SN74HC240DBR Equivalent & Substitute Parts

Part Overview

The SN74HC240DBR is an inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 2V to 6V supply voltage operation. This device functions as a 2-element, 4-bit inverting buffer with 3-state output capability in a 20-SSOP surface mount package. The product maintains active status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified to address inventory availability, extended operating temperature ranges, or alternative packaging formats while maintaining functional and electrical equivalence within the 74HC240 logic family.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature (TA)	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC240DBR is determined by the following core parameters:

Logic type, element count, and bit configuration must remain constant (Buffer, Inverting; 2 elements; 4 bits per element)
Output type must be 3-State
Output current specifications must match (7.8mA, 7.8mA)
Supply voltage range must encompass or match the 2V ~ 6V requirement
Operating temperature range may extend beyond the original specification
Mounting type must be Surface Mount
Package format may vary between SSOP and TSSOP variants within the same pitch family
All parts must belong to the 74HC240 base product family
RoHS3 compliance is required

The three substitute parts listed below meet all mandatory substitution criteria while offering variations in manufacturer, package geometry, and temperature rating.

Parameter Comparison

Parameter	SN74HC240DBR (Main)	74HC240PW,118	MC74HC240ADTR2G	MM74HC240MTCX
Manufacturer	Texas Instruments	Nexperia USA Inc.	onsemi	Fairchild Semiconductor
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature (TA)	-40°C ~ 85°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts maintain active product status and meet the core functional requirements of the SN74HC240DBR. Selection between alternatives depends on specific application constraints:

The 74HC240PW,118 (Nexperia) and MC74HC240ADTR2G (onsemi) both utilize the 20-TSSOP package format, which features a narrower body width (0.173" versus 0.209") compared to the original SSOP package. This package transition is electrically equivalent but requires PCB layout verification for pin-to-pin compatibility. The Nexperia part supports operating temperatures to 125°C, while the onsemi variant extends the lower temperature limit to -55°C, providing the widest temperature envelope.

The MM74HC240MTCX (Fairchild Semiconductor) maintains the same operating temperature range as the original part (-40°C ~ 85°C) and uses the 20-TSSOP package format. RoHS and moisture sensitivity specifications are not provided for this part.

All parts carry RoHS3 compliance where specified and maintain unlimited moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the 74HC240PW,118 directly replace the SN74HC240DBR on an existing PCB?

A: Electrical substitution is valid. However, the package format differs: 74HC240PW,118 uses 20-TSSOP (0.173" width) while SN74HC240DBR uses 20-SSOP (0.209" width). PCB footprint compatibility must be verified before implementation. Pin pitch and lead configuration remain compatible within the SSOP/TSSOP family.

Q: What is the advantage of the MC74HC240ADTR2G over the original part?

A: The MC74HC240ADTR2G extends the operating temperature range to -55°C ~ 125°C, providing enhanced performance in extreme temperature environments. All other electrical parameters remain equivalent.

Q: Are all substitute parts RoHS3 compliant?

A: The 74HC240PW,118 and MC74HC240ADTR2G are explicitly RoHS3 compliant. The MM74HC240MTCX does not specify RoHS status in the provided data.

Q: Does package format affect circuit performance?

A: Package format (SSOP versus TSSOP) does not affect electrical performance. Both formats maintain identical pin pitch, electrical characteristics, and functional behavior. Selection is based on PCB layout requirements and available footprint space.

Q: Can these parts be used interchangeably in high-temperature applications?

A: The MC74HC240ADTR2G supports operation to 125°C and is suitable for extended temperature applications. The SN74HC240DBR and MM74HC240MTCX are rated to 85°C maximum. The 74HC240PW,118 supports 125°C operation. Application temperature requirements must be matched to part specifications.

Q: What inventory considerations apply to these substitutes?

A: Current inventory levels vary: SN74HC240DBR (4865 pcs), 74HC240PW,118 (1009 pcs), MC74HC240ADTR2G (1598 pcs), MM74HC240MTCX (3700 pcs). Availability should be confirmed with the supplier for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message