MMBZ5223B-7 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5223B-7 is a 2.7 V zener diode manufactured by Diodes Incorporated, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates across a temperature range of -65°C to 150°C and is classified as RoHS non-compliant. Substitute parts must maintain the core electrical characteristics: 2.7 V nominal zener voltage, surface mount SOT-23-3 package compatibility, and comparable power handling and impedance specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	75	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5223B-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 2.7 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
Operating temperature range: -65°C to 150°C minimum
Forward voltage: 900 mV @ 10 mA maximum

Secondary Substitution Criteria:

Power rating: 350 mW or greater
Impedance: 30 Ohms or lower (preferred for lower impedance designs)
Tolerance: ±5% or tighter
Reverse leakage: 75 µA @ 1 V or lower

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes: Parts from Diodes Incorporated and Nexperia USA Inc. that maintain identical or superior electrical specifications with active product status and RoHS3 compliance.

Parametric Equivalents: Parts from alternative manufacturers (onsemi, Vishay, Micro Commercial Co, Central Semiconductor Corp) that meet the core electrical requirements within acceptable tolerance ranges and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ 1V (µA)	Vf @ 10mA (mV)	Temp Range (°C)	Status	RoHS
MMBZ5223B-7	Diodes Inc.	2.7	±5%	350	30	75	900	-65 to 150	Discontinued	Non-compliant
MMBZ5223B-7-F	Diodes Inc.	2.7	±5%	350	30	75	900	-65 to 150	Active	ROHS3
BZX84-A2V7,215	Nexperia USA Inc.	2.7	±1%	250	100	20	900	-65 to 150	Active	ROHS3
BZX84-B2V7,215	Nexperia USA Inc.	2.7	±2%	250	100	20	900	-65 to 150	Active	ROHS3
BZX84C2V7-E3-08	Vishay General Semiconductor	2.7	±5%	300	100	20	—	-55 to 150	Active	ROHS3
BZX84C2V7-TP	Micro Commercial Co	2.7	±5%	350	100	20	900	-55 to 150	Active	ROHS3
BZX84C2V7LT1G	onsemi	2.7	±7%	225	100	20	900	-65 to 150	Active	ROHS3
MMBZ5223BLT1G	onsemi	2.7	±5%	225	30	75	900	-65 to 150	Active	ROHS3
SZBZX84C2V7ET1G	onsemi	2.7	±7%	225	100	20	900	-65 to 150	Active	ROHS3
SZBZX84C2V7LT1G	onsemi	2.7	±7%	225	100	20	900	-65 to 150	Active	ROHS3
CMPZ5223B TR PBFREE	Central Semiconductor Corp	2.7	±5%	350	30	75	900	-65 to 150	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Specifications):

MMBZ5223B-7-F is the primary direct replacement. This part maintains all electrical specifications of the original MMBZ5223B-7 while offering active product status and RoHS3 compliance. It is supplied in Tape & Reel packaging with 4975 units in stock.

CMPZ5223B TR PBFREE from Central Semiconductor Corp provides an alternative direct replacement with identical electrical parameters (2.7 V, ±5%, 350 mW, 30 Ohms impedance, 75 µA leakage). This part is RoHS3 compliant and actively manufactured.

Tier 2 - Functional Equivalents with Reduced Power Rating:

MMBZ5223BLT1G from onsemi maintains the original impedance specification (30 Ohms) and tolerance (±5%) but operates at 225 mW maximum power. This part is suitable for applications where the full 350 mW rating is not required. It offers RoHS3 compliance and -65°C to 150°C operating range.

Tier 3 - Functional Equivalents with Higher Impedance:

BZX84C2V7-TP from Micro Commercial Co provides 350 mW power rating with ±5% tolerance but features 100 Ohms impedance (versus 30 Ohms original). This part is suitable for applications tolerant of higher impedance characteristics.

BZX84C2V7-E3-08 from Vishay General Semiconductor offers 300 mW power with ±5% tolerance and 100 Ohms impedance. Operating temperature range is -55°C to 150°C (reduced low-temperature specification).

Tier 4 - Automotive-Grade Alternatives:

BZX84-A2V7,215 and BZX84-B2V7,215 from Nexperia USA Inc. are automotive-qualified (AEC-Q101) parts with tighter tolerance specifications (±1% and ±2% respectively). Both operate at 250 mW with 100 Ohms impedance. These parts are suitable for automotive applications requiring higher voltage accuracy.

SZBZX84C2V7LT1G and SZBZX84C2V7ET1G from onsemi are automotive-qualified (AEC-Q101) with ±7% tolerance and 225 mW power rating. These parts feature 100 Ohms impedance and are suitable for automotive designs.

Selection Criteria by Application:

For direct replacement in existing designs: MMBZ5223B-7-F or CMPZ5223B TR PBFREE.

For power-constrained applications: MMBZ5223BLT1G, BZX84C2V7LT1G, SZBZX84C2V7LT1G, or SZBZX84C2V7ET1G.

For automotive applications: BZX84-A2V7,215, BZX84-B2V7,215, SZBZX84C2V7LT1G, or SZBZX84C2V7ET1G.

For maximum availability: BZX84C2V7LT1G (59,100 units) or BZX84-B2V7,215 (27,455 units).

Frequently Asked Questions (FAQ)

Q: Can MMBZ5223B-7-F be used as a direct replacement for MMBZ5223B-7?

A: Yes. MMBZ5223B-7-F is a direct replacement with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus bulk) and product status (Active versus Discontinued). Both maintain 2.7 V nominal zener voltage, ±5% tolerance, 350 mW power rating, 30 Ohms impedance, and -65°C to 150°C operating range.

Q: What is the difference between parts with 30 Ohms and 100 Ohms impedance?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode. Lower impedance (30 Ohms) provides better voltage regulation under varying load conditions. Higher impedance (100 Ohms) results in greater voltage variation with load changes. Selection depends on circuit requirements for voltage stability.

Q: Are the onsemi parts with ±7% tolerance acceptable substitutes?

A: onsemi parts with ±7% tolerance (BZX84C2V7LT1G, SZBZX84C2V7ET1G, SZBZX84C2V7LT1G) are acceptable substitutes where the wider tolerance is compatible with circuit design margins. The original MMBZ5223B-7 specifies ±5% tolerance. Applications requiring tighter voltage control should use parts with ±5% or better tolerance.

Q: What is the significance of the reduced power rating in MMBZ5223BLT1G (225 mW versus 350 mW)?

A: The reduced power rating indicates lower maximum power dissipation capability. This part is suitable for applications where the zener diode operates below 225 mW. For applications requiring the full 350 mW capability, use MMBZ5223B-7-F or CMPZ5223B TR PBFREE.

Q: Are automotive-qualified parts (AEC-Q101) required for this application?

A: Automotive qualification is required only for automotive applications. For general industrial or consumer applications, non-automotive parts are acceptable. Automotive-qualified alternatives include BZX84-A2V7,215, BZX84-B2V7,215, SZBZX84C2V7LT1G, and SZBZX84C2V7ET1G.

Q: What is the difference between SOT-23-3 and TO-236AB package designations?

A: SOT-23-3 and TO-236-3 (also referenced as TO-236AB and SC-59) are equivalent package designations for the same physical form factor. All substitute parts listed are compatible with the original SOT-23-3 footprint.

Q: Why do some parts specify -55°C minimum operating temperature instead of -65°C?

A: BZX84C2V7-E3-08 from Vishay specifies -55°C to 150°C operating range, which is narrower than the original -65°C to 150°C specification. This part is suitable for applications operating above -55°C. For applications requiring -65°C operation, use parts specifying -65°C minimum temperature.

Q: What does RoHS3 compliance mean?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive. All active substitute parts listed are RoHS3 compliant. The original MMBZ5223B-7 is RoHS non-compliant. RoHS3 compliance is required for most new designs and procurement in regulated markets.

Q: Which substitute part has the highest inventory availability?

A: BZX84C2V7LT1G from onsemi has the highest inventory with 59,100 units in stock. BZX84-B2V7,215 from Nexperia has 27,455 units. MMBZ5223B-7-F has 4,975 units available.

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