1N5996B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5996B-TP is a 6.8 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements. Equivalent parts maintain identical electrical specifications and package form factors, while substitute parts offer comparable functionality with variations in power rating, impedance, or package configuration.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	6.8 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	8 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 5.2 V
Voltage - Forward (Max) @ If	1.5 V @ 100 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N5996B-TP is determined by the following critical parameters: nominal Zener voltage (6.8 V), voltage tolerance (±5%), power dissipation capability (500 mW or higher), through-hole mounting configuration, and operating temperature range. Parts are grouped into two categories:

Direct Equivalents (500 mW, DO-35 Package): Parts maintaining identical power rating and package form factor with 6.8 V nominal Zener voltage and ±5% tolerance.

Functional Substitutes (Higher Power Rating or Different Package): Parts with 6.8 V nominal Zener voltage and ±5% tolerance but with increased power ratings (1 W or 3 W) or alternative through-hole packages (DO-41, Axial). These accommodate applications requiring higher power dissipation or different mechanical configurations while maintaining electrical compatibility at the Zener voltage specification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Operating Temp	Product Status	RoHS Status
1N5996B-TP	Micro Commercial Co	6.8 V	±5%	500 mW	8 Ohms	DO-35	-65°C ~ 200°C	Obsolete	ROHS3 Compliant
1N5235B	Microchip Technology	6.8 V	±5%	500 mW	5 Ohms	DO-35	-65°C ~ 175°C	Active	RoHS non-compliant
1N754A TR PBFREE	Central Semiconductor Corp	6.8 V	±5%	500 mW	5 Ohms	DO-35	-65°C ~ 200°C	Active	ROHS3 Compliant
1N4736ATR	onsemi	6.8 V	±5%	1 W	3.5 Ohms	DO-41	-65°C ~ 200°C	Active	ROHS3 Compliant
1N5063	Microchip Technology	6.8 V	±5%	3 W	2 Ohms	Axial	-65°C ~ 175°C	Active	Not specified
1N5235BTR	Fairchild Semiconductor	6.8 V	±5%	500 mW	5 Ohms	DO-35	-65°C ~ 200°C	Active	Not specified
1N957B-1	Microchip Technology	6.8 V	±5%	500 mW	4.5 Ohms	DO-35	-65°C ~ 175°C	Active	Not specified
BZX79C6V8	Taiwan Semiconductor Corporation	6.8 V	±5%	500 mW	15 Ohms	DO-35	-65°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Direct Equivalent: 1N754A TR PBFREE (Central Semiconductor Corp) provides the closest functional match to the 1N5996B-TP. This part maintains 6.8 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, and DO-35 package configuration. Operating temperature range extends to 200°C, matching the original specification. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with the original part's environmental certifications.

Secondary Direct Equivalent: 1N5235BTR (Fairchild Semiconductor) offers identical electrical specifications with 500 mW power rating and DO-35 package. Operating temperature range extends to 200°C. This part is suitable for applications where RoHS compliance status is not a constraint.

Higher Power Substitute: 1N4736ATR (onsemi) provides increased power dissipation (1 W) in a DO-41 through-hole package with 6.8 V nominal Zener voltage and ±5% tolerance. This part accommodates applications requiring higher thermal capacity while maintaining full operating temperature range (-65°C ~ 200°C) and ROHS3 compliance. Package change from DO-35 to DO-41 requires PCB layout modification.

Maximum Power Substitute: 1N5063 (Microchip Technology) offers 3 W power rating in an axial through-hole package with 6.8 V nominal Zener voltage and ±5% tolerance. This part is suitable for high-power voltage regulation applications. Operating temperature range is limited to -65°C ~ 175°C.

Compliance Consideration: For applications requiring ROHS3 compliance, select 1N754A TR PBFREE or 1N4736ATR. The 1N5235B variant is RoHS non-compliant and should not be used in regulated environments.

Frequently Asked Questions (FAQ)

Q: Can 1N5235B be used as a direct replacement for 1N5996B-TP?

A: 1N5235B maintains identical Zener voltage (6.8 V), tolerance (±5%), and power rating (500 mW) in the same DO-35 package. However, operating temperature range is limited to -65°C ~ 175°C compared to the original -65°C ~ 200°C specification. Additionally, 1N5235B is RoHS non-compliant. Use only in applications where the reduced temperature range and RoHS status are acceptable.

Q: What is the difference between 1N754A TR PBFREE and 1N5235BTR?

A: Both parts maintain 6.8 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, and DO-35 package. 1N754A TR PBFREE is ROHS3 compliant with operating temperature to 200°C. 1N5235BTR extends operating temperature to 200°C but RoHS compliance status is not specified. 1N754A TR PBFREE is the preferred choice for regulated applications.

Q: When should 1N4736ATR be selected instead of direct equivalents?

A: 1N4736ATR provides 1 W power rating compared to 500 mW in direct equivalents. Select this part for applications requiring higher power dissipation or thermal margin. The DO-41 package is physically larger than DO-35, requiring PCB layout modification. Zener voltage (6.8 V) and tolerance (±5%) remain identical.

Q: Is BZX79C6V8 suitable as a replacement?

A: BZX79C6V8 maintains 6.8 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, and DO-35 package. However, impedance (Zzt) is specified at 15 Ohms maximum, significantly higher than the original 8 Ohms specification. This higher impedance may affect voltage regulation performance in precision applications. Use only where impedance variation is acceptable.

Q: What are the package differences between DO-35 and DO-41?

A: Both are through-hole axial packages for Zener diodes. DO-35 (DO-204AH) is the smaller standard package used in the 1N5996B-TP. DO-41 (DO-204AL) is physically larger and accommodates higher power dissipation. Substitution from DO-35 to DO-41 requires PCB layout modification but maintains electrical compatibility.

Q: Can 1N5063 be used in place of 1N5996B-TP?

A: 1N5063 maintains 6.8 V nominal Zener voltage and ±5% tolerance but offers 3 W power rating in an axial package. Operating temperature range is limited to -65°C ~ 175°C. This part is suitable for high-power applications but requires PCB layout modification due to package change. Use only where increased power capacity is required and the reduced temperature range is acceptable.

Q: What does ROHS3 compliance mean for Zener diode selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For regulated applications or procurement requirements mandating RoHS compliance, select 1N754A TR PBFREE or 1N4736ATR. Parts with unspecified or non-compliant status should not be used in regulated environments.

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