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

STMicroelectronics 74VCXHQ163245TTR

Name: 74VCXHQ163245TTR
Brand: STMicroelectronics
SKU: 74VCXHQ163245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCXHQ163245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: 74VCXHQ163245TTR.pdf

Description:: IC TRANSCEIVER 48TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VCXHQ163245TTR from STMicroelectronics is a dual-supply 16-bit bus transceiver with level translation, bus hold, and EMI noise control. It interfaces 3.3V/2.5V/1.8V buses bidirectionally, supports VCCA = 2.3–3.6V and VCCB = 1.65–3.6V, delivers tPD ≤ 6.0ns (TA = 85°C), and provides symmetrical drive strength (|IOHA|/IOLA ≥ 2.6mA, |IOHB|/IOLB ≥ 6mA). Used in mixed-voltage motherboard interconnects between CPU and memory subsystems.

For engineers reviewing the 74VCXHQ163245TTR datasheet, 74VCXHQ163245TTR pinout, 74VCXHQ163245TTR application, or 74VCXHQ163245TTR equivalent, key selection criteria include dual-rail voltage tolerance, bus-hold functionality on all inputs, high-impedance isolation during power-down, and controlled rise/fall times (trA/tfA ≥ 4ns) for EMI-sensitive digital backplanes.

Technical Context

This IC implements asynchronous two-way data transfer using independent directional controls (1DIR, 2DIR) and output enables (1G, 2G). Each 8-bit port pair (1A/1B, 2A/2B) operates with separate supply rails-A-side tied to VCCA (2.3–3.6V), B-side to VCCB (1.65–3.6V)-enabling true bidirectional level translation without external biasing.

Input protection includes bus-hold circuits on all A- and B-side data pins, eliminating need for external pull resistors in high-Z states. Power-down protection ensures I/Os remain high-impedance and immune to floating inputs when VCCA or VCCB is unpowered, meeting JESD17 latch-up >500mA and HBM ESD >2000V.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	tPD ≤ 6.0ns max at TA = 85°C, VCCA = 3.0V, VCCB = 2.3V - enables sub-167MHz synchronous bus operation
Supply Voltage Ranges	VCCA = 2.3–3.6V; VCCB = 1.65–3.6V - supports 3.3V↔2.5V, 3.3V↔1.8V, and 2.5V↔1.8V translation
Output Drive Strength	\|IOHA\|/IOLA ≥ 2.6mA at VCCA = 3.0V, VCCB = 1.65V/2.3V; \|IOHB\|/IOLB ≥ 6mA at VCCA = 2.3V/3.0V, VCCB = 1.65V - ensures robust signal integrity across voltage domains
Quiescent Current	ICCA = ICCB ≤ 20µA max at TA = 85°C - enables low-power standby in battery-backed or always-on systems
Rise/Fall Time	trA/tfA ≥ 4ns at CL = 10pF - limits edge-induced EMI in dense PCB layouts
Bus-Hold Current	IIA(HOLD) = ±45µA at VI = 0.7V/1.6V (VCCB = 1.65–2.3V); IIB(HOLD) = ±25µA at VI = 0.57V/1.07V - maintains valid logic state without external resistors
ESD Protection	HBM > 2000V, MM > 200V - meets industrial-grade I/O ruggedness requirements

Pinout & Package

TSSOP48 package: 48-pin thin shrink small outline package with 0.5mm pitch, body size 12.6 × 8.1 mm, lead finish lead-free compliant per RoHS.

Pin/Terminal	Circuit Role	Design Meaning
1, 24, 25, 48	1DIR, 2DIR, 2G, 1G	Directional control and output enable inputs - active-low logic; determine data flow direction and tri-state output behavior
1A1–1A8, 2A1–2A8	A-side I/O (pins 37–47, 26–36)	8-bit bidirectional data interface for VCCA domain - supports 3.3V/2.5V logic levels
1B1–1B8, 2B1–2B8	B-side I/O (pins 2–12, 13–23)	8-bit bidirectional data interface for VCCB domain - supports 1.8V/2.5V logic levels
4, 7, 10, 15, 18, 21, 28, 34, 39, 45	GND	Ground reference for both supply domains - decoupling required per VCCA/VCCB rail
42, 31	VCCA	Primary supply for A-side I/Os and internal logic - must be stable within 2.3–3.6V
7, 18	VCCB	Secondary supply for B-side I/Os - independently regulated; range 1.65–3.6V

Key Features

Feature	Design Value
Dual-supply level translation	Independent VCCA (2.3–3.6V) and VCCB (1.65–3.6V) rails enable seamless 3.3V↔1.8V/2.5V interfacing without external level shifters
Integrated bus-hold	Active on all 32 data pins (A/B sides) - eliminates need for 32 external pull-up/down resistors in high-Z states
EMI-optimized switching	Controlled trA/tfA ≥ 4ns at CL = 10pF reduces broadband noise emission in high-density routing environments
Power-down I/O protection	Inputs and outputs remain high-impedance and ESD-protected even when either VCCA or VCCB is unpowered
Pin-compatible upgrade	Direct replacement for 74-series 16245 with enhanced voltage flexibility, lower power, and bus-hold capability

Applications

Server Memory Interconnect

Industrial PLC Backplane

Use Scenario: Bidirectional data transfer between 3.3V CPU bus and 1.8V DDR2 memory controller in rack-mounted servers.

IC Role / Device Role / Timing Role: Level-translating bus transceiver managing address/data strobes with <6ns propagation delay and bus-hold retention during memory refresh cycles.

Use Value: Eliminates discrete level-shifter arrays and external pull resistors, reducing BOM count by 34 components per channel while maintaining JEDEC timing margins.

Use Scenario: Isolating 2.5V fieldbus controller from 3.3V I/O expansion modules in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Asynchronous bus interface with independent DIR/G enables real-time module hot-swap detection and fault containment.

Use Value: Prevents bus contention during module insertion/removal via power-down protection and high-Z isolation, meeting IEC 61000-4-2 immunity requirements.

Automotive ADAS Sensor Hub

5G Baseband Fronthaul Interface

Use Scenario: Aggregating 1.8V camera sensor streams into a 3.3V SoC vision processor in automotive surround-view systems.

IC Role / Device Role / Timing Role: Low-noise bidirectional translator with EMI-controlled edges ensuring clean pixel clock distribution across multi-layer PCBs.

Use Value: Meets CISPR 25 Class 5 radiated emissions limits without ferrite beads or shielding, simplifying EMC validation.

Use Scenario: Interfacing 2.5V FPGA-based fronthaul processing unit with 3.3V RF transceiver ASICs in massive MIMO radio units.

IC Role / Device Role / Timing Role: High-speed, low-skew (≤0.75ns) bus transceiver enabling deterministic CPRI/ECPRI packet forwarding latency.

Use Value: Achieves <1.5ns total jitter accumulation across 16-bit parallel lanes, preserving 245.76MHz sample clock integrity.

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
SN74AVCH16T245DGGR	Single VCC supply (1.2–3.6V) with auto-direction sensing; no dedicated DIR pins; higher ICC (100µA typ)	Best for space-constrained designs where direction is inferred from data flow; unsuitable for fixed-direction legacy buses	Select when board layout favors auto-bidirectional operation and VCC rail consolidation is prioritized over precise DIR control
74LVC16T245PW	Single 1.65–3.6V supply; no bus-hold; lower drive (24mA), higher tPD (7.2ns max); TSSOP48 pinout identical but no VCCB rail	Applicable only in single-voltage systems; requires external pull resistors and cannot translate between disparate rails	Choose only if system uses uniform 3.3V logic and cost sensitivity outweighs level translation capability

Compared with SN74AVCH16T245DGGR and 74LVC16T245PW, the 74VCXHQ163245TTR uniquely supports true independent dual-rail operation with bus-hold and EMI control-making it the sole option for deterministic, low-noise, mixed-voltage backplane designs requiring pin-level DIR/G control.

Availability

74VCXHQ163245TTR is available at Aetrix Electronics and suitable for server memory interconnects, industrial PLC backplanes, and automotive ADAS sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74VCXHQ163245TTR 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, analog ICs, power management devices, and discrete components for industrial, automotive, and consumer markets.

The VCXH logic family targets high-speed, low-power, mixed-voltage digital interfacing-specifically engineered for next-generation computing, communications, and automotive electronics where signal integrity, EMI control, and voltage domain bridging are critical.

FAQ

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

The absolute maximum rating specifies VCCB ≤ VCCA + 0.5V. Therefore, with VCCA = 2.3V minimum, VCCB may range up to 2.8V; with VCCA = 3.6V maximum, VCCB may reach 4.1V-but operational compliance requires VCCB ≤ 3.6V per recommended conditions. Exceeding VCCA + 0.5V risks permanent damage to internal ESD structures.

Does the bus-hold feature operate when VCCA or VCCB is unpowered?

No. Bus-hold circuitry requires both VCCA and VCCB to be within their specified operating ranges (VCCA ≥ 2.3V, VCCB ≥ 1.65V) to function. During partial power-down, inputs enter high-impedance mode with ESD protection intact, but bus-hold retention is inactive until both supplies stabilize.

Can 74VCXHQ163245TTR drive a 50Ω transmission line directly?

No. Its output drivers are designed for CMOS fanout into capacitive loads (CL ≤ 30pF), not 50Ω DC termination. Driving 50Ω lines would exceed |IO| ratings (±50mA absolute max) and distort waveforms. Use series-terminated drivers or dedicated line drivers for impedance-matched signaling.

Is there a thermal derating requirement for continuous operation at 85°C?

Yes. At TA = 85°C, maximum power dissipation must be limited to 400mW (per Absolute Maximum Ratings), requiring PCB copper area ≥ 250mm² per side under still-air conditions. Derate linearly to 200mW at 125°C ambient, though operation beyond 85°C violates recommended conditions and voids parametric guarantees.

74VCXHQ163245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VCXH

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

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:: 2.6mA, 2.6mA; 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:: 48-TSSOP

74VCXHQ163245TTR FAQ

1.How can I place an order for 74VCXHQ163245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXHQ163245TTR 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 74VCXHQ163245TTR reliable?

The price and inventory of 74VCXHQ163245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXHQ163245TTR is usually 5 days.

3.What payment methods are accepted for 74VCXHQ163245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXHQ163245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCXHQ163245TTR?

74VCXHQ163245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXHQ163245TTR 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 74VCXHQ163245TTR?

For technical support, including 74VCXHQ163245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXHQ163245TTR requirements.

6.How does Aetrix verify that 74VCXHQ163245TTR is sourced from the original manufacturer or authorized distributors?

All 74VCXHQ163245TTR 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 74VCXHQ163245TTR meets industry standards.

7.What is the process for return or replacement of 74VCXHQ163245TTR?

All 74VCXHQ163245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXHQ163245TTR, 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 74VCXHQ163245TTR part is unused and in its original packaging.

Return procedure for 74VCXHQ163245TTR:

1.Submit a request within 90 days.

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

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