Diodes Incorporated AP2205-33YR-13

Overview

AP2205-33YR-13 from Diodes Incorporated is a fixed-output 3.3V, 200mA ultra-low dropout (ULDO) linear regulator in SOT89R package, featuring 2.3V–24V input range, 100mV dropout at 100µA, 60dB PSRR at 1kHz, and ±2% output voltage accuracy-designed for USB-powered portable devices requiring stable low-noise bias under wide input and load variation.

For engineers reviewing the AP2205-33YR-13 datasheet, AP2205-33YR-13 pinout, AP2205-33YR-13 application, or AP2205-33YR-13 equivalent, key selection criteria include dropout performance at light loads, thermal shutdown behavior in SOT89R, EN pin logic thresholds, reverse current protection, and compatibility with ceramic output capacitors down to 2.2µF.

Technical Context

The AP2205-33YR-13 integrates a precision 1.24V bandgap reference, error amplifier, and current-limit circuit within a high-voltage EPNP process. Its internal architecture enables operation down to 2.3V input while maintaining regulation up to 24V, with thermal shutdown triggered at +150°C junction temperature and overcurrent protection limiting output to 250mA absolute maximum.

It supports active-low enable control (EN pin threshold: V_IL ≤ 0.4V, V_IH ≥ 2.0V), delivers ultra-low quiescent current (1µA standby), and provides reverse current blocking-critical for battery backup paths and multi-rail systems where backfeed must be prevented during power sequencing.

Key Specifications

Pinout & Package

SOT89R is a 3-pin thermally enhanced plastic package with exposed substrate pad (pin 2), rated at θ_JA = 129°C/W on 2-layer FR-4. The substrate must be connected to GND for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and XC6210B332MR-G, the AP2205-33YR-13 uniquely combines reverse current blocking, thermal shutdown, and sub-2.3V operational capability-making it the only choice for battery-backed, automotive-grade, or safety-critical 3.3V biasing where backfeed prevention and fault resilience are mandatory.

Availability

AP2205-33YR-13 is available at Aetrix Electronics and suitable for USB-powered instrumentation, industrial sensor nodes, laptop subsystems, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP2205-33YR-13 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 manufacturer specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The AP2205 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for wide-input, low-noise, battery-sensitive applications where dropout, quiescent current, and fault protection are design-critical parameters.

FAQ

What is the minimum input voltage required for regulation at 3.3V output?

The AP2205-33YR-13 maintains regulation down to 2.3V input-verified per Recommended Operating Conditions. At V_OUT = 3.3V, dropout is 100mV at 100µA load, meaning VIN as low as 3.4V sustains full regulation. Below 3.4V, output tracks input minus dropout until reaching the 2.3V absolute minimum.

Can the SOT89R package be used without connecting the exposed pad?

No-the SOT89R substrate/exposed pad (pin 2) must be connected to GND for both thermal performance and electrical stability. Leaving it unconnected degrades θ_JA by >40°C/W and may cause oscillation or premature thermal shutdown due to elevated junction temperature.

Does the AP2205-33YR-13 require an external resistor divider for output setting?

No-it is a fixed-output variant with internal resistor network set to 3.3V. The ADJ pin is not present in this version; pin 4 of the SOT25 variant is NC (not connected), and SOT89R has only three pins (VIN, GND, VOUT), eliminating any external feedback requirement.

How does the EN pin behave during power-up and brown-out conditions?

The EN pin is active-high with V_IH ≥ 2.0V and V_IL ≤ 0.4V. During power-up, the regulator remains disabled until VIN exceeds ~2.3V and EN reaches valid high level. Under brown-out, output disables cleanly when EN falls below 0.4V-even if VIN remains above dropout-ensuring deterministic reset behavior in noisy supply environments.