STMicroelectronics ST715M25R

Overview

ST715M25R from STMicroelectronics is a fixed-output 2.5 V, high-input-voltage (2.5–24 V), ultra-low-quiescent-current (3.8 µA typ. at full load) LDO linear regulator delivering up to 85 mA output current with 500 mV typical dropout voltage at full load. It operates across –40 °C to +125 °C and supports ceramic output capacitors as low as 0.47 µF - ideal for space-constrained battery-powered systems requiring stable low-noise 2.5 V rail generation.

For engineers reviewing the ST715M25R datasheet, ST715M25R pinout, ST715M25R application, or ST715M25R equivalent, key selection criteria include input voltage range compatibility, quiescent current under load, thermal performance in SOT23-5L, dropout behavior at 85 mA, and stability with small ceramic capacitors in portable or industrial edge-sensor designs.

Technical Context

The ST715M25R implements a bandgap reference-based error amplifier driving a P-channel pass transistor, enabling low dropout and high PSRR (45 dB @ 1 kHz, 62 dB @ 100 kHz). Internal thermal shutdown and short-circuit current limiting (120 mA typ.) provide fault protection without external components.

Its feedback loop is internally compensated for fixed-output variants, eliminating need for external compensation networks. The device achieves ±5% total output voltage accuracy over temperature and load, with line regulation of 0.001–0.004 %/V and load regulation of 0.002–0.003 %/mA - ensuring tight regulation across wide VIN and IOUT ranges.

Key Specifications

Pinout & Package

ST715M25R is packaged in SOT23-5L (JEDEC TO-236AB), a surface-mount 5-pin package with exposed pad not connected internally. Pin functions are validated per ST's DS5704 Rev 16 pin description table for fixed-output variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR and MIC5205-2.5YM5, ST715M25R uniquely balances ultra-low IQ (3.8 µA), 24 V input tolerance, and 85 mA capability in SOT23-5L - making it optimal for battery-backed industrial sensors and automotive body electronics where input range and standby efficiency are co-critical.

Availability

ST715M25R is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLC I/O modules, portable medical monitors, and automotive cabin controllers requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ST715M25R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The ST715 product line targets ultra-low-power, high-input-voltage LDO regulation in space-constrained portable and harsh-environment applications - emphasizing extended battery life, wide VIN flexibility, and robustness without external protection components.

FAQ

What is the minimum input voltage required for ST715M25R to regulate 2.5 V output?

The ST715M25R requires a minimum input voltage of 2.5 V plus its dropout voltage. At 85 mA load and 25 °C, typical dropout is 500 mV, so minimum VIN is 3.0 V. Over temperature and process variation, worst-case dropout reaches 1000 mV, requiring ≥3.5 V input to guarantee regulation across –40 °C to +125 °C.

Can ST715M25R be used with a 0.22 µF ceramic output capacitor?

No. STMicroelectronics specifies minimum output capacitance of 0.47 µF for stability across all operating conditions. Using 0.22 µF risks oscillation or poor transient response, as confirmed by Figure 9 (COUT stability region) in DS5704 Rev 16 - which shows instability below 0.47 µF for all COUT ESR values.

Does ST715M25R include an enable pin?

No. ST715M25R has no enable (EN) pin or shutdown function. It operates continuously whenever input voltage exceeds the under-voltage lockout threshold (~2.3 V). For applications requiring controlled startup or standby mode, an external MOSFET switch on the IN rail or a different ST part (e.g., ST715xxR with EN option) must be used.

What thermal derating applies to ST715M25R in SOT23-5L package at 85 °C ambient?

In SOT23-5L, R_thJA = 195 °C/W. At 85 °C ambient, maximum allowable junction temperature is 125 °C, so ΔT = 40 °C. Maximum power dissipation is 40 °C ÷ 195 °C/W = 205 mW. With 2.5 V output and 85 mA load, (VIN − 2.5 V) × 0.085 A ≤ 0.205 W → VIN ≤ 2.5 V + 2.41 V = 4.91 V. Thus, VIN must be ≤4.9 V at 85 °C ambient to avoid thermal shutdown.