Vishay Siliconix SI9185DMP-25-T1-E3

Overview

SI9185DMP-25-T1-E3 from Vishay Siliconix is a micropower 500 mA CMOS low-dropout (LDO) voltage regulator with fixed 2.5 V output, error flag, and power-on-reset functionality. It operates from 2 V to 6 V input, delivers ≤2.5 V ±2.5% accuracy across -40 °C to 85 °C, achieves 300 mV dropout at 500 mA (V_OUT = 2.5 V), and supports ceramic output capacitors as low as 1 µF. It is deployed in portable electronics requiring stable, low-noise, battery-efficient power for core logic rails.

For engineers reviewing the SI9185DMP-25-T1-E3 datasheet, SI9185DMP-25-T1-E3 pinout, SI9185DMP-25-T1-E3 application, or SI9185DMP-25-T1-E3 equivalent, key selection criteria include guaranteed 500 mA output under 300 mV dropout at 2.5 V, 100 µV_RMS noise with CNOISE capacitor, 1 µA shutdown current, out-of-regulation error flag timing, and MLP33 PowerPAK thermal performance.

Technical Context

The SI9185DMP-25-T1-E3 implements a CMOS-based LDO architecture with internal 1.215 V reference and high-gain error amplifier, enabling fast line/load transient response (<30 mV dynamic load regulation, <10 mV dynamic line regulation) and >50 kHz bandwidth. Its error flag (open-drain ERROR pin) asserts low when V_OUT drops below 95% of nominal and can generate a programmable POR signal via external DELAY capacitor.

It integrates thermal shutdown (165 °C trip, 20 °C hysteresis), short-circuit protection (800 mA peak), and a 6 MΩ internal pull-down on SD. The fixed 2.5 V version ties SENSE/ADJ internally to V_OUT, eliminating external feedback components while maintaining 1.5% room-temperature output accuracy and 2.5% full-temperature accuracy.

Key Specifications

Pinout & Package

The SI9185DMP-25-T1-E3 uses the thermally enhanced MLP33 PowerPAK package (3 mm × 3 mm × 0.8 mm), featuring an exposed pad soldered to PCB ground for low θ_JA (50 °C/W) and 1.1 W power dissipation capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR-G and AP7361-25SG-13, the SI9185DMP-25-T1-E3 uniquely combines 500 mA capability, sub-300 mV dropout at full load, integrated error flag with programmable POR, and ultra-low 100 µV_RMS noise - making it optimal for space-constrained, battery-powered systems requiring both power integrity and supervisory intelligence.

Availability

SI9185DMP-25-T1-E3 is available at Aetrix Electronics and suitable for mobile computing, imaging subsystems, industrial handhelds, and battery-powered instrumentation requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for SI9185DMP-25-T1-E3 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

Vishay Siliconix designs high-performance discrete semiconductors and passive components, emphasizing reliability, efficiency, and miniaturization for power management and signal conditioning.

The Si9185 family was developed specifically for portable electronics demanding micropower operation, fast transient response, and integrated power supervision - targeting battery life extension and system-level fault resilience.

FAQ

What is the guaranteed output voltage tolerance for SI9185DMP-25-T1-E3 across temperature?

The SI9185DMP-25-T1-E3 guarantees ±2.5% output voltage accuracy over the full industrial temperature range (-40 °C to 85 °C). At room temperature (25 °C), the tolerance tightens to ±1.5%. This specification ensures reliable operation of 2.5 V logic interfaces and analog circuits without external trimming.

Can SI9185DMP-25-T1-E3 operate with a 2.2 V input supply?

No - SI9185DMP-25-T1-E3 requires minimum 2.0 V input, but dropout voltage at 500 mA load is 300 mV for 2.5 V output. With 2.2 V input, the maximum sustainable output is 1.9 V, below nominal. Stable 2.5 V regulation requires VIN ≥ 2.8 V to maintain margin above dropout.

How does the ERROR pin function in SI9185DMP-25-T1-E3, and what external components are needed?

The ERROR pin on SI9185DMP-25-T1-E3 is an open-drain output that pulls low when V_OUT falls below 95% of 2.5 V (i.e., <2.375 V). An external pull-up resistor (typically 10–100 kΩ to V_CC or V_IN) is mandatory. When combined with a capacitor on the DELAY pin, it generates a delayed power-on-reset signal - no additional supervisor IC is required.

What is the recommended output capacitor for SI9185DMP-25-T1-E3, and why is ESR not critical?

SI9185DMP-25-T1-E3 is stable with 1–10 µF X5R or X7R ceramic capacitors (±10%, 6.3 V rating). ESR is not critical because the CMOS control loop is inherently stable across low-ESR ceramics - unlike bipolar LDOs, which require minimum ESR for phase margin. This enables smaller, cheaper, and more reliable ceramic solutions.

Does SI9185DMP-25-T1-E3 support adjustable output voltages?

No - SI9185DMP-25-T1-E3 is a fixed 2.5 V output variant. Adjustable versions use part numbers ending in "-AD", such as SI9185DMP-AD-T1-E3. The SENSE/ADJ pin on SI9185DMP-25-T1-E3 is internally connected to VOUT and must not be externally modified; doing so may damage regulation or cause instability.