Equivalent & Substitute Parts: VCC 159 Incandescent Lamp RT-3.25 Wedge 6.3V

Part Overview

The VCC 159 is an incandescent lamp featuring a clear round domed top lens in RT-3 1/4 size with wedge lead configuration, rated for 6.3V operation. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing maintenance, repair, and system support applications. The lamp produces 0.34 MSCP (Mean Spherical Candle Power) and is designed for indicator and illumination applications requiring low-voltage incandescent technology.

Substiute Parts

159

Visual Communications Company - VCCIn Stock: 905159 Datasheet

Current PartRFQ

259

CEC IndustriesIn Stock: 1214259 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VCC 159 is based on strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Voltage Rating: 6.3V (electrical compatibility)
• Lead Style: Wedge (mechanical and electrical connection)
• Lens Size: RT-3 1/4 or equivalent T-3.25 designation (physical fit)
• Type: Incandescent (technology class)
• Color: Clear (optical specification)

Allowable Variation Parameters:

• MSCP: Substitute may have higher luminous intensity (0.65 MSCP vs. 0.34 MSCP) provided the application circuit accommodates increased brightness
• Lens Style: Round domed top is the specified form factor; substitutes must maintain this geometry
• Product Status: Active status substitutes are acceptable for obsolete parts

The CEC Industries 259 qualifies as a direct substitute based on matching voltage rating, wedge lead style, T-3.25 lens size (equivalent to RT-3 1/4), incandescent technology, and clear color specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CEC Industries 259

The CEC Industries 259 is the qualified substitute for the obsolete VCC 159 based on the following engineering criteria:

• Electrical Compatibility: Both components operate at 6.3V with identical voltage ratings, ensuring direct electrical substitution without circuit modification.
• Mechanical Compatibility: Wedge lead configuration (W2.1X9.5D base) is compatible with VCC 159 mounting sockets designed for wedge-style connections.
• Optical Compatibility: T-3.25 lens size is the industry-standard equivalent to RT-3 1/4, with clear color matching the original specification.
• Regulatory Compliance: Both components carry EAR99 ECCN classification and RoHS compliance certifications, meeting environmental and export requirements.
• Production Status: CEC Industries 259 is in active production with confirmed inventory availability (1121 Pcs), ensuring long-term supply continuity for the obsolete VCC 159.

Luminous Intensity Consideration: The CEC Industries 259 produces 0.65 MSCP compared to the VCC 159's 0.34 MSCP. This increased brightness is acceptable provided the application circuit is designed to accommodate higher luminous output without exceeding component current ratings or creating unintended visual effects.

Frequently Asked Questions (FAQ)

Q: Can the CEC Industries 259 be used as a direct replacement for the VCC 159 without any circuit modifications?

A: Yes, the CEC Industries 259 is electrically and mechanically compatible with the VCC 159. Both operate at 6.3V with identical wedge lead configurations. No circuit modifications are required for basic substitution. However, the increased MSCP output should be evaluated in the context of the application's brightness requirements.

Q: What does the T-3.25 designation mean, and how does it relate to RT-3 1/4?

A: T-3.25 and RT-3 1/4 are equivalent designations for incandescent lamp lens sizes. The "T" refers to tubular shape, and "3.25" indicates the diameter in eighths of an inch (3.25/8 = 0.40625 inches). RT-3 1/4 uses the same physical dimensions. Both are industry-standard sizes for low-voltage indicator lamps.

Q: What is the significance of the wedge lead style, and are other lead styles compatible?

A: The wedge lead style (W2.1X9.5D) is a specific mechanical connection format designed for push-fit sockets. Substitutes must use identical wedge lead configurations to ensure proper mechanical seating and electrical contact. Other lead styles (such as bayonet or screw base) are not compatible and would require socket replacement.

Q: Why does the CEC Industries 259 have higher MSCP than the VCC 159?

A: MSCP (Mean Spherical Candle Power) represents luminous intensity output. The CEC Industries 259 produces 0.65 MSCP versus the VCC 159's 0.34 MSCP, indicating approximately double the brightness. This difference may result from filament design or manufacturing improvements. Verify that the application circuit and optical design accommodate this increased output.

Q: Are there any packaging differences between the VCC 159 and CEC Industries 259?

A: The CEC Industries 259 is supplied in boxes of 10 units, whereas the VCC 159 packaging format is not specified in the available data. Confirm packaging requirements for your procurement and inventory management processes.

Q: What is the MSL (Moisture Sensitivity Level) rating, and why does it differ between the two parts?

A: MSL indicates moisture sensitivity during storage and handling. The VCC 159 has MSL 1 (Unlimited), meaning no moisture precautions are required. The CEC Industries 259 lists MSL as Not Applicable, indicating the component does not require moisture-controlled storage. Both are suitable for standard warehouse conditions.

Q: Are both parts RoHS compliant?

A: Yes. The VCC 159 is ROHS3 Compliant, and the CEC Industries 259 is RoHS Compliant. Both meet environmental and hazardous substance restrictions, making them suitable for applications requiring regulatory compliance.