BZT52C27S-TP Equivalent & Substitute Parts

Part Overview

The BZT52C27S-TP is a 27 V Zener diode manufactured by Micro Commercial Co, rated for 200 mW power dissipation in a surface mount SOD-323 package. This component is classified as Active and is RoHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity while maintaining electrical and mechanical compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±7%	%
Power - Maximum	200	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	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZT52C27S-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage must be 27 V nominal
Operating temperature range must encompass -65°C to 150°C
Forward voltage and reverse leakage characteristics must be within acceptable limits for the application circuit

Mechanical Compatibility Requirements:

Surface mount package type (SOD-323 or SOD-323F variants)
Pin configuration and footprint compatibility

Regulatory & Compliance Requirements:

RoHS3 compliance
MSL rating of 1 (Unlimited)

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (Same Power Rating): Parts rated at 200 mW with 27 V nominal zener voltage and compatible package specifications.

Higher Power Rated Alternatives (300 mW to 550 mW): Parts with identical zener voltage and superior power handling capability, suitable for applications requiring increased thermal margin or higher current capacity. These parts maintain electrical compatibility while offering enhanced performance headroom.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Vf (Max) @ If	Temp Range	RoHS3
BZT52C27S-TP	Micro Commercial Co	27 V	±7%	200 mW	80 Ω	SOD-323	900 mV @ 10 mA	-65 to 150°C	Yes
MM3Z27VT1G	onsemi	27 V	±5%	300 mW	80 Ω	SOD-323	900 mV @ 10 mA	-65 to 150°C	Yes
DDZ9711S-7	Diodes Incorporated	27 V	±5%	200 mW	—	SOD-323	900 mV @ 10 mA	-65 to 150°C	Yes
MMSZ5254BS-7-F	Diodes Incorporated	27 V	±5%	200 mW	41 Ω	SOD-323	900 mV @ 10 mA	-65 to 150°C	Yes
MM3Z27VB	onsemi	27 V	±2%	200 mW	75 Ω	SOD-323F	1 V @ 10 mA	-65 to 150°C	Yes
MM3Z27VC	Fairchild Semiconductor	27 V	±5%	200 mW	75 Ω	SOD-323F	1 V @ 10 mA	-65 to 150°C	—
PZU27BA,115	Nexperia USA Inc.	27 V	±5%	320 mW	40 Ω	SOD-323	1.1 V @ 100 mA	-55 to 150°C	Yes
BZX84J-C27,115	Nexperia USA Inc.	27 V	±5%	550 mW	40 Ω	SOD-323F	1.1 V @ 100 mA	-65 to 150°C	Yes
BZX84J-C27,135	Nexperia USA Inc.	27 V	±5%	550 mW	40 Ω	SOD-323F	1.1 V @ 100 mA	-65 to 150°C	Yes
BZX84J-B27,115	Nexperia USA Inc.	27 V	±2%	550 mW	40 Ω	SOD-323F	1.1 V @ 100 mA	-65 to 150°C	Yes
DDZ27DSF-7	Diodes Incorporated	26.97 V	±2.5%	500 mW	70 Ω	SOD-323F	900 mV @ 10 mA	-65 to 150°C	Yes

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

DDZ9711S-7 and MMSZ5254BS-7-F are direct electrical equivalents to the BZT52C27S-TP, both rated at 27 V, 200 mW, with SOD-323 packaging and -65°C to 150°C operating range. Both are RoHS3 compliant with MSL 1 rating. These parts are suitable for one-to-one substitution in existing designs without circuit modification.

For Enhanced Performance (Higher Power Dissipation):

MM3Z27VT1G (300 mW), PZU27BA,115 (320 mW), and the BZX84J series (550 mW) provide increased power handling capability while maintaining 27 V nominal zener voltage and full operating temperature range. These parts are applicable in designs requiring thermal margin improvement or higher current capacity. The BZX84J-C27,115, BZX84J-C27,135, and BZX84J-B27,115 variants include AEC-Q101 automotive qualification and are suitable for automotive-grade applications.

Package Considerations:

The original BZT52C27S-TP uses SOD-323 (SC-76) packaging. Substitute parts using SOD-323F (SC-90) packaging have identical electrical performance but differ in physical dimensions. Verify PCB footprint compatibility before selection. SOD-323 and SOD-323F packages are not interchangeable on the same PCB layout.

Tolerance Selection:

The BZT52C27S-TP specifies ±7% tolerance. Substitute parts with tighter tolerances (±2% to ±5%) provide improved voltage regulation accuracy and are suitable for precision voltage reference applications. Parts with ±5% tolerance offer balanced performance and cost-effectiveness for general-purpose applications.

Compliance Verification:

All recommended substitute parts maintain RoHS3 compliance and MSL 1 rating. Nexperia BZX84J series parts include AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can I use MM3Z27VT1G (300 mW) as a direct replacement for BZT52C27S-TP (200 mW)?

A: Yes. MM3Z27VT1G is electrically compatible with identical 27 V nominal zener voltage, -65°C to 150°C operating range, and SOD-323 package. The higher power rating (300 mW vs. 200 mW) provides additional thermal margin without affecting circuit operation. Both parts are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between SOD-323 and SOD-323F packages?

A: SOD-323 (SC-76) and SOD-323F (SC-90) are different physical package variants with different footprints. SOD-323F is a larger package variant. These packages are not interchangeable on the same PCB. Verify your PCB layout supports the selected package before substitution.

Q: Are the BZX84J-C27 variants suitable for my application if I only need 200 mW?

A: Yes. BZX84J-C27,115 and BZX84J-C27,135 are rated for 550 mW and maintain 27 V nominal zener voltage with -65°C to 150°C operating range. The higher power rating does not degrade performance in lower-power applications. These parts are suitable for designs requiring future power margin or thermal headroom. Both include AEC-Q101 automotive qualification.

Q: What is the significance of tolerance differences between ±7%, ±5%, and ±2%?

A: Tolerance specifies the allowable deviation from nominal zener voltage. BZT52C27S-TP (±7%) allows 25.1 V to 28.9 V. Substitute parts with ±5% tolerance allow 25.65 V to 28.35 V. Parts with ±2% tolerance allow 26.46 V to 27.54 V. Tighter tolerances are required for precision voltage reference circuits; general-purpose applications accept wider tolerances.

Q: Can I substitute a part with a different forward voltage specification?

A: Forward voltage (Vf) specifications apply to forward-biased operation and do not affect zener regulation performance in reverse-biased applications. However, verify that your circuit does not rely on forward-biased diode operation before substituting parts with different Vf ratings.

Q: Are all substitute parts available in the same packaging options?

A: No. The BZT52C27S-TP is supplied in Tape & Reel (TR) packaging. Substitute parts are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or Bulk packaging depending on manufacturer and part number. Verify packaging availability with your supplier before design finalization.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts with AEC-Q101 qualification (BZX84J series) meet automotive reliability and quality requirements and are suitable for automotive applications. Non-qualified parts are suitable for industrial and consumer applications.

Q: Can I use DDZ27DSF-7 if my design specifies exactly 27 V?

A: DDZ27DSF-7 is rated at 26.97 V nominal with ±2.5% tolerance, resulting in a range of 26.27 V to 27.67 V. This part is suitable for applications with 27 V ±2.5% tolerance requirements. Verify your circuit tolerance specification before substitution. For applications requiring exactly 27 V ±7%, the original BZT52C27S-TP or equivalent parts with ±7% tolerance are appropriate.

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