Diodes Incorporated AP7335-33SNG-7

Overview

AP7335-33SNG-7 from Diodes Incorporated is a 300mA fixed-output (3.3V), low-dropout linear regulator in DFN2020-6 package, featuring 35μA quiescent current, 150mV dropout at full load, 65dB PSRR at 1kHz, and fast 220μs startup-designed for power management in space-constrained, battery-powered portable electronics.

For engineers reviewing the AP7335-33SNG-7 datasheet, AP7335-33SNG-7 pinout, AP7335-33SNG-7 application, or AP7335-33SNG-7 equivalent, key selection criteria include low-I_Q operation across 2V–6V input range, stability with 1μF ceramic output capacitor, thermal shutdown at 145°C, and EN pin logic-level control for system power sequencing.

Technical Context

The AP7335-33SNG-7 integrates a PMOS pass transistor, bandgap reference, error amplifier, and protection circuitry-including current limit (~600mA), short-circuit clamp (~140mA), and thermal shutdown with 15°C hysteresis. Its fixed 3.3V output eliminates external feedback resistors, simplifying layout while maintaining ±2% output accuracy over –40°C to +85°C ambient.

Designed for transient-heavy loads, it delivers excellent line/load regulation (<±0.6%), fast transient recovery (demonstrated in 100μs/div load step tests), and stable operation with ESR >15mΩ output capacitors-enabling reliable voltage rail generation for GSM baseband ICs and low-power DSPs requiring sub-200μs response to 0–300mA load steps.

Key Specifications

Pinout & Package

AP7335-33SNG-7 uses the DFN2020-6 package (2.0mm × 2.0mm × 0.6mm, 0.65mm pitch), thermally enhanced with an exposed pad connected to GND for improved heat dissipation (θ_JA = 251°C/W on FR-4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and XC6206P332MR-G, AP7335-33SNG-7 uniquely balances 300mA drive, 35μA I_Q, 150mV dropout, and active-high EN in a 2mm² DFN-making it optimal for space- and efficiency-critical portable designs requiring full-feature LDO control.

Availability

AP7335-33SNG-7 is available at Aetrix Electronics and suitable for smartphone baseband power, wireless headset audio codecs, portable medical sensor nodes, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7335-33SNG-7 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 solutions for power management, signal integrity, and connectivity applications.

The AP7335 series belongs to Diodes' precision low-dropout regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, fast transient response, and small-footprint packaging.

FAQ

What is the minimum input voltage required for AP7335-33SNG-7 to maintain regulation at 300mA load?

The minimum input voltage is calculated as V_OUT + V_DROP = 3.3V + 0.15V = 3.45V. This assumes worst-case 150mV dropout at 300mA and 25°C ambient. At elevated temperatures or higher current, dropout increases-consult Figure 9 (Dropout vs. Output Current) in DS32259 Rev. 3-2 for derating guidance.

Can AP7335-33SNG-7 operate without an output capacitor?

No. The device requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability, as confirmed in the Application Notes section. Omitting it causes oscillation and unregulated output, risking downstream IC damage. Larger capacitance improves transient response but does not replace the mandatory 1μF minimum.

Is the EN pin 5V-tolerant when VIN = 6V?

No. The EN pin absolute maximum rating is VIN + 0.3V per datasheet Table 1. With VIN = 6V, EN must not exceed 6.3V. Driving EN directly from a 5V logic source is safe; however, connecting to a 5V rail with overshoot exceeding 6.3V risks latch-up or permanent damage. Use a resistor divider if interfacing with >6V control signals.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~145°C, the output disables and remains off until temperature falls to ~130°C (15°C hysteresis). Under continuous overload, this causes thermal cycling-visible as periodic output toggling. To avoid cycling, ensure θ_JA ≤ 251°C/W and ambient ≤ 85°C, or reduce power dissipation via lower VIN or reduced I_OUT.