1N5249C-TAP Equivalent & Substitute Parts

Part Overview

The 1N5249C-TAP is a 19 V zener diode rated for 500 mW power dissipation in a DO-35 through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Active and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	19 V
Power - Max	500 mW
Tolerance	±2%
Impedance (Max)	23 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
Operating Temperature	175°C
Package / Case	DO-204AH (DO-35)
Mounting Type	Through Hole
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the 1N5249C-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 19 V nominal
Power rating: 500 mW minimum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Reverse leakage current: 100 nA @ 14 V or lower
Forward voltage: 1.1 V to 1.2 V @ 200 mA
Tolerance: ±2% to ±5%
Product status: Active

Substitute parts identified:

1N5249BTR (Fairchild Semiconductor) – Direct electrical equivalent with relaxed tolerance (±5%) and extended operating temperature range
2EZ19D5 (Microchip Technology) – Higher power rating (2 W) with different package (DO-41) and modified electrical characteristics

Parameter Comparison

Parameter	1N5249C-TAP (Vishay)	1N5249BTR (Fairchild)	2EZ19D5 (Microchip)
Voltage - Zener (Nom)	19 V	19 V	19 V
Tolerance	±2%	±5%	±5%
Power - Max	500 mW	500 mW	2 W
Impedance (Max)	23 Ohms	23 Ohms	11 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	100 nA @ 14 V	500 nA @ 14.4 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature (Max)	175°C	200°C	150°C
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AL (DO-41)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Active	Active	Active

Engineering Selection Recommendations

1N5249BTR (Fairchild Semiconductor) is the primary substitute for the 1N5249C-TAP. Both components share identical zener voltage (19 V), power rating (500 mW), impedance (23 Ohms), and reverse leakage current specifications. The 1N5249BTR operates across an extended temperature range (-65°C to 200°C) compared to the 1N5249C-TAP (175°C maximum). Tolerance specification differs at ±5% versus ±2%, which may require circuit validation in precision applications. Both components use the DO-35 package and are suitable for direct pin-compatible replacement.

2EZ19D5 (Microchip Technology) is a functional substitute with significant design differences. The 2 W power rating provides four times the dissipation capability of the 1N5249C-TAP, making it suitable for higher-power applications. The DO-41 package differs from the DO-35, requiring mechanical redesign for board layout and mounting. The impedance specification (11 Ohms) is lower, and reverse leakage current is higher (500 nA @ 14.4 V). This component is appropriate when increased power handling is required and package change is acceptable.

All substitute parts maintain Active product status and RoHS3 compliance. Selection depends on application requirements for power dissipation, tolerance precision, and package compatibility.

Frequently Asked Questions (FAQ)

Q: Can 1N5249BTR replace 1N5249C-TAP in all applications?

A: The 1N5249BTR is electrically and mechanically compatible for direct replacement in applications where ±5% tolerance is acceptable. The identical zener voltage, power rating, and DO-35 package enable pin-for-pin substitution. Applications requiring ±2% tolerance precision require circuit validation.

Q: What is the primary difference between 1N5249BTR and 2EZ19D5?

A: The 1N5249BTR maintains the 500 mW power rating and DO-35 package of the original 1N5249C-TAP. The 2EZ19D5 provides 2 W power rating in a DO-41 package with lower impedance (11 Ohms). Selection depends on power dissipation requirements and whether package change is feasible.

Q: Is the 2EZ19D5 suitable for automotive applications?

A: The 2EZ19D5 is manufactured by Microchip Technology and carries RoHS3 compliance. The original 1N5249C-TAP holds AEC-Q101 automotive qualification. Automotive application requirements must be verified against specific design specifications and qualification standards.

Q: Can the DO-41 package (2EZ19D5) be used in place of the DO-35 package (1N5249C-TAP)?

A: The DO-41 and DO-35 packages differ in physical dimensions and lead spacing. Direct mechanical substitution requires board layout modification. Electrical functionality is maintained, but physical redesign is necessary.

Q: What is the impact of tolerance differences between these parts?

A: The 1N5249C-TAP specifies ±2% tolerance, while 1N5249BTR and 2EZ19D5 specify ±5%. In precision voltage regulation circuits, the wider tolerance may affect output voltage accuracy. Circuit design margins must accommodate the ±5% specification for substitute parts.

Q: Are all three parts suitable for high-temperature operation?

A: The 1N5249BTR operates to 200°C, the 1N5249C-TAP to 175°C, and the 2EZ19D5 to 150°C. Selection depends on application temperature requirements. The 1N5249BTR provides the highest temperature capability.

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