Diodes Incorporated AZ78L05Z-E1

Overview

AZ78L05Z-E1 from BCD Semiconductor Manufacturing Limited is a three-terminal positive linear voltage regulator delivering a fixed 5 V output with ±5% tolerance over −40 °C to +125 °C, supporting up to 100 mA load current and featuring internal short-circuit current limiting and thermal shutdown protection. It is designed for local on-card regulation in logic systems, instrumentation, and HiFi audio equipment using TO-92 packaging.

For engineers reviewing the AZ78L05Z-E1 datasheet, AZ78L05Z-E1 pinout, AZ78L05Z-E1 application, or AZ78L05Z-E1 equivalent, key selection criteria include dropout voltage (1.6 V), quiescent current (3–5 mA), line/load regulation (≤75 mV / ≤60 mV), and thermal resistance (81 °C/W) in the TO-92 package for low-cost, space-constrained DC power conditioning.

Technical Context

The AZ78L05Z-E1 implements a monolithic series pass transistor with bandgap reference, error amplifier, and thermal foldback circuitry to maintain stable 5 V output under varying input (7.0–15 V) and load (1–100 mA) conditions. Its architecture integrates current limiting at 150 mA peak and thermal shutdown activation when junction temperature exceeds safe limits.

It operates without external components-only recommended input (0.33 μF) and output (0.1 μF) bypass capacitors-and achieves 47–62 dB ripple rejection at 120 Hz. The device exhibits 0.65 mV/°C average temperature coefficient and 40 μV RMS output noise (10 Hz–100 kHz).

Key Specifications

Pinout & Package

Package: TO-92 (bulk packing), 3-pin plastic through-hole package with 1.27 mm lead pitch and 81 °C/W junction-to-case thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78L05ACZ and MC78L05ABP, the AZ78L05Z-E1 offers best-in-class noise performance (40 μV) and PSRR (62 dB) for cost-sensitive industrial and consumer electronics, while maintaining identical pinout and footprint compatibility with legacy 78L05 variants.

Availability

AZ78L05Z-E1 is available at Aetrix Electronics and suitable for microprocessor I/O power supply, post-regulation for switching supplies, HiFi audio biasing, and instrumentation sensor conditioning requiring stable component supply with RoHS-compliant, lead-free construction.

Supply support for AZ78L05Z-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 Shanghai-based fabless analog IC design house specializing in high-performance power management, interface, and mixed-signal solutions for industrial, automotive, and consumer markets.

The AZ78LXX series was developed to replace legacy 78Lxx regulators with improved thermal protection, tighter output tolerance, and enhanced ripple rejection-targeting cost-sensitive, space-constrained embedded power nodes.

FAQ

What is the minimum input voltage required for stable 5 V regulation?

The AZ78L05Z-E1 requires a minimum input voltage of 6.7 V to maintain line regulation under all operating conditions, based on its 1.6 V dropout voltage and 5.0 V nominal output. At 100 mA load and 25 °C, VIN must remain ≥7.0 V to guarantee output accuracy within ±5%.

Can AZ78L05Z-E1 operate without input or output capacitors?

No-while the device functions without external capacitors, BCD Semiconductor specifies 0.33 μF input and 0.1 μF output ceramic capacitors for stable operation, optimal transient response, and ripple suppression. Omitting them risks oscillation, poor load step recovery, and degraded PSRR.

Is thermal shutdown reversible, and how does it behave during fault conditions?

Yes-thermal shutdown is fully reversible. When junction temperature exceeds ~150 °C, the internal circuit disables the pass transistor until temperature drops below ~135 °C, then automatically resumes regulation. This cycle repeats continuously during sustained overload, protecting the die without latch-up.

How does AZ78L05Z-E1 compare to standard 78L05 in terms of quiescent current efficiency?

The AZ78L05Z-E1 draws only 3–5 mA quiescent current at zero load-up to 30% lower than typical 78L05 devices (5.5–7 mA). This reduction directly improves standby power in always-on systems and extends battery life in portable instrumentation.