BZX84C24-7 Equivalent & Substitute Parts

Part Overview

The BZX84C24-7 is a 24 V Zener diode rated at 300 mW with ±6% tolerance, manufactured by Diodes Incorporated in SOT-23-3 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications and mechanical compatibility, while substitute parts offer functional alternatives with variations in tolerance, power rating, or manufacturer.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±6%	—
Power - Max	300	mW
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 16.8 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX84C24-7 is determined by the following critical parameters: nominal Zener voltage (24 V), package type (SOT-23-3), mounting method (surface mount), operating temperature range (-65°C to 150°C), and forward voltage characteristics (900 mV @ 10 mA). All substitute parts listed maintain the 24 V nominal Zener voltage and SOT-23-3 package compatibility.

Substitutes are grouped into three categories based on allowed parameter variations:

Category 1: Direct Parametric Equivalents — Parts with identical 24 V rating, 300 mW power, ±6% tolerance, and 70 Ohm impedance. These parts are fully interchangeable with the original BZX84C24-7.

Category 2: Tolerance-Improved Equivalents — Parts with 24 V rating, 300 mW power, but tighter tolerance (±2%) and 70 Ohm impedance. These provide enhanced voltage accuracy while maintaining power rating.

Category 3: Power-Reduced Substitutes — Parts with 24 V rating, reduced power rating (225 mW), and varying impedance (33 or 70 Ohms). These are suitable for applications where maximum power dissipation is not a limiting factor.

Category 4: Power-Enhanced Substitutes — Parts with 24 V rating and increased power rating (350 mW). These provide additional thermal margin in power-constrained applications.

All substitute parts maintain the 900 mV forward voltage specification and -65°C to 150°C operating temperature range. Impedance variations (33 Ohms vs. 70 Ohms) affect dynamic response characteristics but do not prevent functional substitution in standard voltage regulation applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Package	RoHS Status	Product Status
BZX84C24-7	Diodes Inc.	24	±6%	300	70	900	-65 to 150	SOT-23-3	Non-compliant	Discontinued
BZX84B24-7-F	Diodes Inc.	24	±2%	300	70	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
BZX84C24-7-F	Diodes Inc.	24	±6%	300	70	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
BZX84B24LT1G	onsemi	24	±2%	225	70	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
BZX84C24-TP	Micro Commercial Co	24	±5%	350	70	900	-55 to 150	SOT-23-3	ROHS3 Compliant	Active
BZX84C24LT1G	onsemi	24	±6%	225	70	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
MMBZ5252B-TP	Micro Commercial Co	24	±5%	350	33	900	-55 to 150	SOT-23-3	ROHS3 Compliant	Active
MMBZ5252BLT1G	onsemi	24	±5%	225	33	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
SZBZX84C24LT1G	onsemi	24	±6%	225	70	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
SZMMBZ5252BLT1G	onsemi	24	±5%	225	33	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

BZX84C24-7-F (Diodes Incorporated) is the primary direct replacement. This part maintains the original ±6% tolerance, 300 mW power rating, and 70 Ohm impedance while offering ROHS3 compliance and active product status. Packaging is available in Tape & Reel format with 2700 units in stock.

For RoHS Compliance with Enhanced Tolerance:

BZX84B24-7-F (Diodes Incorporated) provides ROHS3 compliance with improved ±2% tolerance while maintaining 300 mW power and 70 Ohm impedance. This part is suitable for applications requiring tighter voltage regulation. 8962 units are in stock.

For Automotive Applications:

BZX84C24-7-F (Diodes Incorporated) carries AEC-Q101 qualification, meeting automotive reliability standards. SZBZX84C24LT1G (onsemi) also provides AEC-Q101 qualification with ±6% tolerance and 225 mW power rating. SZMMBZ5252BLT1G (onsemi) offers AEC-Q101 qualification with ±5% tolerance, 225 mW power, and 33 Ohm impedance.

For Power-Constrained Applications:

BZX84C24LT1G (onsemi) and SZBZX84C24LT1G (onsemi) both provide 225 mW power rating with ±6% tolerance and 70 Ohm impedance. These are suitable where thermal dissipation is limited. MMBZ5252BLT1G (onsemi) and SZMMBZ5252BLT1G (onsemi) offer 225 mW with 33 Ohm impedance for improved dynamic response.

For Enhanced Power Margin:

BZX84C24-TP (Micro Commercial Co) and MMBZ5252B-TP (Micro Commercial Co) provide 350 mW power rating. BZX84C24-TP maintains 70 Ohm impedance with ±5% tolerance. MMBZ5252B-TP offers 33 Ohm impedance with ±5% tolerance. Operating temperature minimum is -55°C for these parts.

For onsemi Sourcing:

BZX84B24LT1G (onsemi) provides ±2% tolerance with 225 mW power and 70 Ohm impedance. BZX84C24LT1G (onsemi) offers ±6% tolerance with 225 mW power and 70 Ohm impedance. Both maintain full -65°C to 150°C operating range with ROHS3 compliance.

All substitute parts maintain the 24 V nominal Zener voltage, SOT-23-3 package compatibility, 900 mV forward voltage specification, and surface mount mounting type required for PCB integration.

Frequently Asked Questions (FAQ)

Q: Can BZX84C24-7-F be used as a direct replacement for BZX84C24-7?

A: Yes. BZX84C24-7-F maintains identical electrical specifications: 24 V nominal Zener voltage, ±6% tolerance, 300 mW power rating, 70 Ohm impedance, and SOT-23-3 package. The primary difference is active product status and ROHS3 compliance. Packaging format differs (Tape & Reel vs. bulk), but electrical performance is equivalent.

Q: What is the difference between BZX84B24-7-F and BZX84C24-7-F?

A: The primary difference is tolerance specification. BZX84B24-7-F provides ±2% tolerance compared to ±6% for BZX84C24-7-F. Both maintain 24 V nominal voltage, 300 mW power, 70 Ohm impedance, and SOT-23-3 package. The tighter tolerance of the B-series part provides improved voltage regulation accuracy.

Q: Can parts with 225 mW power rating replace the 300 mW BZX84C24-7?

A: Substitution depends on application power dissipation requirements. Parts such as BZX84B24LT1G, BZX84C24LT1G, SZBZX84C24LT1G, MMBZ5252BLT1G, and SZMMBZ5252BLT1G all provide 225 mW power rating. These are suitable for applications where maximum power dissipation does not exceed 225 mW. If the original design requires 300 mW dissipation capability, these parts are not appropriate substitutes.

Q: What is the significance of impedance differences (33 Ohms vs. 70 Ohms)?

A: Impedance (Zzt) affects the dynamic response of the Zener diode during transient voltage changes. Lower impedance (33 Ohms) provides faster response to load transients. Higher impedance (70 Ohms) has slower transient response. Both values are acceptable for standard voltage regulation applications. Selection depends on specific circuit transient requirements.

Q: Are onsemi parts compatible with Diodes Incorporated part footprints?

A: Yes. All substitute parts use the SOT-23-3 package (TO-236-3, SC-59), which is a standardized surface mount package. PCB footprints are identical across manufacturers. Electrical specifications (24 V nominal, 900 mV forward voltage, operating temperature range) are compatible with standard circuit designs.

Q: Which substitute parts are suitable for automotive applications?

A: BZX84C24-7-F (Diodes Incorporated), SZBZX84C24LT1G (onsemi), and SZMMBZ5252BLT1G (onsemi) carry AEC-Q101 qualification, meeting automotive reliability and qualification standards. These parts are appropriate for automotive circuit designs requiring qualified components.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging provides components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) provides components on tape segments, suitable for lower-volume or manual assembly. Both formats contain identical components; packaging format selection depends on assembly process requirements.

Q: Can BZX84C24-TP or MMBZ5252B-TP be used in applications requiring -65°C minimum operating temperature?

A: No. BZX84C24-TP and MMBZ5252B-TP specify -55°C minimum operating temperature, compared to -65°C for the original BZX84C24-7. These parts are not suitable for applications requiring operation below -55°C. Use BZX84C24-7-F, BZX84B24-7-F, or onsemi alternatives that maintain -65°C minimum temperature.

Q: What is the inventory status of substitute parts?

A: BZX84C24-7-F (2700 units), BZX84B24-7-F (8962 units), BZX84C24-TP (14006 units), BZX84C24LT1G (17200 units), BZX84B24LT1G (51100 units), MMBZ5252B-TP (3900 units), MMBZ5252BLT1G (32100 units), SZBZX84C24LT1G (9100 units), and SZMMBZ5252BLT1G (35000 units) are all in stock. Highest inventory availability is SZMMBZ5252BLT1G (35000 units) and BZX84B24LT1G (51100 units).

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original BZX84C24-7 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed substitute parts satisfy this requirement.

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