 days.
3.What payment methods are accepted for AP131-18WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-18WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP131-18WG-7?
AP131-18WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP131-18WG-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 AP131-18WG-7?
For technical support, including AP131-18WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-18WG-7 requirements.
6.How does Aetrix verify that AP131-18WG-7 is sourced from the original manufacturer or authorized distributors?
All AP131-18WG-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 AP131-18WG-7 meets industry standards.
7.What is the process for return or replacement of AP131-18WG-7?
All AP131-18WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-18WG-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 AP131-18WG-7 part is unused and in its original packaging.
Return procedure for AP131-18WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP131-18WG-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.…
