STMicroelectronics STG4158BJR

Overview

STG4158BJR from STMicroelectronics is a low-voltage single-pole dual-throw (SPDT) analog switch with break-before-make switching, 0.6 Ω typical ON-resistance at 4.5 V, 15 kV air-gap ESD protection on D pin, and integrated SEL pull-down resistor. It operates from 1.65 V to 4.5 V and is used in portable audio routing, battery-powered sensor multiplexing, and USB peripheral switching where power-off isolation and low leakage are critical.

For engineers reviewing the STG4158BJR datasheet, STG4158BJR pinout, STG4158BJR application, or STG4158BJR equivalent, key selection criteria include verified break-before-make timing (5–86 ns), channel-to-channel crosstalk (−81 dB @ 100 kHz), OFF-isolation (−76 dB), and flip-chip package thermal and layout constraints.

Technical Context

The STG4158BJR implements a CMOS C2MOS-based SPDT architecture with independent S1/S2 channels and a common D port, controlled by a single SEL input with internal ~5 MΩ pull-down. Its break-before-make behavior ensures no momentary short between S1 and S2 during switching, validated by measured t_D of 5–86 ns across supply range.

Power-off and overvoltage protection logic monitors V_D, V_S1, and V_S2 relative to V_CC; when any port exceeds V_CC + 0.4 V or floats, all switches enter high-impedance isolation mode (1 MΩ to GND), preventing backfeeding and latch-up under fault conditions.

Key Specifications

Pinout & Package

STG4158BJR uses a Flip Chip6 (6-bump) wafer-level chip-scale package (WLCSP) measuring 0.828 mm × 1.228 mm × 0.4 mm, optimized for ultra-compact portable PCBs. Bump pitch is 0.4 mm; terminal 1 (S1) is marked by a circular clear area on bump side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPDT analog switch applications.

Compared with TSM1013BQF and MAX4677ETE+, STG4158BJR delivers superior ESD robustness (15 kV vs. 8 kV), lower leakage (<30 nA vs. 100 nA), and autonomous fault isolation-critical for unattended portable medical and consumer devices.

Availability

STG4158BJR is available at Aetrix Electronics and suitable for portable audio routing, battery-powered sensor multiplexing, and medical wearable signal conditioning requiring stable component supply across long-lifecycle consumer and healthcare programs.

Supply support for STG4158BJR 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 microcontrollers, power ICs, analog switches, and MEMS sensors for industrial, automotive, and consumer markets.

The STG4158 belongs to ST's low-voltage analog switch product line, engineered specifically for space-constrained, battery-sensitive applications demanding ESD resilience, zero-power isolation, and sub-1 Ω signal path resistance.

FAQ

What is the maximum signal voltage that can be applied to S1/S2/D pins when V_CC = 0 V?

When V_CC = 0 V, the STG4158BJR enters isolation mode: all switches turn OFF and present ~1 MΩ impedance to GND. Per Absolute Maximum Ratings, the D, S1, and S2 pins tolerate −0.5 V to V_CC + 0.5 V, i.e., −0.5 V to +0.5 V. Exceeding this risks damage to internal ESD clamps.

Does the integrated SEL pull-down resistor affect switching speed or noise immunity?

No-the 5 MΩ SEL pull-down is weak enough to avoid loading standard CMOS drivers (typical drive strength > 1 mA), and does not degrade t_PLH/t_PHL (0.13–0.16 ns). It improves noise immunity by holding SEL LOW during power-up or floating states, preventing unintended switching.

Can STG4158BJR handle bidirectional analog signals up to 4.5 V peak-to-peak?

Yes-its rail-to-rail analog capability supports signals from GND to V_CC (1.65–4.5 V). With V_CC = 4.5 V, it passes ±2.25 V AC signals without clipping. R_ON flatness remains ≤0.4 Ω across 0–4.5 V, ensuring minimal THD (0.015%) and distortion.

How is thermal performance managed in the Flip Chip6 package during continuous 300 mA load?

The Flip Chip6 package has low thermal resistance (θ_JA ≈ 220 °C/W per datasheet modeling). At 300 mA through 0.85 Ω R_ON, power dissipation is 76.5 mW, raising junction temperature by ~17 °C above ambient-well within the −40 to 85 °C operating range and derating limits.