BZX84C22 TR Equivalent & Substitute Parts

Part Overview

The BZX84C22 TR is a surface mount Zener diode manufactured by Central Semiconductor Corp, rated at 22 V nominal Zener voltage with 350 mW maximum power dissipation. The device is packaged in SOT-23 (TO-236-3) configuration and operates across the temperature range of -65°C to 150°C. This part is Active status and ROHS3 compliant. Substitute parts are identified based on matching electrical characteristics (Zener voltage, power rating, impedance, leakage current, forward voltage) and mechanical compatibility (package type, mounting method, temperature range).

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 15.4 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84C22 TR is determined by the following criteria:

Primary Matching Parameters:

Zener voltage: 22 V (nominal)
Package / Case: TO-236-3, SC-59, SOT-23-3 (all equivalent designations for the same physical package)
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C minimum

Secondary Compatibility Parameters:

Power dissipation: 225 mW to 350 mW (parts rated below 225 mW or above 350 mW are excluded)
Impedance (Zzt): 29 to 55 Ohms (acceptable range for circuit performance)
Reverse leakage current: 50 to 100 nA (within acceptable limits)
Forward voltage: 900 mV @ 10 mA (standard across all candidates)
Tolerance: ±2% to ±6% (acceptable for voltage regulation applications)

Compliance Requirements:

RoHS3 Compliant (mandatory)
Active product status (preferred)

Substitute parts must satisfy all primary matching parameters and fall within the secondary compatibility ranges. Parts with lower power ratings (225 mW) are acceptable for applications with reduced thermal requirements. Parts with higher impedance values (up to 55 Ohms) maintain circuit performance within acceptable limits.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ Vr (nA)	Temp Range (°C)	Package	Status
BZX84C22 TR	Central Semiconductor	22	±5%	350	55	50 @ 15.4V	-65 to 150	SOT-23	Active
BZX84-B22,215	Nexperia USA Inc.	22	±2%	250	55	50 @ 15.4V	-65 to 150	TO-236AB	Active
BZX84-B22,235	Nexperia USA Inc.	22	±2%	250	55	50 @ 15.4V	-65 to 150	TO-236AB	Active
BZX84-C22,215	Nexperia USA Inc.	22	±5%	250	55	50 @ 15.4V	-65 to 150	TO-236AB	Active
BZX84-C22,235	NXP USA Inc.	22	±5%	250	55	50 @ 15.4V	-65 to 150	SOT-23	Active
BZX84B22-E3-08	Vishay General Semiconductor	22	±2%	300	55	50 @ 15.4V	-55 to 150	SOT-23-3	Active
BZX84B22LT1G	onsemi	22	±2%	225	55	50 @ 15.4V	-65 to 150	SOT-23-3	Active
BZX84C22-7-F	Diodes Incorporated	22	±6%	300	55	100 @ 15.4V	-65 to 150	SOT-23-3	Active
DDZX22D-7	Diodes Incorporated	22	±3%	300	30	50 @ 17V	-65 to 150	SOT-23-3	Active
MMBZ5251B-7-F	Diodes Incorporated	22	±5%	350	29	100 @ 17V	-65 to 150	SOT-23-3	Active
MMBZ5251BLT1G	onsemi	22	±5%	225	29	100 @ 17V	-65 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Full Equivalents (350 mW Power Rating):

MMBZ5251B-7-F (Diodes Incorporated) provides the closest electrical match to BZX84C22 TR with identical 350 mW power rating, 22 V Zener voltage, and ±5% tolerance. Lower impedance (29 Ohms vs. 55 Ohms) improves voltage regulation performance. All compliance requirements (ROHS3, Active status) are met. Temperature range -65°C to 150°C is identical.

High-Availability Substitutes (250-300 mW Power Rating):

BZX84-C22,235 (NXP USA Inc.) offers 250 mW power rating with matching ±5% tolerance and identical temperature range. Nexperia BZX84-B22,215 and BZX84-B22,235 provide tighter ±2% tolerance at 250 mW, suitable for applications requiring improved voltage accuracy. All three are AEC-Q101 qualified for automotive applications.

BZX84B22-E3-08 (Vishay) delivers 300 mW with ±2% tolerance and identical impedance (55 Ohms). Minimum operating temperature is -55°C (vs. -65°C for main part); verify application requirements before selection.

Lower Power Alternatives (225 mW Power Rating):

BZX84B22LT1G (onsemi) and MMBZ5251BLT1G (onsemi) both rated at 225 mW are suitable for applications with reduced thermal dissipation requirements. Both maintain full -65°C to 150°C temperature range and ROHS3 compliance.

Specialized Performance Option:

DDZX22D-7 (Diodes Incorporated) features lower impedance (30 Ohms) and tighter ±3% tolerance, providing superior voltage regulation stability. 300 mW power rating and full temperature range support general-purpose applications.

All recommended substitutes are Active status, ROHS3 compliant, and packaged in mechanically equivalent SOT-23 configurations.

Frequently Asked Questions (FAQ)

Q: Can BZX84C22 TR be replaced with a 250 mW rated part?

A: Yes. The BZX84-C22,215 and BZX84-C22,235 (both 250 mW) are direct substitutes for applications where thermal dissipation does not exceed 250 mW. Verify circuit power requirements before substitution.

Q: What is the difference between ±2%, ±3%, ±5%, and ±6% tolerance ratings?

A: Tolerance specifies the acceptable deviation of the Zener voltage from the nominal 22 V value. ±2% tolerance (±0.44 V) provides tighter voltage regulation than ±5% (±1.1 V). Select based on circuit voltage accuracy requirements.

Q: Are all substitute parts mechanically compatible with BZX84C22 TR?

A: Yes. All listed substitutes use TO-236-3 / SOT-23-3 package designations, which are mechanically and electrically equivalent. Pin configurations and PCB footprints are identical.

Q: What does impedance (Zzt) mean, and why does it vary?

A: Impedance (Zzt) is the dynamic resistance of the Zener diode in the breakdown region. Lower impedance (29-30 Ohms) provides better voltage regulation under load changes. Higher impedance (55 Ohms) is acceptable for general-purpose applications. Both ranges are functionally compatible.

Q: Can I use MMBZ5251B-7-F as a direct replacement for BZX84C22 TR?

A: Yes. MMBZ5251B-7-F matches the 350 mW power rating, 22 V Zener voltage, ±5% tolerance, and full temperature range. Lower impedance (29 Ohms) improves performance. All compliance certifications are met.

Q: Why do some parts specify leakage current at different voltages (15.4 V vs. 17 V)?

A: Reverse leakage current is measured at the specified reverse voltage. Both 15.4 V and 17 V measurements are within the Zener regulation region and indicate acceptable leakage performance. Differences reflect manufacturer test conditions and do not affect substitution eligibility.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is mandatory for automotive applications. Nexperia BZX84-B22 series parts carry this certification. For non-automotive applications, AEC-Q101 is not required but indicates higher reliability screening.

Q: What is the minimum operating temperature for BZX84B22-E3-08?

A: BZX84B22-E3-08 operates from -55°C to 150°C, compared to -65°C to 150°C for BZX84C22 TR. If your application requires operation below -55°C, select an alternative with -65°C minimum rating.

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