BZX84C11 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX84C11 is a surface mount Zener diode manufactured by onsemi, rated at 11 V nominal Zener voltage with 350 mW maximum power dissipation. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The BZX84C11 is packaged in SOT-23-3 (TO-236-3) configuration and operates across the temperature range of -55°C to 150°C.

Substitute parts are identified based on matching or exceeding the core electrical specifications: 11 V Zener voltage, ±5% tolerance, SOT-23-3 package compatibility, and surface mount mounting type. Active alternatives from multiple manufacturers provide equivalent or enhanced performance characteristics while maintaining form-factor compatibility.

Key Parameters

Parameter	BZX84C11 (Main Part)	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	%
Power - Max	350	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature	-55°C ~ 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution logic for the BZX84C11 is based on the following critical parameters:

Primary Matching Criteria:

Zener voltage: 11 V nominal
Voltage tolerance: ±5%
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Forward voltage: 900 mV @ 10 mA maximum

Secondary Compatibility Factors:

Power dissipation: 225 mW to 410 mW (all exceed minimum 225 mW requirement)
Impedance: 20 to 22 Ohms (within acceptable range)
Reverse leakage: 100 nA to 2 µA @ specified voltage
Operating temperature: -55°C to -65°C minimum; 150°C maximum

Substitute parts are grouped into three categories based on power rating alignment:

Category A (225 mW): BZX84C11LT1G, SZBZX84C11LT1G, BZX84-C11,215 — Lower power rating; suitable for applications with reduced thermal requirements.

Category B (250–300 mW): BZX84-C11,235, CZRT5241B-G, BZX84C11-7-F — Mid-range power rating; balanced performance across standard applications.

Category C (350–410 mW): BZX84C11 TR (Central Semiconductor), BZX84B11-TP, CMPZ5241B TR PBFREE, BZX84C11_R1_00001 — Higher power rating; equivalent or enhanced thermal capability.

All substitute parts maintain SOT-23-3 package compatibility and 11 V Zener voltage specification. Differences in power dissipation, impedance, and reverse leakage are within acceptable engineering tolerances for direct substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Ir @ Vr	Vf @ If	Temp Range (°C)	Product Status	RoHS
BZX84C11	onsemi	11	±5%	350	20	100 nA @ 8 V	900 mV @ 10 mA	-55 ~ 150	Obsolete	—
BZX84C11LT1G	onsemi	11	±5%	225	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
SZBZX84C11LT1G	onsemi	11	±5%	225	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
BZX84C11 TR	Central Semiconductor Corp	11	±5%	350	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
CZRT5241B-G	Comchip Technology	11	±5%	300	22	2 µA @ 8.4 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
BZX84C11-7-F	Diodes Incorporated	11	±5%	300	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
BZX84-C11,215	Nexperia USA Inc.	11	±5%	250	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3
BZX84-C11,235	NXP USA Inc.	11	±5%	250	20	100 nA @ 8 V	900 mV @ 10 mA	-65 ~ 150	Active	—
BZX84B11-TP	Micro Commercial Co	11	±2%	350	20	100 nA @ 8 V	900 mV @ 10 mA	-55 ~ 150	Active	ROHS3
BZX84C11_R1_00001	Panjit International Inc.	11	±5%	410	20	100 nA @ 8 V	—	-55 ~ 150	Active	ROHS3
CMPZ5241B TR PBFREE	Central Semiconductor Corp	11	±5%	350	22	2 µA @ 8.4 V	900 mV @ 10 mA	-65 ~ 150	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

BZX84C11 TR (Central Semiconductor Corp) provides direct electrical and mechanical equivalence to the obsolete onsemi BZX84C11. This part maintains identical 11 V Zener voltage, 350 mW power rating, 20 Ohm impedance, and SOT-23-3 package configuration. Operating temperature range extends to -65°C minimum, exceeding the original specification. ROHS3 compliance and active product status ensure long-term availability and regulatory alignment.

Secondary Recommendations by Application Profile:

For applications with reduced power dissipation requirements (≤225 mW), BZX84C11LT1G or SZBZX84C11LT1G (both onsemi) are suitable alternatives. SZBZX84C11LT1G carries AEC-Q101 automotive qualification, appropriate for automotive-grade applications. Both parts are active with ROHS3 compliance.

For mid-range power applications (250–300 mW), BZX84C11-7-F (Diodes Incorporated) or BZX84-C11,215 (Nexperia USA Inc.) are appropriate. BZX84-C11,215 includes AEC-Q101 automotive qualification. Both maintain 20 Ohm impedance and 100 nA reverse leakage specification.

For applications requiring enhanced thermal performance (350–410 mW), BZX84C11_R1_00001 (Panjit International Inc.) offers 410 mW maximum power dissipation while maintaining all other electrical specifications. BZX84B11-TP (Micro Commercial Co) provides ±2% tolerance tighter than the standard ±5%, with 350 mW power rating.

Compliance Considerations:

All recommended substitute parts are ROHS3 compliant and carry REACH Unaffected status. Parts designated with AEC-Q101 qualification (SZBZX84C11LT1G, BZX84-C11,215, BZX84-C11,235) are suitable for automotive applications requiring formal qualification documentation.

Inventory and Availability:

BZX84C11-7-F (Diodes Incorporated) offers the highest inventory availability at 35,100 units. BZX84-C11,235 (NXP USA Inc.) provides 30,671 units. BZX84C11LT1G (onsemi) maintains 54,400 units in stock. These options ensure supply chain continuity for high-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can BZX84C11LT1G replace the obsolete BZX84C11 in all applications?

A: BZX84C11LT1G is electrically compatible for applications where power dissipation does not exceed 225 mW. The original BZX84C11 is rated at 350 mW. If the application requires the full 350 mW thermal capability, BZX84C11LT1G is not suitable. For applications operating below 225 mW, BZX84C11LT1G provides direct substitution with improved temperature range (-65°C minimum vs. -55°C).

Q: What is the difference between BZX84C11 and BZX84B11-TP?

A: Both parts are rated at 11 V Zener voltage and 350 mW power dissipation in SOT-23-3 package. The primary difference is voltage tolerance: BZX84C11 specifies ±5% tolerance, while BZX84B11-TP specifies ±2% tolerance. BZX84B11-TP provides tighter voltage regulation. Operating temperature ranges differ slightly: BZX84C11 operates -55°C to 150°C, while BZX84B11-TP operates -55°C to 150°C (identical). Both are active products with ROHS3 compliance.

Q: Are Nexperia and NXP parts interchangeable?

A: BZX84-C11,215 (Nexperia USA Inc.) and BZX84-C11,235 (NXP USA Inc.) are both 11 V Zener diodes in SOT-23-3 package with ±5% tolerance. Both are rated at 250 mW power dissipation and operate -65°C to 150°C. The primary difference is packaging: BZX84-C11,215 is supplied in Cut Tape (CT) & Digi-Reel format, while BZX84-C11,235 is supplied in Bulk. Both include AEC-Q101 automotive qualification. Electrical performance is equivalent; selection depends on packaging and handling requirements.

Q: Why do some substitute parts have different reverse leakage specifications?

A: Reverse leakage current varies by manufacturer process and design. The original BZX84C11 specifies 100 nA @ 8 V. Substitute parts from Comchip Technology (CZRT5241B-G, CMPZ5241B TR PBFREE) specify 2 µA @ 8.4 V, which is higher but remains within acceptable engineering tolerances for Zener diode applications. Higher reverse leakage does not affect Zener regulation performance in typical circuit applications. Selection should be based on specific circuit requirements if reverse leakage is a critical parameter.

Q: Can I use a 225 mW part in place of a 350 mW part?

A: Substitution of lower power-rated parts is only appropriate if the actual circuit power dissipation does not exceed the substitute part's rating. The 225 mW parts (BZX84C11LT1G, SZBZX84C11LT1G) are suitable for applications dissipating ≤225 mW. If the circuit requires thermal capability approaching 350 mW, lower-rated substitutes will experience excessive junction temperature and reduced reliability. Thermal analysis of the specific application is required to determine appropriate power rating.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (SZBZX84C11LT1G, BZX84-C11,215, BZX84-C11,235) have undergone rigorous testing for automotive applications, including temperature cycling, moisture resistance, and reliability verification. AEC-Q101 qualification is required for automotive-grade designs and provides documented evidence of suitability for automotive environments.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except BZX84-C11,235 (NXP USA Inc.), which does not specify RoHS status in the provided data. ROHS3 compliance indicates the part contains no lead, cadmium, hexavalent chromium, or other restricted substances. For applications requiring ROHS3 certification, verify compliance status with the specific manufacturer or distributor.

Q: What is the significance of the SOT-23-3 package designation?

A: SOT-23-3 (also designated TO-236-3 or SC-59) is a three-terminal surface mount package with standardized pin configuration and footprint. All substitute parts maintain this package type, ensuring mechanical and electrical compatibility with existing PCB designs. No layout modifications are required when substituting between parts with identical SOT-23-3 designation.

Q: Can I substitute parts with different impedance values (20 Ohms vs. 22 Ohms)?

A: Impedance differences of 20 Ohms to 22 Ohms are within acceptable engineering tolerance for Zener diode applications. Impedance affects transient response and noise filtering characteristics. For applications with strict impedance requirements, parts with matching impedance (20 Ohms) are preferred. For general voltage regulation applications, the 2 Ohm difference is negligible.

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