SN74LS623NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS623NG4 is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, designed for 8-bit data bus applications with 3-state output capability. This device operates within a 4.75V to 5.25V supply voltage range and is housed in a 20-pin DIP package suitable for through-hole mounting.

The SN74LS623NG4 has been discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and legacy system support.

Substiute Parts

SN74LS623NG4

Texas InstrumentsIn Stock: 936SN74LS623NG4 Datasheet

Current PartRFQ

SN74LS245N

Texas InstrumentsIn Stock: 5252SN74LS245N Datasheet

Parametric EquivalentRFQ

SN74LS645N

Texas InstrumentsIn Stock: 15261SN74LS645N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS623NG4 are identified based on strict parametric equivalence across the following criteria:

• Logic type classification: Transceiver, Non-Inverting
• Functional configuration: 1 Element, 8 Bits per Element
• Output architecture: 3-State output
• Electrical performance: Output current ratings (15mA high, 24mA low)
• Supply voltage range: 4.75V ~ 5.25V
• Operating temperature range: 0°C ~ 70°C
• Physical form factor: 20-pin DIP package with 0.300" (7.62mm) pitch
• Mounting technology: Through-hole compatible
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The substitute parts listed below meet all these parameters and are therefore electrically and mechanically interchangeable with the SN74LS623NG4 in applications requiring non-inverting 8-bit transceiver functionality with 3-state output control.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS623NG4 is discontinued and no longer available through primary distribution channels. Both substitute parts—SN74LS245N and SN74LS645N—are active products currently in production and available in stock quantities.

Selection between the two substitutes should be based on:

• Packaging format: SN74LS245N and SN74LS645N are supplied in tube packaging, whereas the original SN74LS623NG4 packaging format is not specified in the available data.
• Inventory availability: SN74LS645N has higher stock levels (15,245 units) compared to SN74LS245N (5,200 units), providing greater supply security for high-volume applications.
• Regulatory compliance: Both substitutes maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Either substitute part is electrically and mechanically equivalent and suitable for direct replacement in applications currently using the SN74LS623NG4.

Frequently Asked Questions (FAQ)

Q: Are SN74LS245N and SN74LS645N pin-for-pin compatible with SN74LS623NG4?

A: Yes. All three parts share identical 20-pin DIP package geometry with 0.300" (7.62mm) pitch and are through-hole mounted. Pin assignments for the transceiver function are equivalent across all three part numbers.

Q: Can I use either substitute interchangeably, or is one preferred over the other?

A: Both substitutes meet all electrical and mechanical parameters required for direct replacement. Selection may be influenced by packaging preference, inventory availability, or lead time considerations. SN74LS645N currently has higher stock availability.

Q: What electrical parameters must remain constant when substituting these parts?

A: The following parameters are identical across all three parts and must be maintained: 8-bit non-inverting transceiver function, 3-state output architecture, 15mA output high current, 24mA output low current, 4.75V to 5.25V supply voltage range, and 0°C to 70°C operating temperature range.

Q: Are there any compliance or certification differences between the original and substitute parts?

A: No. All three parts are ROHS3 compliant and REACH unaffected. Regulatory status is equivalent.

Q: What is the primary reason for substitution?

A: The SN74LS623NG4 has been discontinued at DiGi Electronics. SN74LS245N and SN74LS645N are active products with current manufacturing and distribution support.