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BZX85C24 Equivalent & Substitute Parts
Part Overview
The BZX85C24 is a 24 V, 1 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole package. This component is classified as obsolete, indicating discontinued production and limited availability. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring 24 V Zener regulation.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Zener (Nom) | 24 V |
| Power - Max | 1 W |
| Tolerance | ±6% |
| Impedance (Max) | 25 Ohms |
| Mounting Type | Through Hole |
| Package / Case | DO-204AL, DO-41, Axial |
| Operating Temperature Range | -65°C ~ 200°C |
Substitute Part Grouping Explanation
Substitution of the BZX85C24 is determined by the following critical parameters:
Primary Matching Criteria:
- Voltage - Zener (Nom): 24 V (exact match required)
- Mounting Type: Through Hole (axial configuration)
- Package / Case: DO-204AL or DO-41 compatible
- Power - Max: Equal to or greater than 1 W
- Impedance (Max): 25 Ohms (standard for this voltage class)
Secondary Compatibility Factors:
- Operating Temperature Range: Minimum -55°C to -65°C lower bound; minimum 150°C upper bound
- Tolerance: ±2% to ±6% acceptable
- Current - Reverse Leakage: Specified at rated voltage conditions
Substitute parts are grouped into two categories:
Direct Parametric Equivalents: Parts matching all primary criteria with identical or superior power ratings and temperature ranges.
Functional Substitutes: Parts with higher power dissipation capability (3 W) or lower power ratings (500 mW) that maintain core electrical specifications for 24 V Zener regulation in through-hole axial configuration.
Parameter Comparison
| Part Number | Manufacturer | Vz (Nom) | Power (Max) | Tolerance | Zzt (Max) | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|
| BZX85C24 | onsemi | 24 V | 1 W | ±6% | 25 Ω | -65°C ~ 200°C | DO-41 | Obsolete |
| 1N5934BRLG | onsemi | 24 V | 3 W | ±5% | 19 Ω | -65°C ~ 200°C | DO-41 | Active |
| 1N4749A | Lumimax Optoelectronic Technology | 24 V | 1 W | ±5% | 25 Ω | -65°C ~ 200°C | DO-41 | Active |
| BZX85C24-TR | Vishay General Semiconductor - Diodes Division | 24 V | 1.3 W | ±5% | 25 Ω | -55°C ~ 175°C | DO-41 | Active |
| 1EZ24D5-TP | Micro Commercial Co | 24 V | 500 mW | ±5% | 25 Ω | -55°C ~ 150°C | DO-41 | Active |
| 1N4749AP/TR12 | Microchip Technology | 24 V | 1 W | ±5% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
| 1N4749CE3/TR13 | Microchip Technology | 24 V | 1 W | ±2% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
| 1N4749CP/TR12 | Microchip Technology | 24 V | 1 W | ±2% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
| 1N4749CP/TR8 | Microchip Technology | 24 V | 1 W | ±2% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
| 1N4749CPE3/TR12 | Microchip Technology | 24 V | 1 W | ±2% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
| 1N4749CPE3/TR8 | Microchip Technology | 24 V | 1 W | ±2% | 25 Ω | -65°C ~ 150°C | DO-41 | Active |
Engineering Selection Recommendations
Preferred Direct Equivalents:
The 1N4749A (Lumimax Optoelectronic Technology) and 1N4749CE3/TR13 (Microchip Technology) are the closest parametric matches to the BZX85C24. Both maintain 24 V nominal voltage, 1 W power rating, 25 Ohm impedance, and -65°C to 200°C or -65°C to 150°C operating ranges. The 1N4749CE3/TR13 offers improved tolerance (±2%) and RoHS3 compliance. Both are in active production status with substantial inventory availability.
Higher Power Alternative:
The 1N5934BRLG (onsemi) provides 3 W power dissipation in the same DO-41 package with identical voltage and temperature specifications. This part is suitable for applications requiring thermal margin or higher current handling while maintaining the same footprint and pinout.
Automotive-Grade Option:
The BZX85C24-TR (Vishay General Semiconductor - Diodes Division) is AEC-Q101 qualified and RoHS3 compliant, suitable for automotive and industrial applications. It provides 1.3 W power rating with ±5% tolerance and operates across -55°C to 175°C.
Lower Power Alternative:
The 1EZ24D5-TP (Micro Commercial Co) is rated at 500 mW and is suitable for applications with reduced power dissipation requirements. Operating temperature range is -55°C to 150°C.
Compliance Considerations:
Parts with RoHS3 compliance status include 1N5934BRLG, 1N4749CE3/TR13, 1N4749CPE3/TR12, and 1N4749CPE3/TR8. All listed parts maintain REACH Unaffected status and EAR99 export classification.
Frequently Asked Questions (FAQ)
Q: Can the 1N5934BRLG (3 W) be used as a direct replacement for the BZX85C24 (1 W)?
A: Yes. The 1N5934BRLG maintains identical 24 V nominal voltage, DO-41 package configuration, and -65°C to 200°C operating range. The higher 3 W power rating provides additional thermal margin and does not affect circuit function. Electrical characteristics including impedance and forward voltage remain compatible.
Q: What is the difference between 1N4749CE3/TR13 and 1N4749CP/TR12?
A: Both parts share identical electrical specifications: 24 V, 1 W, ±2% tolerance, 25 Ohm impedance, and -65°C to 150°C operating range. The primary difference is RoHS compliance status: 1N4749CE3/TR13 is RoHS3 compliant, while 1N4749CP/TR12 is RoHS non-compliant. Packaging designation (TR13 vs TR12) indicates different tape reel configurations.
Q: Is the 1EZ24D5-TP suitable for all applications using the BZX85C24?
A: The 1EZ24D5-TP is suitable only for applications where power dissipation does not exceed 500 mW. The reduced power rating and narrower operating temperature range (-55°C to 150°C versus -65°C to 200°C) must be evaluated against circuit requirements. Voltage regulation and impedance characteristics remain equivalent.
Q: What is the significance of the ±2% tolerance in Microchip 1N4749 variants?
A: The ±2% tolerance (1N4749CE3/TR13, 1N4749CP/TR12, 1N4749CP/TR8, 1N4749CPE3/TR12, 1N4749CPE3/TR8) provides tighter voltage regulation compared to the BZX85C24 (±6%) and other ±5% variants. This improved tolerance is beneficial in precision voltage reference applications but does not affect basic substitution compatibility.
Q: Are all listed parts available in the same DO-41 axial through-hole package?
A: Yes. All substitute parts are specified for DO-204AL or DO-41 axial through-hole mounting. Physical dimensions and lead spacing are compatible with the BZX85C24 footprint. Packaging variants (Cut Tape, Tape & Reel, Bulk) refer to supply format only and do not affect component form factor.
Q: Which substitute part offers the best compliance profile for new designs?
A: The 1N4749CE3/TR13 (Microchip Technology) combines RoHS3 compliance, REACH Unaffected status, active production status, and ±2% tolerance specification. The BZX85C24-TR (Vishay) additionally provides AEC-Q101 automotive qualification for regulated applications.
Q: Can the BZX85C24-TR be used in non-automotive applications?
A: Yes. The BZX85C24-TR meets or exceeds all electrical specifications required for general-purpose 24 V Zener regulation. AEC-Q101 qualification indicates enhanced reliability and process control but does not restrict use to automotive applications.
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