SN74LS595N-NG Equivalent & Substitute Parts

Part Overview

The SN74LS595N-NG is an 8-bit shift register with serial-to-parallel and serial output functionality, manufactured by Texas Instruments in the 74LS logic series. This component features tri-state output configuration and operates within a 4.75V to 5.25V supply voltage range. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain functional compatibility while accommodating differences in packaging, voltage specifications, and operating temperature ranges.

Substiute Parts

SN74LS595N-NG

Texas InstrumentsIn Stock: 930SN74LS595N-NG Datasheet

Current PartRFQ

SN74LV595ABQBR

Texas InstrumentsIn Stock: 3368SN74LV595ABQBR Datasheet

MFR RecommendedRFQ

SN74LS595N

Texas InstrumentsIn Stock: 6371SN74LS595N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS595N-NG is determined by the following critical parameters:

Functional Equivalence: All substitute parts must implement 8-bit shift register functionality with serial-to-parallel and serial output capability.

Logic Family Compatibility: The 74LS series operates at 4.75V to 5.25V. The 74LV series operates at 2V to 5.5V, providing backward compatibility with 5V systems while extending lower voltage operation.

Output Configuration: The original part features tri-state outputs. Substitute SN74LV595ABQBR provides complementary push-pull outputs, which is functionally compatible for parallel data transfer applications. Substitute SN74LS595N maintains identical tri-state output configuration.

Packaging and Mounting: Through-hole 16-PDIP packaging is the primary form factor. Surface-mount alternatives (16-WFQFN) require board redesign and are suitable only when form factor change is acceptable.

Operating Temperature Range: The original part operates 0°C to 70°C. Extended-range substitutes (−40°C to 125°C) provide broader environmental capability.

Compliance: All listed substitutes maintain ROHS3 compliance and EAR99 ECCN classification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Through-Hole, 5V Systems): Select SN74LS595N. This part maintains identical electrical specifications, package form factor, and tri-state output configuration as the obsolete SN74LS595N-NG. Both operate at 4.75V to 5.25V with 0°C to 70°C temperature range. The SN74LS595N is active and ROHS3 compliant, providing continuity for existing through-hole PCB designs without modification.

For Extended Operating Range (Through-Hole, Broader Temperature/Voltage): The SN74LV595ABQBR is not suitable for through-hole replacement due to surface-mount packaging. If extended temperature range (−40°C to 125°C) or lower voltage operation (2V minimum) is required with through-hole mounting, alternative 74LS or 74LV through-hole packages must be evaluated.

For New Designs (Surface-Mount, Extended Range): Select SN74LV595ABQBR for applications requiring surface-mount technology, extended operating temperature (−40°C to 125°C), and wider supply voltage range (2V to 5.5V). This part features complementary push-pull outputs instead of tri-state; verify output configuration compatibility with circuit design. The SN74LV595ABQBR is active and ROHS3 compliant with MSL 1 rating.

Compliance Verification: All three parts maintain ROHS3 compliance and EAR99 ECCN classification, suitable for standard commercial and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS595N directly replace SN74LS595N-NG without PCB modification?

A: Yes. Both parts share identical electrical specifications (4.75V to 5.25V supply, 0°C to 70°C operating range), tri-state output configuration, and 16-PDIP through-hole package. No PCB redesign is required. The SN74LS595N is the active production equivalent of the obsolete SN74LS595N-NG.

Q: What is the difference between tri-state and complementary push-pull outputs?

A: Tri-state outputs (SN74LS595N) provide three states: high, low, and high-impedance (disabled). Complementary push-pull outputs (SN74LV595ABQBR) provide only high and low states without high-impedance capability. Tri-state outputs are required for bus-sharing applications; push-pull outputs are suitable for dedicated parallel data transfer.

Q: Is SN74LV595ABQBR compatible with 5V systems?

A: Yes. The SN74LV595ABQBR operates across 2V to 5.5V supply range, which includes standard 5V systems (4.75V to 5.25V). However, it is a surface-mount component in 16-WFQFN package, requiring PCB redesign from the through-hole 16-PDIP form factor.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All three parts listed are ROHS3 compliant.

Q: Can I use SN74LV595ABQBR in a through-hole socket?

A: No. The SN74LV595ABQBR is a surface-mount component in 16-WFQFN package (2.5mm × 3.5mm). It cannot be inserted into through-hole sockets. PCB redesign with surface-mount pads is required.

Q: What is the operating temperature difference between the parts?

A: SN74LS595N-NG and SN74LS595N operate 0°C to 70°C. SN74LV595ABQBR operates −40°C to 125°C, providing extended low-temperature and high-temperature capability. Select extended-range parts for industrial or automotive applications requiring broader temperature operation.

Q: Are all three parts in stock?

A: Inventory status is provided for reference: SN74LS595N-NG (820 Pcs), SN74LS595N (6342 Pcs), SN74LV595ABQBR (3324 Pcs). Verify current availability with supplier before procurement.