Diodes Incorporated AP7115-12SEG-7

Overview

AP7115-12SEG-7 from Diodes Incorporated is a 150mA fixed-output (1.2V) low-dropout linear regulator in SOT353 package, featuring 200mV dropout at full load, 50µA quiescent current, ±2% output voltage accuracy, and integrated thermal shutdown and current-limit protection. It serves as a power management IC for battery-powered portable electronics requiring stable low-voltage bias.

For engineers reviewing the AP7115-12SEG-7 datasheet, AP7115-12SEG-7 pinout, AP7115-12SEG-7 application, or AP7115-12SEG-7 equivalent, key selection criteria include dropout voltage under 150mA load, EN-controlled shutdown functionality, BP pin bypass capacitor requirement, and SOT353 thermal resistance (θJA = 337°C/W).

Technical Context

The AP7115-12SEG-7 employs a PMOS pass element with bandgap-referenced error amplifier control, enabling stable regulation across 2.5V–5.5V input while maintaining low quiescent current. Its enable (EN) pin provides logic-level on/off control, and the BP pin accepts a 0.1µF ceramic capacitor to reduce output noise by stabilizing the internal reference.

Protection circuitry includes foldback current limiting (200–250mA typ.), short-circuit survival (indefinite ground fault), and thermal shutdown activation at +150°C with 30°C hysteresis. The device operates over –40°C to +85°C ambient and supports output capacitance ≥1µF with ESR <1Ω for stability.

Key Specifications

Pinout & Package

SOT353 (5-pin, 2.15mm × 1.30mm × 0.90mm) surface-mount package with exposed pad not electrically connected; JEDEC-compliant footprint per Diodes Inc. outline drawing SOT353.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315-12SG-7, the AP7115-12SEG-7 offers proven field reliability but higher IQ and lower PSRR; versus MCP1700T-1202E/TT, it delivers superior noise performance and thermal robustness at the cost of higher static power.

Availability

AP7115-12SEG-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, GSM/GPRS handsets, and USB-powered peripherals requiring stable component supply with long-lifecycle support.

Supply support for AP7115-12SEG-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The AP7115 belongs to Diodes' low-power LDO family designed specifically for space-constrained, battery-operated consumer and industrial electronics where dropout, quiescent current, and protection integrity are critical.

FAQ

What is the minimum input voltage required for AP7115-12SEG-7 to maintain regulation at 150mA?

The minimum input voltage is calculated as VOUT + VDO = 1.2V + 0.2V = 1.4V. However, the absolute minimum specified operating input is 2.5V per datasheet-this reflects practical limits including start-up margin, line regulation, and transient headroom. Operation below 2.5V is not guaranteed.

Can the BP pin be left floating or tied directly to OUT?

No. The BP pin must be connected to a 0.1µF ceramic capacitor between BP and GND. Leaving it floating degrades output noise performance and may cause instability; tying it to OUT defeats the bandgap reference bypass function and risks oscillation due to improper feedback path impedance.

Is AP7115-12SEG-7 pin-compatible with AP7315-12SG-7?

Yes-both use identical SOT353 packaging and share identical pin assignments (IN, GND, EN, BP, OUT). Electrical differences exist (e.g., PSRR, IQ), but board-level replacement is mechanically and electrically feasible without layout changes.

What is the maximum allowable power dissipation for AP7115-12SEG-7 at 85°C ambient?

Using θJA = 337°C/W and TJ(MAX) = 125°C: PD(MAX) = (125°C − 85°C) / 337°C/W ≈ 119mW. At 150mA output and 1.2V, this corresponds to max VIN ≈ 1.2V + (0.119W / 0.15A) ≈ 2.0V-confirming that operation above ~2.5V input requires careful thermal design or derating.