Diodes Incorporated AP1086D50L-U

Overview

AP1086D50L-U from Diodes Incorporated is a 1.5A low dropout (LDO) positive fixed-mode voltage regulator delivering a precise 5.0V output with ≤1.4V dropout at full load, 4.90–5.10V output tolerance at 10mA, and 40–50mV load regulation across 0–1.5A. It uses TO220-3L package with integrated thermal shutdown and current limiting, and is designed for stable 5V supply in VGA cards, high-speed bus termination, and 3.3V logic subsystems.

For engineers reviewing the AP1086D50L-U datasheet, AP1086D50L-U pinout, AP1086D50L-U application, or AP1086D50L-U equivalent, key selection criteria include dropout voltage under 1.4V at 1.5A, guaranteed 5.0V ±2% output accuracy, thermal resistance of 86°C/W (junction-to-ambient, no heatsink), minimum 10µF output capacitance requirement, and compatibility with 6.5–12V input range.

Technical Context

The AP1086D50L-U implements a fixed-output LDO architecture using an internal bandgap reference (1.25V) and error amplifier to regulate output against line and load variations. Its dropout behavior is defined by a PNP pass transistor with guaranteed 1.4V maximum (VIN–VOUT) at 1.5A, enabling operation from 6.5V input down to 5.0V output.

Stability relies on external output capacitance ≥10µF (aluminum electrolytic recommended); ripple rejection reaches 60–70dB at 120Hz with 25µF tantalum. Thermal shutdown activates at 150°C junction temperature, and current limiting engages above 1.6A under specified conditions.

Key Specifications

Pinout & Package

AP1086D50L-U is housed in a TO220-3L package with exposed tab electrically connected to VOUT for thermal conduction and mechanical mounting. The package features 3 leads in standard vertical configuration, RoHS-compliant lead-free finish, and green molding compound (Br/Sb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2940CT-5.0/NOPB and MIC2940A-5.0WU, AP1086D50L-U delivers higher continuous current (1.5A vs ≤1.25A), tighter output tolerance (±2% vs ±3%), and lower thermal resistance (86°C/W vs ≥100°C/W), making it optimal for thermally constrained, high-current 5V applications.

Availability

AP1086D50L-U is available at Aetrix Electronics and suitable for VGA graphics card power, PCI bus termination, and industrial I/O module designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant TO220 packaging.

Supply support for AP1086D50L-U 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 AP1086 series belongs to Diodes' precision LDO regulator product line, engineered specifically for low-noise, high-current 5V and adjustable-rail applications in graphics, bus interface, and embedded control systems.

FAQ

What is the minimum input voltage required for AP1086D50L-U to maintain 5.0V regulation?

The AP1086D50L-U requires VIN ≥ VOUT + dropout voltage. With a maximum dropout of 1.4V at 1.5A, the minimum input is 6.4V. The datasheet specifies 6.5V as the lower limit for guaranteed 5.0V operation across temperature and load, accounting for tolerance and transient margin.

Can AP1086D50L-U be used without a heatsink in continuous 1.5A operation?

No. At 1.5A with 6.5V input (1.5V differential), power dissipation is ~2.25W. With θJA = 86°C/W and 25°C ambient, junction temperature would exceed 200°C - well above the 150°C absolute maximum. A heatsink or PCB copper pour is mandatory for sustained 1.5A operation.

Is an input capacitor required for stable operation?

While not strictly required for stability (unlike the output capacitor), a ≥1µF ceramic input capacitor placed near the VIN pin is strongly recommended to suppress high-frequency noise and prevent input voltage sag during fast load transients, especially when sourced from long traces or switching regulators.

Does AP1086D50L-U support remote sensing of the output voltage?

No. AP1086D50L-U is a 3-terminal LDO without separate sense pins. Load regulation is specified at the VOUT pin, and voltage drop across PCB traces must be accounted for in system-level design. For remote-sense applications, a 4-terminal LDO such as the AP2112K-5.0 must be selected instead.