BZX84C27-7 Equivalent & Substitute Parts

Part Overview

The BZX84C27-7 is a 27 V, 300 mW Zener diode manufactured by Diodes Incorporated in SOT-23-3 surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The device operates across a temperature range of -65°C to 150°C with ±7% voltage tolerance and is classified as RoHS non-compliant. Equivalent and substitute parts maintain the core electrical characteristics while offering improved availability, compliance status, or enhanced specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Power - Maximum	300	mW
Tolerance	±7%	—
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18.9 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—

Substitute Part Grouping Explanation

Substitution of the BZX84C27-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 27 V nominal
Package type: SOT-23-3 surface mount
Operating temperature range: -65°C to 150°C minimum
Forward voltage: 900 mV @ 10 mA maximum
Impedance: 80 Ohms maximum

Secondary Considerations:

Power dissipation: 300 mW (main part) to 225–250 mW (substitutes)
Voltage tolerance: ±7% (main part) to ±1% (improved alternatives)
Reverse leakage current: 100 nA @ 18.9 V (main part) to 50 nA @ 18.9 V (improved alternatives)
RoHS compliance and automotive qualification (AEC-Q101)

Substitute parts are grouped into three categories: direct equivalents (identical electrical specifications with improved packaging or compliance), parametric equivalents (tighter tolerance or lower power rating), and manufacturer-recommended alternatives (different manufacturers with equivalent or superior performance).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	RoHS Status	AEC-Q101
BZX84C27-7	Diodes Inc.	27	±7%	300	80	100 @ 18.9	900 @ 10	-65 to 150	Non-compliant	—
BZX84C27-7-F	Diodes Inc.	27	±7%	300	80	100 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	—
BZX84B27-7-F	Diodes Inc.	27	±2%	300	80	100 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	—
BZX84-A27,215	Nexperia USA	27	±1%	250	80	50 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	Yes
BZX84-C27,215	Nexperia USA	27	±5%	250	80	50 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	Yes
BZX84-C27,235	Nexperia USA	27	±5%	250	80	50 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	Yes
BZX84B27LT1G	Fairchild Semi.	27	±2%	250	80	50 @ 18.9	900 @ 10	-65 to 150	—	—
BZX84C27LT1G	onsemi	27	±7%	225	80	50 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	—
MMBZ5254BLT1G	onsemi	27	±5%	225	41	100 @ 21	900 @ 10	-65 to 150	ROHS3 Compliant	—
SZBZX84C27LT1G	onsemi	27	±7%	225	80	50 @ 18.9	900 @ 10	-65 to 150	ROHS3 Compliant	Yes
SZMMBZ5254BLT1G	onsemi	27	±5%	225	41	100 @ 21	900 @ 10	-65 to 150	ROHS3 Compliant	Yes

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

BZX84C27-7-F is the direct equivalent manufactured by Diodes Incorporated. It maintains identical electrical specifications (27 V, ±7%, 300 mW, 80 Ohms impedance) and packaging (SOT-23-3) while achieving ROHS3 compliance. This part is active and widely available (62,100 units in stock), making it the preferred replacement for the discontinued BZX84C27-7.

Parametric Equivalent with Enhanced Tolerance:

BZX84B27-7-F offers tighter voltage tolerance (±2% versus ±7%) while maintaining 300 mW power rating and identical impedance. This part is suitable for applications requiring improved voltage accuracy. ROHS3 compliance is achieved.

Automotive-Qualified Alternatives:

BZX84-A27,215 and BZX84-C27,215 (Nexperia USA) provide AEC-Q101 automotive qualification with ROHS3 compliance. These parts feature reduced power dissipation (250 mW) and lower reverse leakage current (50 nA @ 18.9 V). The ±1% tolerance variant (BZX84-A27,215) is suitable for precision applications.

Lower Power Alternatives:

BZX84C27LT1G, SZBZX84C27LT1G, MMBZ5254BLT1G, and SZMMBZ5254BLT1G operate at 225 mW power dissipation. These parts are suitable for applications where thermal management is a concern. SZBZX84C27LT1G and SZMMBZ5254BLT1G include AEC-Q101 qualification for automotive use.

Selection Criteria by Application:

General industrial replacement: BZX84C27-7-F
Precision voltage regulation: BZX84B27-7-F or BZX84-A27,215
Automotive applications: SZBZX84C27LT1G or SZMMBZ5254BLT1G
Thermal-constrained designs: BZX84C27LT1G or MMBZ5254BLT1G

Frequently Asked Questions (FAQ)

Q: Can BZX84C27-7-F be used as a direct replacement for BZX84C27-7?

A: Yes. BZX84C27-7-F is electrically and mechanically identical to BZX84C27-7, with the primary difference being ROHS3 compliance and active product status. Both parts share the same 27 V nominal voltage, ±7% tolerance, 300 mW power rating, 80 Ohms impedance, and SOT-23-3 packaging.

Q: What is the difference between BZX84B27-7-F and BZX84C27-7-F?

A: The primary difference is voltage tolerance. BZX84B27-7-F provides ±2% tolerance compared to ±7% for BZX84C27-7-F. Both maintain 300 mW power dissipation and 80 Ohms impedance. The tighter tolerance of the B-series part is beneficial for applications requiring more precise voltage regulation.

Q: Are lower power alternatives (225 mW) suitable replacements?

A: Lower power alternatives are suitable if the application does not require the full 300 mW dissipation capability. Parts such as BZX84C27LT1G and MMBZ5254BLT1G maintain the 27 V nominal voltage and SOT-23-3 package. Verify that the circuit design does not depend on the higher power rating before substitution.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Parts such as BZX84-A27,215, BZX84-C27,215, SZBZX84C27LT1G, and SZMMBZ5254BLT1G carry this certification, making them suitable for automotive applications where such qualification is required.

Q: Does impedance variation affect substitution?

A: Impedance is a secondary parameter. The main part and most substitutes specify 80 Ohms maximum impedance. MMBZ5254BLT1G and SZMMBZ5254BLT1G specify 41 Ohms impedance, which is lower and generally acceptable for most applications. Verify impedance requirements in high-frequency or precision circuits before substitution.

Q: What packaging options are available?

A: All substitute parts use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, identical to the main part. Packaging variations exist only in tape format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, or Bulk. These variations do not affect electrical performance or mechanical compatibility.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance requirements depend on application jurisdiction and customer specifications. The original BZX84C27-7 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, making them suitable for applications with RoHS requirements. Verify compliance requirements with your design specifications.

Q: Can MMBZ5254BLT1G be used despite different impedance and leakage specifications?

A: MMBZ5254BLT1G maintains the 27 V nominal voltage, ±5% tolerance, and SOT-23-3 package. The impedance is 41 Ohms (versus 80 Ohms) and reverse leakage is 100 nA @ 21 V (versus 100 nA @ 18.9 V). These differences are minor and acceptable for most applications. Verify circuit performance in applications sensitive to impedance or leakage characteristics.

Q: What is the difference between Nexperia and onsemi alternatives?

A: Both manufacturers provide 27 V Zener diodes in SOT-23-3 packaging. Nexperia parts (BZX84-A27,215, BZX84-C27,215, BZX84-C27,235) offer 250 mW power rating with AEC-Q101 qualification. onsemi parts (BZX84C27LT1G, MMBZ5254BLT1G, SZBZX84C27LT1G, SZMMBZ5254BLT1G) offer 225 mW power rating, with automotive-qualified variants available. Selection depends on power requirements and qualification needs.

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