BZX55C24_T50R Equivalent & Substitute Parts

Part Overview

The BZX55C24_T50R is a 24 V zener diode rated at 500 mW with ±6% tolerance, manufactured by onsemi in a DO-35 through-hole axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part 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
Voltage - Zener (Nom)	24 V
Tolerance	±6%
Power - Max	500 mW
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 100 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial

Substitute Part Grouping Explanation

Substitution of the BZX55C24_T50R is determined by the following critical parameters: nominal zener voltage of 24 V, through-hole axial mounting configuration, and power dissipation capability. All substitute parts listed maintain the 24 V nominal zener voltage specification, which is the primary functional requirement. Substitute parts are grouped into two categories based on power rating alignment:

Category 1: 500 mW Power Rating (Direct Functional Equivalents) Parts maintaining the original 500 mW power specification: 1EZ24D5-TP and NZX24B,133. These substitutes provide equivalent power handling capacity for applications with identical thermal and electrical load requirements.

Category 2: Higher Power Rating (Upgraded Capability) Parts with 1.5 W or 3 W power ratings: 1N5934BP-TP, 1N5934B3P-TP, and 1N5075. These substitutes provide enhanced power dissipation capability and are suitable for applications requiring higher current handling or thermal margin.

All substitute parts maintain through-hole axial mounting compatibility and operate within acceptable temperature ranges for the intended application.

Parameter Comparison

Parameter	BZX55C24_T50R	1EZ24D5-TP	1N5075	1N5934B3P-TP	1N5934BP-TP	NZX24B,133
Manufacturer	onsemi	Micro Commercial Co	Microchip Technology	Micro Commercial Co	Micro Commercial Co	Nexperia USA Inc.
Voltage - Zener (Nom)	24 V	24 V	24 V	24 V	24 V	24.15 V
Tolerance	±6%	±5%	±5%	±5%	±5%	±2%
Power - Max	500 mW	500 mW	3 W	3 W	1.5 W	500 mW
Impedance (Max)	80 Ohms	25 Ohms	10 Ohms	19 Ohms	19 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	5 µA @ 18.2 V	5 µA @ 18.2 V	1 µA @ 18.2 V	1 µA @ 18.2 V	50 nA @ 16.8 V
Operating Temperature	-65°C ~ 200°C	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AL, DO-41, Axial	Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (500 mW Applications)

The 1EZ24D5-TP and NZX24B,133 are suitable direct replacements for the BZX55C24_T50R in applications where the 500 mW power rating is sufficient. Both parts are active products with current manufacturing support. The NZX24B,133 offers superior tolerance (±2% versus ±6%) and lower impedance (70 Ohms versus 80 Ohms), providing tighter voltage regulation. However, the NZX24B,133 operates to a maximum temperature of 175°C, which is below the original part's 200°C specification. The 1EZ24D5-TP operates to 150°C maximum, further reducing the upper temperature range. Selection between these two should be based on specific application temperature requirements.

For Enhanced Power Capability (Higher Current Applications)

The 1N5934BP-TP provides 1.5 W power rating with an operating temperature range of -55°C to 175°C, offering a balance between power capability and temperature range. The 1N5934B3P-TP and 1N5075 provide 3 W power ratings for applications requiring significantly higher current handling. The 1N5075 maintains the original -65°C lower temperature limit, making it suitable for extended low-temperature operation. All higher-power substitutes are active products with established supply chains.

Compliance and Regulatory Status

All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original part. The 1N5934BP-TP and NZX24B,133 are RoHS3 compliant, providing additional environmental compliance assurance for new designs.

Frequently Asked Questions (FAQ)

Q: Can the 1EZ24D5-TP be used as a direct replacement for the BZX55C24_T50R?

A: The 1EZ24D5-TP maintains the same 24 V nominal voltage and 500 mW power rating, making it functionally equivalent for applications within its operating temperature range of -55°C to 150°C. The original part operates to 200°C, so applications requiring operation above 150°C require alternative selection.

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

A: The BZX55C24_T50R uses the DO-35 package, while several substitutes use the DO-41 package. Both are through-hole axial packages with similar form factors. DO-41 is slightly larger than DO-35. Physical board layout compatibility should be verified before substitution.

Q: Why does the NZX24B,133 have a nominal voltage of 24.15 V instead of 24 V?

A: The NZX24B,133 is specified with a nominal voltage of 24.15 V. Within its ±2% tolerance band, this part operates between 23.67 V and 24.63 V. The original BZX55C24_T50R with ±6% tolerance operates between 22.56 V and 25.44 V. Application voltage regulation requirements determine whether this difference is acceptable.

Q: Should I use a higher power-rated substitute if my application only requires 500 mW?

A: Higher power-rated substitutes such as the 1N5934BP-TP (1.5 W) or 1N5075 (3 W) are electrically compatible with 500 mW applications. The increased power rating provides thermal margin and improved reliability under transient conditions. Selection should be based on board space availability and thermal design requirements.

Q: Are all substitute parts currently in production?

A: All listed substitute parts carry Active product status, indicating current manufacturing and availability. The original BZX55C24_T50R is classified as Obsolete and is no longer in production.

Q: What is the significance of impedance differences between substitute parts?

A: Impedance (Zzt) affects voltage regulation quality under varying load conditions. Lower impedance provides better voltage stability. The 1N5075 has the lowest impedance at 10 Ohms, while the original part has 80 Ohms. Applications requiring precise voltage regulation benefit from lower impedance substitutes.

Q: Can I use the 1N5934B3P-TP in place of the BZX55C24_T50R?

A: The 1N5934B3P-TP maintains the 24 V nominal voltage and provides enhanced 3 W power capability. However, its maximum operating temperature is 150°C, compared to the original part's 200°C. This substitute is suitable for applications operating within -55°C to 150°C temperature range.

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