1N6014B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N6014B is a 39 V, 500 mW Zener diode in DO-35 axial through-hole package manufactured by onsemi. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The 1N6014B series provides voltage regulation and transient protection in electronic circuits requiring 39 V nominal Zener voltage with ±5% tolerance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	—
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	—
Operating Temperature	-65°C ~ 200°C	—
Mounting Type	Through Hole	—
Package / Case	DO-35	—

Substitute Part Grouping Explanation

Substitution of the 1N6014B is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 39 V nominal
Power dissipation: 500 mW minimum
Tolerance: ±5% or tighter
Package: DO-35 axial through-hole
Mounting: Through hole

Secondary Compatibility Factors:

Impedance (Zzt): 130 Ohms or lower
Reverse leakage current: 100 nA or lower at specified voltage
Forward voltage: Compatible with 1.2 V @ 200 mA or lower
Operating temperature range: Minimum -65°C to +175°C

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Same Package, Power Rating, Tolerance) Parts meeting all primary criteria with identical or superior electrical characteristics and active product status.

Category 2: Functional Alternatives (Different Package or Power Rating) Parts meeting voltage and tolerance requirements but with different physical package or power dissipation ratings, suitable for applications where package constraints are relaxed.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Operating Temp	Product Status
1N6014B	onsemi	39 V	±5%	500 mW	130 Ω	DO-35	-65°C ~ 200°C	Obsolete
1N5750B	Microchip Technology	39 V	±5%	500 mW	130 Ω	DO-35	-65°C ~ 175°C	Active
1N6014A	Microchip Technology	39 V	±10%	500 mW	170 Ω	DO-35	-65°C ~ 175°C	Active
1N6014B	Microchip Technology	39 V	±5%	500 mW	130 Ω	DO-35	-65°C ~ 175°C	Active
1N6014C	Microchip Technology	39 V	±2%	500 mW	130 Ω	DO-35	-65°C ~ 175°C	Active
1N6014D	Microchip Technology	39 V	±1%	500 mW	130 Ω	DO-35	-65°C ~ 175°C	Active
2EZ39D5-AP	Micro Commercial Co	39 V	±5%	2 W	30 Ω	DO-41	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation: 1N6014B (Microchip Technology)

The 1N6014B from Microchip Technology is the direct equivalent to the obsolete onsemi 1N6014B. This part maintains identical electrical specifications including 39 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 130 Ohms maximum impedance, and DO-35 package. The part is in active production status, ensuring long-term availability. Operating temperature range is -65°C to 175°C, which covers the lower end of the original specification but remains suitable for most industrial and commercial applications.

Secondary Recommendation: 1N5750B (Microchip Technology)

The 1N5750B provides equivalent electrical performance to the 1N6014B with identical voltage, tolerance, power rating, impedance, and package specifications. This part is actively manufactured and offers the same functional characteristics for direct substitution in existing designs.

Higher Precision Alternative: 1N6014C or 1N6014D (Microchip Technology)

For applications requiring tighter voltage tolerance, the 1N6014C (±2% tolerance) and 1N6014D (±1% tolerance) are available from Microchip Technology. Both maintain the same 39 V nominal voltage, 500 mW power rating, 130 Ohms impedance, and DO-35 package. These parts are suitable for precision voltage regulation applications where tighter tolerance is beneficial.

Relaxed Tolerance Alternative: 1N6014A (Microchip Technology)

The 1N6014A offers ±10% tolerance with identical voltage, power rating, and package. This part is suitable for applications where tolerance requirements are less stringent. Maximum impedance is 170 Ohms, which is higher than the original specification.

Higher Power Alternative: 2EZ39D5-AP (Micro Commercial Co)

The 2EZ39D5-AP is a 39 V Zener diode with 2 W power dissipation in DO-41 package. This part is suitable for applications requiring higher power handling capability. The DO-41 package is physically larger than DO-35. Operating temperature range is -55°C to 150°C, which is narrower than the original specification. Lower impedance (30 Ohms) provides improved voltage regulation characteristics.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the onsemi 1N6014B with the Microchip 1N6014B?

A: Yes. Both parts share identical electrical specifications: 39 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 130 Ohms maximum impedance, and DO-35 axial through-hole package. The Microchip version is in active production, making it the direct replacement for the obsolete onsemi part.

Q: What is the difference between 1N6014A, 1N6014B, 1N6014C, and 1N6014D?

A: These parts differ in voltage tolerance specification. The 1N6014A has ±10% tolerance, 1N6014B has ±5% tolerance, 1N6014C has ±2% tolerance, and 1N6014D has ±1% tolerance. All maintain 39 V nominal voltage and 500 mW power rating in DO-35 package. Selection depends on the precision required by the application.

Q: Can I use the 1N5750B instead of the 1N6014B?

A: Yes. The 1N5750B provides identical electrical performance with 39 V nominal voltage, ±5% tolerance, 500 mW power rating, 130 Ohms impedance, and DO-35 package. Both parts are functionally equivalent for direct substitution.

Q: Is the 2EZ39D5-AP a suitable replacement?

A: The 2EZ39D5-AP is a functional alternative for applications where higher power dissipation (2 W versus 500 mW) is beneficial. However, it uses a different package (DO-41 instead of DO-35), which may require PCB layout modifications. Operating temperature range is also narrower (-55°C to 150°C versus -65°C to 175°C). Verify package compatibility before selection.

Q: What is the operating temperature difference between the onsemi and Microchip versions?

A: The onsemi 1N6014B operates from -65°C to 200°C, while the Microchip 1N6014B operates from -65°C to 175°C. The Microchip version has a 25°C lower maximum operating temperature. For applications operating above 175°C, the original onsemi specification must be verified against alternative sources.

Q: Which substitute part should I choose for a precision voltage regulation circuit?

A: For precision applications, select the 1N6014D (±1% tolerance) or 1N6014C (±2% tolerance). Both maintain the same 39 V nominal voltage, 500 mW power rating, and DO-35 package as the original part, with tighter voltage tolerance specifications.

Q: Are all substitute parts RoHS compliant?

A: The Microchip 1N6014 series (1N6014A, 1N6014B, 1N6014C, 1N6014D) and 1N5750B are listed as RoHS non-compliant. The 2EZ39D5-AP does not specify RoHS status in the provided data. Verify RoHS compliance requirements for your specific application before final part selection.

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