BZD27C43P Zener Diode Equivalent & Substitute Parts

Part Overview

The BZD27C43P is a 43 V, 1 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in Sub SMA (DO-219AB) packaging. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The product is ROHS3 compliant with unlimited moisture sensitivity (MSL 1) and operates across the temperature range of -55°C to 175°C.

Due to its discontinued status, equivalent and substitute parts are necessary for ongoing maintenance, repair, and legacy system support. Substitute options include both direct functional equivalents and variants with enhanced specifications or automotive-grade qualifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	43	V
Tolerance	±5%	-
Power - Maximum	1	W
Impedance (Maximum)	45	Ohms
Current - Reverse Leakage @ 33 V	1	µA
Voltage - Forward (Maximum) @ 200 mA	1.2	V
Operating Temperature Range	-55 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	DO-219AB	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BZD27C43P is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 43 V nominal
Impedance (maximum): 45 Ohms
Reverse leakage current: 1 µA @ 33 V
Surface mount mounting type
ROHS3 compliance

Secondary Considerations:

Power rating: The main part specifies 1 W maximum. Substitute parts with 800 mW (0.8 W) power ratings remain functionally compatible for applications not requiring the full 1 W dissipation capability.
Package variants: DO-219AB (SMF) and SOD-123W packages are both surface mount options with compatible form factors for different PCB layouts.
Forward voltage: Variations between 1 V and 1.2 V @ 200 mA are within acceptable operating margins for zener diode applications.
Operating temperature: Extended range (-65°C to 175°C) in substitute parts provides enhanced thermal performance compared to the main part (-55°C to 175°C).

Substitute parts are grouped into two categories: the manufacturer-recommended active alternative (BZD27C43PW) and functionally equivalent variants from Vishay General Semiconductor with identical electrical specifications but different packaging, series designations, or automotive qualifications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Zzt (Ohms)	Vf @ 200mA (V)	Package	Status	Automotive Grade
BZD27C43P	Taiwan Semiconductor	43	1.0	45	1.2	DO-219AB	Not For New Designs	-
BZD27C43PW	Taiwan Semiconductor	43	1.0	45	1.0	SOD-123W	Active	-
BZD27C43P-E3-08	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-
BZD27C43P-E3-18	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-
BZD27C43P-HE3-08	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	AEC-Q101
BZD27C43P-HE3-18	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	AEC-Q101
BZD27C43P-M-08	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-
BZD27C43P-M-18	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-
BZD27C43P-M3-08	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-
BZD27C43P-M3-18	Vishay General Semiconductor	43	0.8	45	1.2	DO-219AB	Active	-

Engineering Selection Recommendations

Primary Recommendation: BZD27C43PW

The BZD27C43PW is the manufacturer-recommended substitute from Taiwan Semiconductor Corporation. This part maintains active product status and is suitable for new designs. It provides identical zener voltage (43 V), impedance (45 Ohms), and power rating (1 W) specifications. The primary difference is the package format (SOD-123W versus DO-219AB Sub SMA), which requires PCB layout adjustment but offers equivalent electrical performance. Forward voltage is improved at 1.0 V versus 1.2 V.

Secondary Recommendations: Vishay BZD27C43P Series

The Vishay General Semiconductor BZD27C43P variants (E3, HE3, M, M3 designations) are active products with identical zener voltage and impedance specifications. These parts operate at 800 mW power rating, which is suitable for applications where the full 1 W dissipation is not required. All variants maintain the DO-219AB package format, eliminating PCB layout changes.

Automotive Applications: BZD27C43P-HE3-08 and BZD27C43P-HE3-18

For automotive applications, the BZD27C43P-HE3-08 and BZD27C43P-HE3-18 variants carry AEC-Q101 qualification, indicating compliance with automotive reliability standards. These parts are recommended for automotive-grade circuit designs requiring enhanced temperature performance (-65°C to 175°C operating range).

Selection Criteria Summary:

Use BZD27C43PW for new designs requiring 1 W power rating with SOD-123W package compatibility
Use Vishay BZD27C43P-E3, M, or M3 variants for direct DO-219AB package replacement with 800 mW power rating
Use BZD27C43P-HE3 variants for automotive applications with AEC-Q101 certification
All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating

Frequently Asked Questions (FAQ)

Q: Can BZD27C43P be directly replaced with BZD27C43PW?

A: Yes, electrically. Both parts share identical zener voltage (43 V), impedance (45 Ohms), and power rating (1 W). The primary difference is the package format: BZD27C43PW uses SOD-123W while BZD27C43P uses DO-219AB (Sub SMA). PCB layout modifications are required to accommodate the different package footprint.

Q: Are the 800 mW Vishay variants suitable replacements for the 1 W BZD27C43P?

A: Yes, for applications where power dissipation does not exceed 800 mW. The Vishay BZD27C43P-E3, M, and M3 variants maintain all critical electrical parameters (zener voltage, impedance, reverse leakage). If the circuit design requires the full 1 W dissipation capability, the BZD27C43PW is the appropriate choice.

Q: What is the difference between BZD27C43P-E3, HE3, M, and M3 designations?

A: These designations represent different manufacturing series and packaging options within the Vishay product line. All variants share identical electrical specifications (43 V zener voltage, 800 mW power, 45 Ohms impedance). The HE3 variants include AEC-Q101 automotive qualification. The M and M3 designations indicate different manufacturing series. Selection should be based on application requirements (automotive versus general industrial) and packaging availability.

Q: Is the operating temperature range difference significant?

A: The main part BZD27C43P operates from -55°C to 175°C, while Vishay substitutes operate from -65°C to 175°C. The extended lower temperature limit in Vishay parts provides enhanced performance in cold environments. For applications operating above -55°C, both ranges are equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the environmental and regulatory status of the original BZD27C43P.

Q: Which substitute should be used for automotive applications?

A: The BZD27C43P-HE3-08 and BZD27C43P-HE3-18 variants are qualified to AEC-Q101 automotive standards. These parts are recommended for automotive circuit designs requiring compliance with automotive reliability and qualification requirements.

Q: Can multiple substitute parts be used interchangeably on the same PCB?

A: Parts with identical package formats (DO-219AB) can be used interchangeably: BZD27C43P-E3, HE3, M, and M3 variants. The BZD27C43PW (SOD-123W package) requires different PCB footprint and cannot be used interchangeably without layout modification. Verify power dissipation requirements before selecting 800 mW variants for 1 W applications.

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