BZX84C4V7 Equivalent & Substitute Parts

Part Overview

The BZX84C4V7 is a surface mount Zener diode manufactured by onsemi with a nominal Zener voltage of 4.7 V and maximum power dissipation of 350 mW in SOT-23-3 packaging. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with variations in power rating, tolerance, or manufacturing grade.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±6%	—
Power - Max	350	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the BZX84C4V7 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 4.7 V (exact match required)
Tolerance: ±6% or tighter (±5%, ±2%, ±1% acceptable)
Impedance (Max): 80 Ohms (exact match)
Current - Reverse Leakage @ Vr: 3 µA @ 2 V (exact match)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (exact match)

Power Rating Flexibility:

Original part: 350 mW maximum
Substitutes with 225 mW or 250 mW are acceptable for applications not requiring full 350 mW dissipation
Substitutes with 300 mW or 350 mW provide equivalent or superior power handling

Package Compatibility:

All substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging
Mechanical and electrical pin configurations are identical

Operating Temperature Range:

Original part: -55°C to 150°C
Substitutes with -65°C to 150°C provide extended low-temperature operation
All substitutes maintain upper temperature limit of 150°C

Product Status and Compliance:

Original part is obsolete; active substitutes are required for new designs
RoHS3 compliance and REACH unaffected status maintained across all active substitutes
Automotive-grade variants (SZBZX84 series) include AEC-Q101 qualification

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Status	Grade
BZX84C4V7	onsemi	4.7 V	±6%	350 mW	80 Ω	900 mV @ 10 mA	-55 to 150°C	Obsolete	Standard
BZX84C4V7LT1G	onsemi	4.7 V	±6%	225 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Standard
BZX84C4V7LT3G	onsemi	4.7 V	±6%	225 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Standard
SZBZX84C4V7LT1G	onsemi	4.7 V	±6%	225 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Automotive
SZBZX84C4V7LT3G	onsemi	4.7 V	±6%	225 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Automotive
CZRT55C4V7-G	Comchip Technology	4.7 V	±6%	350 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Standard
BZX84C4V7-7-F	Diodes Incorporated	4.7 V	±6%	300 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Standard
BZX84-A4V7,215	Nexperia USA Inc.	4.7 V	±1%	250 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Automotive
BZX84-C4V7,215	NXP USA Inc.	4.7 V	±5%	250 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Automotive
BZX84-C4V7,235	Nexperia USA Inc.	4.7 V	±5%	250 mW	80 Ω	900 mV @ 10 mA	-65 to 150°C	Active	Automotive
BZX84B4V7-TP	Micro Commercial Co	4.7 V	±2%	350 mW	80 Ω	900 mV @ 10 mA	-55 to 150°C	Active	Standard

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Substitution):

The BZX84C4V7 is obsolete and must be replaced with an active equivalent. Selection depends on application requirements and supply chain availability:

Option 1: Equivalent Power Rating (350 mW)

CZRT55C4V7-G (Comchip Technology): Maintains 350 mW power rating with extended temperature range (-65°C to 150°C) and active product status. RoHS3 compliant.
BZX84B4V7-TP (Micro Commercial Co): Maintains 350 mW power rating with tighter tolerance (±2%) and active product status. Operating temperature range -55°C to 150°C matches original part. RoHS3 compliant.

Option 2: Reduced Power Rating (225–250 mW)

BZX84C4V7LT1G or BZX84C4V7LT3G (onsemi): Same manufacturer as original part with 225 mW rating, extended temperature range, and active status. Suitable for applications not requiring full 350 mW dissipation.
BZX84-C4V7,235 (Nexperia USA Inc.): 250 mW rating with ±5% tolerance, automotive grade, AEC-Q101 qualified, extended temperature range.

Option 3: Automotive Applications

SZBZX84C4V7LT1G or SZBZX84C4V7LT3G (onsemi): Automotive-grade variants with AEC-Q101 qualification, 225 mW rating, extended temperature range.
BZX84-A4V7,215 (Nexperia USA Inc.): Automotive-grade with tighter tolerance (±1%), 250 mW rating, AEC-Q101 qualified.

Option 4: Intermediate Power Rating (300 mW)

BZX84C4V7-7-F (Diodes Incorporated): 300 mW rating provides balance between original 350 mW and reduced-power alternatives, extended temperature range, active status, RoHS3 compliant.

All recommended substitutes maintain identical Zener voltage (4.7 V), impedance (80 Ohms), reverse leakage current (3 µA @ 2 V), and forward voltage (900 mV @ 10 mA) specifications. Package compatibility (SOT-23-3) is maintained across all options.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower power rating (225 mW) instead of the original 350 mW part?

A: Yes, if your circuit design does not require the full 350 mW dissipation capability. Lower power-rated substitutes (BZX84C4V7LT1G, BZX84C4V7LT3G, BZX84-C4V7,235) are electrically equivalent and maintain all critical Zener parameters. Verify that your application's maximum power dissipation does not exceed the substitute part's rating.

Q: What is the difference between standard and automotive-grade variants?

A: Automotive-grade variants (SZBZX84C4V7LT1G, SZBZX84C4V7LT3G, BZX84-A4V7,215, BZX84-C4V7,235) include AEC-Q101 qualification, indicating compliance with automotive reliability and quality standards. These parts are suitable for automotive and high-reliability applications. Standard-grade parts are suitable for general industrial and consumer applications.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Does tolerance variation affect substitutability?

A: All substitute parts maintain tolerance specifications of ±6% or tighter (±5%, ±2%, ±1%). Tighter tolerances (±1%, ±2%) provide improved voltage accuracy and are backward compatible with ±6% tolerance requirements. Select based on your circuit's voltage regulation requirements.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Digi-Reel packaging are suitable for manual assembly and small-volume production. Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Electrical specifications are identical; selection depends on assembly process requirements.

Q: Can I use BZX84C4V7-7-F (300 mW) as a direct replacement for BZX84C4V7 (350 mW)?

A: Yes. The 300 mW rating provides adequate margin for most applications while offering improved availability from Diodes Incorporated. Verify that your maximum circuit power dissipation does not exceed 300 mW. All other electrical parameters are identical.

Q: Why does the original BZX84C4V7 have a narrower operating temperature range (-55°C to 150°C) compared to substitutes (-65°C to 150°C)?

A: Extended low-temperature operation (-65°C) is a design improvement in newer manufacturing processes. Substitutes with -65°C minimum temperature are backward compatible with applications requiring only -55°C operation and provide additional margin for extreme environment applications.

Q: Are onsemi BZX84C4V7LT1G and BZX84C4V7LT3G electrically identical?

A: Yes. Both parts are electrically identical with 4.7 V Zener voltage, ±6% tolerance, 225 mW power rating, and identical electrical characteristics. The difference is packaging format: LT1G uses Cut Tape & Digi-Reel, while LT3G uses Tape & Reel. Selection depends on assembly process requirements.

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