SN74LS19ANS Equivalent & Substitute Parts

Part Overview

The SN74LS19ANS is a 6-channel inverter IC with Schmitt trigger inputs manufactured by Texas Instruments in the 74LS logic series. This device features 6 independent inverter circuits with Schmitt trigger input characteristics, housed in a 14-SO surface mount package. The part is currently in Last Time Buy status, indicating discontinued production with limited remaining inventory. Identification of equivalent and substitute parts is necessary to ensure design continuity and long-term component availability for new production runs and system maintenance.

Substiute Parts

SN74LS19ANS

Texas InstrumentsIn Stock: 1163SN74LS19ANS Datasheet

Current PartRFQ

SN74LS19ANSR

Texas InstrumentsIn Stock: 3210SN74LS19ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS19ANS is determined by the following critical parameters:

Mandatory Matching Parameters:

• Logic Type: Inverter
• Number of Circuits: 6
• Features: Schmitt Trigger
• Voltage - Supply: 4.75V ~ 5.25V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.209", 5.30mm Width)
• Operating Temperature: 0°C ~ 70°C
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Number of Inputs: May vary based on circuit configuration
• Input Logic Level thresholds: May vary within Schmitt trigger specifications
• Current specifications: May vary within acceptable operating ranges
• Product Status: Active status preferred for long-term availability

The SN74LS19ANSR qualifies as a manufacturer-recommended substitute based on matching all mandatory parameters while maintaining functional equivalence within the 74LS logic family.

Parameter Comparison

Engineering Selection Recommendations

SN74LS19ANSR Selection Criteria:

The SN74LS19ANSR is the manufacturer-recommended substitute for the SN74LS19ANS. This substitution is supported by the following factors:

1. Product Status: The SN74LS19ANSR maintains Active product status, ensuring continued availability and long-term supply chain stability, whereas the SN74LS19ANS is designated Last Time Buy with limited inventory.

2. Compliance Alignment: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 1 - Unlimited), ensuring equivalent environmental and regulatory compatibility.

3. Functional Equivalence: Both devices share identical supply voltage ranges (4.75V ~ 5.25V), propagation delay specifications (30ns @ 5V, 15pF), output current characteristics (400µA, 8mA), and operating temperature ranges (0°C ~ 70°C).

4. Package Compatibility: Both parts utilize the identical 14-SOIC surface mount package (0.209", 5.30mm Width), enabling direct PCB layout compatibility without redesign.

5. Logic Family Consistency: Both parts belong to the Texas Instruments 74LS logic series with Schmitt trigger inverter functionality.

The primary design consideration is the difference in Number of Inputs (6 inputs in SN74LS19ANS versus 1 input in SN74LS19ANSR). Circuit designers must verify that the input configuration of the SN74LS19ANSR aligns with the specific application requirements before implementation.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS19ANSR directly replace the SN74LS19ANS in existing designs?

A: The SN74LS19ANSR is functionally equivalent in terms of logic operation, supply voltage, propagation delay, and package form factor. However, the difference in Number of Inputs (1 input versus 6 inputs) requires verification that the substitute part's input configuration matches the circuit application. PCB layout compatibility is maintained due to identical 14-SOIC packaging.

Q: What is the significance of the Last Time Buy status for the SN74LS19ANS?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part. Existing inventory is limited to 1058 pieces. For new production runs or long-term system support, transition to the SN74LS19ANSR (Active status, 3200 pieces in stock) is recommended to ensure supply chain continuity.

Q: Are the electrical specifications identical between these two parts?

A: The supply voltage range (4.75V ~ 5.25V), output current specifications (400µA, 8mA), propagation delay (30ns @ 5V, 15pF), and operating temperature range (0°C ~ 70°C) are identical. The Input Logic Level - Low differs (1.25V versus 0.75V), reflecting the different input configurations. Both maintain Schmitt trigger functionality.

Q: Does the package change require PCB redesign?

A: No. Both the SN74LS19ANS and SN74LS19ANSR use the identical 14-SOIC (0.209", 5.30mm Width) surface mount package. Direct PCB layout compatibility is maintained without redesign.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are classified under ECCN EAR99 and HTSUS 8542.39.0001 for regulatory and trade purposes.

Q: How does the input configuration difference affect circuit design?

A: The SN74LS19ANS provides 6 independent input channels, while the SN74LS19ANSR provides 1 input channel. Circuit designers must confirm that the application requires only single-input inverter functionality before selecting the SN74LS19ANSR as a substitute.