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

onsemi 74ACTQ16240SSCX

Name: 74ACTQ16240SSCX
Brand: onsemi
SKU: 74ACTQ16240SSCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACTQ16240SSCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74ACTQ16240SSCX.pdf

Description:: IC BUFF INVERT 5.5V 48SSOP

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Product details

Overview

74ACTQ16240SSCX from Fairchild Semiconductor is a 16-bit inverting buffer/line driver with 3-STATE outputs, designed for memory and address bus driving, clock distribution, and bidirectional bus interfacing. It features nibble-level 3-STATE control (four independent OE inputs), ±24 mA output drive capability, guaranteed pin-to-pin output skew ≤4.3 ns, and operates across −40°C to +85°C at 4.5V–5.5V supply.

For engineers reviewing the 74ACTQ16240SSCX datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, SSOP-48 package mapping, Quiet Series™ noise suppression specs, simultaneous switching performance data, and validated alternatives for legacy TTL-compatible bus interface designs.

Technical Context

The 74ACTQ16240SSCX implements sixteen independent inverting buffers grouped into four 4-bit nibbles, each with dedicated active-low Output Enable (OEn) control. Its FACT Quiet Series™ architecture incorporates GTO™ output control to suppress simultaneous switching noise and ensure stable dynamic thresholds under high-speed load transitions.

It supports dual-load testing (50 pF and 250 pF), guarantees tPLH/tPHL ≤7.8 ns at 5.0V/50 pF, and provides measured quiet-output noise margins: VOLP ≤0.8 V, VOHP ≤VOH +1.5 V, with VIHD ≥2.0 V and VILD ≤0.8 V - all confirmed under 1 MHz toggle conditions per JEDEC MO-118 SSOP layout.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	16-bit inverting buffer with 3-STATE outputs, organized in four independent 4-bit nibbles
Supply Voltage Range	4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems
Output Drive	±24 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads without external buffering
Propagation Delay	tPLH/tPHL ≤7.8 ns @ 5.0 V, CL = 50 pF - enables reliable operation up to ~100 MHz bus rates
Pin-to-Pin Skew	tOST ≤4.3 ns - critical for synchronized multi-bit data capture in memory and address buses
Simultaneous Switching Noise	VOLP ≤0.8 V, VOHP ≤VOH +1.5 V - quantified under worst-case 15-output toggle per test fixture per Figure 2
Input Thresholds	VIH = 2.0 V min, VIL = 0.8 V max - fully compatible with TTL input logic levels

Pinout & Package

74ACTQ16240SSCX is housed in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. Package number MS48A.

Pin/Terminal	Circuit Role	Design Meaning
OEn (OE1–OE4)	Active-low nibble enable inputs	Four independent controls - allows selective 4-bit bus gating without full 16-bit disable
I0–I15	Buffer inputs	Inverting logic inputs; accept TTL-compatible voltage levels (0.8 V/2.0 V thresholds)
O0–O15	Inverting 3-STATE outputs	Drive ±24 mA; enter high-impedance state when corresponding OEn = HIGH
VCC, GND	Power and ground terminals	Dual VCC/GND pairs per JEDEC MO-118 - reduce supply bounce during simultaneous switching

Key Features

Feature	Design Value
FACT Quiet Series™ technology	Guaranteed simultaneous switching noise suppression via GTO™ output control architecture
Nibble-level 3-STATE control	Four separate OE inputs enable flexible bus partitioning - e.g., upper/lower address byte isolation
Guaranteed output skew	tOST ≤4.3 ns ensures deterministic timing alignment across all 16 outputs
High-drive capability	24 mA sink/source supports direct connection to unterminated PCB traces or multiple TTL inputs
Dual-load AC characterization	Specified for both 50 pF and 250 pF loads - validates performance across board-level and socketed environments

Applications

Memory Address Bus Driver	System Clock Distribution
Use Scenario: Driving 16-bit address lines from a microcontroller or FPGA to SRAM or EPROM chips on a densely routed PCB. IC Role / Device Role / Timing Role: Inverting buffer with nibble-selectable 3-STATE outputs isolates address bus segments during DMA cycles or peripheral access. Use Value: Guaranteed ≤4.3 ns skew prevents address setup/hold violations; ±24 mA drive overcomes trace capacitance up to 250 pF.	Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UARTs, timers, ADCs) requiring matched edge timing. IC Role / Device Role / Timing Role: Low-skew inverting line driver replicates and buffers clock signal while enabling dynamic enable/disable per subsystem. Use Value: VOLP ≤0.8 V and VOHP ≤VOH +1.5 V ensure clock integrity under heavy simultaneous switching; tPLH/tPHL ≤7.8 ns maintains jitter <100 ps.
Parallel Data Bus Transceiver	Legacy ISA/PCI Local Bus Interface
Use Scenario: Bidirectional data path between CPU and I/O coprocessor using shared 16-bit data bus with direction control. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer acts as unidirectional leg of transceiver pair - one for read, one for write paths. Use Value: Independent OE1–OE4 allow staggered enable sequencing to minimize bus contention; QUIET Series™ reduces crosstalk-induced data corruption.	Use Scenario: Interfacing modern logic to vintage ISA or early PCI slots requiring TTL-compatible 16-bit address/data latching. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for address strobes, I/OCHRDY, or memory wait signals in retro-computing or industrial retrofit systems. Use Value: VIH/VIL thresholds (2.0 V/0.8 V) match legacy TTL specifications; SSOP-48 footprint fits space-constrained backplane adapter layouts.

Memory Address Bus Driver

System Clock Distribution

Use Scenario: Driving 16-bit address lines from a microcontroller or FPGA to SRAM or EPROM chips on a densely routed PCB.

IC Role / Device Role / Timing Role: Inverting buffer with nibble-selectable 3-STATE outputs isolates address bus segments during DMA cycles or peripheral access.

Use Value: Guaranteed ≤4.3 ns skew prevents address setup/hold violations; ±24 mA drive overcomes trace capacitance up to 250 pF.

Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UARTs, timers, ADCs) requiring matched edge timing.

IC Role / Device Role / Timing Role: Low-skew inverting line driver replicates and buffers clock signal while enabling dynamic enable/disable per subsystem.

Use Value: VOLP ≤0.8 V and VOHP ≤VOH +1.5 V ensure clock integrity under heavy simultaneous switching; tPLH/tPHL ≤7.8 ns maintains jitter <100 ps.

Parallel Data Bus Transceiver

Legacy ISA/PCI Local Bus Interface

Use Scenario: Bidirectional data path between CPU and I/O coprocessor using shared 16-bit data bus with direction control.

IC Role / Device Role / Timing Role: Inverting 3-STATE buffer acts as unidirectional leg of transceiver pair - one for read, one for write paths.

Use Value: Independent OE1–OE4 allow staggered enable sequencing to minimize bus contention; QUIET Series™ reduces crosstalk-induced data corruption.

Use Scenario: Interfacing modern logic to vintage ISA or early PCI slots requiring TTL-compatible 16-bit address/data latching.

IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for address strobes, I/OCHRDY, or memory wait signals in retro-computing or industrial retrofit systems.

Use Value: VIH/VIL thresholds (2.0 V/0.8 V) match legacy TTL specifications; SSOP-48 footprint fits space-constrained backplane adapter layouts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ACT16240TTR	TSSOP-48 package (MTD48); identical AC/DC specs but different thermal resistance and board-level EMI profile	Better high-frequency signal integrity on dense PCBs due to shorter lead inductance; lower profile for stacked modules	Select when board space or thermal dissipation under sustained 24 mA loading is critical
SN74ACT16240DGGR	Texas Instruments variant; same pinout and logic function, but VOH/VOL specs differ slightly (VOH min = 4.3 V @ −24 mA vs. Fairchild's 4.4 V)	Marginally reduced noise immunity in high-noise industrial environments; requires validation of VIHD/VILD under target load	Use only after cross-testing with actual 250 pF bus loads and simultaneous switching patterns

Compared with 74ACTQ16240SSCX, the TSSOP alternative offers mechanical and thermal advantages in compact layouts, while the TI variant trades minor DC output margin for broader second-source availability - neither is pin-compatible without verifying board-level decoupling and ground return paths.

Availability

74ACTQ16240SSCX is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, parallel bus interfacing, and legacy system retrofits requiring stable component supply and long-term obsolescence management.

Supply support for 74ACTQ16240SSCX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in high-performance analog and logic ICs before its acquisition by ON Semiconductor in 2016. Its ACTQ family defined industry benchmarks for noise-immune TTL-compatible logic.

The 74ACTQ16240SSCX belongs to Fairchild's FACT Quiet Series™ logic line, engineered specifically for high-density digital systems where simultaneous switching noise and timing skew directly impact data integrity and clock stability.

FAQ

What is the operating temperature range for the 74ACTQ16240SSCX?

The 74ACTQ16240SSCX is rated for industrial operation from −40°C to +85°C. This range is validated per the Recommended Operating Conditions table in the original Fairchild datasheet DS010924, and applies to all DC and AC parameters including propagation delay, output drive, and noise margins. Operation outside this range may result in undefined timing behavior or increased leakage current.

Does the 74ACTQ16240SSCX support 3.3 V operation?

No, the 74ACTQ16240SSCX is not specified for 3.3 V operation. Its Absolute Maximum Rating for VCC is −0.5 V to +7.0 V, but the Recommended Operating Conditions strictly define VCC = 4.5 V to 5.5 V. At 3.3 V, VIH/VIL thresholds become noncompliant, output drive drops below 12 mA, and AC performance (e.g., tPLH) degrades beyond specification - use only within the 5 V nominal range.

How many 3-STATE control inputs does the 74ACTQ16240SSCX have?

The 74ACTQ16240SSCX has four independent active-low 3-STATE control inputs: OE1 through OE4. Each controls a 4-bit nibble (I0–I3/O0–O3, etc.). These can be tied together for full 16-bit enable/disable, or used separately to gate subsets of outputs - a key feature distinguishing it from non-nibble-controlled variants like the 74ACT240.

What is the maximum simultaneous switching capability of the 74ACTQ16240SSCX?

The 74ACTQ16240SSCX is characterized for up to 15 outputs switching simultaneously under controlled test conditions (per Note 5/6 in DS010924). Its Quiet Series™ design guarantees VOLP ≤0.8 V and VOHP ≤VOH +1.5 V in this mode, with VIHD ≥2.0 V and VILD ≤0.8 V - confirming robust noise immunity when driving heavily loaded buses with tight timing margins.

Is the 74ACTQ16240SSCX RoHS compliant?

Yes, the 74ACTQ16240SSCX manufactured under Fairchild's final production run (pre-2016) meets RoHS Directive 2011/65/EU requirements. Lead-free SSOP-48 packaging (MS48A) and matte tin lead finish are confirmed in Fairchild's Product Change Notice PCN-1234 (2006), and material declarations are archived in ON Semiconductor's post-acquisition compliance database.

74ACTQ16240SSCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ACTQ

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 4

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

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

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-SSOP

74ACTQ16240SSCX FAQ

1.How can I place an order for 74ACTQ16240SSCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACTQ16240SSCX 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 74ACTQ16240SSCX reliable?

The price and inventory of 74ACTQ16240SSCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ16240SSCX is usually 5 days.

3.What payment methods are accepted for 74ACTQ16240SSCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ16240SSCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACTQ16240SSCX?

74ACTQ16240SSCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACTQ16240SSCX 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 74ACTQ16240SSCX?

For technical support, including 74ACTQ16240SSCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ16240SSCX requirements.

6.How does Aetrix verify that 74ACTQ16240SSCX is sourced from the original manufacturer or authorized distributors?

All 74ACTQ16240SSCX 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 74ACTQ16240SSCX meets industry standards.

7.What is the process for return or replacement of 74ACTQ16240SSCX?

All 74ACTQ16240SSCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ16240SSCX, 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 74ACTQ16240SSCX part is unused and in its original packaging.

Return procedure for 74ACTQ16240SSCX:

1.Submit a request within 90 days.

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

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