1N4755AW-TP Zener Diode 43V 1W Equivalent & Substitute Parts

Part Overview

The 1N4755AW-TP is a 43 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 parts necessary for ongoing design support and procurement. The 1N4755AW-TP operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	43 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	70 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 32.7 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-55°C ~ 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 1N4755AW-TP is determined by the following critical parameters: nominal zener voltage (43 V), package type (SOD-123 or compatible variants), mounting method (surface mount), and operating temperature range (-55°C to 150°C minimum). The substitute parts are grouped into two categories based on power dissipation capability:

Category 1: Direct Power Rating Match (1 W) The DFLZ43-TP maintains the full 1 W power rating of the original part while offering active product status. This part uses the SOD-123F package variant, which is mechanically and electrically compatible with SOD-123 applications.

Category 2: Reduced Power Rating (410 mW) The BZT52 series parts (BZT52B43 and BZT52C43 variants) operate at 410 mW maximum power dissipation. These parts maintain the 43 V zener voltage, SOD-123 package, surface mount configuration, and -55°C to 150°C operating temperature range. Voltage tolerance varies across variants (±2%, ±5%, or ±7%), and impedance specifications differ slightly (97 Ohms vs. 70 Ohms).

All substitute parts are ROHS3 compliant with MSL 1 rating and active product status, except where noted.

Parameter Comparison

Parameter	1N4755AW-TP	DFLZ43-TP	BZT52B43-E3-08	BZT52B43-E3-18	BZT52B43-G3-08	BZT52B43-G3-18	BZT52C43-7-F	BZT52C43-E3-08	BZT52C43-E3-18	BZT52C43-G3-08	BZT52C43-G3-18
Voltage - Zener (Nom)	43 V	43 V	43 V	43 V	43 V	43 V	43 V	43 V	43 V	43 V	43 V
Power - Max	1 W	1 W	410 mW	410 mW	410 mW	410 mW	410 mW	410 mW	410 mW	410 mW	410 mW
Tolerance	±5%	±5%	±2%	±2%	±2%	±2%	±7%	±5%	±5%	±5%	±5%
Impedance (Max)	70 Ohms	70 Ohms	97 Ohms	97 Ohms	97 Ohms	97 Ohms	100 Ohms	97 Ohms	97 Ohms	97 Ohms	97 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 32.7 V	5 µA @ 32.7 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V	100 nA @ 32 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C (TJ)	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123F	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement with Maintained Power Rating: The DFLZ43-TP is the primary substitute for the 1N4755AW-TP. Both parts maintain 1 W power dissipation, ±5% voltage tolerance, 70 Ohms impedance, and identical operating temperature range. The DFLZ43-TP uses SOD-123F package, which is mechanically compatible with SOD-123 footprints. The DFLZ43-TP carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance.

For Reduced Power Applications: Applications requiring less than 410 mW power dissipation can utilize BZT52 series parts. The BZT52B43 variants (±2% tolerance) and BZT52C43 variants (±5% or ±7% tolerance) all maintain 43 V zener voltage and SOD-123 package compatibility. BZT52C43-E3-08 and BZT52C43-E3-18 match the original ±5% tolerance specification. All BZT52 variants are active products with ROHS3 compliance and MSL 1 rating.

Compliance and Availability: All substitute parts listed are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental specifications. All substitutes except the obsolete 1N4755AW-TP maintain active product status, ensuring continued procurement availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the DFLZ43-TP directly replace the 1N4755AW-TP in existing designs? A: Yes. The DFLZ43-TP maintains identical electrical specifications (43 V, 1 W, ±5% tolerance, -55°C to 150°C) and uses the SOD-123F package, which is mechanically and electrically compatible with SOD-123 footprints. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the primary difference between the DFLZ43-TP and BZT52 series substitutes? A: The DFLZ43-TP maintains the original 1 W power rating, while BZT52 series parts are rated at 410 mW. The BZT52 series also exhibits lower reverse leakage current (100 nA vs. 5 µA) and slightly higher impedance (97-100 Ohms vs. 70 Ohms). BZT52 series parts are suitable for applications with lower power dissipation requirements.

Q: Are there tolerance differences among the BZT52 substitutes? A: Yes. BZT52B43 variants offer ±2% tolerance, BZT52C43-E3 variants offer ±5% tolerance, and BZT52C43-7-F offers ±7% tolerance. For applications requiring ±5% tolerance matching the original 1N4755AW-TP, select BZT52C43-E3-08 or BZT52C43-E3-18.

Q: What do the suffixes in part numbers (E3-08, E3-18, G3-08, G3-18) indicate? A: These suffixes denote packaging and tape configuration variants. E3 and G3 refer to different tape specifications for reel packaging. The -08 and -18 designations indicate different reel sizes or packaging configurations. All variants maintain identical electrical specifications for a given base part number.

Q: Can BZT52 series parts be used in applications originally designed for 1 W dissipation? A: BZT52 series parts are rated at 410 mW maximum power dissipation. They can be used only in applications where the actual power dissipation does not exceed 410 mW. Applications requiring sustained 1 W operation must use the DFLZ43-TP or equivalent 1 W rated parts.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original 1N4755AW-TP specification.

Q: What is the operating temperature range for BZT52C43-7-F compared to other substitutes? A: The BZT52C43-7-F operates from -65°C to 150°C, providing a lower temperature limit 10°C below the original part and other substitutes (-55°C to 150°C). This extended range is suitable for applications requiring enhanced low-temperature performance.

Q: How does reverse leakage current differ between the original and substitutes? A: The 1N4755AW-TP specifies 5 µA reverse leakage at 32.7 V. All BZT52 series substitutes specify 100 nA reverse leakage at 32 V, representing significantly lower leakage. The DFLZ43-TP maintains 5 µA leakage, matching the original specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message