Diodes Incorporated AZ1117BH-1.8TRE1

Overview

AZ1117BH-1.8TRE1 from BCD Semiconductor is a 1.8 V fixed-output, 600 mA low dropout linear regulator in SOT-223 package, featuring ±1% output voltage accuracy, 1.2 V dropout at 800 mA, and integrated thermal shutdown. It delivers stable power to noise-sensitive analog and digital circuitry in space-constrained applications where input-to-output differential is minimal.

For engineers reviewing the AZ1117BH-1.8TRE1 datasheet, AZ1117BH-1.8TRE1 pinout, AZ1117BH-1.8TRE1 application, or AZ1117BH-1.8TRE1 equivalent, key selection criteria include dropout voltage at full load, PSRR at 120 Hz, RMS output noise (0.003% of VOUT), quiescent current (max 6 mA), and thermal shutdown junction temperature (160 °C).

Technical Context

The AZ1117BH-1.8TRE1 uses a trimmed bandgap reference and internal error amplifier to maintain 1.8 V output within ±1% across -20 °C to 125 °C junction temperature. Its architecture supports operation with as little as 1.2 V headroom between input and output at 800 mA load.

It integrates overcurrent protection (1.0 A typical limit) and thermal shutdown with 16 °C hysteresis. The device requires only 10 μF input and 22 μF output ceramic capacitors for stability and achieves 70 dB PSRR at 120 Hz with 3 V headroom.

Key Specifications

Pinout & Package

Package: SOT-223 (H-type), thermally enhanced surface-mount package with exposed thermal pad; footprint compatible with JEDEC MO-178AB; θ_JA = 150 °C/W (no heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117M-1.8TRG1 and LD1117S18TR, AZ1117BH-1.8TRE1 offers tighter ±1% output accuracy and lower 6 mA max IQ-critical for portable devices-while retaining SOT-223 compatibility, unlike LD1117S18TR's package limitations.

Availability

AZ1117BH-1.8TRE1 is available at Aetrix Electronics and suitable for USB device power, PC motherboard standby rails, DVD player SoC core supplies, and add-on card regulation requiring stable component supply and RoHS-compliant lead-free packaging.

Supply support for AZ1117BH-1.8TRE1 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 analog and power IC designer specializing in high-reliability, cost-optimized linear and switching regulators for consumer, computing, and industrial markets.

AZ1117B belongs to BCD's mainstream LDO product line, engineered for low-noise, low-dropout performance in space-constrained applications where simplicity, accuracy, and thermal robustness are prioritized over ultra-low IQ or ultra-high PSRR.

FAQ

What is the minimum input voltage required for AZ1117BH-1.8TRE1 to regulate 1.8 V at 600 mA?

The minimum input voltage is 3.0 V, derived from the 1.2 V dropout voltage specification at 800 mA load. At 600 mA, dropout is ≤1.2 V, so VIN ≥ 1.8 V + 1.2 V = 3.0 V ensures regulation. Operation below this risks output collapse under full load.

Can AZ1117BH-1.8TRE1 replace adjustable LDOs like AZ1117BH-ADJTRE1 in existing designs?

No - AZ1117BH-1.8TRE1 has internal feedback resistors set for 1.8 V output and no ADJ pin functionality. Replacing an adjustable variant requires verifying that 1.8 V meets all downstream voltage requirements and removing external R1/R2 components, as the pinout repurposes pin 3 as GND-only.

Is a heat sink required for continuous 600 mA operation in still air?

Not mandatory but recommended for ambient temperatures above 60 °C. With θ_JA = 150 °C/W and 1.2 V dropout, power dissipation is 0.72 W; junction temperature rise is ~108 °C. At 25 °C ambient, T_J ≈ 133 °C - near the 125 °C max operating limit, so thermal relief improves margin.

Which output capacitor types and values are validated for stability with AZ1117BH-1.8TRE1?

BCD specifies ≥22 μF ceramic (X5R/X7R) or tantalum capacitors with ESR ≤ 1 Ω. Ceramic capacitors are preferred for lowest noise and smallest footprint; 22 μF–47 μF range ensures phase margin >60° and load transient recovery <50 μs per datasheet Figure 13.