BZX85C22 Equivalent & Substitute Parts

Part Overview

The BZX85C22 is a through-hole Zener diode manufactured by onsemi, rated at 22 V nominal Zener voltage with 1 W maximum power dissipation in a DO-41 (DO-204AL) axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BZX85C22 operates across a temperature range of -65°C to 200°C with ±6% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±6%	—
Power - Max	1	W
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 15.5 V	—
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	—
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the BZX85C22 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 22 V nominal
Mounting type: Through Hole
Package compatibility: DO-41 or equivalent axial packages (DO-204AL, DO-204AH, DO-35)

Secondary Compatibility Factors:

Power rating: 1 W (primary), 500 mW (reduced power applications), or 5 W (higher power applications)
Voltage tolerance: ±6% or tighter (±5%, ±2%)
Operating temperature range: -65°C minimum to 150°C or higher
Impedance and reverse leakage characteristics

Substitute parts are grouped into three categories based on power rating and package type:

Direct 1 W Equivalents (DO-41 Package): Parts with identical 1 W power rating and DO-41 packaging, including 1N4748A, 1N4748AP/TR12, 1N4748CE3/TR13, 1N4748CP/TR12, 1N4748CP/TR8, 1N4748CPE3/TR12, and 1N4748P/TR12.
Reduced Power Alternatives (500 mW): Parts with half the power rating in DO-41 or DO-35 packages, including 1N5251B and 1EZ22D5-TP, suitable for lower-power applications.
Higher Power Alternative (5 W): The 1N5358BRLG provides increased power dissipation capacity in an axial package for applications requiring greater thermal headroom.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Temp Range	Product Status
BZX85C22	onsemi	22 V	±6%	1 W	25 Ω	DO-41	-65 to 200°C	Obsolete
1N4748A	Lumimax Optoelectronic Technology	22 V	±5%	1 W	23 Ω	DO-41G	-65 to 200°C	Active
1N5251B	Microchip Technology	22 V	±5%	500 mW	29 Ω	DO-35	-65 to 175°C	Active
1N5358BRLG	onsemi	22 V	±5%	5 W	3.5 Ω	Axial	-65 to 200°C	Active
1EZ22D5-TP	Micro Commercial Co	22 V	±5%	500 mW	23 Ω	DO-41	-55 to 150°C	Active
1N4748AP/TR12	Microchip Technology	22 V	±5%	1 W	23 Ω	DO-41	-65 to 150°C	Active
1N4748CE3/TR13	Microchip Technology	22 V	±2%	1 W	23 Ω	DO-41	-65 to 150°C	Active
1N4748CP/TR12	Microchip Technology	22 V	±2%	1 W	23 Ω	DO-41	-65 to 150°C	Active
1N4748CP/TR8	Microchip Technology	22 V	±2%	1 W	23 Ω	DO-41	-65 to 150°C	Active
1N4748CPE3/TR12	Microchip Technology	22 V	±2%	1 W	23 Ω	DO-41	-65 to 150°C	Active
1N4748P/TR12	Microchip Technology	22 V	±10%	1 W	23 Ω	DO-41	-65 to 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (1 W, DO-41 Package):

The 1N4748 series from Microchip Technology provides the most direct substitution path for the BZX85C22. Among the 1N4748 variants, the 1N4748CE3/TR13 and 1N4748CPE3/TR12 are recommended as primary choices due to their RoHS3 compliance status and tighter ±2% voltage tolerance, which exceeds the original ±6% specification. The 1N4748AP/TR12 offers an alternative with ±5% tolerance and active product status. All 1N4748 variants maintain the 1 W power rating and DO-41 package format, ensuring mechanical and electrical compatibility.

The 1N4748A from Lumimax Optoelectronic Technology is also a direct equivalent with ±5% tolerance, 1 W power rating, and extended operating temperature range to 200°C, matching the original BZX85C22 thermal specification.

For Reduced Power Applications (500 mW):

The 1N5251B (Microchip Technology) and 1EZ22D5-TP (Micro Commercial Co) are suitable substitutes where power dissipation requirements are half that of the original specification. Both maintain 22 V Zener voltage and through-hole mounting. The 1EZ22D5-TP retains the DO-41 package, while the 1N5251B uses the DO-35 package. Selection between these depends on available board space and thermal design margins.

For Higher Power Applications (5 W):

The 1N5358BRLG from onsemi provides a 5 W power rating in an axial package, suitable for applications requiring greater power dissipation. This part maintains 22 V Zener voltage, RoHS3 compliance, and the full -65°C to 200°C operating temperature range. The significantly lower impedance (3.5 Ω) provides improved voltage regulation characteristics.

Compliance Considerations:

Parts with RoHS3 compliance status (1N4748CE3/TR13, 1N4748CPE3/TR12, 1N5358BRLG) are preferred for new designs. All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original BZX85C22.

Frequently Asked Questions (FAQ)

Q: Can the 1N4748 series directly replace the BZX85C22?

A: Yes. The 1N4748 series maintains the critical electrical parameters: 22 V Zener voltage, 1 W power rating, and DO-41 through-hole package. Voltage tolerance is tighter (±2% to ±5%) than the original ±6%, ensuring improved performance. Operating temperature range is -65°C to 150°C, which covers most applications, though the original extends to 200°C.

Q: What is the difference between 1N4748AP/TR12, 1N4748CP/TR12, and 1N4748P/TR12?

A: These variants differ in voltage tolerance and RoHS compliance. The 1N4748AP/TR12 has ±5% tolerance and RoHS non-compliant status. The 1N4748CP/TR12 has ±2% tolerance and RoHS non-compliant status. The 1N4748P/TR12 has ±10% tolerance and RoHS non-compliant status. All share identical 1 W power rating, DO-41 package, and -65°C to 150°C operating range. Selection depends on tolerance requirements and compliance mandates.

Q: When should I use the 1N5251B instead of the 1N4748?

A: The 1N5251B is a 500 mW device suitable for applications with lower power dissipation requirements. Use this part when thermal constraints or circuit design limits power to 500 mW or less. The trade-off is reduced power handling capacity; the original 1 W rating cannot be relied upon with this substitute.

Q: Is the 1N5358BRLG a suitable replacement for the BZX85C22?

A: The 1N5358BRLG is electrically compatible (22 V Zener voltage) but rated at 5 W instead of 1 W. This part is suitable for applications requiring higher power dissipation or where thermal margin is critical. The lower impedance (3.5 Ω versus 25 Ω) provides superior voltage regulation. Package format is axial, consistent with the original. Use this part when power requirements exceed 1 W or when improved regulation is needed.

Q: What is the impact of voltage tolerance differences?

A: The BZX85C22 has ±6% tolerance. Most substitutes offer ±5% or ±2% tolerance, which is tighter and provides better voltage accuracy. The 1N4748P/TR12 has ±10% tolerance, which is looser. For precision voltage regulation applications, select parts with ±2% or ±5% tolerance. For general-purpose applications, ±6% to ±10% tolerance is acceptable.

Q: Can I use the 1EZ22D5-TP in place of the BZX85C22?

A: The 1EZ22D5-TP is a 500 mW device with 22 V Zener voltage in a DO-41 package, making it mechanically compatible. However, the reduced power rating (500 mW versus 1 W) and narrower operating temperature range (-55°C to 150°C versus -65°C to 200°C) limit its use to applications within these specifications. Verify that your circuit does not exceed 500 mW dissipation and operates within the stated temperature range.

Q: Are all substitute parts RoHS compliant?

A: No. RoHS compliance varies by part number. The 1N4748CE3/TR13, 1N4748CPE3/TR12, and 1N5358BRLG are RoHS3 compliant. The 1N4748AP/TR12, 1N4748CP/TR12, 1N4748CP/TR8, and 1N4748P/TR12 are RoHS non-compliant. The 1N5251B is RoHS non-compliant. The 1N4748A and 1EZ22D5-TP do not specify RoHS status in the provided data. For new designs subject to RoHS requirements, select RoHS3 compliant parts.

Q: What is the difference between DO-41 and DO-35 packages?

A: Both are through-hole axial packages for Zener diodes. DO-41 (DO-204AL) and DO-35 (DO-204AH) differ in physical dimensions and lead spacing. The 1N5251B uses DO-35 packaging, while most other substitutes use DO-41. Verify PCB footprint compatibility before selecting a part with a different package designation.

Q: Which substitute offers the best overall compatibility with the BZX85C22?

A: The 1N4748A from Lumimax Optoelectronic Technology provides the closest overall match: 22 V Zener voltage, 1 W power rating, ±5% tolerance, DO-41 package, and -65°C to 200°C operating temperature range. This part is active, has high inventory availability (10,645 pcs), and maintains all critical electrical and thermal specifications of the original BZX85C22.

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