74ACTQ16240SSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ16240SSCX is a 4-element, 4-bit inverting buffer logic IC with 3-state output capability, manufactured by onsemi in a 48-SSOP surface mount package. This component operates across a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	4
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	48-BSSOP (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ16240SSCX are qualified based on strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Logic type: Buffer, Inverting (4 element, 4 bit per element configuration)
Output type: 3-State
Output current capability: 24mA high and low
Supply voltage range: 4.5V ~ 5.5V
Operating temperature range: -40°C ~ 85°C
Package: 48-BSSOP surface mount
Moisture sensitivity: MSL 1 (Unlimited)

All identified substitutes maintain identical electrical specifications and physical packaging, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Parameter	74ACTQ16240SSCX (onsemi)	74ACT16240DL (TI)	74ACT16240DLR (TI)	74FCT162240CTPVCT (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Series	74ACTQ	74ACT	74ACT	74FCT
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	4	4	4	4
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	48-BSSOP	48-BSSOP	48-BSSOP	48-BSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Last Time Buy	Active	Obsolete
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

74ACT16240DLR (Texas Instruments) is the primary recommended substitute. This part maintains active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification and is available in Tape & Reel packaging with 1416 units in current inventory.

74ACT16240DL (Texas Instruments) serves as a secondary option with Last Time Buy status. This variant is available in Tube packaging and maintains full electrical and mechanical compatibility. With 1132 units in inventory, it provides near-term availability but represents a declining product line.

74FCT162240CTPVCT (Texas Instruments) is a parametric equivalent from the 74FCT series. Although classified as obsolete, it maintains identical electrical specifications and package configuration. This option is suitable only when 74ACT alternatives are unavailable, with 1900 units currently in stock.

All three substitutes are REACH compliant and carry identical MSL ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16240DL and 74ACT16240DLR be used interchangeably with 74ACTQ16240SSCX?

A: Yes. Both Texas Instruments 74ACT variants maintain identical electrical parameters (4-element, 4-bit inverting buffer, 3-state output, 24mA drive capability, 4.5V–5.5V supply, -40°C to 85°C operating range) and physical packaging (48-BSSOP surface mount). The primary difference is packaging format: DL uses Tube, while DLR uses Tape & Reel.

Q: What is the difference between 74ACT and 74FCT series substitutes?

A: Both series provide identical electrical specifications for this application. The 74FCT162240CTPVCT differs only in manufacturer logic family designation. Selection between 74ACT and 74FCT should be based on product status and inventory availability, as both meet all functional requirements.

Q: Why is 74ACT16240DLR recommended over 74ACT16240DL?

A: 74ACT16240DLR maintains active product status, ensuring continued manufacturing and supply availability. 74ACT16240DL is classified as Last Time Buy, indicating a declining product line with limited future availability.

Q: Are there any package or pinout differences between these substitutes?

A: No. All substitutes use the 48-BSSOP package with identical 0.295" width and 7.50mm dimensions. Pinout and electrical interface are fully compatible.

Q: What is the MSL rating significance for these parts?

A: All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard storage and handling procedures apply without special environmental controls.

Q: Are these parts RoHS compliant?

A: The 74ACT variants (74ACT16240DL and 74ACT16240DLR) are ROHS3 compliant. The 74FCT162240CTPVCT is ROHS3 compliant. All parts are REACH unaffected. Compliance certifications support use in regulated manufacturing environments.

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