6943R1KALF Equivalent & Substitute Parts

Part Overview

The 6943R1KALF is a 4-resistor network array manufactured by TT Electronics/BI, featuring 1kΩ isolated resistors with ±0.1% tolerance and 100mW power per element in an 8-DIP through-hole package. This component is classified as obsolete, making identification of compatible substitutes essential for ongoing production and maintenance applications. The high precision tolerance and low temperature coefficient make this part suitable for applications requiring stable resistor networks with minimal drift characteristics.

Substiute Parts

6943R1KALF

TT Electronics/BIIn Stock: 11296943R1KALF Datasheet

Current PartRFQ

4108R-1-102LF

Bourns Inc.In Stock: 11444108R-1-102LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 6943R1KALF is determined by the following critical parameters:

• Resistance Value: Must be 1kΩ
• Circuit Configuration: Must be isolated 4-resistor network
• Package Type: Must be 8-DIP (0.300", 7.62mm) for through-hole mounting compatibility
• Operating Temperature Range: Must support -55°C to 125°C minimum
• Number of Pins: Must be 8-pin configuration

The 4108R-1-102LF from Bourns Inc. meets these core substitution criteria. While this substitute exhibits relaxed tolerance (±2% versus ±0.1%) and higher temperature coefficient (±100ppm/°C versus ±25ppm/°C), it maintains identical resistance value, circuit isolation, package footprint, and operating temperature range. The increased power rating (250mW per element versus 100mW) provides additional thermal margin.

Parameter Comparison

Engineering Selection Recommendations

The 4108R-1-102LF serves as a functional substitute for the obsolete 6943R1KALF based on matching package geometry, pin count, resistance value, and operating temperature range. The substitute is currently in active production status with ROHS3 compliance and REACH affected designation, ensuring long-term availability and regulatory alignment.

Selection of the 4108R-1-102LF requires evaluation of application-specific tolerance and temperature drift requirements. Applications demanding the original ±0.1% tolerance and ±25ppm/°C temperature coefficient may require circuit-level compensation or alternative component selection strategies. The increased power dissipation capability (250mW versus 100mW per element) of the substitute provides thermal design flexibility without package footprint changes.

Frequently Asked Questions (FAQ)

Q: Can the 4108R-1-102LF directly replace the 6943R1KALF in existing PCB designs?

A: Yes, direct PCB replacement is possible due to identical 8-DIP package dimensions and pin configuration. No board layout modifications are required.

Q: What are the tolerance implications of substitution?

A: The substitute exhibits ±2% tolerance compared to the original ±0.1%. Applications with tight tolerance requirements must evaluate whether this 20-fold increase in tolerance variation is acceptable for circuit performance.

Q: How does the temperature coefficient difference affect circuit operation?

A: The substitute's ±100ppm/°C temperature coefficient is four times higher than the original ±25ppm/°C specification. Over the full -55°C to 125°C operating range (180°C span), this results in maximum resistance drift of ±1.8% for the substitute versus ±0.45% for the original component.

Q: Are there compliance or regulatory differences between these parts?

A: The 4108R-1-102LF is ROHS3 compliant and REACH affected, while the 6943R1KALF is REACH unaffected. Both carry EAR99 ECCN classification. Applications subject to REACH regulations should verify the substitute's compliance status with supply chain requirements.

Q: What is the significance of the increased power rating?

A: The 4108R-1-102LF provides 250mW per element versus 100mW for the original. This higher rating allows greater current handling capability without thermal derating, beneficial for applications approaching the original component's power limits.