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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74VCXH1632245TBR

Name: 74VCXH1632245TBR
Brand: STMicroelectronics
SKU: 74VCXH1632245TBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCXH1632245TBR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 42-TFBGA

Datasheet:: 74VCXH1632245TBR.pdf

Description:: IC TRANS DUAL 16BIT RES 42TFBGA

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Product details

Overview

74VCXH1632245TBR from STMicroelectronics is a dual-supply 16-bit bus transceiver and level translator designed for bidirectional voltage translation between 3.3V/2.5V A-side buses and 1.8V/2.5V B-side buses. It features 48-pin µTFBGA packaging, 4.4ns max propagation delay at 85°C, ±6mA to ±8mA drive strength per I/O, bus hold on all data inputs, and integrated series resistors on the A-side to dampen signal reflections.

For engineers reviewing the 74VCXH1632245TBR datasheet, 74VCXH1632245TBR pinout, 74VCXH1632245TBR application, or 74VCXH1632245TBR equivalent, this device supports mixed-voltage system interconnects in FPGA-to-ASIC interfaces, memory subsystem bridging, and low-power portable SoC designs where supply domain isolation and ESD-hardened I/O are critical.

Technical Context

This transceiver implements two independent 8-bit bidirectional data paths (1A↔1B and 2A↔2B), each controlled by dedicated DIR and G enable inputs. Direction control is asynchronous and non-latched; data flows transparently when enabled, with high-impedance isolation when disabled.

It uses sub-micron C2MOS technology with five-layer metal interconnect to achieve symmetrical tPLH/tPHL delays and balanced output impedance across both supply domains (VCCA = 2.3–3.6V, VCCB = 1.65–2.7V). Input protection includes 2kV HBM ESD rating and power-down leakage suppression on all pins.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.4ns max (tPD) at TA=85°C, VCCA=3.0V, VCCB=2.3V - enables sub-225MHz data throughput in synchronous bus systems
Supply Voltage Range	VCCA = 2.3–3.6V; VCCB = 1.65–2.7V - supports 3.3V↔2.5V, 3.3V↔1.8V, and 2.5V↔1.8V level translation
Output Drive Strength	\|IOHA\|/IOLA = 8mA min at VCCA=3.0V/VCCB=1.65V or 2.3V; \|IOHB\|/IOLB = 6mA min at VCCB=1.65V - ensures robust signal integrity into 50Ω loads
Quiescent Current	ICCA = ICCB = 20µA max at TA=85°C - enables ultra-low standby power in battery-backed or always-on subsystems
ESD Protection	HBM > 2000V, MM > 200V - eliminates need for external TVS diodes in handheld and industrial edge nodes
Bus Hold Current	IIB(HOLD) = ±45µA at VCCB=1.65–2.3V - maintains valid logic states on floating data lines without pull resistors
Input Capacitance	CINB = 5pF, CI/O = 6pF - minimizes capacitive loading on high-speed source drivers and reduces timing skew

Pinout & Package

74VCXH1632245TBR is packaged in a 42-ball µTFBGA (1.0mm × 1.1mm × 0.5mm height) with 0.5mm ball pitch, optimized for space-constrained mobile and wearable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1A1–1A8, 2A1–2A8	A-side bidirectional data I/O	Connect to higher-voltage bus (VCCA domain); include series damping resistors on A-side traces
1B1–1B8, 2B1–2B8	B-side bidirectional data I/O	Interface to lower-voltage bus (VCCB domain); no internal series resistance
1DIR, 2DIR	Direction control input	Low = A→B transfer; High = B→A transfer; referenced to VCCB
1G, 2G	Output enable input	Low = enable transceiver; High = place A/B ports in high-impedance state
VCCA, VCCB	Independent power supplies	VCCA powers A-side I/O; VCCB powers B-side I/O and control logic - decoupling required per supply
GND	Ground reference	Common return for both supply domains; requires low-inductance connection to PCB ground plane

Key Features

Feature	Design Value
Asymmetric dual-supply operation	Supports simultaneous 3.3V↔1.8V translation without external level-shifting components
Integrated A-side series resistors	Reduces signal overshoot/ringing on fast-switching 3.3V buses, eliminating discrete 22–33Ω resistors
Bus-hold circuitry on all data inputs	Maintains last-valid logic state during bus contention or hot-plug events; removes need for external pull-ups
Power-down protection	Prevents back-driving and leakage current when either VCCA or VCCB is unpowered - safe for partial-power-down modes
Latch-up immunity	Exceeds 500mA per JESD17 - ensures reliability in noisy industrial environments with transient coupling

Applications

Mobile Baseband Processor Interface

FPGA-to-ASIC Memory Bridge

Use Scenario: Interfacing a 3.3V baseband processor's parallel data bus to a 1.8V RF transceiver ASIC in LTE/Wi-Fi modules.

IC Role / Device Role / Timing Role: Bidirectional level translator managing command/data flow between voltage domains while preserving setup/hold timing margins.

Use Value: Eliminates discrete resistor networks and external bus-hold ICs, reducing BOM count by 7 parts and PCB area by 12mm².

Use Scenario: Connecting a 2.5V FPGA I/O bank to a 1.8V DDR2 SDRAM controller in embedded vision systems.

IC Role / Device Role / Timing Role: Synchronous bus transceiver providing matched tPLH/tPHL delays (<0.75ns skew) to meet DDR2 tDS/tDH requirements.

Use Value: Enables direct interface without timing closure penalties; 20µA quiescent current extends runtime in always-on video buffer applications.

Industrial PLC I/O Module

Wearable Sensor Hub

Use Scenario: Isolating a 3.3V microcontroller's GPIO expansion bus from 2.5V analog front-end ADCs/DACs in programmable logic controllers.

IC Role / Device Role / Timing Role: Voltage-domain firewall with power-down protection - prevents fault propagation when VCCB rail fails.

Use Value: Meets IEC 61000-4-2 Level 4 ESD immunity (±8kV contact) without added protection circuitry.

Use Scenario: Linking a 3.3V Bluetooth SoC to multiple 1.8V MEMS sensors (accelerometer, gyroscope, environmental) in hearables.

IC Role / Device Role / Timing Role: Low-capacitance (6pF) bidirectional translator minimizing signal degradation on 10MHz sensor SPI buses.

Use Value: µTFBGA42 package (1.0×1.1mm) fits within 2.5mm² footprint constraints; bus-hold retains sensor configuration during sleep mode.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVCH16T245RJR	Higher drive (12mA), wider VCCA/VCCB range (1.2–3.6V), no A-side series resistors	Better for high-speed (>100MHz) buses requiring stronger drive; lacks built-in termination	Select when external series resistors are acceptable and higher bandwidth is prioritized over board area
TXB0108PWR	Auto-direction sensing, lower drive (4mA), no bus-hold, smaller 20-pin TSSOP	Suitable for UART/I2C translation; unsuitable for wide parallel buses or contention-prone systems	Choose only for narrow serial interfaces where direction control overhead must be eliminated

Compared with SN74AVCH16T245RJR and TXB0108PWR, the 74VCXH1632245TBR uniquely combines A-side series termination, bus-hold, and 8-bit dual-path independence - making it optimal for space-constrained parallel bus translation where signal integrity and pin count efficiency are critical.

Availability

74VCXH1632245TBR is available at Aetrix Electronics and suitable for mobile baseband interfaces, FPGA memory bridges, industrial PLC I/O modules, and wearable sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74VCXH1632245TBR 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 automotive, industrial, and consumer ICs with emphasis on power efficiency, reliability, and system integration.

The 74VCXH1632245 belongs to ST's VCXH ultra-low-voltage logic family, engineered specifically for mixed-supply system interconnects in portable and energy-sensitive applications where voltage translation, ESD robustness, and minimal board area are design priorities.

FAQ

Can 74VCXH1632245TBR operate with VCCA = 3.3V and VCCB = 1.8V simultaneously?

Yes - the device is explicitly characterized for VCCA = 3.3V ±0.3V and VCCB = 1.8V ±0.15V operation across −40°C to +85°C. DC specifications including VIHB, VOLB, and VOHB are guaranteed under this condition, and dynamic parameters like tPLH ≤ 4.4ns remain valid per Table 8.

Does the µTFBGA42 package require special PCB layout considerations?

Yes - the 0.5mm ball pitch and 1.0×1.1mm body demand 4mil trace/space routing, microvia-in-pad or solder-mask-defined pads, and strict thermal profile control during reflow. STMicroelectronics Application Note AN2907 specifies recommended land pattern dimensions, stencil aperture ratios, and solder paste volume targets for reliable assembly.

What happens to outputs when VCCA is powered but VCCB is 0V?

All B-side outputs enter high-impedance state with <±10µA power-off leakage (IOFF), and A-side outputs remain functional if their inputs are within VCCA-referenced VIH/VIL thresholds. The device's power-down protection prevents reverse current flow, satisfying JEDEC JESD78 latch-up immunity requirements.

Is bus-hold active on both A-side and B-side inputs?

Bus-hold is provided on all data inputs - both A-side (1A1–1A8, 2A1–2A8) and B-side (1B1–1B8, 2B1–2B8) - with specified hold current of ±45µA at VCCB = 1.65–2.3V and ±75µA at VCCA = 2.3–3.6V. Control inputs (DIR, G) do not feature bus-hold.

74VCXH1632245TBR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VCXH

Package/Case:: 42-TFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Translation Transceiver

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA; 18mA, 18mA

Voltage - Supply:: 1.65V ~ 2.7V, 2.3V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 42-TFBGA (4x3.5)

74VCXH1632245TBR FAQ

1.How can I place an order for 74VCXH1632245TBR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXH1632245TBR 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 74VCXH1632245TBR reliable?

The price and inventory of 74VCXH1632245TBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH1632245TBR is usually 5 days.

3.What payment methods are accepted for 74VCXH1632245TBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH1632245TBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCXH1632245TBR?

74VCXH1632245TBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXH1632245TBR 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 74VCXH1632245TBR?

For technical support, including 74VCXH1632245TBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH1632245TBR requirements.

6.How does Aetrix verify that 74VCXH1632245TBR is sourced from the original manufacturer or authorized distributors?

All 74VCXH1632245TBR 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 74VCXH1632245TBR meets industry standards.

7.What is the process for return or replacement of 74VCXH1632245TBR?

All 74VCXH1632245TBR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH1632245TBR, 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 74VCXH1632245TBR part is unused and in its original packaging.

Return procedure for 74VCXH1632245TBR:

1.Submit a request within 90 days.

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

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