BZX55F4V7-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F4V7-TAP is a Zener diode rated at 4.7 V nominal voltage with 500 mW power dissipation and ±1% tolerance, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, though 680 pieces remain in stock as new original inventory. The part is qualified to AEC-Q101 automotive standards and housed in a DO-35 (DO-204AH) axial through-hole package.

Due to the obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Substitute parts must maintain the same nominal Zener voltage (4.7 V), power rating (500 mW), and through-hole mounting configuration while accommodating tolerance and impedance variations within acceptable design margins.

Key Parameters

Parameter	BZX55F4V7-TAP	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±1%	%
Power - Max	500	mW
Impedance (Max)	60	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 1 V	nA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the BZX55F4V7-TAP is based on the following critical parameters:

Primary Matching Criteria:

Nominal Zener voltage: 4.7 V (exact match required)
Power rating: 500 mW (equal or greater acceptable)
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting type: Through-hole

Secondary Compatibility Factors:

Tolerance: ±1% preferred; ±2% and ±5% acceptable with design verification
Impedance (Zzt): Variations permitted within circuit design margins
Reverse leakage current: Variations acceptable if within application requirements
Forward voltage: Minor variations acceptable
Operating temperature range: Extended ranges provide additional design margin

Compliance Considerations:

RoHS3 compliance preferred for new designs
AEC-Q101 qualification preferred for automotive applications
REACH compliance status consistent across all substitutes

Substitute parts are grouped into two categories: direct equivalents (matching tolerance and impedance characteristics) and functional equivalents (matching voltage and power rating with tolerance or impedance variations).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	RoHS
BZX55F4V7-TAP	Vishay	4.7	±1%	500	60	DO-35	Obsolete	ROHS3
BZX55B4V7-TAP	Vishay	4.7	±2%	500	80	DO-35	Active	ROHS3
1N5230B TR PBFREE	Central Semiconductor	4.7	±5%	500	19	DO-35	Active	ROHS3
1N5230BTR	Fairchild Semiconductor	4.7	±5%	500	19	DO-35	Active	—
1N5230BDO35	Microsemi	4.7	±5%	500	19	DO-35	Active	ROHS3
1N5230B	Microchip Technology	4.7	±5%	500	19	DO-35	Active	Non-compliant
1N5728B	Microchip Technology	4.7	±5%	500	70	DO-35	Active	Non-compliant
1N5728D	Microchip Technology	4.7	±1%	500	70	DO-35	Active	Non-compliant
1N5992B	Microchip Technology	4.7	±5%	500	70	DO-35	Active	Non-compliant
1N4624 TR PBFREE	Central Semiconductor	4.7	±5%	250	1550	DO-35	Active	—
1N4624-1	Microchip Technology	4.7	±5%	500	1550	DO-7	Active	Non-compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred):

BZX55B4V7-TAP is the primary direct replacement. Manufactured by the same supplier (Vishay General Semiconductor - Diodes Division), this part maintains the same base product series (BZX55), identical nominal voltage (4.7 V), identical power rating (500 mW), and identical package configuration (DO-35). The tolerance increases from ±1% to ±2%, and impedance increases from 60 Ohms to 80 Ohms. The part is active, ROHS3 compliant, and AEC-Q101 qualified. Operating temperature range extends to -65°C, providing additional design margin.

Tier 2 - Functional Equivalents (Active Status, RoHS3 Compliant):

1N5230B TR PBFREE (Central Semiconductor) and 1N5230BDO35 (Microsemi) are functionally equivalent substitutes. Both maintain 4.7 V nominal voltage, 500 mW power rating, and DO-35 package configuration. Tolerance increases to ±5%, and impedance decreases to 19 Ohms. Both parts are active and ROHS3 compliant. Operating temperature extends to -65°C to 200°C (Central Semiconductor) or -65°C to 175°C (Microsemi).

1N5230BTR (Fairchild Semiconductor) provides identical electrical specifications to the above parts with 4.7 V, 500 mW, ±5% tolerance, and 19 Ohms impedance in DO-35 package. This part is active with extended operating temperature range (-65°C to 200°C). RoHS status is not specified in the provided data.

Tier 3 - Functional Equivalents (Active Status, RoHS Non-Compliant):

1N5728B, 1N5728D, and 1N5992B (all Microchip Technology) maintain 4.7 V nominal voltage, 500 mW power rating, and DO-35 package. 1N5728D matches the original ±1% tolerance; 1N5728B and 1N5992B operate at ±5% tolerance. Impedance is 70 Ohms. All three parts are active but RoHS non-compliant. Operating temperature range is -65°C to 175°C.

1N5230B (Microchip Technology) provides 4.7 V, 500 mW, ±5% tolerance, and 19 Ohms impedance in DO-35 package. This part is active but RoHS non-compliant.

Tier 4 - Limited Substitutes (Power Rating Reduction or Package Variation):

1N4624 TR PBFREE (Central Semiconductor) reduces power rating to 250 mW with significantly higher impedance (1550 Ohms). This part is suitable only for applications with reduced power dissipation requirements.

1N4624-1 (Microchip Technology) maintains 500 mW power rating but uses DO-7 package instead of DO-35, requiring mechanical redesign. Impedance is 1550 Ohms. This part is RoHS non-compliant.

Compliance and Certification Considerations:

For new designs and applications requiring regulatory compliance, BZX55B4V7-TAP, 1N5230B TR PBFREE, or 1N5230BDO35 are recommended. These parts maintain ROHS3 compliance and active product status. For automotive applications requiring AEC-Q101 qualification, BZX55B4V7-TAP is the preferred choice.

Frequently Asked Questions (FAQ)

Q: Can BZX55B4V7-TAP directly replace BZX55F4V7-TAP without circuit modification?

A: BZX55B4V7-TAP is the direct replacement from the same manufacturer and product series. The tolerance change from ±1% to ±2% and impedance increase from 60 Ohms to 80 Ohms are within acceptable substitution parameters for most applications. Circuit verification is required only if the original design depends on the tighter ±1% tolerance specification.

Q: What is the difference between 1N5230B and 1N5230B TR PBFREE?

A: Both parts have identical electrical specifications (4.7 V, 500 mW, ±5% tolerance, 19 Ohms impedance, DO-35 package). The "TR PBFREE" designation indicates lead-free, tape-reel packaging from Central Semiconductor. The standard 1N5230B from Microchip Technology is available in bulk packaging and is RoHS non-compliant. The Central Semiconductor version is ROHS3 compliant.

Q: Why do some substitutes have significantly different impedance values?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at the nominal current. Variations in impedance reflect differences in semiconductor design and manufacturing processes between manufacturers. Lower impedance (19 Ohms) provides better voltage regulation; higher impedance (70 Ohms or 1550 Ohms) may affect circuit performance in applications requiring tight voltage regulation. Circuit analysis is required if impedance variation exceeds design tolerances.

Q: Can I use 1N4624-1 as a substitute if I modify the circuit board layout?

A: 1N4624-1 uses DO-7 package instead of DO-35, requiring mechanical redesign of the circuit board. Additionally, impedance is 1550 Ohms, significantly higher than the original 60 Ohms, which may degrade voltage regulation performance. This substitution is not recommended without comprehensive circuit re-analysis and board redesign.

Q: Is the 250 mW 1N4624 TR PBFREE suitable for my application?

A: 1N4624 TR PBFREE is suitable only if your application requires less than 250 mW power dissipation. The original BZX55F4V7-TAP is rated for 500 mW. Using a 250 mW part in a 500 mW application will result in component failure due to thermal stress. Verify actual power dissipation requirements before selecting this part.

Q: What is the impact of tolerance differences (±1%, ±2%, ±5%) on circuit performance?

A: Tolerance specifies the accuracy of the nominal Zener voltage. A ±1% tolerance on 4.7 V allows voltage variation between 4.653 V and 4.747 V. A ±5% tolerance allows variation between 4.465 V and 4.935 V. Applications requiring precise voltage regulation (such as reference circuits) depend on tighter tolerance. Applications with wider voltage acceptance bands tolerate ±5% parts. Circuit design specifications determine acceptable tolerance levels.

Q: Are all substitute parts automotive-grade?

A: No. Only BZX55B4V7-TAP carries automotive grade designation with AEC-Q101 qualification. Other substitutes are industrial-grade components. Automotive applications requiring AEC-Q101 qualification must use BZX55B4V7-TAP or verify alternative parts against specific automotive standards.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European environmental regulations restricting lead, cadmium, mercury, and other hazardous substances. ROHS3-compliant parts are required for products sold in the European Union and many other markets. RoHS non-compliant parts may face regulatory restrictions in certain regions.

Q: Can I mix different substitute parts in the same circuit board?

A: Mixing different Zener diode manufacturers and part numbers in the same circuit is not recommended unless circuit analysis confirms that impedance and tolerance variations do not affect overall circuit performance. Consistency in component selection ensures predictable voltage regulation and circuit behavior.

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