74ACTQ16240MTDX Equivalent & Substitute Parts

Part Overview

The 74ACTQ16240MTDX is a 4-element, 4-bit inverting buffer IC with 3-state output capability, manufactured by onsemi in a 48-TSSOP 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 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)
Mounting Type	Surface Mount
Package / Case	48-TFSOP (0.240", 6.10mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ16240MTDX are categorized based on strict electrical and mechanical parameter alignment:

Electrical Compatibility Criteria:

Logic type: Buffer, Inverting (4 elements, 4 bits per element)
Output configuration: 3-State
Output current: 24mA high and low
Supply voltage range: 4.5V ~ 5.5V
Operating temperature: -40°C ~ 85°C

Mechanical Compatibility Criteria:

Mounting type: Surface Mount
Package compatibility: 48-pin TSSOP or 48-pin SSOP variants
Moisture sensitivity: MSL 1 (Unlimited)

Substitution Categories:

Direct Package Equivalent (48-TSSOP): 74FCT162240ATPACT maintains identical package footprint and electrical specifications.
Package Variant Equivalent (48-SSOP): 74ACT16240DL and 74ACT16240DLR use 48-SSOP packaging (0.295" width vs. 0.240" width), requiring PCB layout verification but maintaining full electrical compatibility.

Parameter Comparison

Parameter	74ACTQ16240MTDX (Main)	74ACT16240DL	74ACT16240DLR	74FCT162240ATPACT
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	48-TFSOP (0.240", 6.10mm)	48-BSSOP (0.295", 7.50mm)	48-BSSOP (0.295", 7.50mm)	48-TFSOP (0.240", 6.10mm)
Product Status	Obsolete	Last Time Buy	Active	Obsolete
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification): The 74FCT162240ATPACT is the preferred substitute, maintaining identical 48-TFSOP package dimensions and all electrical specifications. This part requires no PCB layout changes and provides full functional compatibility.

For Active Production Designs: The 74ACT16240DLR is recommended as the primary long-term substitute. This part carries Active product status from Texas Instruments, ensuring continued availability and supply chain stability. The 48-SSOP package requires PCB footprint verification due to increased width (0.295" vs. 0.240"), but electrical performance is fully equivalent.

For Legacy Support: The 74ACT16240DL remains available as a secondary option with Last Time Buy status, suitable for near-term production runs where supply is confirmed.

Compliance Considerations: All substitute parts meet ROHS3 compliance and REACH requirements, supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the 74ACT16240DL or 74ACT16240DLR be used as direct drop-in replacements for the 74ACTQ16240MTDX?

A: Electrically, yes. Both parts are fully compatible in terms of logic function, output current, supply voltage, and operating temperature. However, the 48-SSOP package (0.295" width) differs from the 48-TFSOP package (0.240" width) of the main part. PCB layout verification is required to confirm pad spacing and trace routing compatibility before implementation.

Q: What is the difference between 74ACT16240DL and 74ACT16240DLR?

A: Both parts are electrically identical with the same 48-SSOP package. The primary difference is packaging format: 74ACT16240DL is supplied in Tube packaging, while 74ACT16240DLR is supplied in Tape & Reel format. The 74ACT16240DLR carries Active product status, providing superior long-term availability compared to the Last Time Buy status of the 74ACT16240DL.

Q: Is the 74FCT162240ATPACT a suitable alternative?

A: Yes. The 74FCT162240ATPACT maintains the identical 48-TFSOP package footprint and all electrical specifications of the 74ACTQ16240MTDX. This part requires no PCB modifications and provides seamless compatibility. However, it carries Obsolete product status, so supply availability should be confirmed before design commitment.

Q: Are there any differences in output drive capability between these parts?

A: No. All substitute parts deliver identical output current specifications: 24mA high and 24mA low. Load driving capability is equivalent across all listed alternatives.

Q: What packaging considerations apply when switching from 74ACTQ16240MTDX to 74ACT16240DL/DLR?

A: The primary consideration is package width: 48-TFSOP is 0.240" (6.10mm) wide, while 48-SSOP is 0.295" (7.50mm) wide. Verify that PCB pad spacing, trace routing, and component placement accommodate the wider package before production implementation. Pin count and pitch remain consistent at 48 pins.

Q: Do all substitute parts meet current environmental and compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, meeting current manufacturing and environmental requirements. The main part (74ACTQ16240MTDX) is REACH unaffected but predates ROHS3 classification due to its obsolete status.

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