BZD27C51P R3G Equivalent & Substitute Parts

Part Overview

The BZD27C51P R3G is a 51 V, 1 W Zener diode manufactured by Taiwan Semiconductor Corporation in a Surface Mount Sub SMA package (DO-219AB). This component is classified as Active and maintains full production status. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for voltage regulation and protection applications requiring 51 V nominal Zener voltage.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging configurations are required, or when design specifications allow for compatible alternatives from different manufacturers or product lines. This reference provides engineering-validated substitutes based on electrical and mechanical parameter compatibility.

Substiute Parts

BZD27C51P R3G

Taiwan Semiconductor CorporationIn Stock: 902BZD27C51P R3G Datasheet

Current PartRFQ

BZD27C51P

Taiwan Semiconductor CorporationIn Stock: 4357BZD27C51P Datasheet

Parametric EquivalentRFQ

BZD27C51P-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 16342BZD27C51P-E3-08 Datasheet

SimilarRFQ

BZD27C51P-HE3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 3269BZD27C51P-HE3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZD27C51P R3G is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Zener (Nom): 51 V (exact match required)
• Package / Case: DO-219AB (mechanical and thermal compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Impedance (Max): 60 Ohms (electrical performance)
• Current - Reverse Leakage @ Vr: 1 µA @ 39 V (leakage characteristics)
• Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA (forward conduction)
• RoHS Status: ROHS3 Compliant (regulatory requirement)

Secondary Consideration:

• Power - Max: Substitutes with 800 mW (0.8 W) are acceptable as they operate within the thermal envelope of the 1 W specification
• Tolerance: Variations from ±5.88% to ±5% are acceptable within the Zener voltage specification range
• Operating Temperature: Extended range (-65°C to 175°C) provides enhanced thermal margin

Substitutes are grouped into two categories: parametric equivalents from the same manufacturer and similar parts from alternative manufacturers that meet all critical electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

BZD27C51P (Taiwan Semiconductor Corporation)

This part is a parametric equivalent with identical electrical specifications and operating temperature range. However, it carries a "Not For New Designs" product status designation. Selection of this substitute is appropriate only for legacy system maintenance, repair, or continuation of existing production runs where design changes are not feasible. For new design implementations, alternative active-status parts are preferred.

BZD27C51P-E3-08 (Vishay General Semiconductor - Diodes Division)

This substitute maintains Active product status and meets all critical electrical parameters. The maximum power rating of 800 mW is lower than the main part's 1 W specification; however, this reduction is acceptable for applications where the thermal load does not exceed 800 mW continuous dissipation. The extended operating temperature range (-65°C to 175°C) provides additional thermal margin. This part is suitable for general industrial and commercial applications requiring 51 V Zener regulation.

BZD27C51P-HE3-08 (Vishay General Semiconductor - Diodes Division)

This substitute is identical to BZD27C51P-E3-08 in electrical and mechanical specifications but includes automotive-grade qualification (AEC-Q101). Selection of this part is mandatory for automotive applications, safety-critical systems, or designs requiring AEC-Q101 certification. The automotive qualification ensures compliance with automotive industry reliability and quality standards.

All three substitutes are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity), ensuring compatibility with standard surface mount assembly processes and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can BZD27C51P-E3-08 or BZD27C51P-HE3-08 replace BZD27C51P R3G in existing designs?

A: Yes, both Vishay parts are electrically and mechanically compatible. The 51 V Zener voltage, 60 Ohm impedance, reverse leakage characteristics, and forward voltage specifications are identical. The DO-219AB package ensures mechanical fit and thermal performance. The 800 mW power rating is acceptable for applications where continuous dissipation does not exceed this threshold. Verify that your circuit design does not require the full 1 W power capability.

Q: What is the difference between BZD27C51P-E3-08 and BZD27C51P-HE3-08?

A: Both parts are electrically and mechanically identical. The primary difference is that BZD27C51P-HE3-08 carries automotive-grade qualification (AEC-Q101), making it suitable for automotive and safety-critical applications. BZD27C51P-E3-08 is intended for general industrial and commercial use. Select BZD27C51P-HE3-08 if your application requires automotive certification or operates in automotive environments.

Q: Why is BZD27C51P marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that Taiwan Semiconductor Corporation is transitioning this part number out of active production. While existing inventory remains available for legacy support and repairs, new design implementations should utilize active-status alternatives such as the Vishay BZD27C51P-E3-08 or BZD27C51P-HE3-08 to ensure long-term supply continuity and manufacturer support.

Q: Is the 800 mW power rating of the Vishay substitutes sufficient?

A: The 800 mW rating is sufficient for applications where the Zener diode operates within this power envelope. If your circuit design requires continuous dissipation exceeding 800 mW, the main part BZD27C51P R3G with its 1 W rating is necessary. Calculate the expected power dissipation using the formula: P = Vz × Iz, where Vz is the Zener voltage and Iz is the Zener current. If calculated power exceeds 800 mW, use the 1 W rated part.

Q: Are all substitutes compatible with the DO-219AB package footprint?

A: Yes. All listed substitutes use the DO-219AB (Sub SMA) package, ensuring identical mechanical fit, PCB footprint compatibility, and thermal characteristics. No layout or assembly process modifications are required when substituting between these parts.

Q: What compliance certifications apply to these parts?

A: All parts are RoHS3 compliant and REACH unaffected. BZD27C51P-HE3-08 additionally carries AEC-Q101 automotive qualification. All parts have MSL 1 (unlimited moisture sensitivity), allowing standard surface mount assembly without special moisture control measures.

Q: Can I use BZD27C51P R3G in automotive applications?

A: The BZD27C51P R3G does not carry automotive-grade qualification. For automotive applications, use BZD27C51P-HE3-08, which includes AEC-Q101 certification and meets automotive industry reliability standards.