664A2002ALF Equivalent & Substitute Parts Reference

Part Overview

The 664A2002ALF is a 4-resistor isolated network array manufactured by TT Electronics/BI, featuring 20kΩ ±0.1% tolerance resistors in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The Vishay Dale Thin Film ORN series provides direct functional equivalents across multiple tolerance grades, all in active production status.

Substiute Parts

664A2002ALF

TT Electronics/BIIn Stock: 741664A2002ALF Datasheet

Current PartRFQ

ORNA2002AT1

Vishay Dale Thin FilmIn Stock: 1122ORNA2002AT1 Datasheet

DirectRFQ

ORNTA2002AT1

Vishay Dale Thin FilmIn Stock: 1016ORNTA2002AT1 Datasheet

DirectRFQ

ORNTA2002BT1

Vishay Dale Thin FilmIn Stock: 784ORNTA2002BT1 Datasheet

DirectRFQ

ORNTA2002CT1

Vishay Dale Thin FilmIn Stock: 740ORNTA2002CT1 Datasheet

DirectRFQ

ORNTA2002DT1

Vishay Dale Thin FilmIn Stock: 993ORNTA2002DT1 Datasheet

DirectRFQ

ORNTA2002FT1

Vishay Dale Thin FilmIn Stock: 765ORNTA2002FT1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 664A2002ALF is determined by the following critical parameters:

• Resistance value: 20kΩ (exact match required)
• Circuit type: Isolated (exact match required)
• Number of resistors: 4 (exact match required)
• Power per element: 100mW (exact match required)
• Temperature coefficient: ±25ppm/°C (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)
• Package: 8-SOIC (exact match required)
• Mounting type: Surface Mount (exact match required)
• Moisture sensitivity level: MSL 1 (exact match required)

The Vishay Dale Thin Film ORN series substitutes are grouped by tolerance specification, which represents the primary variable parameter. All substitute parts maintain identical electrical performance across the core parameters listed above. Tolerance grades range from ±0.1% (ORNTA2002AT1) to ±1% (ORNTA2002FT1), with corresponding variations in resistor matching ratio specifications.

Parameter Comparison

Engineering Selection Recommendations

All Vishay Dale Thin Film ORN series substitutes are in active production status, providing long-term availability compared to the obsolete 664A2002ALF. Selection among the substitute options depends on tolerance and compliance requirements:

ORNTA2002AT1 provides the closest electrical match with ±0.1% tolerance and ±0.05% resistor matching ratio, identical to the original part. This variant is ROHS3 compliant and recommended for applications requiring the highest precision specifications.

ORNA2002AT1 offers ±0.1% tolerance with ±0.05% matching ratio but is RoHS non-compliant. This variant is suitable only for applications without RoHS compliance requirements.

ORNTA2002BT1 maintains ±0.1% tolerance but increases resistor matching ratio to ±0.1%. ROHS3 compliance is provided. This variant is suitable for applications where slightly relaxed matching specifications are acceptable.

ORNTA2002CT1, ORNTA2002DT1, and ORNTA2002FT1 offer progressively relaxed tolerance grades (±0.25%, ±0.5%, and ±1% respectively) with corresponding increases in resistor matching ratio. All are ROHS3 compliant. These variants are suitable for applications with less stringent tolerance requirements.

Frequently Asked Questions (FAQ)

Q: Can ORNTA2002BT1 be used as a direct replacement for 664A2002ALF?

A: ORNTA2002BT1 is electrically compatible in terms of resistance value, circuit configuration, power rating, temperature range, and package. However, the resistor matching ratio is ±0.1% compared to the original ±0.05%. Selection depends on whether the application circuit design tolerates this relaxed matching specification.

Q: What is the difference between ORNA2002AT1 and ORNTA2002AT1?

A: Both parts have identical electrical specifications (20kΩ ±0.1%, ±0.05% matching ratio). The primary difference is RoHS compliance status: ORNA2002AT1 is RoHS non-compliant, while ORNTA2002AT1 is ROHS3 compliant. For new designs and applications subject to RoHS regulations, ORNTA2002AT1 is the appropriate selection.

Q: Are the physical dimensions of substitute parts compatible with the original PCB layout?

A: Substitute parts have slightly larger dimensions (0.194" L × 0.157" W versus 0.193" L × 0.154" W for the original). Height is marginally reduced (0.068" versus 0.069"). These dimensional variations are within typical PCB design tolerances for 8-SOIC packages. Verify footprint compatibility with your specific PCB design before production.

Q: Which substitute part should be selected for maximum precision?

A: ORNTA2002AT1 provides the highest precision with ±0.1% tolerance and ±0.05% resistor matching ratio, matching the original 664A2002ALF specifications. This variant is ROHS3 compliant and in active production.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes, all Vishay Dale Thin Film ORN series substitutes are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: What is the impact of tolerance grade selection on circuit performance?

A: Tolerance grade affects the initial accuracy of individual resistor values. Resistor matching ratio affects the relative accuracy between resistors within the array. For precision analog circuits, ORNTA2002AT1 (±0.1% tolerance, ±0.05% matching) is recommended. For general-purpose applications, ORNTA2002FT1 (±1% tolerance, ±0.5% matching) is acceptable if circuit design margins accommodate these specifications.