Equivalent & Substitute Parts for 1N4743AW-TP Zener Diode

Part Overview

The 1N4743AW-TP is a 13 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production requirements. The 1N4743AW-TP provides voltage regulation and transient protection in electronic circuits with its nominal zener voltage of 13 V and ±5% tolerance specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	-
Power - Max	1	W
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 9.9 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N4743AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 13 V (exact match required)
Mounting Type: Surface Mount
Package / Case: SOD-123 or SOD-123F compatible footprints
Operating Temperature Range: Minimum -55°C to 150°C coverage
RoHS3 Compliance: Required for regulatory alignment

Secondary Compatibility Factors:

Power - Max: 1 W or greater (higher power ratings are acceptable)
Tolerance: ±5% or tighter (±2% is acceptable)
Impedance (Max): 10 Ohms or lower (lower impedance acceptable)

Substitute parts are grouped into two categories: direct equivalents with matching power ratings and similar alternatives with reduced power dissipation that maintain electrical functionality within the specified operating parameters.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W/mW)	Zzt (Ohms)	Package	Status
1N4743AW-TP	Micro Commercial Co	13	±5%	1 W	10	SOD-123	Obsolete
DFLZ13-TP	Micro Commercial Co	13	±5%	1 W	10	SOD-123F	Active
BZT52B13-E3-08	Vishay General Semiconductor	13	±2%	410 mW	25	SOD-123	Active
BZT52B13-E3-18	Vishay General Semiconductor	13	±2%	410 mW	25	SOD-123	Active
BZT52B13-G3-08	Vishay General Semiconductor	13	±2%	410 mW	25	SOD-123	Active
BZT52B13-G3-18	Vishay General Semiconductor	13	±2%	410 mW	25	SOD-123	Active
BZT52C13-7-F	Diodes Incorporated	13	±6.42%	500 mW	30	SOD-123	Active
BZT52C13-E3-08	Vishay General Semiconductor	13	±5%	410 mW	25	SOD-123	Active
BZT52C13-E3-18	Vishay General Semiconductor	13	±5%	410 mW	25	SOD-123	Active
BZT52C13-G3-08	Vishay General Semiconductor	13	±5%	410 mW	25	SOD-123	Active
BZT52C13-G3-18	Vishay General Semiconductor	13	±5%	410 mW	25	SOD-123	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

DFLZ13-TP from Micro Commercial Co is the direct equivalent replacement for 1N4743AW-TP. This part maintains identical electrical specifications (13 V, 1 W, ±5% tolerance) and operating temperature range (-55°C to 150°C). The primary difference is the package variant (SOD-123F versus SOD-123), which is mechanically compatible with standard SOD-123 footprints. DFLZ13-TP carries Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Alternative Substitutes (Lower Power Rating):

The BZT52 series from Vishay General Semiconductor and BZT52C13-7-F from Diodes Incorporated provide functional substitution with reduced power dissipation (410 mW to 500 mW). These parts are suitable for applications where the full 1 W power rating is not required. Selection among BZT52B13, BZT52C13, and BZT52C13-7-F variants depends on tolerance requirements and packaging preferences:

BZT52B13 series (±2% tolerance): Tighter voltage tolerance than the original part
BZT52C13 series (±5% tolerance): Matches original tolerance specification
BZT52C13-7-F (±6.42% tolerance): Slightly wider tolerance, highest inventory availability

All substitute parts maintain 13 V nominal zener voltage, SOD-123 package compatibility, surface mount configuration, and ROHS3 compliance. Operating temperature ranges meet or exceed the original specification.

Frequently Asked Questions (FAQ)

Q: Can BZT52B13-G3-08 replace 1N4743AW-TP in all applications?

A: BZT52B13-G3-08 is electrically compatible for applications where power dissipation does not exceed 410 mW. The part maintains 13 V zener voltage and SOD-123 package compatibility. However, applications requiring the full 1 W power rating must use DFLZ13-TP or equivalent 1 W rated alternatives.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of SOD-123 with identical electrical performance and footprint compatibility. Both packages are surface mount configurations suitable for automated assembly. DFLZ13-TP uses SOD-123F packaging while maintaining full compatibility with 1N4743AW-TP circuit applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the regulatory status of the original 1N4743AW-TP component.

Q: Why do some substitutes have ±2% tolerance instead of ±5%?

A: BZT52B13 series components feature tighter ±2% tolerance specifications compared to the original ±5% tolerance. Tighter tolerance provides improved voltage regulation accuracy and is acceptable for applications requiring the original ±5% specification. Selection of tighter tolerance variants does not create compatibility issues.

Q: What is the significance of the -E3, -G3, -08, and -18 designations in part numbers?

A: These designations indicate manufacturing date codes and tape reel configurations. -E3 and -G3 represent different manufacturing periods. -08 and -18 indicate different tape reel specifications. All variants with identical base part numbers (BZT52B13, BZT52C13) share identical electrical specifications and are interchangeable from a functional perspective.

Q: Can BZT52C13-7-F be used as a direct replacement?

A: BZT52C13-7-F is functionally compatible with 13 V zener voltage and SOD-123 package. However, its 500 mW power rating is lower than the original 1 W specification. Use this part only in applications where power dissipation remains below 500 mW. The ±6.42% tolerance is wider than the original ±5% specification.

Q: Is DFLZ13-TP the only true equivalent?

A: DFLZ13-TP is the only substitute maintaining identical 1 W power rating and ±5% tolerance. It is the recommended primary replacement for direct substitution without circuit re-evaluation. Other listed parts are functional alternatives suitable for specific application requirements.

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