Diodes Incorporated AZ78L05ZTR-G1

Overview

AZ78L05ZTR-G1 from BCD Semiconductor Manufacturing Limited is a fixed-output +5 V, 100 mA three-terminal positive linear regulator in TO-92 (ammo packing) package. It features ±5% output voltage tolerance over –40°C to +125°C, internal short-circuit current limiting, thermal shutdown protection, and operates with input voltages up to 20 V. It delivers stable local regulation for microprocessor I/O power supplies and post-regulation of switching supplies.

For engineers reviewing the AZ78L05ZTR-G1 datasheet, AZ78L05ZTR-G1 pinout, AZ78L05ZTR-G1 application, or AZ78L05ZTR-G1 equivalent, key selection criteria include dropout voltage (1.6 V), quiescent current (3–5 mA), load regulation (20–60 mV), ripple rejection (47–62 dB at 120 Hz), and thermal resistance (81 °C/W junction-to-case in TO-92).

Technical Context

The AZ78L05ZTR-G1 implements a monolithic series-pass linear regulator architecture with built-in bandgap reference, error amplifier, and Darlington pass transistor. Its thermal shutdown activates when junction temperature exceeds ~150°C, and current limiting caps peak output at 150 mA to protect against sustained overload.

It requires no external components for basic operation but recommends 0.33 μF input and 0.1 μF output ceramic capacitors for stability and transient response. The device maintains regulation down to 6.7–7.0 V input under 40 mA load, with line regulation of 18–75 mV across its operating input range.

Key Specifications

Pinout & Package

Package: TO-92 (ammo packing), 3-pin plastic through-hole package with standard lead spacing and axial orientation. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND (viewed from flat side with leads down, left-to-right).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM78L05ACZ/NOPB and MC78L05ABP, the AZ78L05ZTR-G1 offers superior ripple rejection and lower quiescent current in a halogen-free green package-making it optimal for noise-sensitive, thermally constrained, and environmentally compliant designs.

Availability

AZ78L05ZTR-G1 is available at Aetrix Electronics and suitable for microprocessor I/O power supplies, post-regulation of switching supplies, HiFi audio signal chains, and logic system power distribution requiring stable component supply, long-term lifecycle support, and green packaging compliance.

Supply support for AZ78L05ZTR-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

BCD Semiconductor Manufacturing Limited is a Shanghai-based fabless analog IC designer specializing in high-reliability power management, interface, and precision analog products for industrial and automotive markets.

The AZ78LXX series was designed specifically for cost-effective, no-compromise local regulation in space-constrained and thermally sensitive applications-emphasizing robustness, low external component count, and green manufacturing compliance.

FAQ

What is the minimum input voltage required for the AZ78L05ZTR-G1 to maintain regulation?

The AZ78L05ZTR-G1 requires a minimum input voltage of 6.7–7.0 V to sustain 5 V output under 40 mA load, per datasheet Section 6. This is determined by its 1.6 V dropout voltage plus output tolerance margin. Below this, output drops linearly with input; operation below 6.7 V is outside guaranteed specification.

Can the AZ78L05ZTR-G1 be used without input or output capacitors?

No-input capacitance (≥0.33 μF) and output capacitance (≥0.1 μF) are mandatory per Figure 10 and Note 4. Omitting them risks instability, oscillation, or excessive output noise. Ceramic X7R types are recommended for low ESR and wide temperature stability.

Does the AZ78L05ZTR-G1 support reverse-polarity input protection?

No-the device lacks internal reverse-voltage protection. Applying negative voltage to the INPUT pin relative to GND can cause irreversible damage. External series diode or PMOS-based protection must be added if reverse polarity is possible in the system.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C due to excessive power dissipation, the thermal shutdown circuit disables the pass element. The device remains off until junction cools by ~20°C, then resumes regulation automatically-no manual reset or power cycle is required.