DDZX14-7 Equivalent & Substitute Parts

Part Overview

The DDZX14-7 is a 14 V Zener diode rated at 300 mW with ±3% tolerance, manufactured by Diodes Incorporated in SOT-23-3 surface mount packaging. This component is classified as Active and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters. Alternative components may be required due to inventory availability, lead time considerations, or specific application requirements while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	14	V
Tolerance	±3%	-
Power - Max	300	mW
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 11 V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature Range	-65°C to 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SOT-23-3 (TO-236-3, SC-59)	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the DDZX14-7 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 14 V nominal
Package type: SOT-23-3 surface mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance
Moisture Sensitivity Level: 1

Secondary Compatibility Factors:

Power dissipation rating (300 mW or higher)
Voltage tolerance (±3% or ±5%)
Impedance characteristics
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications (14 V, 300 mW, ±3% tolerance, 16 Ohms impedance).

Functional Substitutes: Parts with 14 V nominal voltage and SOT-23-3 packaging but with higher power ratings (350 mW) or lower power ratings (225 mW), different tolerance specifications (±5%), or alternative impedance values. These maintain functional compatibility within the specified operating parameters while offering different performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS
DDZX14-7	Diodes Incorporated	14 V	±3%	300 mW	16 Ω	50 nA @ 11 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3
MMBZ5244B-7-F	Diodes Incorporated	14 V	±5%	350 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3
DDZX14-13	Diodes Incorporated	14 V	±3%	300 mW	16 Ω	50 nA @ 11 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3
CMPZ5244B TR PBFREE	Central Semiconductor Corp	14 V	±5%	350 mW	13 Ω	100 nA @ 10 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3
MMBZ5244B-TP	Micro Commercial Co	14 V	±5%	350 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55°C to 150°C	SOT-23-3	ROHS3
MMBZ5244BLT1G	onsemi	14 V	±5%	225 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3
SZMMBZ5244BLT1G	onsemi	14 V	±5%	225 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Parametric Equivalent:

DDZX14-13 is a direct parametric equivalent to DDZX14-7, offering identical electrical specifications including 14 V nominal voltage, ±3% tolerance, 300 mW power rating, and 16 Ohms impedance. Both components share the same operating temperature range and SOT-23-3 packaging. This part is suitable for direct substitution without circuit redesign.

Manufacturer-Recommended Substitutes with Higher Power Rating:

MMBZ5244B-7-F (Diodes Incorporated), CMPZ5244B TR PBFREE (Central Semiconductor Corp), and MMBZ5244B-TP (Micro Commercial Co) are rated at 350 mW, providing 50 mW additional power dissipation capacity. These parts maintain 14 V nominal voltage and SOT-23-3 packaging. Tolerance is ±5% rather than ±3%. All three are ROHS3 compliant and operate within the -65°C to 150°C range (MMBZ5244B-TP operates from -55°C minimum). These substitutes are suitable for applications where higher power dissipation margin is beneficial.

Lower Power Rating Alternatives:

MMBZ5244BLT1G and SZMMBZ5244BLT1G (both onsemi) are rated at 225 mW, providing 75 mW less power dissipation than the DDZX14-7. Both maintain 14 V nominal voltage, ±5% tolerance, and SOT-23-3 packaging. SZMMBZ5244BLT1G includes AEC-Q101 automotive qualification. These parts are suitable for applications with lower power requirements or where space and thermal constraints favor reduced power dissipation.

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1, and forward voltage characteristics identical to the main part.

Frequently Asked Questions (FAQ)

Q: Can DDZX14-13 be used as a direct replacement for DDZX14-7?

A: Yes. DDZX14-13 is a parametric equivalent with identical specifications: 14 V nominal voltage, ±3% tolerance, 300 mW power rating, 16 Ohms impedance, and SOT-23-3 packaging. Direct substitution is supported without circuit modification.

Q: What is the difference between the 300 mW and 350 mW rated parts?

A: The 350 mW parts (MMBZ5244B-7-F, CMPZ5244B TR PBFREE, MMBZ5244B-TP) provide 50 mW additional power dissipation capacity compared to the 300 mW DDZX14-7. All maintain 14 V nominal voltage and SOT-23-3 packaging. The 350 mW parts have ±5% tolerance instead of ±3%. Selection depends on circuit power requirements and tolerance specifications.

Q: Are the 225 mW onsemi parts suitable substitutes?

A: MMBZ5244BLT1G and SZMMBZ5244BLT1G are suitable for applications with lower power dissipation requirements. Both maintain 14 V nominal voltage and SOT-23-3 packaging but are rated at 225 mW instead of 300 mW. Verify that circuit power requirements do not exceed 225 mW. SZMMBZ5244BLT1G includes AEC-Q101 automotive qualification.

Q: What is the significance of the ±5% tolerance in substitute parts?

A: The DDZX14-7 has ±3% tolerance, while most substitute parts have ±5% tolerance. This means substitute parts allow a wider voltage variation around the 14 V nominal specification. Applications requiring tighter voltage regulation should verify that ±5% tolerance is acceptable for the circuit design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and have Moisture Sensitivity Level 1 (Unlimited), matching the DDZX14-7 environmental specifications.

Q: What is the difference between MMBZ5244BLT1G and SZMMBZ5244BLT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications: 14 V, ±5% tolerance, 225 mW, SOT-23-3 packaging. SZMMBZ5244BLT1G includes AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging. MMBZ5244BLT1G is supplied in Cut Tape & Digi-Reel packaging. Selection depends on packaging requirements and automotive qualification needs.

Q: Does MMBZ5244B-TP have a different operating temperature range?

A: Yes. MMBZ5244B-TP operates from -55°C to 150°C, while DDZX14-7 operates from -65°C to 150°C. The MMBZ5244B-TP has a 10°C higher minimum operating temperature. Verify that the application does not require operation below -55°C before selecting this substitute.

Q: Can I use a higher power-rated part in place of the DDZX14-7?

A: Yes. The 350 mW parts (MMBZ5244B-7-F, CMPZ5244B TR PBFREE, MMBZ5244B-TP) can be used in applications designed for the 300 mW DDZX14-7. The higher power rating provides additional thermal margin. Verify that tolerance specifications (±5% vs. ±3%) are acceptable for the circuit design.

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