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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

STMicroelectronics ST4G3235BJR

Name: ST4G3235BJR
Brand: STMicroelectronics
SKU: ST4G3235BJR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST4G3235BJR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: ST4G3235BJR.pdf

Description:: IC TRANSLATOR UNIDIR 11FLIPCHIP

Quantity:: RFQ Add To RFQ list

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Inventory:37,598

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Product details

Overview

ST4G3235BJR from STMicroelectronics is a 4-bit dual-supply bus buffer level translator with integrated 26Ω series resistors on A-side outputs, designed for unidirectional voltage translation between mixed-voltage buses (e.g., 1.4V–3.6V ↔ 1.4V–3.6V). It delivers tPD = 4.3ns max at VCCA = 3.0V/VCCB = 1.65V, ICCA/ICCB ≤ 5µA at 85°C, and supports up to 380Mbps data rate in 1.8V-to-3.3V translation.

For engineers reviewing the ST4G3235BJR datasheet, ST4G3235BJR pinout, ST4G3235BJR application, or ST4G3235BJR equivalent, this device serves as a low-power, high-speed bidirectional-capable (asymmetric I/O) level shifter for interfacing legacy and modern low-voltage logic domains in embedded controllers, memory subsystems, and FPGA I/O expansion.

Technical Context

The ST4G3235 implements two independent 2-bit translation paths: A-side (VCCA-referred) inputs drive A-side outputs; B-side (VCCB-referred) inputs drive B-side outputs - enabling simultaneous A→B and B→A translation without internal feedback. Each path features input-tolerant buffers supporting signals exceeding VCCB or VCCA, plus power-down isolation when both supplies are inactive.

It integrates 26Ω series resistors on all A-side outputs (A1, A2) to dampen signal reflections in high-speed parallel buses, while B-side outputs (B3, B4) rely on symmetrical drive strength (|IOHB| = IOLB ≥ 4mA at VCCB = 1.65V) and balanced tPLH/tPHL propagation delays (≤ 0.5ns skew at 1.8V/2.5V).

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation delay (tPD)	4.3ns max (VCCA=3.0V, VCCB=1.65V, CL=10pF) - enables sub-250MHz clock domain crossing
Supply current (ICCA/ICCB)	5µA max at TA=85°C - ensures <10µW static power per channel in battery-backed systems
Output drive (A-side)	\|IOHA\| = IOLA ≥ 10mA min at VCCA=2.75V - sustains clean logic levels driving 50Ω transmission lines
Output drive (B-side)	\|IOHB\| = IOLB ≥ 4mA min at VCCB=1.65V - compatible with 1.8V LVTTL and low-VDD I/O standards
Data rate support	380Mbps (1.8V↔3.3V) - meets DDR SDRAM address/control bus timing in multi-voltage memory interfaces
ESD immunity	HBM > 2000V, MM > 200V - protects against handling damage in automated PCB assembly
Operating voltage range	VCCA & VCCB: 1.4V to 3.6V independently - supports 1.4V/1.8V, 1.8V/2.5V, 2.5V/3.3V system-level translation

Pinout & Package

ST4G3235BJR uses a Flip-Chip11 package (2.04mm × 1.41mm, 0.65mm height), optimized for high-density PCB layouts and thermal performance in space-constrained applications. The flip-chip construction eliminates wire bonds and reduces parasitic inductance.

Pin/Terminal	Circuit Role	Design Meaning
A1, A2	A-side output (VCCA-referred)	Driven by A3/A4 inputs; include 26Ω series resistor for controlled-impedance routing
A3, A4	A-side input (VCCA-referred)	Accept VCCA-compatible signals; tolerate voltages up to VCCA + 0.5V
B1, B2	B-side input (VCCB-referred)	Accept VCCB-compatible signals; tolerant to VCCB + 0.5V
B3, B4	B-side output (VCCB-referred)	Driven by B1/B2 inputs; no series resistor - requires external termination if needed
VCCA	Positive supply for A-side circuitry	Must be stable within 1.4V–3.6V; powers A-input receivers and A-output drivers
VCCB	Positive supply for B-side circuitry	Independent of VCCA; enables true dual-rail operation across voltage domains
GND	Common reference ground	Single ground plane required; no separate analog/digital GND pins

Key Features

Feature	Design Value
Integrated 26Ω series resistors on A-side outputs	Eliminates need for discrete series termination resistors on high-speed A→B traces, reducing BOM count and layout area
Symmetrical output impedance (A-side)	Enables matched rise/fall times (tPLH ≅ tPHL) critical for setup/hold timing margin in synchronous buses
Power-down protection on all I/O	Isolates both buses when VCCA = VCCB = 0V - prevents back-driving and leakage during system sleep states
Input voltage tolerance beyond rail	Supports hot-plug scenarios where input signals may exceed local supply (e.g., 3.3V signal into 1.8V domain)
Latch-up immunity >500mA (JESD17)	Guarantees robustness against transient overvoltage events in industrial control environments

Applications

Memory Interface Translation

FPGA I/O Expansion

Use Scenario: Interfacing a 3.3V microcontroller's address/data bus to a 1.8V LPDDR2 memory controller.

IC Role / Device Role / Timing Role: Unidirectional level translation for command/address signals with strict tPD ≤ 5ns requirement.

Use Value: Meets 380Mbps timing budget without external termination, reducing signal integrity risk in dense memory routing.

Use Scenario: Extending a Xilinx Spartan-6 FPGA's 2.5V bank to drive 1.4V sensors in an IoT edge node.

IC Role / Device Role / Timing Role: Voltage-domain bridging for GPIO and SPI control lines with independent VCCA/VCCB biasing.

Use Value: Enables direct connection without level-shifting discretes, cutting board area by 30% versus discrete MOSFET solutions.

Legacy Peripheral Integration

Multi-Rail Power Management

Use Scenario: Connecting a 3.3V UART peripheral to a 1.8V SoC's debug interface in a wearables platform.

IC Role / Device Role / Timing Role: Asymmetric translation (3.3V→1.8V only) with ESD-hardened I/O for handheld device reliability.

Use Value: HBM > 2000V rating eliminates need for external TVS diodes on debug port traces.

Use Scenario: Isolating power domains during dynamic voltage scaling in a battery-powered MCU subsystem.

IC Role / Device Role / Timing Role: Bidirectional bus keeper during VCCA/VCCB sequencing transitions, preventing floating bus states.

Use Value: Power-down protection ensures zero current flow between rails during brown-out conditions, extending battery life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TXS0104E	4-bit auto-direction sensing; no built-in series resistors; higher ICC (10µA typ)	Requires external pull-ups for direction control; unsuitable for fixed-direction high-speed buses	Select when bidirectional communication is needed and board space allows external termination
SN74AVC4T245	4-bit configurable direction control; no integrated resistors; tPD = 3.2ns (faster); VCC range 1.2V–3.6V	Needs external direction pin management; lacks power-down isolation	Prefer for ultra-low-latency designs where active control logic is available and isolation during sleep is not required

Compared with TXS0104E and SN74AVC4T245, ST4G3235BJR uniquely combines fixed-direction high-speed translation, on-die A-side series termination, and full power-down isolation - making it optimal for cost-sensitive, space-constrained, and low-quiescent-power mixed-voltage bus interfaces where direction is statically assigned.

Availability

ST4G3235BJR is available at Aetrix Electronics and suitable for memory subsystems, FPGA I/O expansion, legacy peripheral integration, and multi-rail power management requiring stable component supply across extended product lifecycles.

Supply support for ST4G3235BJR 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 innovative silicon solutions for automotive, industrial, and consumer markets since 1987.

The ST4G3235 belongs to ST's legacy bus interface portfolio, specifically engineered for low-voltage, high-speed, dual-supply level translation in resource-constrained embedded systems where power efficiency and signal integrity are co-critical.

FAQ

Can ST4G3235BJR translate bidirectionally on the same pin pair?

No. ST4G3235BJR provides two independent unidirectional paths: A3/A4 → A1/A2 and B1/B2 → B3/B4. It does not support automatic or manual direction reversal on shared pins. For true bidirectional translation, a dedicated auto-sensing device like TXS0104E is required.

What is the maximum allowable voltage difference between VCCA and VCCB?

VCCB must remain within –0.5V to VCCA + 0.5V per Absolute Maximum Ratings (Table 4). This allows up to 0.5V differential - e.g., VCCA = 1.8V and VCCB = 2.3V is valid, but VCCA = 1.4V and VCCB = 3.6V violates the VCCB ≤ VCCA + 0.5V limit and risks permanent damage.

Does the 26Ω series resistor apply to B-side outputs?

No. The 26Ω series resistor is present only on A-side outputs (A1, A2), as explicitly stated in the Features section and confirmed in Pin Description Table 2. B-side outputs (B3, B4) have no internal series resistance and require external termination if impedance matching is needed.

Is ST4G3235BJR RoHS-compliant and lead-free?

Yes. Per the datasheet description and Package Mechanical Data section, ST4G3235BJR uses an ECOPACK® Flip-Chip11 package with lead-free second-level interconnect, fully compliant with RoHS Directive 2011/65/EU and JEDEC JESD97 marking requirements.

ST4G3235BJR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Translator Type:: Voltage Level

Channel Type:: Unidirectional

Number of Circuits:: 1

Channels per Circuit:: 4

Voltage - VCCA:: 1.4 V ~ 3.6 V

Voltage - VCCB:: 1.4 V ~ 3.6 V

Input Signal:: -

Output Signal:: -

Output Type:: Non-Inverted

Data Rate:: 380Mbps

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Features:: Power-Off Protection

Mounting Type:: Surface Mount

Supplier Device Package:: 11-WFBGA, FCBGA

ST4G3235BJR FAQ

1.How can I place an order for ST4G3235BJR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST4G3235BJR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ST4G3235BJR reliable?

The price and inventory of ST4G3235BJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST4G3235BJR is usually 5 days.

3.What payment methods are accepted for ST4G3235BJR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST4G3235BJR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST4G3235BJR?

ST4G3235BJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST4G3235BJR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ST4G3235BJR?

For technical support, including ST4G3235BJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST4G3235BJR requirements.

6.How does Aetrix verify that ST4G3235BJR is sourced from the original manufacturer or authorized distributors?

All ST4G3235BJR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST4G3235BJR meets industry standards.

7.What is the process for return or replacement of ST4G3235BJR?

All ST4G3235BJR units undergo pre-shipment inspection (PSI). If there is an issue with ST4G3235BJR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ST4G3235BJR part is unused and in its original packaging.

Return procedure for ST4G3235BJR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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