SN74HC645ANS Equivalent & Substitute Parts

Part Overview

The SN74HC645ANS is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This device functions as a 1-element, 8-bit transceiver with 3-state output capability, designed for bidirectional data transmission in digital systems. The part is currently in active product status with 1074 units available in new original inventory. The SN74HC645ANS operates across a supply voltage range of 2V to 6V and maintains performance across the industrial temperature range of -40°C to 85°C. Identifying equivalent substitute parts becomes necessary when managing component availability, optimizing supply chain logistics, or addressing inventory constraints while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

SN74HC645ANS

Texas InstrumentsIn Stock: 1133SN74HC645ANS Datasheet

Current PartRFQ

SN74HC245NS

Texas InstrumentsIn Stock: 3365SN74HC245NS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74HC645ANS are determined by strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key parameters that must remain identical:

Electrical Parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 7.8 mA, 7.8 mA
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 85°C (TA)

Mechanical Parameters:

• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (0.209", 5.30mm Width)
• Supplier Device Package: 20-SO

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The SN74HC245NS qualifies as a parametric equivalent substitute because it maintains identical specifications across all electrical and mechanical parameters listed above. Both parts belong to the Texas Instruments 74HC series and share the same functional architecture, pin configuration, and performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SN74HC645ANS (Primary Selection)

The SN74HC645ANS is the recommended primary selection for new designs and ongoing production. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. Current inventory of 1074 units supports immediate procurement requirements. The device carries ROHS3 compliance certification and MSL Level 1 rating, meeting environmental and moisture sensitivity requirements for standard manufacturing processes.

SN74HC245NS (Substitute Selection)

The SN74HC245NS functions as a parametric equivalent substitute with identical electrical and mechanical specifications. However, this part is discontinued at DiGi Electronics, indicating reduced market availability. Selection of this substitute should be limited to applications where existing inventory exists or where supply chain alternatives have been exhausted. The part maintains ROHS3 compliance and MSL Level 1 rating, preserving compliance requirements equivalent to the primary part.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC245NS be used as a direct replacement for the SN74HC645ANS?

A: Yes. The SN74HC245NS qualifies as a parametric equivalent substitute. Both parts share identical logic type (Transceiver, Non-Inverting), element configuration (1 element, 8 bits per element), output type (3-State), current ratings (7.8 mA output high and low), supply voltage range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), package type (20-SOIC), and compliance certifications (ROHS3, MSL Level 1). Pin-to-pin compatibility and functional performance are equivalent.

Q: What is the difference between these two parts?

A: The primary difference is product status. The SN74HC645ANS maintains active status with current manufacturing and distribution support. The SN74HC245NS is discontinued at DiGi Electronics, indicating reduced availability. All electrical and mechanical parameters are identical.

Q: Are there any packaging differences between these parts?

A: No. Both parts use identical 20-SOIC surface mount packaging with 0.209" width (5.30mm). The supplier device package designation is 20-SO for both parts. PCB footprints and assembly processes are identical.

Q: What compliance certifications apply to both parts?

A: Both the SN74HC645ANS and SN74HC245NS carry ROHS3 compliance certification and Moisture Sensitivity Level (MSL) rating of 1 (Unlimited). These certifications are equivalent across both parts.

Q: Which part should be selected for new designs?

A: The SN74HC645ANS should be selected for new designs due to active product status and confirmed availability. This ensures design continuity and long-term supply chain support.

Q: Can the SN74HC245NS be used if the SN74HC645ANS becomes unavailable?

A: The SN74HC245NS can serve as a substitute if existing inventory is available. However, given its discontinued status at DiGi Electronics, availability may be limited. Verification of inventory from alternative distributors is necessary before committing to this substitute.