MMSZ13T1 Equivalent & Substitute Parts

Part Overview

The MMSZ13T1 is a Zener diode rated at 13 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability and compliance with current regulatory standards.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	13 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	30 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MMSZ13T1 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 13 V (exact match required)
Tolerance: ±5% or tighter
Package / Case: SOD-123 or SOD-123F
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C minimum

Secondary Compatibility Factors:

Power - Max: 500 mW or greater
Impedance (Max): 30 Ohms or lower
Current - Reverse Leakage: 100 nA @ 8 V or lower
Voltage - Forward (Vf): 900 mV @ 10 mA or lower

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status from onsemi.

Parametric Equivalents: Parts meeting or exceeding all critical electrical parameters from alternative manufacturers, including automotive-grade options with AEC-Q101 qualification.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ13T1	onsemi	13	±5%	500	30	100 @ 8V	900 @ 10mA	-55 ~ 150	SOD-123	Obsolete	Non-compliant
MMSZ13T1G	onsemi	13	±5%	500	30	100 @ 8V	900 @ 10mA	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
SZMMSZ13ET1G	onsemi	13	±5%	500	30	100 @ 8V	900 @ 10mA	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
SZMMSZ13T1G	onsemi	13	±5%	500	30	100 @ 8V	900 @ 10mA	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
DDZ9700Q-7	Diodes Incorporated	13	±5%	500	—	50 @ 9.8V	900 @ 10mA	-65 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C13-E3-08	Vishay	13	±5%	410	25	100 @ 10V	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C13-E3-18	Vishay	13	±5%	410	25	100 @ 10V	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C13-G3-08	Vishay	13	±5%	410	25	100 @ 10V	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C13-G3-18	Vishay	13	±5%	410	25	100 @ 10V	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C13-TP	Micro Commercial Co	13	±6%	200	30	100 @ 8V	900 @ 10mA	-65 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52H-C13,115	Nexperia USA Inc.	13	±5%	375	10	100 @ 8V	900 @ 10mA	-65 ~ 150	SOD-123F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended for Direct Replacement):

MMSZ13T1G and SZMMSZ13T1G are direct functional equivalents to the obsolete MMSZ13T1. Both parts are manufactured by onsemi, maintain identical electrical specifications, and are ROHS3 compliant. SZMMSZ13T1G includes automotive-grade qualification (AEC-Q101) and offers the highest inventory availability (95,100 units). MMSZ13T1G is suitable for non-automotive applications requiring standard industrial compliance.

Tier 2 - Parametric Equivalents (Automotive Applications):

SZMMSZ13ET1G provides automotive-grade performance with AEC-Q101 qualification and identical electrical specifications to the main part. DDZ9700Q-7 from Diodes Incorporated offers extended temperature range (-65°C to 150°C) and lower reverse leakage current (50 nA @ 9.8V), with active product status and ROHS3 compliance.

Tier 3 - Functional Alternatives (Power-Reduced Applications):

BZT52C13 variants (E3-08, E3-18, G3-08, G3-18) from Vishay maintain 13 V zener voltage and ±5% tolerance but with reduced power dissipation (410 mW). These are suitable for applications where the full 500 mW power rating is not required. All variants are ROHS3 compliant and active products.

BZT52C13-TP from Micro Commercial Co provides 200 mW power dissipation with extended temperature range (-65°C to 150°C). Tolerance is ±6%, which remains within acceptable substitution parameters.

Tier 4 - Alternative Package Option:

BZT52H-C13,115 from Nexperia uses SOD-123F package (alternative to SOD-123) with 375 mW power rating, ±5% tolerance, and automotive-grade AEC-Q101 qualification. This option is suitable only if PCB layout accommodates the SOD-123F footprint.

Frequently Asked Questions (FAQ)

Q: Can MMSZ13T1G directly replace MMSZ13T1 in existing designs?

A: Yes. MMSZ13T1G is a direct equivalent with identical electrical specifications, operating temperature range, and SOD-123 package. The primary difference is active product status and ROHS3 compliance. No design changes are required.

Q: What is the difference between SZMMSZ13T1G and MMSZ13T1G?

A: Both parts are electrically identical with 13 V zener voltage, 500 mW power, and SOD-123 package. SZMMSZ13T1G includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. MMSZ13T1G is suitable for general industrial use. SZMMSZ13T1G has significantly higher inventory availability.

Q: Can BZT52C13 variants substitute for MMSZ13T1?

A: BZT52C13 variants maintain the 13 V zener voltage and ±5% tolerance but have reduced power dissipation (410 mW versus 500 mW). These are suitable substitutes only if the application does not require the full 500 mW power rating. All variants are ROHS3 compliant and active products.

Q: Is BZT52C13-TP compatible with MMSZ13T1?

A: BZT52C13-TP maintains 13 V zener voltage and SOD-123 package but has significantly reduced power dissipation (200 mW). Tolerance is ±6% versus ±5%. This part is suitable only for low-power applications. Extended temperature range (-65°C to 150°C) provides additional margin.

Q: What is the significance of the SOD-123F package in BZT52H-C13,115?

A: SOD-123F is a variant of the SOD-123 package with different mechanical dimensions. BZT52H-C13,115 can only substitute MMSZ13T1 if the PCB layout and footprint accommodate SOD-123F. Standard SOD-123 footprints will not accept SOD-123F components.

Q: Which substitute part offers the best reverse leakage performance?

A: DDZ9700Q-7 from Diodes Incorporated specifies 50 nA @ 9.8V reverse leakage current, which is lower than the MMSZ13T1 specification of 100 nA @ 8V. This provides improved leakage performance for precision applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original MMSZ13T1 is RoHS non-compliant, making compliance upgrade a key benefit of substitution.

Q: Which substitute parts include automotive qualification?

A: SZMMSZ13ET1G, SZMMSZ13T1G, DDZ9700Q-7, and BZT52H-C13,115 all include AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What is the difference between SZMMSZ13ET1G and SZMMSZ13T1G?

A: Both parts are automotive-grade with AEC-Q101 qualification and identical electrical specifications. The primary difference is base product designation (SZMMSZ13 versus SZMMSZ13). Both are active products with ROHS3 compliance. SZMMSZ13T1G has higher inventory availability (95,100 units versus 39,100 units).

Q: Can I use BZT52H-C13,115 if my PCB is designed for SOD-123?

A: No. BZT52H-C13,115 uses SOD-123F package, which has different mechanical dimensions than SOD-123. PCB footprint modification is required. Use standard SOD-123 package alternatives if footprint change is not acceptable.

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