BZX79C27 Equivalent & Substitute Parts

Part Overview

The BZX79C27 is a 27 V zener diode rated at 500 mW with ±5% tolerance, manufactured by onsemi in DO-35 through-hole packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BZX79C27 operates across a temperature range of -65°C to 200°C and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 18.9 V	-
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	-
Operating Temperature	-65°C to 200°C	-
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BZX79C27 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 27 V (exact match required)
Tolerance: ±5% or tighter (±5% or ±10% acceptable for less stringent applications)
Power - Max: 500 mW or greater
Mounting Type: Through Hole
Package / Case: DO-35 or equivalent axial configuration
Operating Temperature Range: Must encompass or match -65°C to 200°C

Substitution Categories:

Direct Substitutes (Nexperia BZX79-C27 Series): Parts BZX79-C27,113, BZX79-C27,133, and BZX79-C27,143 are direct functional equivalents manufactured by Nexperia USA Inc. and NXP Semiconductors. These parts maintain 27 V nominal zener voltage, ±5% tolerance, and through-hole DO-35 packaging. Power rating is 400 mW, which is lower than the original 500 mW specification but remains suitable for applications not requiring maximum power dissipation.

Similar Substitutes (Microchip and Microsemi): Parts 1N3528A, 1N4118, 1N4711, 1N5254A, 1N5254B, and 1N5254B-TR maintain the 27 V zener voltage and ±5% tolerance (1N5254A uses ±10%). These parts are available in DO-35 packaging with 500 mW or 400 mW power ratings and operate within compatible temperature ranges.

Higher Power Alternative: Part 1N5076 provides 27 V zener voltage with 3 W power rating in axial through-hole configuration, suitable for applications requiring higher power dissipation than the original 500 mW specification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Product Status	Temp Range
BZX79C27	onsemi	27 V	±5%	500 mW	80 Ω	DO-35	Obsolete	-65°C to 200°C
BZX79-C27,113	NXP Semiconductors	27 V	±5%	400 mW	80 Ω	DO-35	Active	-65°C to 200°C
BZX79-C27,133	Nexperia USA Inc.	27 V	±5%	400 mW	80 Ω	DO-35	Active	-65°C to 200°C
BZX79-C27,143	Nexperia USA Inc.	27 V	±5%	400 mW	80 Ω	DO-35	Active	-65°C to 200°C
1N3528A	Microchip Technology	27 V	±5%	500 mW	40 Ω	DO-35	Active	-65°C to 175°C
1N4118 (DO35)	Microsemi Corporation	27 V	±5%	400 mW	150 Ω	DO-35	Active	-65°C to 200°C
1N4711 (DO35)	Microsemi Corporation	27 V	±5%	500 mW	-	DO-35	Active	-65°C to 175°C
1N5076	Microchip Technology	27 V	±5%	3 W	12 Ω	Axial	Active	-65°C to 175°C
1N5254A (DO-35)	Microsemi Corporation	27 V	±10%	500 mW	41 Ω	DO-35	Active	-65°C to 175°C
1N5254B (DO-35)	Microsemi Corporation	27 V	±5%	500 mW	41 Ω	DO-35	Active	-65°C to 175°C
1N5254B-TR	Vishay General Semiconductor	27 V	±5%	500 mW	41 Ω	DO-35	Active	-

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

The BZX79-C27,113, BZX79-C27,133, and BZX79-C27,143 from Nexperia are recommended as primary substitutes. All three maintain identical electrical specifications (27 V, ±5% tolerance, 80 Ω impedance) and operate across the full -65°C to 200°C temperature range. The 400 mW power rating is suitable for applications where the original 500 mW specification is not a limiting constraint. These parts are currently in active production status with substantial inventory availability.

For Matched Power Rating (500 mW):

The 1N5254B-TR (Vishay) and 1N5254B (Microsemi) provide 500 mW power rating matching the original BZX79C27 specification, with 27 V nominal voltage and ±5% tolerance in DO-35 packaging. The 1N5254B-TR carries RoHS3 compliance certification. The 1N3528A (Microchip) and 1N4711 (Microsemi) also provide 500 mW ratings with 27 V specification.

For Extended Temperature Range:

The BZX79-C27 series and 1N4118 maintain the full -65°C to 200°C operating range. Alternative parts including 1N3528A, 1N4711, 1N5254A, and 1N5254B operate to -65°C to 175°C, which is acceptable for most applications but does not extend to the upper 200°C limit.

For Higher Power Dissipation Applications:

The 1N5076 (Microchip) provides 3 W power rating with 27 V specification in axial through-hole configuration, suitable for applications requiring significantly higher power handling than the original 500 mW specification.

Compliance Considerations:

The BZX79-C27,133 and BZX79-C27,143 carry RoHS3 compliance certification. The 1N5254B-TR carries RoHS3 compliance. All listed parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the BZX79-C27,113 replace the BZX79C27 directly?

A: Yes. The BZX79-C27,113 maintains the same 27 V nominal zener voltage, ±5% tolerance, 80 Ω impedance, and -65°C to 200°C operating temperature range. The power rating is 400 mW versus the original 500 mW. Direct substitution is valid for applications where 400 mW power dissipation is sufficient.

Q: What is the difference between BZX79-C27,113, BZX79-C27,133, and BZX79-C27,143?

A: These three part numbers are electrically identical with the same 27 V, ±5%, 400 mW, and 80 Ω specifications. The differences are in packaging format: BZX79-C27,113 is supplied in Bulk, BZX79-C27,133 in Cut Tape (CT), and BZX79-C27,143 in Tape & Box (TB). Selection depends on procurement and assembly requirements.

Q: Why do some substitutes have ±10% tolerance instead of ±5%?

A: The 1N5254A carries ±10% tolerance versus the original ±5%. This wider tolerance may be acceptable in applications with less stringent voltage regulation requirements. For applications requiring ±5% tolerance, select 1N5254B or equivalent parts with matching tolerance specification.

Q: Is the 1N5076 suitable as a substitute?

A: The 1N5076 maintains 27 V nominal voltage and ±5% tolerance but differs in package configuration (Axial versus DO-35) and power rating (3 W versus 500 mW). It is suitable for applications requiring higher power dissipation but requires board layout modification due to different package geometry.

Q: What is the impedance difference between substitute parts?

A: Impedance values vary across substitutes: BZX79C27 and BZX79-C27 series specify 80 Ω, while 1N3528A specifies 40 Ω, 1N4118 specifies 150 Ω, and 1N5254 series specify 41 Ω. Lower impedance provides better voltage regulation stability. Higher impedance may affect circuit performance in precision voltage regulation applications.

Q: Are all substitute parts available in DO-35 packaging?

A: All listed substitutes except 1N5076 are available in DO-35 through-hole packaging. The 1N5076 is supplied in Axial configuration. Verify packaging requirements before final part selection.

Q: Which substitute has the best compliance certifications?

A: The BZX79-C27,133, BZX79-C27,143, and 1N5254B-TR carry RoHS3 compliance certification. All listed parts maintain REACH Unaffected status and EAR99 export classification.

Q: Can I use 1N5254A instead of 1N5254B?

A: Both parts maintain 27 V nominal voltage, 500 mW power rating, and DO-35 packaging. The primary difference is tolerance: 1N5254A is ±10% while 1N5254B is ±5%. For applications requiring ±5% tolerance matching the original BZX79C27, use 1N5254B.

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