BZX84C27-TP Equivalent & Substitute Parts

Part Overview

The BZX84C27-TP is a 27 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW power dissipation with ±5% voltage tolerance. This surface mount component in SOT-23 packaging is designed for voltage regulation and protection applications in electronic circuits. The part is currently Active in product status and RoHS3 compliant. Substitute parts are necessary when the primary part is unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific performance characteristics such as lower tolerance, higher power rating, or automotive qualification are required for the application.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18.9 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZX84C27-TP is determined by the following critical parameters: nominal Zener voltage of 27 V, surface mount SOT-23 package compatibility, operating temperature range, and RoHS3 compliance. All substitute parts listed maintain the 27 V Zener voltage specification and are housed in mechanically and electrically compatible TO-236-3/SOT-23-3 packages.

Substitute parts are grouped into two categories based on power rating and tolerance specifications:

Category 1: Lower Power Rating (250 mW) — Parts with reduced maximum power dissipation compared to the main part. These include Nexperia BZX84-A27,215 and BZX84-C27 variants, and Fairchild BZX84B27LT1G. These parts are suitable for applications where the full 350 mW rating is not required.

Category 2: Equivalent or Higher Power Rating (300–350 mW) — Parts with power ratings at or above 300 mW, including Diodes Incorporated BZX84B27-7-F and BZX84C27-7-F, and Vishay BZX84B27-E3-08, BZX84C27-E3-08, BZX84C27-G3-18, and BZX84C27-HE3-08. These parts provide performance characteristics comparable to or exceeding the main part.

Tolerance variations (±1%, ±2%, ±5%, ±7%) are secondary selection criteria and do not prevent substitution; however, tighter tolerances (±1%, ±2%) provide improved voltage regulation accuracy. Automotive-qualified parts (AEC-Q101) are available from Nexperia and Vishay for applications requiring automotive-grade reliability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Product Status	AEC-Q101
BZX84C27-TP	Micro Commercial Co	27	±5%	350	80	100 @ 18.9	900 @ 10	-55 to 150	SOT-23-3	Active	—
BZX84-A27,215	Nexperia USA Inc.	27	±1%	250	80	50 @ 18.9	900 @ 10	-65 to 150	TO-236AB	Active	Yes
BZX84-C27,215	Nexperia USA Inc.	27	±5%	250	80	50 @ 18.9	900 @ 10	-65 to 150	TO-236AB	Active	Yes
BZX84-C27,235	Nexperia USA Inc.	27	±5%	250	80	50 @ 18.9	900 @ 10	-65 to 150	TO-236AB	Active	Yes
BZX84B27-7-F	Diodes Incorporated	27	±2%	300	80	100 @ 18.9	900 @ 10	-65 to 150	SOT-23-3	Active	—
BZX84B27-E3-08	Vishay General Semiconductor	27	±2%	300	80	50 @ 18.9	—	-55 to 150	SOT-23-3	Active	—
BZX84B27LT1G	Fairchild Semiconductor	27	±2%	250	80	50 @ 18.9	900 @ 10	-65 to 150	SOT-23-3	Active	—
BZX84C27-7-F	Diodes Incorporated	27	±7%	300	80	100 @ 18.9	900 @ 10	-65 to 150	SOT-23-3	Active	—
BZX84C27-E3-08	Vishay General Semiconductor	27	±5%	300	80	50 @ 18.9	—	-55 to 150	SOT-23-3	Active	—
BZX84C27-G3-18	Vishay General Semiconductor	27	±5%	300	80	50 @ 18.9	—	-55 to 150	SOT-23-3	Active	—
BZX84C27-HE3-08	Vishay General Semiconductor	27	±5%	300	80	50 @ 18.9	—	-55 to 150	SOT-23-3	Obsolete	Yes

Engineering Selection Recommendations

All listed substitute parts maintain the critical 27 V Zener voltage specification and are compatible with the SOT-23-3 package footprint. Selection among substitutes is based on the following engineering criteria:

For Active Product Status: Nexperia BZX84-A27,215, BZX84-C27,215, and BZX84-C27,235; Diodes Incorporated BZX84B27-7-F and BZX84C27-7-F; Vishay BZX84B27-E3-08, BZX84C27-E3-08, and BZX84C27-G3-18; and Fairchild BZX84B27LT1G are all currently Active and suitable for new designs and production applications.

For Automotive Applications: Nexperia BZX84-A27,215, BZX84-C27,215, and BZX84-C27,235 carry AEC-Q101 qualification and are recommended for automotive-grade circuit requirements. Vishay BZX84C27-HE3-08 also carries AEC-Q101 qualification but is marked Obsolete and should not be selected for new designs.

For Power Dissipation Requirements: The BZX84C27-TP is rated for 350 mW. Substitute parts rated at 300 mW (Diodes Incorporated and Vishay variants) are suitable for applications where thermal dissipation does not exceed 300 mW. Parts rated at 250 mW (Nexperia and Fairchild variants) are suitable for lower-power applications.

For Voltage Tolerance: The main part specifies ±5% tolerance. Nexperia BZX84-A27,215 offers tighter ±1% tolerance for applications requiring improved voltage regulation accuracy. Diodes Incorporated BZX84B27-7-F and Vishay variants offer ±2% tolerance as a middle ground.

For Temperature Range: The main part operates from -55°C to 150°C. Nexperia and Diodes Incorporated variants extend the lower temperature limit to -65°C, providing wider operating range for extreme environment applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 250 mW rated Zener diode for the 350 mW BZX84C27-TP?

A: Yes, provided the application circuit does not require power dissipation exceeding 250 mW. The 250 mW variants (Nexperia BZX84-A27,215, BZX84-C27,215, BZX84-C27,235, and Fairchild BZX84B27LT1G) are electrically and mechanically compatible. Verify that thermal design and circuit current limits do not exceed the lower power rating.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the TO-236-3/SOT-23-3 package, which is mechanically and electrically identical. PCB footprints designed for the BZX84C27-TP accept all listed substitutes without modification.

Q: What is the difference between ±1%, ±2%, ±5%, and ±7% tolerance ratings?

A: Tolerance specifies the allowable deviation of the actual Zener voltage from the nominal 27 V specification. ±1% tolerance (Nexperia BZX84-A27,215) provides the tightest voltage regulation, with actual voltage between 26.73 V and 27.27 V. ±5% tolerance (main part and most substitutes) allows voltage between 25.65 V and 28.35 V. ±7% tolerance (Diodes Incorporated BZX84C27-7-F) allows the widest deviation. Select tighter tolerance for precision voltage regulation applications.

Q: Which substitute parts are suitable for automotive applications?

A: Nexperia BZX84-A27,215, BZX84-C27,215, and BZX84-C27,235 carry AEC-Q101 automotive qualification. Vishay BZX84C27-HE3-08 also carries AEC-Q101 but is Obsolete. For new automotive designs, select from the active Nexperia variants.

Q: What is the significance of the operating temperature range difference between -55°C and -65°C?

A: The main part (BZX84C27-TP) operates from -55°C to 150°C. Nexperia and Diodes Incorporated variants extend the lower limit to -65°C, providing 10°C additional margin for extreme cold environment applications. For standard industrial applications, both ranges are acceptable.

Q: Can I use BZX84C27-7-F with ±7% tolerance instead of the ±5% main part?

A: Yes, mechanically and electrically. However, the ±7% tolerance results in wider voltage deviation (25.11 V to 28.89 V). Use only if the application circuit tolerates this wider voltage range. For precision voltage regulation, select parts with ±1%, ±2%, or ±5% tolerance.

Q: Why is BZX84C27-HE3-08 marked Obsolete?

A: Vishay BZX84C27-HE3-08 is no longer in active production. Although it meets all electrical and mechanical specifications, it should not be selected for new designs. Use active alternatives such as BZX84C27-E3-08 or BZX84C27-G3-18 from Vishay, or equivalent parts from other manufacturers.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the compliance status of the main part BZX84C27-TP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message