1N4730AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4730AW-TP is a 3.9 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications across the operating temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Tolerance	±5%	—
Power - Maximum	1	W
Impedance (Maximum)	9	Ohms
Current - Reverse Leakage @ Vr	50	µA @ 1 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1N4730AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.9 V nominal
Package type: SOD-123 surface mount
Operating temperature range: -55°C to 150°C minimum
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (1 W primary; 410 mW to 500 mW acceptable for reduced power applications)
Voltage tolerance (±5% primary; ±2% acceptable for tighter regulation)
Impedance characteristics (9 Ohms primary; variations acceptable within functional requirements)

Substitute parts are grouped into two categories based on power rating: full 1 W equivalents and reduced-power alternatives (410 mW to 500 mW). All listed substitutes maintain the 3.9 V zener voltage specification and SOD-123 package format. Active product status is prioritized for long-term availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (W/mW)	Zzt (Ohms)	Temp Range (°C)	Status
1N4730AW-TP	Micro Commercial Co	3.9	±5%	1 W	9	-55 to 150	Obsolete
BZT52B3V9-E3-08	Vishay General Semiconductor	3.9	±2%	410 mW	90	-55 to 150	Active
BZT52B3V9-E3-18	Vishay General Semiconductor	3.9	±2%	410 mW	90	-55 to 150	Active
BZT52B3V9-G3-08	Vishay General Semiconductor	3.9	±2%	410 mW	90	-55 to 150	Active
BZT52B3V9-G3-18	Vishay General Semiconductor	3.9	±2%	410 mW	90	-55 to 150	Active
BZT52C3V9-7-F	Diodes Incorporated	3.9	±5%	500 mW	90	-65 to 150	Active
BZT52C3V9-E3-18	Vishay General Semiconductor	3.9	±5%	410 mW	95	-55 to 150	Active
BZT52C3V9-G3-08	Vishay General Semiconductor	3.9	±5%	410 mW	95	-55 to 150	Active
BZT52C3V9-G3-18	Vishay General Semiconductor	3.9	±5%	410 mW	95	-55 to 150	Active
CMHZ5228B TR PBFREE	Central Semiconductor Corp	3.9	±5%	500 mW	23	-65 to 150	Active
DDZ9686-7	Diodes Incorporated	3.9	±5%	500 mW	—	-65 to 150	Active

Engineering Selection Recommendations

For Direct 1 W Power Rating Replacement: No active substitute parts with 1 W power rating are available in the provided dataset. The 1N4730AW-TP represents a higher power class than current active production alternatives.

For Reduced Power Applications (410 mW to 500 mW):

Vishay BZT52 Series (±2% Tolerance): The BZT52B3V9 variants (E3-08, E3-18, G3-08, G3-18) provide tighter voltage tolerance at ±2% with 410 mW power rating. These parts are active products with established supply chains. Selection between E3 and G3 variants depends on packaging reel specifications. The -08 and -18 designations indicate different reel configurations.

Vishay BZT52C Series (±5% Tolerance): The BZT52C3V9 variants (E3-18, G3-08, G3-18, 7-F) maintain ±5% tolerance matching the original part specification. The 7-F variant offers 500 mW power rating with extended temperature range (-65°C to 150°C). These parts are active with consistent availability.

Alternative Manufacturers:

Central Semiconductor CMHZ5228B TR PBFREE provides 500 mW power rating with ±5% tolerance and superior impedance characteristics (23 Ohms). Operating temperature extends to -65°C.

Diodes Incorporated BZT52C3V9-7-F and DDZ9686-7 both offer 500 mW power rating with -65°C lower temperature limit, providing enhanced thermal margin.

Compliance Status: All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with existing manufacturing processes and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 410 mW zener diode as a direct replacement for the 1 W 1N4730AW-TP?

A: Substitution is possible only if circuit power dissipation requirements do not exceed 410 mW. The 1N4730AW-TP is rated for 1 W continuous dissipation. Applications requiring full 1 W capability require parts with equivalent power ratings. Reduced-power substitutes are suitable for circuits with lower dissipation demands.

Q: What is the difference between BZT52B and BZT52C series?

A: The primary difference is voltage tolerance. BZT52B series maintains ±2% tolerance, while BZT52C series maintains ±5% tolerance. The 1N4730AW-TP specifies ±5% tolerance, making BZT52C series electrically equivalent in this parameter. BZT52B series provides tighter regulation for applications requiring improved voltage stability.

Q: Are E3-08, E3-18, G3-08, and G3-18 package designations interchangeable?

A: These designations indicate different reel configurations and tape specifications for automated assembly. The electrical characteristics are identical. Selection depends on equipment compatibility and procurement specifications. Consult assembly equipment documentation for reel format requirements.

Q: Why do some substitutes have lower impedance values?

A: Impedance variation reflects manufacturing differences between suppliers. Lower impedance (23 Ohms for CMHZ5228B versus 9-95 Ohms for alternatives) indicates improved dynamic response characteristics. This does not affect basic zener regulation function but may improve transient response in specific circuit topologies.

Q: Can I use parts with -65°C lower temperature limit instead of -55°C?

A: Yes. Parts specified for -65°C to 150°C operation encompass the -55°C to 150°C requirement of the original part. Extended lower temperature range provides additional thermal margin without compromising compatibility.

Q: What is the significance of "PBFREE" designation in CMHZ5228B TR PBFREE?

A: PBFREE indicates lead-free construction, confirming ROHS3 compliance. This matches the original part's environmental compliance status and is standard for current production components.

Q: How do I select between multiple active substitutes?

A: Selection criteria include: (1) power rating requirement (410 mW or 500 mW), (2) voltage tolerance requirement (±2% or ±5%), (3) packaging reel format (E3 or G3 variants), (4) inventory availability, and (5) supplier preference. All listed parts maintain SOD-123 package format and required operating temperature range.

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