Diodes Incorporated AZ78L05ZTR-E1

Overview

AZ78L05ZTR-E1 from BCD Semiconductor Manufacturing Limited is a 3-terminal fixed-output +5V positive linear regulator in TO-92 ammo pack, delivering up to 100mA output current with ±5% output voltage tolerance over –40°C to +125°C, internal short-circuit current limiting, and thermal shutdown protection. It serves as a local on-card regulator for microprocessor I/O power supplies and post-regulation after switching converters.

For engineers reviewing the AZ78L05ZTR-E1 datasheet, AZ78L05ZTR-E1 pinout, AZ78L05ZTR-E1 application, or AZ78L05ZTR-E1 equivalent, key selection criteria include dropout voltage (1.6V), quiescent current (3–5mA), load regulation (20–60mV), and thermal resistance (81°C/W) - all critical for low-power embedded and board-level power integrity design.

Technical Context

The AZ78L05ZTR-E1 implements a monolithic series-pass linear regulator architecture with built-in bandgap reference, error amplifier, and thermal foldback circuitry. Its functional block diagram shows direct input-to-output path with ground-referenced feedback, no external compensation required.

It operates within 7.0V–15V input range while maintaining 5.0V ±5% output under 1.0–100mA load, with line regulation ≤75mV and load regulation ≤60mV. Thermal shutdown activates when junction temperature exceeds safe limit due to insufficient heatsinking or excessive power dissipation.

Key Specifications

Pinout & Package

Package: TO-92 (Ammo Packing), 3-pin plastic through-hole package with standard lead spacing and JEDEC-compliant mechanical dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78L05ACZ and MC78L05ACP, the AZ78L05ZTR-E1 offers superior thermal safety, tighter output accuracy, lower noise, and guaranteed RoHS compliance - making it optimal for modern industrial and embedded designs where reliability and regulatory alignment are non-negotiable.

Availability

AZ78L05ZTR-E1 is available at Aetrix Electronics and suitable for microprocessor I/O power supplies, post-regulation for switching supplies, HiFi audio signal chains, and industrial sensor interface modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AZ78L05ZTR-E1 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

BCD Semiconductor Manufacturing Limited is a China-based fabless analog IC designer specializing in power management, LED drivers, and high-voltage process technologies since 2003.

The AZ78LXX series was developed for cost-sensitive, space-constrained embedded systems needing robust, no-compromise linear regulation - targeting industrial controls, consumer audio, and automotive body electronics.

FAQ

What is the minimum input voltage required for the AZ78L05ZTR-E1 to maintain regulation?

The minimum input voltage is 6.7V under typical conditions (IOUT = 40mA, TJ = 25°C). This accounts for the 1.6V dropout voltage plus margin to sustain 5.0V ±5% output. Below this threshold, output voltage drops linearly with input, losing regulation capability.

Can the AZ78L05ZTR-E1 be used without input or output capacitors?

No. The datasheet mandates a 0.33μF input capacitor and 0.1μF output capacitor for stability and transient response. Omitting either risks oscillation, overshoot, or failure to reject ripple - especially under dynamic load changes or high-frequency noise.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C, the internal thermal shutdown circuit disables the pass element, dropping output to near-zero. Once the die cools by ~20°C, regulation automatically resumes - enabling self-recovering fault protection without latch-up or manual reset.

Is the AZ78L05ZTR-E1 pin-compatible with legacy 78L05 variants in TO-92?

Yes - pin 1 is INPUT, pin 2 is OUTPUT, pin 3 is GND, matching industry-standard 78L05 pinout. However, differences in quiescent current, PSRR, and thermal protection mean electrical behavior may vary; verify load and thermal margins in final layout.