Diodes Incorporated AZ317DTR-E1

Overview

AZ317DTR-E1 from Diodes Incorporated is a three-terminal adjustable positive voltage regulator delivering 1A output current with 1.2V dropout at full load, ±1% reference voltage accuracy (1.25V), and integrated thermal shutdown and current limiting. It operates across 0°C to +125°C junction temperature and supports output voltages down to 1.25V using two external resistors - deployed in PC motherboards, LCD monitors, and telecom equipment power rails.

For engineers reviewing the AZ317DTR-E1 datasheet, AZ317DTR-E1 pinout, AZ317DTR-E1 application, or AZ317DTR-E1 equivalent, key selection criteria include dropout voltage at 1A, adjustable output range (1.25V–15V), thermal protection behavior, and TO252-2 (1)/(3) package compatibility with high-power PCB layouts.

Technical Context

The AZ317DTR-E1 implements a trimmed bandgap reference core with <100µA adjust pin current, enabling precise output voltage setting via R1/R2 feedback while minimizing error contribution. Its internal current limiter is factory-trimmed to 1.5A typical short-circuit current and maintains stable regulation under varying line (0.01%/V) and load (0.2%) conditions.

Thermal protection activates at +150°C junction temperature with +25°C hysteresis, and the device sustains operation up to 15V input while requiring only 3.5mA minimum load current. Dropout performance remains stable across temperature, with 1.2V typical at 1A and ≤1.3V maximum over full operating range.

Key Specifications

Pinout & Package

AZ317DTR-E1 is packaged in TO252-2 (1) and TO252-2 (3) surface-mount power packages, featuring exposed thermal pad for enhanced PCB heat dissipation. Thermal resistance junction-to-case is 10°C/W, enabling >5W power handling with adequate copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Compared with LM317LDR2G and TLV1117-33CDCYR, AZ317DTR-E1 uniquely balances 1A capability, 1.2V ultra-low dropout, and full adjustability in a thermally robust TO252 package - making it optimal for high-current, multi-voltage embedded power domains where efficiency and flexibility are jointly critical.

Availability

AZ317DTR-E1 is available at Aetrix Electronics and suitable for PC motherboard power delivery, LCD monitor supply rails, and telecom equipment auxiliary regulation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AZ317DTR-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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

AZ317 belongs to Diodes' precision adjustable LDO regulator product line, engineered for high-accuracy, low-dropout power conversion in computing, consumer, and communications infrastructure where reliability and thermal resilience are essential.

FAQ

What is the minimum input-to-output voltage differential required for AZ317DTR-E1 to maintain regulation at 1A?

The AZ317DTR-E1 requires a minimum 1.2V differential between input and output to sustain 1A output current, as specified in its electrical characteristics table. This dropout voltage increases slightly with temperature and load, reaching up to 1.3V maximum across the full operating range. Designers must ensure VIN ≥ VOUT + 1.3V under worst-case conditions.

Can AZ317DTR-E1 be used with ceramic output capacitors instead of tantalum?

Yes - the AZ317DTR-E1 is stable with ceramic output capacitors ≥1.0µF, provided ESR is ≥10mΩ. The datasheet specifies 1.0µF tantalum as typical, but ceramic capacitors meeting minimum capacitance and ESR requirements deliver equivalent transient response and phase margin. Avoid ultra-low-ESR ceramics (<5mΩ) without series resistance.

How does the adjust pin current affect output voltage accuracy in precision applications?

The adjust pin draws ≤100µA, contributing an error term of I_ADJ×R2 to the output equation. For R2 = 2.4kΩ (typical for 5V output), this adds ≤0.24mV error - negligible versus the ±1% reference tolerance. In sub-1% accuracy designs, use R2 ≤ 1kΩ or compensate mathematically, as I_ADJ varies <5µA over temperature.

Is AZ317DTR-E1 pin-compatible with other TO252-2 adjustable regulators like the LM317?

No - AZ317DTR-E1 uses INPUT–OUTPUT–ADJ pinout (1–2–3), whereas LM317 variants in TO252 use ADJ–OUTPUT–INPUT (1–2–3). Physical pin alignment differs: AZ317 places INPUT on lead 1, LM317 places ADJ there. PCB layout and schematic symbols must be updated; direct replacement requires redesign.