Diodes Incorporated AP1119Y50L-13

Overview

AP1119Y50L-13 from Anachip Corp. is a 0.5A positive low-dropout fixed-output linear regulator in SOT89-5L package, delivering a stable 5.0V output with ≤1.3V dropout at full load, ±2% output voltage accuracy, and TTL/CMOS-compatible enable control. It supports input voltages up to 18V and is designed for low-noise, high-stability power supply in bus termination and 3.3V/5V logic rails.

For engineers reviewing the AP1119Y50L-13 datasheet, AP1119Y50L-13 pinout, AP1119Y50L-13 application, or AP1119Y50L-13 equivalent, key selection criteria include dropout voltage under 0.5A load, thermal shutdown behavior, EN logic polarity, output stability with 10µF minimum ceramic/tantalum output capacitance, and SOT89-5L thermal resistance (θ_JA = 300°C/W).

Technical Context

The AP1119Y50L-13 integrates a PNP pass transistor with internal current limiting and thermal shutdown circuitry, operating as a fixed-mode LDO without external feedback components. Its enable input features an internal ~100kΩ pull-down resistor, requiring logic-low (≤0.8V) to activate regulation and logic-high (≥2.0V) to disable output.

Designed for low-voltage IC supply, it maintains regulation across 0–125°C junction temperature with <0.5% temperature-induced output drift and delivers 60–70dB ripple rejection at 120Hz when V_IN = V_OUT + 3V. Load regulation is specified at 40–50mV over 0–0.5A at 5.0V output.

Key Specifications

Pinout & Package

SOT89-5L package with exposed tab electrically connected to V_OUT; requires minimum 10µF output capacitor between V_OUT and GND for stability. Tab must be thermally connected to PCB copper for heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29501-5.0WT and TPS76350DBVR, AP1119Y50L-13 uniquely balances 0.5A capability, SOT89-5L thermal performance, and 1.3V dropout in a lead-free, production-ready package-making it optimal for cost-sensitive, medium-current embedded 5V supplies where new design adoption is still viable despite "Not Recommended for New Design" status.

Availability

AP1119Y50L-13 is available at Aetrix Electronics and suitable for PC peripheral power, communication interface supply, and VGA card core logic requiring stable component supply with verified thermal performance and enable-controlled sequencing.

Supply support for AP1119Y50L-13 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

Anachip Corp. is a Taiwan-based analog and power management IC designer founded in 1996, specializing in cost-optimized linear regulators, LED drivers, and protection devices for consumer and industrial markets.

The AP1119 series targets legacy and cost-driven embedded systems needing reliable, fixed-output LDOs with integrated enable and thermal protection-particularly where SOT89-5L's thermal-electrical balance outperforms smaller packages under sustained 0.5A loads.

FAQ

What is the minimum input voltage required for AP1119Y50L-13 to regulate 5.0V output?

The device requires V_IN ≥ V_OUT + 1.3V to maintain regulation at full 0.5A load, so minimum valid input is 6.3V. At lighter loads, dropout decreases-e.g., ~0.4V at 100mA-allowing operation down to ~5.4V while retaining regulation, per typical performance curves.

Can AP1119Y50L-13 be used with ceramic output capacitors?

Yes, but stability must be verified: the datasheet specifies 10µF minimum with ESR ≥ 0.1Ω. Standard X5R/X7R ceramics often have ESR < 0.05Ω and may cause oscillation; adding a 0.1–1Ω series resistor or using hybrid (ceramic + tantalum) output networks is recommended for robustness.

Is the exposed tab on SOT89-5L electrically connected, and how should it be handled?

Yes-the tab is internally bonded to V_OUT, not GND. It must be soldered to a dedicated V_OUT-referenced copper pour for thermal conduction. Connecting it to ground or another net creates a short; isolation from adjacent traces is essential to prevent arcing at 18V max input.

Why does the datasheet state "Not Recommended for New Design"?

This reflects Anachip's product lifecycle policy: AP1119 is mature and functionally superseded by newer LDO families (e.g., AP21xx series) with lower dropout, higher PSRR, and smaller packages. However, AP1119Y50L-13 remains fully qualified, in active production, and supported for existing designs and cost-sensitive replacements where its 0.5A/SOT89-5L trade-off remains optimal.