MMBZ4708-G3-08 Equivalent & Substitute Parts

Part Overview

The MMBZ4708-G3-08 is a 22 V Zener diode rated at 350 mW in a surface mount SOT-23-3 package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, indicating that direct replacement with active production alternatives is necessary for new designs and ongoing procurement. Equivalent and substitute parts maintain the core electrical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±5%	—
Power - Max	350	mW
Current - Reverse Leakage @ Vr	10	nA @ 16.7 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBZ4708-G3-08 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 22 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (350 mW or higher acceptable)
Voltage tolerance (±5% or tighter acceptable)
Operating temperature range (-55°C to 150°C minimum)
Reverse leakage current specifications

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Full Power Rating Match (350 mW): Parts maintaining the original 350 mW specification provide direct functional equivalence with no thermal derating considerations.

Category B - Reduced Power Rating (225 mW): Parts with 225 mW ratings are suitable for applications where thermal margins permit lower power dissipation, provided circuit design accommodates the reduced rating.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Temp Range	Status	Automotive Grade
MMBZ4708-G3-08	Vishay	22 V	±5%	350 mW	—	10 nA @ 16.7 V	-55 to 150°C	Obsolete	—
BZX84C22 TR	Central Semiconductor	22 V	±5%	350 mW	55 Ω	50 nA @ 15.4 V	-65 to 150°C	Active	—
BZX84C22LT1G	onsemi	22 V	±6%	225 mW	55 Ω	50 nA @ 15.4 V	-65 to 150°C	Active	—
CZRT55C22-G	Comchip Technology	22 V	±6%	350 mW	55 Ω	100 nA @ 15.4 V	-65 to 150°C	Active	—
SZBZX84B22LT1G	onsemi	22 V	±2%	225 mW	55 Ω	50 nA @ 15.4 V	-65 to 150°C	Active	AEC-Q101
SZBZX84C22LT3G	onsemi	22 V	±6%	225 mW	55 Ω	50 nA @ 15.4 V	-65 to 150°C	Active	AEC-Q101

Engineering Selection Recommendations

For Direct Replacement (350 mW Power Rating):

BZX84C22 TR (Central Semiconductor) provides the closest functional match to the MMBZ4708-G3-08. This part maintains the 350 mW power rating, 22 V nominal voltage, and ±5% tolerance. The part is in active production status with extended operating temperature range (-65°C to 150°C). RoHS3 compliance and unlimited moisture sensitivity level are maintained.

CZRT55C22-G (Comchip Technology) offers an alternative with identical 350 mW power rating and 22 V specification. This part is actively produced and RoHS3 compliant. The tolerance specification is ±6%, which remains within acceptable design margins for most applications.

For Reduced Power Dissipation Applications (225 mW Power Rating):

BZX84C22LT1G (onsemi) is suitable for applications where thermal constraints permit lower power dissipation. This part features active production status, RoHS3 compliance, and extended temperature range. The ±6% tolerance is acceptable for standard voltage regulation applications.

SZBZX84B22LT1G (onsemi) provides automotive-grade qualification (AEC-Q101) with ±2% tolerance, the tightest tolerance specification available among substitutes. This part is recommended for automotive and high-reliability applications requiring enhanced voltage accuracy. Active production status and RoHS3 compliance are confirmed.

SZBZX84C22LT3G (onsemi) offers automotive-grade qualification (AEC-Q101) with ±6% tolerance and active production status. This part is suitable for automotive applications where AEC-Q101 qualification is required.

Selection Criteria Summary:

All substitute parts maintain SOT-23-3 package compatibility
All substitute parts are RoHS3 compliant
All substitute parts feature unlimited moisture sensitivity level (MSL 1)
All substitute parts are in active production status
Power rating selection depends on circuit thermal design requirements
Automotive applications should prioritize SZBZX84B22LT1G or SZBZX84C22LT3G for AEC-Q101 qualification

Frequently Asked Questions (FAQ)

Q: Can BZX84C22 TR be used as a direct replacement for MMBZ4708-G3-08?

A: Yes. BZX84C22 TR maintains the 22 V nominal voltage, ±5% tolerance, and 350 mW power rating. The SOT-23-3 package is identical. The part is in active production, addressing the obsolescence of the original component.

Q: What is the difference between the 350 mW and 225 mW substitute options?

A: The 350 mW parts (BZX84C22 TR and CZRT55C22-G) match the original power dissipation rating. The 225 mW parts (BZX84C22LT1G, SZBZX84B22LT1G, SZBZX84C22LT3G) have reduced power ratings and are suitable for applications with lower thermal requirements. Circuit design must accommodate the lower power rating if selected.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and maintain unlimited moisture sensitivity level (MSL 1).

Q: Which substitute part is recommended for automotive applications?

A: SZBZX84B22LT1G and SZBZX84C22LT3G are both automotive-grade parts with AEC-Q101 qualification. SZBZX84B22LT1G offers tighter tolerance (±2%) and is preferred for applications requiring enhanced voltage accuracy.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate from -65°C to 150°C, which exceeds the original MMBZ4708-G3-08 range of -55°C to 150°C, providing improved low-temperature performance.

Q: Can substitute parts with ±6% tolerance replace the ±5% original specification?

A: Yes, for most applications. The ±6% tolerance remains within acceptable design margins for standard voltage regulation. Applications requiring tighter tolerance control should select SZBZX84B22LT1G (±2% tolerance).

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All listed substitute parts are supplied in tape and reel (TR) packaging, suitable for automated assembly processes.

Q: What is the reverse leakage current specification for substitute parts?

A: Substitute parts specify reverse leakage current at 15.4 V (50 nA to 100 nA range), compared to the original specification of 10 nA at 16.7 V. These specifications are functionally equivalent for standard applications.

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