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

STMicroelectronics 74AC16245TTR

Name: 74AC16245TTR
Brand: STMicroelectronics
SKU: 74AC16245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AC16245TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74AC16245TTR.pdf

Description:: IC TXRX NON-INVERT 6V 48TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,495

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Product details

Overview

74AC16245TTR from STMicroelectronics is a 16-bit non-inverting bus transceiver with 3-state outputs, designed for bidirectional asynchronous data bus interfacing between two independent systems. It features directional control (DIR), dual output-enable inputs (1G/2G), symmetrical drive strength (±24 mA), 4.5 ns typical propagation delay at 5 V, and operates across 2–6 V supply range.

For engineers reviewing the 74AC16245TTR datasheet, 74AC16245TTR pinout, 74AC16245TTR application, or 74AC16245TTR equivalent, key selection criteria include bus isolation capability, high-noise immunity (28% VCC), power-down input protection, balanced tPLH/tPHL timing, and TSSOP-48 package compatibility with legacy 74-series layouts.

Technical Context

This device implements dual 8-bit bidirectional data paths controlled independently by DIR and G signals: 1A↔1B (controlled by 1DIR/1G) and 2A↔2B (controlled by 2DIR/2G). Direction is determined solely by DIR logic level, while G asserts high-impedance on all outputs when active low.

It uses sub-micron C2MOS technology to achieve low ICC (4 µA max at 25°C), ESD-hardened I/O (2 kV HBM), and latch-up immunity. All inputs tolerate voltages up to VCC + 0.5 V, and floating bus terminals in high-Z state must be externally biased.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	4.5 ns typical at VCC = 5 V - enables high-speed synchronous bus handshaking up to ~100 MHz system clock domains
Supply Voltage Range	2 V to 6 V - supports mixed-voltage interconnect between 3.3 V and 5 V subsystems without level shifters
Output Drive Strength	±24 mA min - drives standard TTL loads and 50 pF transmission lines with clean edges under load
Noise Immunity	VNIH/VNIL ≥ 28% VCC - rejects common-mode noise on shared PCB traces in industrial backplanes
Quiescent Current	4 µA max at TA = 25°C - enables low-power standby in battery-backed or energy-sensitive applications
ESD Protection	2 kV HBM - meets IEC 61000-4-2 Level 2 for board-level handling and system integration
Operating Temperature	−55°C to +125°C - qualified for extended-temperature automotive and industrial control environments

Pinout & Package

TSSOP-48 package: 48-pin thin shrink small outline package, 12.6 mm × 8.1 mm body, 0.5 mm pitch, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	DIR (Direction Control)	Active-high signal selecting data flow direction per bus pair (1A↔1B or 2A↔2B)
4, 10, 15, 21, 28, 34, 39, 45	GND	Reference ground for all I/O and internal logic; requires low-inductance connection to minimize switching noise
7, 18, 31, 42	VCC	Primary power supply for core logic and I/O drivers; decoupling capacitor required at each VCC pin
48, 25	G (Output Enable)	Active-low enable controlling 3-state output drivers; assertion isolates both A and B buses simultaneously
2–3, 5–6, 8–9, 11–12, 26–27, 29–30, 32–33, 35–36, 38, 40–41, 43–44, 46–47	A/B Data I/O	Bidirectional data terminals grouped as 1A1–1A8 / 1B1–1B8 and 2A1–2A8 / 2B1–2B8; no internal pull-ups/downs

Key Features

Feature	Design Value
Pin- and function-compatible with 74LS16245	Direct drop-in replacement for legacy TTL bus transceivers without redesigning PCB layout or firmware
Symmetrical output impedance	Equal \|IOH\| and IOL (≥24 mA) ensures matched rise/fall times and reduced signal skew across all 16 bits
Power-down input protection	All inputs remain functional and protected even when VCC = 0 V - prevents back-driving damage during hot-swap or partial power-down
Balanced propagation delays	tPLH ≈ tPHL minimizes duty-cycle distortion in clock-forwarding or strobe-based bus protocols
High noise immunity	VIH/VIL thresholds defined as percentages of VCC - maintains logic integrity across wide supply tolerances and noisy rails

Applications

Industrial PLC Backplane Interface

Automotive Body Control Module

Use Scenario: Interfacing microcontroller local bus to distributed I/O expansion cards over 20 cm PCB traces.

IC Role / Device Role / Timing Role: Bidirectional level-translating buffer enabling isolated read/write cycles between 3.3 V MCU and 5 V peripheral modules.

Use Value: 4.5 ns propagation delay and ±24 mA drive ensure setup/hold timing margins are met at 25 MHz bus clock rates.

Use Scenario: Connecting door module MCU to central gateway via shared CAN-adjacent diagnostic bus.

IC Role / Device Role / Timing Role: Bus isolator preventing ground loop currents and transient coupling between subsystems during ESD events.

Use Value: 2 kV HBM ESD rating and −55°C to +125°C operation meet ISO 10605 and AEC-Q100 Grade 1 requirements.

Test Equipment Digital Pattern Generator

Medical Imaging Data Acquisition Board

Use Scenario: Driving parallel digital stimulus patterns to DUT pins with precise edge alignment across 16 channels.

IC Role / Device Role / Timing Role: Synchronized output driver providing matched tPLH/tPHL to eliminate channel-to-channel skew.

Use Value: Balanced propagation delays (tPLH ≈ tPHL) maintain ≤100 ps inter-channel skew at 100 Mbps data rate.

Use Scenario: Isolating FPGA-based image preprocessing engine from analog sensor interface ASICs on same PCB.

IC Role / Device Role / Timing Role: 3-state bus transceiver enabling time-multiplexed access to shared memory and sensor registers.

Use Value: Low ICC (4 µA max) reduces static power in always-on diagnostic subsystems without compromising bus turnaround latency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AC16245DGGR	Same AC logic family, identical electrical specs, but offered in VQFN-48 (0.5 mm pitch, exposed thermal pad)	Requires reflow profile adjustment and thermal pad soldering; better thermal performance in high-density layouts	Select for space-constrained designs needing improved θJA or automated optical inspection compatibility
74LVC16245APAG	Lower VCC range (1.65–3.6 V), lower drive (±24 mA only at 3.3 V), higher ICC (10 µA typ)	Not suitable for 5 V systems; optimized for ultra-low-voltage mobile or portable interfaces	Select only for 3.3 V-only designs where 5 V tolerance and extended temperature range are not required

Compared with SN74AC16245DGGR and 74LVC16245APAG, the 74AC16245TTR uniquely supports full 2–6 V operation with guaranteed 5 V interoperability, TSSOP-48 footprint compatibility with legacy tooling, and lowest quiescent current among pin-compatible alternatives.

Availability

74AC16245TTR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and medical imaging data acquisition boards requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 74AC16245TTR 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 microcontrollers, power management, sensors, and discrete components for industrial, automotive, and consumer markets.

The 74AC logic family targets high-speed, low-power digital interfacing in noise-prone environments, emphasizing robustness, voltage flexibility, and direct compatibility with legacy 74-series designs.

FAQ

What is the maximum recommended capacitive load for reliable 74AC16245TTR operation?

The device is characterized with CL = 50 pF and RL = 500 Ω per output. Driving loads beyond 50 pF increases propagation delay and may cause overshoot or undershoot exceeding 0.1 V. For >50 pF, series termination or reduced slew rate via external RC filtering is advised to maintain signal integrity.

Can 74AC16245TTR operate with VCC = 3.3 V while interfacing to 5 V logic?

No - the 74AC16245TTR is not 5 V tolerant at 3.3 V supply. Its VIH minimum is 2.1 V at VCC = 3.3 V, but 5 V inputs exceed absolute maximum VI rating (−0.5 V to VCC + 0.5 V = 3.8 V). A level-shifting solution is required for mixed-voltage interconnect.

How does the dual G (1G/2G) enable structure improve system design?

The separate 1G and 2G inputs allow independent control of each 8-bit bus segment. This enables selective isolation - e.g., holding one bus active while tri-stating the other - supporting time-multiplexed memory mapping or fault containment without full system reset.

Is the 74AC16245TTR suitable for hot-swap applications?

Yes - its power-down input protection ensures inputs remain safe even when VCC = 0 V. However, outputs enter high-Z only after G is asserted; thus, hot-insertion requires external circuitry to hold G low until VCC stabilizes and DIR is initialized to prevent bus contention.

74AC16245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74AC

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74AC16245TTR FAQ

1.How can I place an order for 74AC16245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AC16245TTR 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 74AC16245TTR reliable?

The price and inventory of 74AC16245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16245TTR is usually 5 days.

3.What payment methods are accepted for 74AC16245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AC16245TTR?

74AC16245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AC16245TTR 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 74AC16245TTR?

For technical support, including 74AC16245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16245TTR requirements.

6.How does Aetrix verify that 74AC16245TTR is sourced from the original manufacturer or authorized distributors?

All 74AC16245TTR 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 74AC16245TTR meets industry standards.

7.What is the process for return or replacement of 74AC16245TTR?

All 74AC16245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16245TTR, 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 74AC16245TTR part is unused and in its original packaging.

Return procedure for 74AC16245TTR:

1.Submit a request within 90 days.

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

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