BZX85C27 Equivalent & Substitute Parts

Part Overview

The BZX85C27 is a 27 V, 1 W Zener diode manufactured by onsemi in DO-41 through-hole axial package. This component is classified as obsolete, though 32,752 units remain in stock. Zener diodes of this specification are used for voltage regulation and protection in electronic circuits. Due to the obsolete status of the BZX85C27, equivalent substitute parts with matching or enhanced electrical characteristics are available from multiple manufacturers to ensure design continuity and supply chain reliability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Power - Maximum	1	W
Tolerance	±7%	—
Impedance (Maximum)	30	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 19 V	—
Voltage - Forward (Maximum) @ If	1.2 V @ 200 mA	—
Operating Temperature Range	-65°C to 200°C	—
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the BZX85C27 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nominal): 27 V (exact match required)
Mounting Type: Through Hole (axial configuration)
Package / Case: DO-41 or DO-204AL compatible

Secondary Compatibility Criteria:

Power - Maximum: Equal to or greater than 1 W
Tolerance: ±7% or tighter (±5% acceptable)
Impedance (Maximum): 30 Ohms or lower
Operating Temperature Range: Must encompass or exceed -65°C to 200°C
Current - Reverse Leakage: 500 nA @ 19 V or lower

Substitute parts are grouped into three categories based on power rating: 1 W equivalents (direct replacement), 1.3–1.5 W intermediate ratings (enhanced capability), and 2–5 W higher-power variants (for applications requiring increased power dissipation). All substitute parts maintain the 27 V nominal zener voltage and through-hole axial mounting configuration.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance	Zzt (Ohms)	Ir @ Vr	Vf @ If	Temp Range (°C)	Package	Status
BZX85C27	onsemi	27	1	±7%	30	500 nA @ 19 V	1.2 V @ 200 mA	-65 to 200	DO-41	Obsolete
1N4750A	Lumimax Optoelectronic Technology	27	1	±5%	35	5 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 200	DO-41G	Active
BZX85C27-TR	Vishay General Semiconductor - Diodes Division	27	1.3	±5%	30	500 nA @ 20 V	—	-55 to 175	DO-41	Active
1EZ27D5-TP	Micro Commercial Co	27	1	±5%	35	5 µA @ 20.6 V	1.2 V @ 200 mA	-55 to 150	DO-41	Active
1N5935BP-TP	Micro Commercial Co	27	1.5	±5%	23	1 µA @ 20.6 V	1.5 V @ 200 mA	-55 to 175	DO-41	Active
2EZ27D5	Microsemi Corporation	27	2	±5%	18	500 nA @ 20.6 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active
1N5935BRLG	onsemi	27	3	±5%	23	1 µA @ 20.6 V	1.5 V @ 200 mA	-65 to 200	Axial	Active
1N5076	Microchip Technology	27	3	±5%	12	1 µA @ 20.6 V	—	-65 to 175	Axial	Active
1N5361B	Microsemi Corporation	27	5	±5%	5	500 nA @ 19.4 V	1.2 V @ 1 A	-65 to 150	T-18	Active
1N5935B3P-AP	Micro Commercial Co	27	3	±5%	23	1 µA @ 20.6 V	1.5 V @ 200 mA	-55 to 175	DO-41	Active
1N5935B3P-TP	Micro Commercial Co	27	3	±5%	23	1 µA @ 20.6 V	1.5 V @ 200 mA	-55 to 175	DO-41	Active

Engineering Selection Recommendations

Direct 1 W Equivalents (Recommended for Pin-Compatible Replacement):

The 1N4750A, 1EZ27D5-TP, and BZX85C27-TR are direct functional equivalents to the BZX85C27. All three maintain 27 V nominal zener voltage and 1 W (or 1.3 W) power rating in DO-41 through-hole package. The 1N4750A and 1EZ27D5-TP offer tighter ±5% tolerance compared to the original ±7%. The BZX85C27-TR from Vishay carries AEC-Q101 automotive qualification and ROHS3 compliance, making it suitable for automotive and regulated applications. All three are in active production status.

Enhanced Power Rating Substitutes (1.5–3 W):

The 1N5935BP-TP (1.5 W), 1N5935B3P-AP, 1N5935B3P-TP, and 1N5935BRLG (3 W) provide increased power dissipation capability while maintaining 27 V zener voltage and DO-41 or axial package compatibility. These parts are suitable for applications requiring higher current handling or thermal margin. The 1N5935BRLG from onsemi maintains the full -65°C to 200°C operating temperature range of the original part.

High-Power Variants (2–5 W):

The 2EZ27D5 (2 W) and 1N5361B (5 W) offer significantly enhanced power ratings for demanding applications. The 2EZ27D5 maintains compatibility with -65°C lower temperature limit. The 1N5361B uses a T-18 package (larger form factor) and is not RoHS compliant; selection requires verification of mechanical space and regulatory requirements.

Compliance and Availability:

All substitute parts are in active production status. The BZX85C27-TR, 1N5935BP-TP, and 2EZ27D5 carry ROHS3 compliance. Inventory availability ranges from 661 to 50,100 units across the substitute options.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5 W or 3 W zener diode as a direct replacement for the 1 W BZX85C27?

A: Yes. Higher power-rated zener diodes with identical 27 V nominal voltage and compatible through-hole axial packaging function as direct replacements. The increased power rating provides additional thermal margin and current handling capability without affecting circuit operation. The 1N5935BP-TP (1.5 W) and 1N5935B3P-TP (3 W) are suitable direct substitutes.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL refer to the same through-hole axial diode package. DO-204AL is the formal JEDEC designation; DO-41 is the industry shorthand. Parts specified with either designation are mechanically and electrically interchangeable in through-hole applications.

Q: Why does the BZX85C27-TR have a narrower operating temperature range (-55°C to 175°C) compared to the original (-65°C to 200°C)?

A: The BZX85C27-TR is qualified to AEC-Q101 automotive standards, which specify a -55°C to 175°C operating range. This narrower range is standard for automotive-grade components. Selection of this part requires verification that the application temperature requirements fall within this range.

Q: Is the 1N5361B with T-18 package compatible with a circuit designed for DO-41 package?

A: The T-18 package is a larger axial form factor than DO-41. While electrically equivalent, the T-18 package requires verification of available board space and lead spacing. The 1N5361B is suitable only if mechanical constraints permit the larger package dimensions.

Q: What does ±5% tolerance mean compared to the original ±7%?

A: Tolerance specifies the allowable deviation of the zener voltage from the nominal 27 V value. ±5% tolerance (±1.35 V) is tighter than ±7% (±1.89 V), meaning the substitute part maintains zener voltage closer to the nominal specification. Tighter tolerance improves voltage regulation accuracy in circuit applications.

Q: Can I substitute a part with higher reverse leakage current?

A: Reverse leakage current affects standby power consumption and voltage regulation precision. The original BZX85C27 specifies 500 nA @ 19 V. Substitutes with higher leakage (such as 5 µA @ 20.6 V in the 1N4750A) are acceptable if the application tolerates increased standby current. Critical precision voltage regulation applications should prioritize lower leakage specifications.

Q: Are all substitute parts RoHS compliant?

A: No. The 1N5361B is explicitly RoHS non-compliant. The BZX85C27-TR, 1N5935BP-TP, and 2EZ27D5 carry ROHS3 compliance. Regulatory requirements for the end application determine whether RoHS compliance is mandatory.

Q: What is the significance of the AEC-Q101 qualification on the BZX85C27-TR?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. This certification indicates the part meets automotive reliability, temperature cycling, and performance requirements. Selection of AEC-Q101 qualified parts is required for automotive applications; it is optional for general industrial or consumer applications.

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