Diodes Incorporated AZ1117CR-3.3TRG1

Overview

AZ1117CR-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator in SOT89 package, delivering up to 1.35A output current with ±1% output voltage accuracy, 1.3V typical dropout at 0.8A, and 70dB PSRR at 120Hz. It integrates thermal shutdown and current limit protection, and is optimized for USB devices and PC motherboard power rails where transient response and low input headroom are critical.

For engineers reviewing the AZ1117CR-3.3TRG1 datasheet, AZ1117CR-3.3TRG1 pinout, AZ1117CR-3.3TRG1 application, or AZ1117CR-3.3TRG1 equivalent, key selection criteria include dropout voltage under load, output noise (0.003% of VOUT), quiescent current (max 6mA), thermal resistance (170°C/W without heatsink), and compatibility with low-ESR ceramic capacitors (min 10µF, ESR <20Ω).

Technical Context

The AZ1117CR-3.3TRG1 uses a trimmed bandgap reference and internal error amplifier to maintain stable 3.3V output across -20°C to +125°C junction temperature. Its current-limit circuit activates at ≥1A and clamps at 1.35A typical, while thermal shutdown triggers at +160°C with +16°C hysteresis.

It operates with input voltages up to 15V and requires only two external ceramic capacitors: minimum 10µF output capacitance (ESR <20Ω) and optional 10µF input capacitor. The device is not internally compensated for adjustable versions but is fully optimized for fixed-output configurations with integrated feedback resistors.

Key Specifications

Pinout & Package

The AZ1117CR-3.3TRG1 is packaged in the SOT89-3 (TO-243AA) surface-mount outline: 4.4mm × 2.9mm × 1.5mm body, with exposed tab for thermal conduction. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB, AZ1117CR-3.3TRG1 delivers 5.4× more output current and maintains regulation down to lower input voltage; versus TLV1117-33CDCYR, it offers 1.7× higher current limit and identical dropout but in a smaller SOT89 footprint-critical for dense add-on card designs.

Availability

AZ1117CR-3.3TRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC motherboard I/O rails, DVD player system supplies, and add-on card regulation requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for AZ1117CR-3.3TRG1 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1117C series is part of Diodes' precision LDO portfolio, designed specifically for low-voltage, high-transient-response applications where minimal input-to-output differential and tight output tolerance are essential.

FAQ

What is the minimum input voltage required for AZ1117CR-3.3TRG1 to regulate at full 1.35A load?

The minimum input voltage is determined by dropout: at 0.8A, typical dropout is 1.3V (TO252-2) or 1.2V (SOT223); for SOT89, datasheet specifies 1.3V typical at 0.8A. Thus, VIN(min) = 3.3V + 1.3V = 4.6V. At 1.35A, dropout increases slightly-designers should verify with thermal derating curves and ensure junction temperature remains ≤125°C.

Can AZ1117CR-3.3TRG1 be used with aluminum polymer capacitors instead of ceramic?

No-aluminum polymer capacitors typically exceed the 20Ω ESR limit specified for stability. The AZ1117C family is explicitly characterized and guaranteed stable only with low-ESR ceramic capacitors (≥10µF, ESR <20Ω). Using higher-ESR types risks oscillation or poor transient response, per Section 8.2.2 of DS36676 Rev. 5-2.

Does AZ1117CR-3.3TRG1 require an input capacitor?

An input capacitor is not strictly required for stability but is strongly recommended: a 10µF ceramic capacitor placed near the INPUT pin reduces high-frequency noise and improves line transient response. The datasheet shows improved performance in Figure 13 (Line Transient Response) when a 10µF input cap is used alongside the 22µF output cap.

Is AZ1117CR-3.3TRG1 qualified for automotive applications?

No-the standard AZ1117CR-3.3TRG1 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AZ1117CH-3.3TRG1 in SOT223) with PPAP capability and IATF 16949 manufacturing, but the SOT89-packaged CR variant is intended for commercial/industrial use only. Automotive designs require explicit qualification documentation from Diodes.