LTV-844S-TA Equivalent & Substitute Parts

Part Overview

The LTV-844S-TA is a quad-channel optoisolator with transistor output manufactured by LITEON. This component provides 5000Vrms isolation across four independent channels in a 16-SMD surface mount package. The device is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Substiute Parts

LTV-844S-TA

LITEONIn Stock: 1210LTV-844S-TA Datasheet

Current PartRFQ

ISP844SMT&R

Isocom Components 2004 LTDIn Stock: 1152ISP844SMT&R Datasheet

Parametric EquivalentRFQ

ISP844XSMT&R

Isocom Components 2004 LTDIn Stock: 1073ISP844XSMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTV-844S-TA are qualified based on the following criteria:

Electrical Compatibility:

• Four-channel configuration
• Isolation voltage ≥ 5000Vrms
• Current transfer ratio range: 20% to 300% @ 1mA
• Rise/Fall time: 4µs, 3µs
• Transistor output with maximum output voltage of 35V
• Output current per channel: 50mA
• Vce saturation: 200mV maximum
• AC and DC input capability
• Operating temperature range: -30°C ~ 100°C

Mechanical Compatibility:

• 16-SMD surface mount package with Gull Wing leads
• Moisture sensitivity level 1 (unlimited shelf life)

Both ISP844SMT&R and ISP844XSMT&R from Isocom Components 2004 LTD meet these criteria with enhanced isolation voltage (5300Vrms) and active product status.

Parameter Comparison

Engineering Selection Recommendations

Both ISP844SMT&R and ISP844XSMT&R are direct functional equivalents to the LTV-844S-TA. Selection between these two Isocom alternatives should be based on:

Product Status: Both substitute parts carry active product status, ensuring long-term availability and manufacturing support compared to the obsolete LTV-844S-TA.

Compliance: Both ISP844 variants are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in most markets.

Electrical Performance: The substitute parts provide enhanced isolation voltage (5300Vrms versus 5000Vrms), offering improved safety margins in high-voltage isolation applications while maintaining all other electrical specifications.

Packaging and Handling: Both alternatives maintain identical 16-SMD Gull Wing packaging and MSL 1 moisture sensitivity rating, requiring no changes to assembly processes or storage procedures.

Frequently Asked Questions (FAQ)

Q: Can ISP844SMT&R and ISP844XSMT&R be used interchangeably with LTV-844S-TA?

A: Yes. Both parts meet all electrical and mechanical specifications required for LTV-844S-TA substitution. The primary difference between ISP844SMT&R and ISP844XSMT&R is internal device variant; both are functionally equivalent for this application.

Q: What is the significance of the higher isolation voltage in the substitute parts?

A: The ISP844 variants provide 5300Vrms isolation compared to the LTV-844S-TA's 5000Vrms. This represents a 6% improvement in isolation capability and provides additional safety margin in high-voltage isolation circuits. Applications designed for 5000Vrms isolation will operate within specification with the higher-rated substitutes.

Q: Are there any package or pinout differences?

A: No. Both ISP844SMT&R and ISP844XSMT&R use identical 16-SMD Gull Wing packaging with the same pinout as the LTV-844S-TA. No PCB layout modifications are required.

Q: What compliance certifications apply to the substitute parts?

A: Both ISP844 variants are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: How do the current transfer ratios compare?

A: All three parts maintain identical current transfer ratio specifications: 20% minimum and 300% maximum at 1mA input current. No performance difference exists in this parameter.

Q: Are there any temperature range limitations?

A: No. All three parts operate across the same temperature range of -30°C to 100°C. No thermal performance differences exist.