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

STMicroelectronics ST1G3234BBJR

Name: ST1G3234BBJR
Brand: STMicroelectronics
SKU: ST1G3234BBJR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1G3234BBJR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: ST1G3234BBJR.pdf

Description:: IC TRANSLATOR UNIDIR 5FLIPCHIP

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Inventory:2,115

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Product details

Overview

ST1G3234BBJR from STMicroelectronics is a 1-bit dual-supply bus buffer level translator with A-side 26Ω series resistor, designed for unidirectional voltage translation between mixed-voltage buses (e.g., 1.4V–3.6V ↔ 1.4V–3.6V). It delivers 4.4ns max propagation delay at 85°C, 5µA max quiescent current per supply, and supports up to 380Mbps data rate in 1.8V-to-3.3V translation.

For engineers reviewing the ST1G3234BBJR datasheet, ST1G3234BBJR pinout, ST1G3234BBJR application, or ST1G3234BBJR equivalent, this device is selected for low-power, high-speed bidirectional voltage domain isolation in portable SoC interfaces, DDR memory I/O buffers, and multi-rail FPGA I/O bridging where input/output power-down protection and rail-tolerant inputs are required.

Technical Context

The ST1G3234BBJR implements a CMOS-based level-shifting buffer with separate VCCA (output-side) and VCCB (input-side) supplies, enabling asynchronous translation across independent voltage domains. Its input-tolerant structure accepts signals up to VCCB + 0.5V while driving VCCA-referenced outputs with symmetrical ±10mA drive capability at 2.75V VCCA.

Power-down protection activates when either supply drops near ground, disabling both input and output paths to isolate buses. The integrated 26Ω series resistor on the A-side output reduces signal reflections and EMI without requiring external termination in high-speed point-to-point links.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay (tPD)	4.4ns max at TA = 85°C, VCCB = 1.65V/VCCA = 3.0V - enables sub-5ns timing closure in 200+ MHz digital interfaces
Quiescent Current (ICCA/ICCB)	5µA max per supply at TA = 85°C - supports ultra-low standby power in battery-backed systems
Output Drive Strength	±10mA min at VCCA = 2.75V, VCCB = 1.4–3.6V - ensures robust logic-level integrity into 50Ω loads
Max Data Rate	380Mbps for 1.8V→3.3V translation - suitable for high-speed serial control links and memory address/data buses
Operating Voltage Range	VCCA & VCCB: 1.4V to 3.6V (1.2V data retention) - covers 1.8V, 2.5V, 3.3V, and 1.4V logic families in mixed-rail designs
ESD Robustness	HBM > 2000V, MM > 200V - meets industrial IEC 61000-4-2 system-level immunity requirements
Latch-up Immunity	Exceeds 500mA (JESD17) - prevents destructive latch-up during supply sequencing or transient overvoltage events

Pinout & Package

ST1G3234BBJR uses a Flip-Chip 5 package (1.36mm × 1.02mm, 0.433mm pitch), RoHS-compliant with lead-free interconnect and ECOPACK® designation.

Pin/Terminal	Circuit Role	Design Meaning
A1	A-side output (VCCA-referenced)	Translates B1 input to VCCA logic levels; includes integrated 26Ω series resistor for controlled edge rate
B1	B-side input (VCCB-referenced)	Accepts VCCB-compatible signals up to VCCB + 0.5V; tolerant of overvoltage relative to VCCA
GND	Ground reference	Common return path for both supply domains; must be low-inductance connection to minimize noise coupling
VCCA	Output-side supply	Powers A1 output stage; sets high/low logic thresholds for translated output
VCCB	Input-side supply	Biases B1 input structure; defines input VIH/VIL thresholds and enables rail-to-rail input tolerance

Key Features

Feature	Design Value
Asymmetric supply operation	Independent VCCA (1.4–3.6V) and VCCB (1.4–3.6V) enable flexible interface between non-matching voltage rails
Power-down bus isolation	Automatic input/output disable when either VCCA or VCCB falls near GND - prevents back-driving and leakage during power sequencing
Integrated output series resistor	26Ω on A1 output eliminates need for discrete termination in point-to-point traces, reducing BOM count and layout area
Symmetrical propagation delays	tPLH ≅ tPHL minimizes duty-cycle distortion in clock-forwarding or strobe-based protocols
Rail-tolerant input structure	B1 accepts signals exceeding VCCB by up to 0.5V - simplifies interfacing with higher-voltage peripherals without external clamping

Applications

Mobile Baseband Interface

FPGA I/O Bridging

Use Scenario: Connecting a 1.8V application processor's GPIO to a 3.3V peripheral such as an audio codec or sensor hub in smartphone platforms.

IC Role / Device Role / Timing Role: Unidirectional level translator isolating voltage domains while preserving signal integrity and timing margins.

Use Value: Eliminates need for discrete resistors and MOSFET translators, reducing PCB area and assembly cost in space-constrained mobile modules.

Use Scenario: Interfacing a 2.5V FPGA I/O bank to a 1.4V ASIC subsystem in reconfigurable test equipment.

IC Role / Device Role / Timing Role: Voltage-domain translator enabling synchronous data transfer with <4.4ns skew between rising/falling edges.

Use Value: Maintains setup/hold timing across voltage boundaries without external delay compensation or calibration.

DDR Memory Address Bus

Industrial PLC I/O Module

Use Scenario: Driving DDR2/DDR3 address/command lines from a 1.5V controller to a 1.8V or 2.5V memory subsystem.

IC Role / Device Role / Timing Role: Low-skew buffer translating control signals while suppressing reflections via built-in 26Ω series resistance.

Use Value: Reduces signal integrity risk on stubbed address buses without adding trace-length matching constraints.

Use Scenario: Isolating field-side 24V digital inputs (via level-shifted optocoupler outputs) from a 3.3V microcontroller in programmable logic controllers.

IC Role / Device Role / Timing Role: Robust level shifter with >2000V HBM ESD rating and latch-up immunity for harsh industrial environments.

Use Value: Enables direct connection to noisy industrial backplanes without additional transient suppression components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TXS0101DCKR	Single-bit auto-direction sensing; no A-side series resistor; 5.5ns max tPD at 3.3V	Requires bidirectional data flow; lacks integrated termination for high-speed point-to-point links	Select when direction control is unavailable or dynamic; avoid when reflection control is critical
SN74AVC1T45DBVR	Direction-controlled dual-supply translator; no built-in series resistor; 3.8ns max tPD at 3.3V	Needs external OE and DIR pins; higher drive strength (±12mA) but no on-die termination	Prefer for systems requiring configurable directionality and tighter timing budgets

Compared with TXS0101DCKR and SN74AVC1T45DBVR, ST1G3234BBJR uniquely combines fixed unidirectional operation, integrated 26Ω output termination, and sub-5ns delay-making it optimal for high-speed, point-to-point, single-direction interfaces where board space and signal integrity are prioritized over direction flexibility.

Availability

ST1G3234BBJR is available at Aetrix Electronics and suitable for mobile baseband interfaces, FPGA I/O bridging, DDR memory address routing, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ST1G3234BBJR 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The ST1G3234 belongs to ST's low-voltage logic translator product line, engineered specifically for energy-efficient, high-speed voltage domain bridging in portable and multi-rail embedded systems.

FAQ

Is ST1G3234BBJR pin-compatible with ST1G3234BJR?

Yes - ST1G3234BBJR and ST1G3234BJR share identical Flip-Chip 5 packaging, pinout (A1/B1/GND/VCCA/VCCB), and electrical specifications. The 'BB' and 'BJ' suffixes denote tape-and-reel packaging variants (4000 vs. 3000 units per reel); no functional or mechanical differences exist between them.

Can ST1G3234BBJR translate from 3.3V to 1.4V?

No - ST1G3234BBJR is unidirectional: B1 is input (VCCB-referenced), A1 is output (VCCA-referenced). To translate from 3.3V to 1.4V, VCCB must be 3.3V and VCCA set to 1.4V. However, VCCA = 1.4V limits VOHA to ≥1.1V (IO = –1mA), which may not meet 1.4V logic-high threshold requirements; verify receiver VIH compatibility.

Does ST1G3234BBJR support hot insertion?

Yes - its power-down protection disables inputs and outputs when either VCCA or VCCB is near 0V, preventing back-current flow and bus contention during live insertion. Combined with ±10mA drive strength and >500mA latch-up immunity, it meets industrial hot-swap reliability requirements.

What is the impact of the 26Ω A-side series resistor on signal rise time?

The 26Ω resistor, combined with typical load capacitance (10–30pF), forms an RC network that limits edge rate: for CL = 15pF, τ ≈ 0.39ns, yielding ~0.9ns 10–90% rise time. This reduces EMI and overshoot without violating 380Mbps timing - verified by measured tPLH/tPHL ≤ 4.4ns under loaded conditions.

ST1G3234BBJR 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:: 1

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:: 5-WFBGA, FCBGA

ST1G3234BBJR FAQ

1.How can I place an order for ST1G3234BBJR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1G3234BBJR 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 ST1G3234BBJR reliable?

The price and inventory of ST1G3234BBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1G3234BBJR is usually 5 days.

3.What payment methods are accepted for ST1G3234BBJR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1G3234BBJR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1G3234BBJR?

ST1G3234BBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1G3234BBJR 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 ST1G3234BBJR?

For technical support, including ST1G3234BBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1G3234BBJR requirements.

6.How does Aetrix verify that ST1G3234BBJR is sourced from the original manufacturer or authorized distributors?

All ST1G3234BBJR 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 ST1G3234BBJR meets industry standards.

7.What is the process for return or replacement of ST1G3234BBJR?

All ST1G3234BBJR units undergo pre-shipment inspection (PSI). If there is an issue with ST1G3234BBJR, 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 ST1G3234BBJR part is unused and in its original packaging.

Return procedure for ST1G3234BBJR:

1.Submit a request within 90 days.

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

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