Diodes Incorporated AS78L05ZTR-G1

Overview

AS78L05ZTR-G1 from Diodes Incorporated is a 100mA, fixed +5V positive linear voltage regulator in TO-92 (ammo packing) package with ±5% output voltage accuracy over –40°C to +125°C, internal current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and motherboard subsystems requiring low-quiescent-current, no-external-component operation.

For engineers reviewing the AS78L05ZTR-G1 datasheet, AS78L05ZTR-G1 pinout, AS78L05ZTR-G1 application, or AS78L05ZTR-G1 equivalent, key selection criteria include dropout voltage (1.7V at 40mA), PSRR (47–62dB at 120Hz), output noise (40µV RMS, 10Hz–100kHz), and thermal resistance (θ_JA = 180°C/W in TO-92).

Technical Context

The AS78L05ZTR-G1 implements a monolithic series-pass regulator architecture with built-in short-circuit current limiting and thermal overload protection. Its safe-area compensation ensures robustness under transient overloads without external foldback circuitry.

It operates across an input voltage range of 7–20V (recommended) up to 30V absolute maximum, maintaining regulated 5V output with line regulation ≤150mV and load regulation ≤60mV across 1–100mA output current.

Key Specifications

Pinout & Package

AS78L05ZTR-G1 uses the TO-92 (ammo packing) package: 3-pin, through-hole, plastic case with standard lead form. Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78L05ACZ-TR and MC78L05CP, AS78L05ZTR-G1 offers identical accuracy and lower quiescent current than the former, plus RoHS/green compliance absent in the latter - making it optimal for new industrial and consumer designs requiring regulatory alignment and efficiency.

Availability

AS78L05ZTR-G1 is available at Aetrix Electronics and suitable for consumer electronics power rails, microcontroller core supplies, and motherboard peripheral regulation requiring stable component supply, long-term lifecycle support, and RoHS/green compliance.

Supply support for AS78L05ZTR-G1 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 AS78LXX series targets cost-sensitive, space-constrained applications needing simple, robust local regulation - emphasizing integration, thermal resilience, and broad package availability (TO-92, SOT-89, SOIC-8).

FAQ

What is the minimum input voltage required for AS78L05ZTR-G1 to regulate at full load?

The AS78L05ZTR-G1 requires a minimum input voltage of 6.7V at 100mA load (5.0V + 1.7V dropout). The recommended operating range starts at 7V to ensure margin across temperature and tolerance. Below this, output voltage drops linearly with input.

Can AS78L05ZTR-G1 replace older 78L05 variants in existing designs?

Yes - AS78L05ZTR-G1 is pin-compatible and functionally equivalent to industry-standard 78L05 regulators in TO-92 ammo pack. It matches electrical specs (±5% V_OUT, 100mA, 1.7V dropout) and adds RoHS/green compliance without layout changes.

Is an input capacitor required for stable operation?

The datasheet specifies a 0.33µF ceramic input capacitor for transient immunity, especially when input traces are long or sourced from switching supplies. While not strictly mandatory for basic DC operation, omitting it risks instability under fast load transients.

How does thermal performance compare between TO-92 and SOT-89 packages?

AS78L05ZTR-G1 in TO-92 has θ_JA = 180°C/W; the SOT-89 variant (e.g., AS78L05RTR-G1) achieves 120°C/W due to larger copper pad area. For 100mA continuous operation at 70°C ambient, TO-92 reaches ~125°C junction - within spec but near limit; SOT-89 provides 25°C lower junction rise.