STMicroelectronics ST1G3234BJR

Overview

ST1G3234BJR from STMicroelectronics is a 1-bit dual-supply bus buffer level translator with A-side series resistor, designed for unidirectional voltage translation between mixed-voltage buses (e.g., 1.4V–3.6V on either side). It delivers 4.4ns max propagation delay at 85°C, 5µA max quiescent current per supply, and integrates 26Ω series resistors on A-side outputs for signal integrity in high-speed digital interfaces.

For engineers reviewing the ST1G3234BJR datasheet, ST1G3234BJR pinout, ST1G3234BJR application, or ST1G3234BJR equivalent, this device supports critical low-power, high-speed level-shifting tasks in portable computing, industrial I/O modules, and multi-rail FPGA/ASIC interconnects where supply isolation and ESD robustness (>2000V HBM) are required.

Technical Context

The ST1G3234BJR implements a CMOS-based, single-directional level translation architecture with independent VCCA (output-side) and VCCB (input-side) supplies, enabling interoperability across 1.4V–3.6V domains. Its input-tolerant buffers accept signals up to VCCB + 0.5V while driving VCCA-referenced outputs with symmetrical ±10mA drive capability at 2.75V VCCA.

Power-down protection disables both input and output paths when either supply drops below operational threshold, ensuring bus isolation. The integrated 26Ω A-side series resistor suppresses reflections and reduces EMI without requiring external termination components in point-to-point links.

Key Specifications

Pinout & Package

ST1G3234BJR uses a Flip-Chip 5 package (1.36mm × 1.02mm, 0.433mm pitch), optimized for space-constrained board layouts and thermal performance in portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-bit dual-supply level translation applications.

Compared with TXS0101DCUR and SN74AVC1T45DBVR, ST1G3234BJR uniquely combines fixed unidirectional translation, integrated 26Ω A-side termination, and sub-5µA quiescent current-making it optimal for compact, high-speed, low-power point-to-point links where signal integrity and BOM simplification are prioritized.

Availability

ST1G3234BJR is available at Aetrix Electronics and suitable for mobile baseband interface, FPGA I/O translation, and industrial PLC I/O modules requiring stable component supply despite its obsolete status, supported via verified surplus channels and lifecycle-managed sourcing.

Supply support for ST1G3234BJR 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.

The ST1G3234 belongs to ST's low-voltage logic translation product line, engineered specifically for energy-efficient, space-constrained mixed-supply system interconnects in portable and industrial electronics.

FAQ

Is ST1G3234BJR pin-compatible with other STMicroelectronics level translators like ST2G3234?

No. ST1G3234BJR is a 1-bit device in Flip-Chip 5 package with five terminals (A1, B1, GND, VCCA, VCCB). ST2G3234 is a 2-bit variant in the same package but with eight pins, including separate enable and dual-channel I/O. Pin mapping and function allocation differ fundamentally.

Can ST1G3234BJR operate with VCCA = 1.4V and VCCB = 3.3V?

Yes. The device supports all combinations within VCCA and VCCB ranges of 1.4V–3.6V. At VCCA = 1.4V and VCCB = 3.3V, VOHA is guaranteed ≥1.1V (IO = –1mA), satisfying 1.4V logic-high threshold, and VOLA ≤0.20V (IO = 1mA), meeting 1.4V logic-low requirement.

Does ST1G3234BJR support bidirectional data flow?

No. ST1G3234BJR is strictly unidirectional: B1 (input, VCCB-referenced) → A1 (output, VCCA-referenced). It lacks direction control logic or bus-hold circuitry. Bidirectional use requires external control logic and additional components, which voids guaranteed timing and drive specifications.

What is the significance of the "26Ω series resistor on A-side outputs"?

The 26Ω resistor is monolithically integrated in series with the A1 output driver. It provides source termination for controlled-impedance PCB traces (e.g., 50Ω), reducing signal reflections and overshoot without external components-critical for maintaining signal integrity at 380Mbps in compact handheld PCB layouts.