BZD17C18P RVG Equivalent & Substitute Parts

Part Overview

The BZD17C18P RVG is an 18 V, 800 mW Zener diode manufactured by Taiwan Semiconductor Corporation in Sub SMA surface mount packaging. This component is classified as Active and maintains full RoHS3 compliance. The device operates across a temperature range of -55°C to 175°C and is designed for voltage regulation and protection applications in electronic circuits. Substitute parts are identified based on matching electrical specifications including nominal Zener voltage, power dissipation capability, impedance characteristics, and thermal operating range, while accommodating variations in package form factors and manufacturer sourcing requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Power - Max	800	mW
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 13 V
Voltage - Forward (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZD17C18P RVG is determined by electrical parameter equivalence across the following criteria:

Primary Electrical Matching Parameters:

Nominal Zener voltage: 18 V
Maximum power dissipation: 800 mW or greater
Maximum impedance: 15 Ohms
Reverse leakage current: 1 µA @ 13 V
Forward voltage: 1.2 V @ 200 mA or lower
Operating temperature range: -55°C to 175°C minimum

Secondary Compatibility Factors:

Surface mount mounting type
RoHS3 compliance
Moisture sensitivity level MSL 1 (Unlimited)
REACH unaffected status

Substitute parts are grouped into two categories: MFR Recommended (higher power rating, alternative package) and Similar (equivalent power rating, same package form factor, alternative manufacturer or automotive qualification).

Parameter Comparison

Parameter	BZD17C18P RVG (Main)	BZD27C18PW (MFR Recommended)	BZD27C18P-E3-08 (Similar)	BZD27C18P-HE3-08 (Similar)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	18 V	18 V	18 V	18 V
Tolerance	±6.38%	±6.4%	—	—
Power - Max	800 mW	1 W	800 mW	800 mW
Impedance (Max)	15 Ohms	15 Ohms	15 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 13 V	1 µA @ 13 V	1 µA @ 13 V	1 µA @ 13 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-219AB (Sub SMA)	SOD-123W	DO-219AB (SMF)	DO-219AB (SMF)
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101

Engineering Selection Recommendations

BZD27C18PW (MFR Recommended Substitute)

This part is the manufacturer-recommended substitute and offers increased power dissipation capability at 1 W compared to the original 800 mW specification. The BZD27C18PW maintains identical nominal Zener voltage, impedance, and reverse leakage characteristics. The primary trade-off is a package change from Sub SMA (DO-219AB) to SOD-123W, which requires PCB layout modification. Forward voltage is improved at 1 V versus 1.2 V. This substitute is suitable for applications where higher thermal margin is required or where SOD-123W footprints are already established in the design. All compliance certifications (RoHS3, REACH unaffected, MSL 1) are maintained.

BZD27C18P-E3-08 (Similar Substitute - Standard Grade)

This Vishay part maintains the original DO-219AB package form factor, eliminating layout redesign requirements. Electrical specifications are identical to the main part across all critical parameters. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. This substitute is appropriate for direct replacement in existing designs where package compatibility is prioritized. RoHS3 compliance and MSL 1 rating are maintained.

BZD27C18P-HE3-08 (Similar Substitute - Automotive Grade)

This Vishay part is qualified to AEC-Q101 automotive standards and maintains the DO-219AB package form factor. Electrical specifications match the main part identically. Operating temperature range extends to -65°C. This substitute is specified for automotive applications requiring formal automotive qualification documentation. All compliance certifications are maintained.

Frequently Asked Questions (FAQ)

Q: Can BZD27C18PW be used as a direct replacement for BZD17C18P RVG?

A: BZD27C18PW is electrically compatible as a substitute but requires PCB layout modification due to package change from Sub SMA (DO-219AB) to SOD-123W. The increased power rating (1 W vs. 800 mW) and improved forward voltage (1 V vs. 1.2 V) are compatible with the original application. Thermal management and board space must be re-evaluated for the new package footprint.

Q: What is the difference between BZD27C18P-E3-08 and BZD27C18P-HE3-08?

A: Both parts are manufactured by Vishay and maintain identical electrical specifications and the DO-219AB package. The primary distinction is that BZD27C18P-HE3-08 carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring formal qualification documentation. BZD27C18P-E3-08 is the standard industrial-grade equivalent.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (BZD27C18PW, BZD27C18P-E3-08, and BZD27C18P-HE3-08) maintain ROHS3 compliance status identical to the main part BZD17C18P RVG.

Q: Can I use a substitute part with a lower power rating?

A: No. Substitute parts must maintain power dissipation capability equal to or greater than the original 800 mW specification. BZD27C18PW at 1 W and both Vishay parts at 800 mW meet this requirement. Parts with lower power ratings are not acceptable substitutes.

Q: Does the operating temperature range affect substitution compatibility?

A: The main part operates from -55°C to 175°C. Both Vishay substitute parts extend the lower temperature limit to -65°C, which is compatible with the original specification and provides additional margin. This extended range does not prevent substitution; it enhances performance in low-temperature environments.

Q: What packaging considerations apply when selecting a substitute?

A: The main part uses Sub SMA (DO-219AB) packaging. BZD27C18P-E3-08 and BZD27C18P-HE3-08 maintain this package, allowing direct PCB footprint compatibility. BZD27C18PW uses SOD-123W packaging, which requires new PCB layout and assembly process validation. Package selection depends on whether existing board designs can be modified or must remain unchanged.

Q: Are moisture sensitivity levels equivalent across all parts?

A: Yes. The main part and all substitute parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

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