Diodes Incorporated AP130-18SAG-7

Overview

AP130-18SAG-7 from Diodes Incorporated is a fixed 1.8V, 300mA low-dropout linear regulator in SOT23 package with 400mV dropout at full load, 50µA quiescent current, and ±2% output voltage accuracy-designed for battery-powered wireless modules and PC peripherals requiring stable low-voltage bias.

For engineers reviewing the AP130-18SAG-7 datasheet, AP130-18SAG-7 pinout, AP130-18SAG-7 application, or AP130-18SAG-7 equivalent, key selection criteria include dropout performance at 300mA, thermal shutdown behavior under sustained load, GND current vs. input voltage profile, and compatibility with 1µF/10µF input/output capacitor configuration.

Technical Context

The AP130-18SAG-7 integrates a PMOS pass element with R_ON = 1.5Ω, error amplifier, bandgap reference, and thermal shutdown circuitry. Its internal architecture eliminates base current draw and enables fast transient response with minimal external components.

It operates across 2.7V–5.5V input range and maintains regulation down to 1.8V + 400mV (2.2V min VIN) at 300mA. Load regulation is ±30mV over 1–300mA, and PSRR reaches 58dB at 100Hz with specified 1µF/10µF capacitors.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, RoHS-compliant green molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MCP1700-1802E/TO and TPS7A0518PDBVR, the AP130-18SAG-7 uniquely delivers 300mA at 400mV dropout with 50µA IQ in a cost-optimized SOT23 package-making it optimal for mid-power portable applications where both current headroom and efficiency matter.

Availability

AP130-18SAG-7 is available at Aetrix Electronics and suitable for battery-powered devices, PC peripherals, and wireless communication modules requiring stable component supply with consistent parametric performance across production lots.

Supply support for AP130-18SAG-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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.

The AP130 series belongs to Diodes' precision LDO portfolio targeting portable and embedded systems; it was engineered specifically to balance low dropout, ultra-low quiescent current, and robust protection in compact packages.

FAQ

What is the minimum input voltage required for AP130-18SAG-7 to maintain regulation at 300mA?

The minimum input voltage is 2.2V, calculated as V_OUT + V_DROP = 1.8V + 0.4V. This allows operation from partially discharged single-cell Li-ion batteries (down to 2.2V) or two-cell alkaline sources. Below 2.2V, output voltage drops linearly with input.

Can AP130-18SAG-7 be used without an output capacitor?

No. A minimum 10µF low-ESR ceramic capacitor is mandatory between OUT and GND to ensure loop stability and prevent oscillation. Omitting it causes sustained ringing or instability under load transients, per functional description on page 5 of DS31027.

Does AP130-18SAG-7 include reverse polarity protection?

No. The device lacks internal reverse-battery protection. If input polarity reversal is possible in the system, an external series Schottky diode or MOSFET-based protection circuit must be added to prevent damage to the IN pin.

How does thermal shutdown behave during continuous 300mA operation at +85°C ambient?

With θ_JA = 200°C/W and P_D ≈ (V_IN−1.8V)×0.3A, junction temperature rises ~30°C above ambient at V_IN = 3.3V. Shutdown triggers only if ambient exceeds ~95°C or board layout degrades thermal resistance significantly.