SN74HCT245DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74HCT245DBRG4 is a non-inverting bus transceiver manufactured by Texas Instruments, designed for 8-bit data transfer with 3-state output capability. This component operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP package. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain functional and electrical compatibility for ongoing system support and new designs.

Substiute Parts

SN74HCT245DBRG4

Texas InstrumentsIn Stock: 845SN74HCT245DBRG4 Datasheet

Current PartRFQ

SN74HCT245DBR

Texas InstrumentsIn Stock: 3324SN74HCT245DBR Datasheet

Parametric EquivalentRFQ

74HCT245PW,118

Nexperia USA Inc.In Stock: 2505774HCT245PW,118 Datasheet

MFR RecommendedRFQ

M74HCT245TTR

STMicroelectronicsIn Stock: 1694M74HCT245TTR Datasheet

MFR RecommendedRFQ

MM74HCT245MTCX

Fairchild SemiconductorIn Stock: 4557MM74HCT245MTCX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HCT245DBRG4 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
• Voltage - Supply: 4.5V ~ 5.5V
• Current - Output High, Low: 6mA, 6mA (or higher)
• Base Product Number: 74HCT245
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical logic functionality, bit configuration, and electrical specifications. Package variations (SSOP vs. TSSOP) are permissible provided PCB layout accommodates the physical dimensions. Operating temperature range extensions are acceptable for applications requiring wider thermal performance.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74HCT245DBR

The SN74HCT245DBR is the direct parametric equivalent to the SN74HCT245DBRG4. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and are housed in the same 20-SSOP package. The SN74HCT245DBR maintains active product status with 3300 units in stock, ensuring supply continuity. This part is ROHS3 compliant and carries MSL 1 rating, matching the original component's environmental specifications.

Secondary Recommendation: 74HCT245PW,118

The 74HCT245PW,118 manufactured by Nexperia USA Inc. provides functional equivalence with extended operating temperature range (-40°C to 125°C). The package transitions from 20-SSOP to 20-TSSOP, requiring PCB layout verification due to reduced package width (4.40mm vs. 5.30mm). This part maintains 25003 units in inventory and active product status. ROHS3 compliance is confirmed.

Tertiary Recommendation: MM74HCT245MTCX

The MM74HCT245MTCX from Fairchild Semiconductor offers functional compatibility with marginally elevated output current specifications (7.2mA vs. 6mA). The 20-TSSOP package requires PCB layout accommodation. This part is active with 4546 units available. Operating temperature range matches the original (-40°C to 85°C).

Not Recommended: M74HCT245TTR

The M74HCT245TTR from STMicroelectronics carries obsolete product status and MSL 3 rating (168 hours), indicating higher moisture sensitivity compared to the original MSL 1 specification. While electrical parameters are compatible, the obsolete status and stricter moisture handling requirements make this option unsuitable for new designs or long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use 74HCT245PW,118 as a direct replacement for SN74HCT245DBRG4?

A: Yes, functionally. The 74HCT245PW,118 maintains all critical electrical parameters and logic functionality. However, the package changes from 20-SSOP to 20-TSSOP with reduced width (4.40mm vs. 5.30mm). PCB layout verification is required to confirm pad spacing and component placement compatibility.

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

A: Both are 20-pin surface mount packages with identical pin pitch. TSSOP (Thin Shrink Small Outline Package) has a narrower body width (4.40mm) compared to SSOP (Small Outline Package) at 5.30mm. Electrical performance is identical; physical layout accommodation is the only consideration.

Q: Why is the M74HCT245TTR not recommended despite electrical compatibility?

A: The M74HCT245TTR carries obsolete product status and MSL 3 moisture sensitivity rating. MSL 3 requires controlled storage conditions (168-hour shelf life limit after moisture exposure), whereas the original SN74HCT245DBRG4 has MSL 1 (unlimited shelf life). For production environments and long-term inventory management, active parts with MSL 1 are preferred.

Q: Are there output current differences between substitute parts?

A: The MM74HCT245MTCX specifies 7.2mA output current versus 6mA for other parts. This represents a 20% increase in drive capability. For applications operating at maximum specified current limits, this provides additional margin. For standard applications, the difference is not functionally significant.

Q: Which substitute part has the best inventory availability?

A: The 74HCT245PW,118 from Nexperia USA Inc. has the highest inventory level at 25003 units, followed by MM74HCT245MTCX at 4546 units and SN74HCT245DBR at 3300 units. Inventory levels should be verified with current supplier data before procurement decisions.

Q: Do all substitute parts meet RoHS3 compliance?

A: SN74HCT245DBR, 74HCT245PW,118, and M74HCT245TTR are confirmed ROHS3 compliant. MM74HCT245MTCX does not specify RoHS status in the provided data. Compliance verification with the supplier is recommended if RoHS certification is a design requirement.