DDZX13B-7 Equivalent & Substitute Parts

Part Overview

The DDZX13B-7 is a Zener diode manufactured by Diodes Incorporated, rated at 13 V nominal with 300 mW maximum power dissipation in a surface mount SOT-23-3 package. The device is Active product status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility across qualified component sources.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±3%	—
Power - Max	300	mW
Impedance (Max)	14	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 10 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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DDZX13B-7 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 13 V (exact match required)
Operating Temperature Range: -65°C to 150°C (minimum requirement)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (maximum)
Current - Reverse Leakage @ Vr: 100 nA or lower at specified reverse voltage

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, or SOT-23-3 (all equivalent designations for the same physical package)
Supplier Device Package: SOT-23-3 or TO-236AB (compatible footprints)

Compliance Criteria:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts may vary in the following parameters within acceptable engineering limits:

Tolerance: ±1% to ±6% (tighter tolerance acceptable; looser tolerance acceptable depending on circuit requirements)
Power - Max: 225 mW to 300 mW (lower power rating acceptable if circuit current demands are met)
Impedance (Max): 13 to 30 Ohms (variation acceptable within zener diode specifications)
Current - Reverse Leakage @ Vr: 100 nA to 500 nA (minor variation acceptable)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Tolerance	Power - Max (mW)	Impedance (Max) (Ohms)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature (°C)	Package / Case	RoHS Status
DDZX13B-7	Diodes Incorporated	13	±3%	300	14	100 nA @ 10 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
DDZX13B-13	Diodes Incorporated	13	±3%	300	14	100 nA @ 10 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84-A13,215	Nexperia USA Inc.	13	±1%	250	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84-B13,215	Nexperia USA Inc.	13	±2%	250	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84-B13,235	Nexperia USA Inc.	13	±2%	250	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84-C13,215	Nexperia USA Inc.	13	±5%	250	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84-C13,235	NXP Semiconductors	13	±5%	250	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
BZX84C13LT1G	onsemi	13	±6%	225	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
MMBZ5243BLT1G	onsemi	13	±5%	225	13	500 nA @ 9.9 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant
SZBZX84C13ET1G	onsemi	13	±6%	225	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	TO-236-3, SC-59, SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (Direct Substitution):

DDZX13B-13 is a parametric equivalent to DDZX13B-7. Both parts are manufactured by Diodes Incorporated with identical electrical specifications (13 V, ±3%, 300 mW, 14 Ohms impedance) and package configuration. Selection between these two part numbers is based on inventory availability and packaging format (Tape & Reel).

Manufacturer Recommended Substitutes (Nexperia/NXP BZX84 Series):

The BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, and BZX84-C13,215 series from Nexperia USA Inc. and NXP Semiconductors are qualified substitutes. These parts maintain the 13 V zener voltage and SOT-23-3 package compatibility. Key differences include:

BZX84-A13,215: ±1% tolerance, 250 mW power rating, AEC-Q101 automotive qualification
BZX84-B13,215 and BZX84-B13,235: ±2% tolerance, 250 mW power rating, AEC-Q101 automotive qualification
BZX84-C13,215 and BZX84-C13,235: ±5% tolerance, 250 mW power rating, AEC-Q101 automotive qualification

All BZX84 variants feature 30 Ohms maximum impedance and are suitable for applications where the lower power rating (250 mW versus 300 mW) is acceptable.

Manufacturer Recommended Substitutes (onsemi Series):

BZX84C13LT1G, MMBZ5243BLT1G, and SZBZX84C13ET1G from onsemi are qualified substitutes with 13 V zener voltage and SOT-23-3 package compatibility. These parts feature reduced power ratings (225 mW) and are suitable for applications where thermal dissipation is less demanding. SZBZX84C13ET1G includes AEC-Q101 automotive qualification.

Compliance and Availability:

All substitute parts listed are ROHS3 compliant, MSL 1 (Unlimited), and Active product status. Selection should prioritize parts with the highest inventory availability and shortest lead times for the specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can DDZX13B-13 be used as a direct replacement for DDZX13B-7?

A: Yes. DDZX13B-13 is a parametric equivalent with identical electrical specifications and package configuration. Both are manufactured by Diodes Incorporated with 13 V nominal voltage, ±3% tolerance, 300 mW power rating, and SOT-23-3 package. Selection is based on inventory and packaging format availability.

Q: What is the primary difference between the DDZX13B-7 and BZX84 series substitutes?

A: The DDZX13B-7 provides 300 mW maximum power dissipation with 14 Ohms impedance. BZX84 series parts provide 250 mW maximum power dissipation with 30 Ohms impedance. Both maintain 13 V nominal zener voltage and SOT-23-3 package compatibility. The BZX84 series is suitable when circuit current demands do not exceed 250 mW thermal limits.

Q: Are onsemi BZX84C13LT1G and MMBZ5243BLT1G suitable for high-current applications?

A: Both parts are rated at 225 mW maximum power dissipation, which is lower than the DDZX13B-7 (300 mW). These parts are suitable for applications where circuit current demands remain within the 225 mW thermal envelope. MMBZ5243BLT1G features 13 Ohms impedance compared to 30 Ohms for BZX84C13LT1G, providing lower dynamic impedance characteristics.

Q: Do all substitute parts use the same SOT-23-3 package footprint?

A: Yes. All listed substitute parts use SOT-23-3 package designation (also referenced as TO-236-3 or SC-59). The physical footprint and pin configuration are identical, enabling direct PCB layout compatibility without redesign.

Q: Which substitute parts include automotive qualification?

A: BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235, and SZBZX84C13ET1G include AEC-Q101 automotive qualification. These parts are suitable for automotive and high-reliability applications.

Q: What tolerance range should be considered when selecting a substitute?

A: The DDZX13B-7 specifies ±3% tolerance. Substitute parts with tighter tolerance (±1% or ±2%) provide improved voltage regulation accuracy. Substitute parts with looser tolerance (±5% or ±6%) are acceptable for applications where voltage regulation tolerance is not critical. Circuit design requirements determine the acceptable tolerance range.

Q: Is there a performance difference between Nexperia and onsemi 13 V zener diodes?

A: Both manufacturers provide 13 V zener diodes in SOT-23-3 packages with compatible electrical characteristics. Nexperia BZX84 series provides 250 mW power rating with 30 Ohms impedance. onsemi BZX84C13LT1G and SZBZX84C13ET1G provide 225 mW power rating with 30 Ohms impedance. onsemi MMBZ5243BLT1G provides 225 mW power rating with 13 Ohms impedance. Selection is based on specific circuit power and impedance requirements.

Q: Can DDZX13B-7 be substituted with lower power-rated parts in existing designs?

A: Substitution with lower power-rated parts (250 mW or 225 mW) is acceptable only if circuit analysis confirms that maximum zener current remains within the lower power rating. Thermal analysis must verify that the substitute part does not exceed its maximum junction temperature under worst-case operating conditions.

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