BZX84C16 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX84C16 is a surface mount zener diode manufactured by onsemi, rated at 16.2 V nominal zener voltage with 350 mW maximum power dissipation in a SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across zener voltage, power rating, impedance, and thermal operating range while accommodating different packaging and supplier options.

Key Parameters

Parameter	BZX84C16 Value	Unit
Voltage - Zener (Nom)	16.2	V
Tolerance	±6%	%
Power - Max	350	mW
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 11.2 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZX84C16 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage nominal rating within the 16 V to 16.2 V range
Power dissipation rating of 250 mW or greater
Impedance (Zzt) maximum of 40 Ohms or lower
Reverse leakage current specification at rated voltage
Forward voltage drop at 10 mA
Operating temperature range encompassing -55°C to 150°C
Surface mount package compatibility (SOT-23-3, TO-236-3, or equivalent footprint)
Moisture sensitivity level 1 (Unlimited)

Acceptable Variations:

Zener voltage tolerance may differ (±5% or ±6%)
Power rating may exceed 350 mW
Impedance may be lower than 40 Ohms
Operating temperature range may extend beyond the original specification
Reverse leakage current may differ at specified voltage points
Packaging format (Tape & Reel, Cut Tape, Bulk) does not affect electrical compatibility

Non-Substitutable Variations:

Zener voltage below 16 V or above 16.2 V
Power rating below 250 mW
Impedance exceeding 40 Ohms
Operating temperature range not encompassing -55°C to 150°C
Package types requiring different PCB footprints (e.g., SOT-363 array configurations)

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf @ 10mA	Temp Range	Package	Status
BZX84C16	onsemi	16.2 V	±6%	350 mW	40 Ω	900 mV	-55 to 150°C	SOT-23-3	Obsolete
BZX84C16LT1G	onsemi	16 V	±6%	225 mW	40 Ω	900 mV	-65 to 150°C	SOT-23-3	Active
BZX84-C16,215	Nexperia USA Inc.	16 V	±5%	250 mW	40 Ω	900 mV	-65 to 150°C	SOT-23-3	Active
BZX84-C16,235	Nexperia USA Inc.	16 V	±5%	250 mW	40 Ω	900 mV	-65 to 150°C	SOT-23-3	Active
BZX84C16-TP	Micro Commercial Co	16 V	±5%	350 mW	40 Ω	900 mV	-55 to 150°C	SOT-23-3	Active
CMPZ5246B TR PBFREE	Central Semiconductor Corp	16 V	±5%	350 mW	17 Ω	900 mV	-65 to 150°C	SOT-23-3	Active
CMPZ5246B BK PBFREE	Central Semiconductor Corp	16 V	±5%	350 mW	17 Ω	900 mV	-65 to 150°C	SOT-23-3	Active
MMBZ5246BW-7-F	Diodes Incorporated	16 V	±5%	200 mW	17 Ω	900 mV	-65 to 150°C	SOT-323	Active
MMBZ5246BS-7-F	Diodes Incorporated	16 V	±5%	200 mW	17 Ω	900 mV	-65 to 150°C	SOT-363	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Footprint - SOT-23-3):

The following parts provide direct substitution with identical SOT-23-3 package compatibility:

BZX84C16-TP (Micro Commercial Co): Maintains 350 mW power rating and -55 to 150°C operating range. Zener voltage specified at 16 V with ±5% tolerance. RoHS3 compliant. Recommended for applications requiring maximum power dissipation matching.
BZX84-C16,215 and BZX84-C16,235 (Nexperia USA Inc.): Both rated at 16 V, 250 mW, ±5% tolerance. Extended temperature range to -65°C. AEC-Q101 automotive qualified. Recommended for automotive and extended temperature applications.
CMPZ5246B TR PBFREE and CMPZ5246B BK PBFREE (Central Semiconductor Corp): Rated at 16 V, 350 mW, ±5% tolerance. Lower impedance (17 Ω vs. 40 Ω). Extended temperature range to -65°C. Packaging options include Tape & Reel and Bulk. Recommended for applications benefiting from lower impedance characteristics.
BZX84C16LT1G (onsemi): Same manufacturer as original part. Rated at 16 V, 225 mW, ±6% tolerance. Extended temperature range to -65°C. Lower power rating requires verification for applications demanding 350 mW dissipation.

Alternative Package Options (Different Footprint):

MMBZ5246BW-7-F (Diodes Incorporated): SOT-323 package (smaller footprint). Rated at 16 V, 200 mW, ±5% tolerance. Lower impedance (17 Ω). AEC-Q101 automotive qualified. Suitable for space-constrained designs with reduced power requirements.
MMBZ5246BS-7-F (Diodes Incorporated): SOT-363 dual independent zener array. Rated at 16 V per element, 200 mW per element, ±5% tolerance. Requires different PCB layout. Not recommended as direct substitute for single-element applications.

Product Status Consideration:

All recommended substitutes carry Active product status, ensuring continued availability and manufacturing support. The original BZX84C16 (Obsolete status) should be replaced in new designs using one of the active alternatives listed above.

Frequently Asked Questions (FAQ)

Q: Can BZX84C16LT1G replace BZX84C16 in all applications?

A: BZX84C16LT1G provides electrical compatibility for zener voltage and impedance. However, the power rating is reduced from 350 mW to 225 mW. Substitution is valid only for applications where thermal dissipation does not exceed 225 mW. Verify circuit power requirements before selection.

Q: What is the difference between BZX84-C16,215 and BZX84-C16,235?

A: Both parts are electrically identical (16 V, 250 mW, ±5%, SOT-23-3). The difference is packaging format: BZX84-C16,215 is supplied in Tape & Reel format, while BZX84-C16,235 is supplied in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why do CMPZ5246B parts have lower impedance (17 Ω vs. 40 Ω)?

A: Lower impedance is a characteristic of the CMPZ5246B design. This provides improved voltage regulation and faster transient response. Lower impedance is not a limitation and is generally beneficial for voltage regulation applications. Verify compatibility with circuit design requirements.

Q: Can MMBZ5246BW-7-F be used as a direct replacement?

A: MMBZ5246BW-7-F is electrically compatible (16 V, ±5%, 900 mV forward voltage). However, the package is SOT-323 instead of SOT-23-3, requiring different PCB footprint and layout. Power rating is reduced to 200 mW. Use only if PCB design accommodates SOT-323 package and thermal requirements do not exceed 200 mW.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance status. The original BZX84C16 does not specify RoHS status due to obsolete classification.

Q: Which substitute offers the best automotive qualification?

A: BZX84-C16,215, BZX84-C16,235, and MMBZ5246BW-7-F all carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What is the temperature range difference between BZX84C16 and its substitutes?

A: The original BZX84C16 operates from -55°C to 150°C. Most active substitutes extend the lower limit to -65°C, providing wider temperature coverage. This extended range does not affect compatibility and is beneficial for applications in extreme cold environments.

Q: Can MMBZ5246BS-7-F replace BZX84C16?

A: MMBZ5246BS-7-F is a dual independent zener array in SOT-363 package, not a single-element diode. It is not suitable as a direct replacement for single-element applications. Use only in designs specifically requiring dual zener functionality.

Q: What is the significance of "PBFREE" designation in CMPZ5246B part numbers?

A: PBFREE indicates lead-free solder compatibility, confirming RoHS compliance. This is a manufacturing and environmental designation with no impact on electrical performance or substitution compatibility.

Q: How do I verify if a substitute part is suitable for my application?

A: Compare the following parameters against your circuit requirements: (1) Zener voltage nominal rating (16 V to 16.2 V range), (2) Maximum power dissipation (must equal or exceed circuit requirement), (3) Operating temperature range (must encompass your application environment), (4) Package footprint (must match PCB design or accommodate redesign), (5) Impedance specification (lower impedance provides better regulation). All listed substitutes meet the primary electrical criteria for the BZX84C16.

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