SN74HC245DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74HC245DBRG4 is a non-inverting bus transceiver logic IC manufactured by Texas Instruments, designed for 8-bit data transfer with 3-state output capability. Operating across a 2V to 6V supply range, this component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Base Product Number	74HC245
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC245DBRG4 is determined by the following critical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 7.8mA, 7.8mA
Voltage - Supply: 2V ~ 6V
Mounting Type: Surface Mount
Base Product Number: 74HC245 series

Substitute parts must maintain identical electrical specifications and functional characteristics. Package variations (20-SSOP versus 20-TSSOP) are permissible when mechanical constraints allow, as both are surface-mount packages with compatible pinouts for the 74HC245 logic family.

Parameter Comparison

Parameter	SN74HC245DBRG4	SN74HC245DBR	74HC245PW,112	74HC245PW,118	MM74HC245AMTCX
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	Fairchild Semiconductor
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8
Output Type	3-State	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	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP	20-SSOP	20-TSSOP	20-TSSOP	20-TSSOP
Product Status	Discontinued	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitute: SN74HC245DBR

The SN74HC245DBR from Texas Instruments is the direct parametric equivalent with identical electrical specifications and 20-SSOP packaging. This part maintains active product status, ensuring long-term availability and supply chain stability. RoHS3 compliance is maintained.

Secondary Substitutes: 74HC245PW,112 and 74HC245PW,118

Both Nexperia USA Inc. variants (74HC245PW,112 and 74HC245PW,118) provide electrical equivalence with extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). The 74HC245PW,118 is recommended over 74HC245PW,112 due to active product status. Package transition from 20-SSOP to 20-TSSOP requires PCB layout verification for mechanical compatibility.

Tertiary Substitute: MM74HC245AMTCX

The MM74HC245AMTCX from Fairchild Semiconductor maintains full electrical equivalence with active product status. This option is suitable when supply constraints on primary alternatives exist. Package compatibility with 20-TSSOP must be confirmed for existing designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HC245DBRG4 with SN74HC245DBR?

A: Yes. Both parts share identical electrical specifications, output current ratings, supply voltage range, and operating temperature limits. The primary difference is packaging format (Cut Tape & Digi-Reel versus the original specification), which does not affect functional performance.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both are 20-pin surface-mount packages with compatible pinouts for the 74HC245 logic family. The 20-SSOP has a 0.209" width (5.30mm), while the 20-TSSOP has a 0.173" width (4.40mm). PCB footprint and land pattern must be verified before substitution to ensure mechanical fit.

Q: Why do some substitutes have an extended operating temperature range?

A: The Nexperia variants (74HC245PW,112 and 74HC245PW,118) are rated to -40°C ~ 125°C, compared to the original -40°C ~ 85°C specification. This extended range does not affect compatibility; designs operating within the original temperature limits remain fully functional.

Q: Is the MM74HC245AMTCX from Fairchild Semiconductor a suitable long-term alternative?

A: Yes. The MM74HC245AMTCX maintains active product status and full electrical equivalence. It is suitable for applications where primary alternatives face supply constraints. Verify RoHS compliance requirements with your procurement department, as this specification was not provided in the component data.

Q: What should I verify before implementing a package change from 20-SSOP to 20-TSSOP?

A: Confirm PCB footprint compatibility, land pattern dimensions, and solder reflow profile suitability. Both packages are surface-mount with identical pinout assignments for the 74HC245 base product number, but physical dimensions differ. Consult the respective manufacturer datasheets for detailed package drawings.

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