DDZX15-7 Equivalent & Substitute Parts

Part Overview

The DDZX15-7 is a Zener diode manufactured by Diodes Incorporated, rated at 15 V nominal with 300 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±3%	—
Power - Max	300	mW
Impedance (Max)	18	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 12 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

Substitute parts for the DDZX15-7 are grouped based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Voltage - Zener (Nom): 15 V (exact match required)
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Operating Temperature Range: -65°C to 150°C minimum
RoHS Status: ROHS3 Compliant

Secondary Tolerance Parameters:

Tolerance: ±1% to ±6% (tighter tolerances are acceptable substitutes)
Power - Max: 225 mW to 350 mW (equal or greater power rating acceptable)
Impedance (Max): 18 to 30 Ohms
Current - Reverse Leakage @ Vr: 50 to 100 nA

Substitutes are identified as parametric equivalents when all primary criteria are met and secondary parameters remain within acceptable engineering ranges for the application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	RoHS
DDZX15-7	Diodes Incorporated	15 V	±3%	300 mW	18 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3
DDZX15-13	Diodes Incorporated	15 V	±3%	300 mW	18 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3
BZX84-A15,215	Nexperia USA Inc.	15 V	±1%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84-B15,215	Nexperia USA Inc.	15 V	±2%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84-B15,235	Nexperia USA Inc.	15 V	±2%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84-C15,215	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84-C15,235	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84B15-TP	Micro Commercial Co	15 V	±2%	350 mW	30 Ω	900 mV @ 10 mA	-55 to 150°C	SOT-23	ROHS3
BZX84B15LT1G	onsemi	15 V	±2%	225 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3
BZX84C15 TR PBFREE	Central Semiconductor Corp	15 V	±5%	350 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23	ROHS3
BZX84C15-E3-08	Vishay General Semiconductor - Diodes Division	15 V	±6%	300 mW	30 Ω	900 mV @ 10 mA	-55 to 150°C	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Parametric Equivalent: DDZX15-13 (Diodes Incorporated) is a direct parametric equivalent to DDZX15-7. Both components share identical electrical specifications including 15 V nominal voltage, ±3% tolerance, 300 mW power rating, and 18 Ohms maximum impedance. Both are Active product status and ROHS3 compliant. This substitute is suitable for direct replacement in all applications.

Nexperia BZX84 Series (AEC-Q101 Automotive Grade): BZX84-A15,215, BZX84-B15,215, BZX84-B15,235, BZX84-C15,215, and BZX84-C15,235 are automotive-qualified alternatives with AEC-Q101 certification. These parts maintain the 15 V nominal voltage and -65°C to 150°C operating temperature range. Power dissipation is reduced to 250 mW, and impedance is increased to 30 Ohms. Tolerance varies from ±1% to ±5%. These substitutes are suitable for applications requiring automotive-grade qualification.

Higher Power Alternatives: BZX84B15-TP (Micro Commercial Co) and BZX84C15 TR PBFREE (Central Semiconductor Corp) offer increased power ratings of 350 mW, accommodating higher dissipation requirements. BZX84B15-TP operates from -55°C to 150°C. BZX84C15 TR PBFREE maintains the full -65°C to 150°C range. Both are ROHS3 compliant.

Lower Power Alternative: BZX84B15LT1G (onsemi) provides a 225 mW power rating with ±2% tolerance and maintains the full -65°C to 150°C operating range in SOT-23-3 package. This substitute is suitable for applications with reduced power dissipation requirements.

Vishay Alternative: BZX84C15-E3-08 (Vishay General Semiconductor - Diodes Division) matches the 300 mW power rating and SOT-23-3 package of the main part. Operating temperature range is -55°C to 150°C with ±6% tolerance. This substitute is ROHS3 compliant.

All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity, and surface mount configuration. Selection should be based on specific application requirements for power dissipation, tolerance, operating temperature range, and automotive qualification status.

Frequently Asked Questions (FAQ)

Q: Can DDZX15-13 be used as a direct replacement for DDZX15-7? A: Yes. DDZX15-13 is a parametric equivalent with identical electrical specifications: 15 V nominal voltage, ±3% tolerance, 300 mW power rating, 18 Ohms impedance, and -65°C to 150°C operating temperature. Both are manufactured by Diodes Incorporated and are ROHS3 compliant.

Q: What is the difference between the Nexperia BZX84 series substitutes? A: The Nexperia BZX84 series differs primarily in tolerance specification: BZX84-A15 is ±1%, BZX84-B15 is ±2%, and BZX84-C15 is ±5%. All maintain 15 V nominal voltage, 250 mW power rating, 30 Ohms impedance, and -65°C to 150°C operating temperature. All are AEC-Q101 automotive qualified.

Q: Can I use a lower power rated substitute like BZX84B15LT1G (225 mW) instead of DDZX15-7 (300 mW)? A: Lower power rated substitutes are suitable only if the application's actual power dissipation does not exceed the substitute's rating. BZX84B15LT1G is rated for 225 mW maximum. If the circuit requires 300 mW dissipation capability, this substitute is not appropriate.

Q: Can I use a higher power rated substitute like BZX84B15-TP (350 mW) instead of DDZX15-7 (300 mW)? A: Yes. Higher power rated substitutes are acceptable. BZX84B15-TP provides 350 mW capability, exceeding the 300 mW requirement. However, note that BZX84B15-TP operates from -55°C to 150°C, which has a reduced lower temperature limit compared to DDZX15-7 (-65°C to 150°C).

Q: Are all substitute parts in the same package? A: No. DDZX15-7 and DDZX15-13 use SOT-23-3 package. Most Nexperia parts use TO-236AB package. BZX84B15-TP and BZX84C15 TR PBFREE use SOT-23 package. BZX84B15LT1G uses SOT-23-3 package. BZX84C15-E3-08 uses SOT-23-3 package. Verify package compatibility with your PCB layout before selection.

Q: What does AEC-Q101 qualification mean? A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Nexperia BZX84 series parts carry this certification, indicating they meet automotive reliability and quality requirements. This qualification is not present on the main part DDZX15-7.

Q: Can I substitute DDZX15-7 with BZX84C15-E3-08 if my application requires -65°C operation? A: No. BZX84C15-E3-08 operates from -55°C to 150°C, which does not meet the -65°C lower temperature requirement. Use substitutes that maintain the full -65°C to 150°C range: DDZX15-13, BZX84-A15,215, BZX84-B15,215, BZX84-B15,235, BZX84-C15,215, BZX84-C15,235, BZX84B15LT1G, or BZX84C15 TR PBFREE.

Q: What is the significance of impedance (Zzt) differences between 18 Ohms and 30 Ohms? A: Impedance affects the dynamic resistance of the Zener diode at operating current. DDZX15-7 has 18 Ohms maximum impedance, while most substitutes have 30 Ohms. Lower impedance provides better voltage regulation at varying currents. If voltage regulation performance is critical, verify that the 30 Ohms impedance of substitute parts meets application requirements.

Q: Are all listed parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of DDZX15-7.

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