BZX84C27 Equivalent & Substitute Parts

Part Overview

The BZX84C27 is a 27 V, 300 mW Zener diode manufactured by Taiwan Semiconductor Corporation in SOT-23 surface mount packaging. This small signal Zener diode is designed for voltage regulation and protection applications requiring precise voltage reference at 27 V nominal. The part is Active status and RoHS3 compliant, making it suitable for current production environments. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Power - Max	300	mW
Tolerance	±7.04%	%
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX84C27 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - Zener (Nom): 27 V
Power - Max: 300 mW
Impedance (Max): 80 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Operating Temperature Range: -65°C to 150°C (TJ)
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3

Tolerance Variation: Substitute parts may exhibit tolerance specifications ranging from ±2% to ±7.04%. All listed substitutes maintain the nominal 27 V Zener voltage within their specified tolerance bands.

Packaging Format: Substitute parts are available in Tape & Reel (TR) format, which is mechanically and electrically equivalent to the standard packaging of the main part.

Compliance & Certification: All substitute parts maintain RoHS3 compliance and REACH Unaffected status. Certain substitutes carry AEC-Q101 automotive qualification, which represents an additional qualification level beyond the base requirement.

Parameter Comparison

Parameter	BZX84C27	BZX84C27 RFG	BZX84B27Q-7-F	BZX84C27Q-13-F	BZX84C27Q-7-F
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V
Tolerance	±7.04%	±5%	±2%	±7.04%	±7.04%
Power - Max	300 mW	300 mW	300 mW	300 mW	300 mW
Impedance (Max)	80 Ohms	80 Ohms	80 Ohms	80 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C (TJ)	-65 to 150°C (TJ)	-65 to 150°C (TJ)	-65 to 150°C (TJ)	-65 to 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	—	—	Automotive	Automotive	Automotive
Qualification	—	—	AEC-Q101	AEC-Q101	AEC-Q101
Inventory Status	50100 Pcs New Original In Stock	6751 Pcs New Original In Stock	3110 Pcs New Original In Stock	662 Pcs New Original In Stock	24300 Pcs New Original In Stock

Engineering Selection Recommendations

BZX84C27 RFG (Taiwan Semiconductor Corporation)

This substitute maintains identical electrical specifications to the main part with improved tolerance (±5% versus ±7.04%). It is supplied in Tape & Reel format and carries RoHS3 compliance. Selection of this part is appropriate for applications where tighter tolerance control is beneficial and supply from the original manufacturer is preferred.

BZX84B27Q-7-F (Diodes Incorporated)

This substitute offers the tightest tolerance specification at ±2%, combined with AEC-Q101 automotive qualification. It is designated as Automotive grade and is suitable for applications requiring enhanced reliability and stricter voltage regulation. This part is appropriate for automotive and mission-critical applications where tolerance precision is a design requirement.

BZX84C27Q-13-F (Diodes Incorporated)

This substitute maintains the same tolerance as the main part (±7.04%) and carries AEC-Q101 automotive qualification. It is suitable for automotive applications where the original tolerance specification is acceptable but automotive-grade qualification is required. Inventory availability is limited.

BZX84C27Q-7-F (Diodes Incorporated)

This substitute maintains the same tolerance as the main part (±7.04%) and carries AEC-Q101 automotive qualification. It is suitable for automotive applications and offers the highest inventory availability among the Diodes Incorporated substitutes. This part is appropriate for high-volume production requiring automotive-qualified components.

Frequently Asked Questions (FAQ)

Q: Can BZX84C27 be directly replaced with BZX84C27 RFG?

A: Yes. Both parts share identical electrical parameters including 27 V nominal Zener voltage, 300 mW power rating, 80 Ohms maximum impedance, and -65°C to 150°C operating temperature range. The primary difference is packaging format (Tape & Reel) and improved tolerance specification (±5% versus ±7.04%). Both are RoHS3 compliant and surface mount compatible.

Q: What is the difference between BZX84C27Q-7-F and BZX84C27Q-13-F?

A: Both parts are manufactured by Diodes Incorporated and share identical electrical specifications including 27 V nominal voltage, 300 mW power, and ±7.04% tolerance. Both carry AEC-Q101 automotive qualification. The primary difference is inventory availability and internal reel configuration (indicated by the "7" and "13" designations). Electrical performance and package compatibility are equivalent.

Q: Is BZX84B27Q-7-F suitable for non-automotive applications?

A: Yes. BZX84B27Q-7-F meets all electrical requirements for the BZX84C27 application space. The AEC-Q101 automotive qualification and Automotive grade designation represent additional qualification levels that exceed standard requirements. This part is suitable for any application requiring a 27 V, 300 mW Zener diode in SOT-23 packaging, regardless of automotive use.

Q: Are all substitute parts available in SOT-23 packaging?

A: Yes. All substitute parts listed are packaged in TO-236-3, SC-59, SOT-23-3 configurations, which are mechanically and electrically equivalent. All parts are surface mount compatible and suitable for automated assembly processes.

Q: What is the significance of tolerance differences among substitute parts?

A: Tolerance specifications define the acceptable deviation from the nominal 27 V Zener voltage. BZX84B27Q-7-F offers ±2% tolerance (tightest control), BZX84C27 RFG offers ±5% tolerance, and BZX84C27, BZX84C27Q-13-F, and BZX84C27Q-7-F offer ±7.04% tolerance. Selection depends on circuit requirements for voltage regulation precision. Tighter tolerance parts are appropriate for applications requiring strict voltage reference accuracy.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: Can BZX84C27 be used in automotive applications?

A: The base BZX84C27 does not carry AEC-Q101 automotive qualification. For automotive applications requiring qualified components, BZX84B27Q-7-F, BZX84C27Q-13-F, or BZX84C27Q-7-F are appropriate substitutes, all of which carry AEC-Q101 qualification and Automotive grade designation.

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