BZT03D160-TR Equivalent & Substitute Parts

Part Overview

The BZT03D160-TR is a 160 V Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1.3 W maximum power dissipation in a SOD-57 axial through-hole package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	160	V
Tolerance	±5.63%	%
Power - Max	1.3	W
Impedance (Max)	350	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 120 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 500 mA
Operating Temperature	175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	SOD-57, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BZT03D160-TR is determined by the following critical parameters: nominal Zener voltage (160 V), maximum power rating, impedance characteristics, reverse leakage current, forward voltage drop, operating temperature range, and through-hole mounting compatibility.

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalent (MFR Recommended) Parts that maintain identical electrical specifications and package form factor, differing only in packaging format or product status transition from obsolete to active.

Category 2: Parametric Equivalent (MFR Recommended) Parts that satisfy the core electrical requirements (160 V Zener voltage, through-hole mounting) but may differ in power rating, impedance, or package dimensions. These parts function identically in circuit operation within the specified parameter ranges.

The key parameters determining substitution eligibility are:

Voltage - Zener (Nom): 160 V
Mounting Type: Through Hole
Package Category: Axial configuration
Power - Max: ≥ 1.3 W
Operating Temperature: ≥ 175°C

Parameter Comparison

Parameter	BZT03D160-TR (Main)	BZT03C160-TR	1N4987	2EZ160D5
Manufacturer	Vishay	Vishay	Microchip Technology	Microsemi Corporation
Voltage - Zener (Nom)	160 V	160 V	160 V	160 V
Tolerance	±5.63%	±5.63%	±5%	±5%
Power - Max	1.3 W	1.3 W	5 W	2 W
Impedance (Max)	350 Ohms	350 Ohms	350 Ohms	650 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 120 V	1 µA @ 120 V	2 µA @ 121.6 V	500 nA @ 121.6 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 500 mA	1.2 V @ 500 mA	1.5 V @ 1 A	1.2 V @ 200 mA
Operating Temperature	175°C (TJ)	175°C (TJ)	-65°C ~ 175°C	-65°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	SOD-57, Axial	SOD-57, Axial	E, Axial	DO-204AL (DO-41), Axial
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

BZT03C160-TR (Primary Substitute) This part is the manufacturer-recommended direct equivalent. It maintains identical electrical specifications (160 V, 1.3 W, ±5.63% tolerance, 350 Ohms impedance) and package form factor (SOD-57, Axial) as the BZT03D160-TR. The primary distinction is product status transition from obsolete to active, with packaging format change from bulk to Tape & Reel (TR). This part is ROHS3 compliant and represents the optimal substitution path for new designs and production continuity.

1N4987 (Secondary Substitute) This Microchip Technology part satisfies the core electrical requirement of 160 V Zener voltage and through-hole axial mounting. It provides superior power handling capability (5 W versus 1.3 W), enabling operation in higher dissipation environments. The impedance specification (350 Ohms) matches the main part. However, this part is RoHS non-compliant and exhibits higher forward voltage drop (1.5 V @ 1 A). Selection of this part is appropriate for legacy systems or applications where RoHS compliance is not mandated.

2EZ160D5 (Tertiary Substitute) This Microsemi Corporation part maintains the 160 V Zener voltage specification and through-hole axial mounting configuration. It provides intermediate power handling (2 W) and exhibits superior reverse leakage characteristics (500 nA @ 121.6 V). The impedance specification is higher (650 Ohms) and maximum operating temperature is reduced to 150°C. This part is RoHS non-compliant. Selection is appropriate for applications requiring lower leakage current and moderate power dissipation where the reduced temperature rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BZT03C160-TR be used as a direct replacement for BZT03D160-TR? A: Yes. BZT03C160-TR is the manufacturer-recommended equivalent with identical electrical specifications and SOD-57 package form factor. The only differences are product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). No circuit modifications are required.

Q: What is the primary reason for substituting the BZT03D160-TR? A: The BZT03D160-TR is classified as obsolete, indicating manufacturer discontinuation. Substitution ensures component availability for production, repair, and system support activities.

Q: Are there package compatibility considerations when selecting a substitute? A: Yes. The BZT03C160-TR maintains the SOD-57 axial package, ensuring direct mechanical and electrical compatibility. The 1N4987 uses package type E (axial), and the 2EZ160D5 uses DO-204AL (DO-41) package. While all three are axial through-hole configurations, physical dimensions may differ. Verification of PCB footprint compatibility is required for 1N4987 and 2EZ160D5 substitutions.

Q: What are the compliance implications of selecting 1N4987 or 2EZ160D5? A: Both 1N4987 and 2EZ160D5 are RoHS non-compliant, whereas BZT03D160-TR and BZT03C160-TR are ROHS3 compliant. Selection of non-compliant parts may restrict use in applications subject to RoHS regulations. BZT03C160-TR is the compliant substitute option.

Q: How do power ratings affect substitution decisions? A: The main part is rated for 1.3 W maximum power dissipation. BZT03C160-TR maintains this rating. The 1N4987 provides 5 W capability, suitable for higher dissipation applications. The 2EZ160D5 provides 2 W capability. Higher power ratings do not restrict substitution; they enable operation in more demanding thermal environments. Lower power ratings would restrict substitution.

Q: What is the significance of impedance differences among substitute parts? A: The main part and BZT03C160-TR specify 350 Ohms maximum impedance. The 2EZ160D5 specifies 650 Ohms. Impedance affects transient response and voltage regulation characteristics. The 1N4987 matches the 350 Ohms specification. Higher impedance values may result in slower transient response but do not prevent functional substitution in standard voltage regulation applications.

Q: Are there reverse leakage current differences that affect circuit performance? A: The main part specifies 1 µA @ 120 V. The 1N4987 specifies 2 µA @ 121.6 V, and the 2EZ160D5 specifies 500 nA @ 121.6 V. These differences are minor and do not affect circuit performance in standard applications. The 2EZ160D5 exhibits superior leakage characteristics, beneficial for low-current precision applications.

Q: What operating temperature considerations apply to substitute selection? A: The main part specifies 175°C maximum junction temperature. BZT03C160-TR maintains this specification. The 1N4987 specifies -65°C to 175°C operating range. The 2EZ160D5 specifies -65°C to 150°C, with reduced maximum temperature. For applications requiring full 175°C operation, BZT03C160-TR or 1N4987 are appropriate selections.

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