Littelfuse 0469003.WR Equivalent & Substitute Parts

Part Overview

The Littelfuse 0469003.WR is a 3A 32VDC surface mount board mount fuse in 1206 (3216 Metric) package format with slow blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 150°C and carries CSA and UL approvals.

Substiute Parts

0469003.WR

Littelfuse Inc.In Stock: 7710469003.WR Datasheet

Current PartRFQ

SF-1206S300-2

Bourns Inc.In Stock: 20386SF-1206S300-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0469003.WR is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (DC): 32 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 1206 (3216 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)
• Breaking Capacity @ Rated Voltage: 50A (exact match required)

The Bourns Inc. SF-1206S300-2 meets all substitution criteria and is classified as an active product with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The Bourns SF-1206S300-2 is a direct functional equivalent for the obsolete Littelfuse 0469003.WR across all critical electrical and mechanical parameters. Both components share identical current rating, voltage rating, response time, package format, and breaking capacity specifications.

The Bourns substitute carries active product status with current manufacturing support and inventory availability (20,300 pcs in stock versus 662 pcs for the obsolete Littelfuse part). Both components maintain ROHS3 compliance and MSL 1 moisture sensitivity ratings.

Design considerations: The Bourns part operates within a narrower temperature range (-20°C to 105°C) compared to the original (-55°C to 150°C). Applications requiring operation below -20°C or above 105°C require thermal performance verification. The original part carries dual CSA and UL approvals; the Bourns substitute carries UL approval only. Applications requiring CSA certification must confirm acceptance of UL-only certification status.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SF-1206S300-2 be used as a direct replacement for the Littelfuse 0469003.WR?

A: Yes, the Bourns part meets all critical substitution parameters: 3A current rating, 32V DC voltage rating, slow blow response, 1206 package format, 50A breaking capacity, and surface mount configuration. Both components are electrically and mechanically equivalent.

Q: What are the key differences between these parts?

A: The primary differences are product status (Littelfuse is obsolete; Bourns is active), operating temperature range (Littelfuse: -55°C to 150°C; Bourns: -20°C to 105°C), and approval agencies (Littelfuse: CSA and UL; Bourns: UL only). Electrical and mechanical specifications are identical.

Q: Are there temperature limitations with the Bourns substitute?

A: The Bourns SF-1206S300-2 operates between -20°C and 105°C. If your application requires operation outside this range, particularly below -20°C or above 105°C, thermal performance must be verified against design requirements.

Q: Does the Bourns part have the same package dimensions?

A: Both parts use the 1206 (3216 Metric) package format. Physical dimensions differ slightly: Littelfuse is 3.27mm L × 1.63mm W × 0.90mm H; Bourns is 3.10mm L × 1.55mm W × 0.60mm H. These differences are within standard 1206 package tolerances and do not affect PCB layout compatibility.

Q: What certifications does the Bourns substitute carry?

A: The Bourns SF-1206S300-2 carries UL approval. The original Littelfuse part carries both CSA and UL approvals. Applications requiring CSA certification must confirm that UL-only certification meets regulatory requirements.

Q: Is the Bourns part currently available?

A: Yes, the Bourns SF-1206S300-2 is an active product with 20,300 pieces in stock, providing reliable procurement continuity compared to the obsolete Littelfuse part.