1N5378B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5378B is a 5W, 100V axial zener diode manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement of the original part number may present supply chain challenges. The 1N5378B serves as a voltage regulation and transient protection element in electronic circuits requiring stable reference voltages or overvoltage suppression at the 100V level.

Due to its obsolete status, equivalent substitute parts with identical electrical and mechanical specifications are available from the same manufacturer. These substitutes maintain full compatibility with applications originally designed for the 1N5378B while offering improved availability and active product support.

Substiute Parts

1N5378B

onsemiIn Stock: 237001N5378B Datasheet

Current PartRFQ

1N5378BG

onsemiIn Stock: 11381N5378BG Datasheet

DirectRFQ

1N5378BRLG

onsemiIn Stock: 36931N5378BRLG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5378B is determined by equivalence across all critical electrical parameters and mechanical form factor. The substitute parts 1N5378BG and 1N5378BRLG are direct functional equivalents of the 1N5378B, sharing identical specifications for:

• Zener voltage: 100 V nominal
• Maximum power dissipation: 5 W
• Voltage tolerance: ±5%
• Maximum impedance: 90 Ohms
• Reverse leakage current: 500 nA @ 76 V
• Forward voltage: 1.2 V @ 1 A
• Operating temperature range: -65°C to 200°C
• Package type: T-18 Axial (Through Hole)

The primary distinction between substitute parts lies in packaging format: 1N5378BG is supplied in Bulk packaging, while 1N5378BRLG is supplied in Cut Tape (CT) packaging. Both substitutes are manufactured by onsemi and carry active product status with ROHS3 compliance, addressing the obsolescence and compliance limitations of the original 1N5378B.

Parameter Comparison

Engineering Selection Recommendations

Both 1N5378BG and 1N5378BRLG are direct substitutes for the obsolete 1N5378B. Selection between these two active alternatives is determined by procurement and assembly requirements rather than electrical performance.

1N5378BG (Bulk Packaging): This substitute is appropriate for high-volume manufacturing environments where components are processed through automated pick-and-place systems or manual assembly with bulk component bins. Bulk packaging reduces per-unit cost in large-quantity orders.

1N5378BRLG (Cut Tape Packaging): This substitute is appropriate for medium-volume production, just-in-time (JIT) inventory management, and applications requiring component traceability through tape-and-reel format. Cut tape packaging facilitates automated component handling and reduces waste in lower-volume assembly operations.

Both substitutes provide ROHS3 compliance, addressing regulatory requirements that the original 1N5378B does not meet. Both maintain identical electrical specifications and T-18 axial package form factor, ensuring direct mechanical and functional compatibility with existing circuit designs and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can 1N5378BG and 1N5378BRLG be used interchangeably with 1N5378B?

A: Yes. Both substitutes are electrically and mechanically identical to the 1N5378B. The only differences are product status (active versus obsolete) and packaging format (Bulk versus Cut Tape). All three parts share identical zener voltage (100 V), power rating (5 W), tolerance (±5%), impedance (90 Ohms), leakage current, forward voltage, operating temperature range, and T-18 axial package configuration.

Q: What is the difference between Bulk and Cut Tape packaging?

A: Bulk packaging supplies components in loose form, typically in bags or trays, suitable for manual assembly or high-volume automated processes with bulk feeders. Cut Tape (CT) packaging supplies components on continuous tape with carrier backing, designed for automated tape-fed component placement equipment. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Why is the 1N5378B listed as obsolete?

A: The 1N5378B is classified as obsolete by the manufacturer, indicating that production has been discontinued and future availability cannot be guaranteed. The active substitutes 1N5378BG and 1N5378BRLG provide continued access to the same electrical and mechanical specifications through current manufacturing.

Q: Are there compliance differences between the main part and substitutes?

A: Yes. The 1N5378B is RoHS non-compliant, while both 1N5378BG and 1N5378BRLG are ROHS3 compliant. All three parts maintain identical REACH Unaffected status, EAR99 export classification, and HTSUS code. For applications subject to RoHS regulations, the substitute parts are required.

Q: Will substituting these parts require PCB layout changes?

A: No. All three parts use the T-18 axial package with identical through-hole pin configuration and spacing. Direct substitution on existing PCBs is supported without layout modification.

Q: What inventory considerations apply to these substitutes?

A: The 1N5378B has 23,655 pieces in stock but is obsolete. The 1N5378BG (Bulk) has 1,041 pieces in stock, and the 1N5378BRLG (Cut Tape) has 3,595 pieces in stock. Both substitutes are active products with ongoing manufacturing support.