DDZX43-13 Equivalent & Substitute Parts

Part Overview

The DDZX43-13 is a Zener diode rated at 43 V nominal voltage with 300 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by Diodes Incorporated, this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute components must maintain electrical equivalence across critical parameters including zener voltage, power rating, and thermal operating range while accommodating packaging and tolerance variations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±2%	-
Power - Max	300	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 33 V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature Range	-65°C 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 DDZX43-13 is determined by electrical and mechanical parameter equivalence. The critical parameters governing substitution are:

Electrical Parameters:

Zener voltage: 43 V nominal
Power dissipation capability: minimum 300 mW
Operating temperature range: -65°C to 150°C
Forward voltage and reverse leakage characteristics

Mechanical Parameters:

Surface mount package compatibility: SOT-23-3 / TO-236-3 / SC-59
Moisture sensitivity level: MSL 1 or better
RoHS compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Parametric Equivalent: DDZX43-7 maintains identical electrical specifications and differs only in packaging format (Tape & Reel versus standard packaging). This part is manufactured by the same supplier and carries active product status.

Manufacturer Recommended Equivalent: BZX84-A43,215 from NXP Semiconductors provides electrical substitution with minor parameter variations. This part features reduced power rating (250 mW versus 300 mW) and improved tolerance (±1% versus ±2%), with automotive qualification and AEC-Q101 certification.

Parameter Comparison

Parameter	DDZX43-13	DDZX43-7	BZX84-A43,215
Manufacturer	Diodes Incorporated	Diodes Incorporated	NXP Semiconductors
Product Status	Obsolete	Active	Active
Voltage - Zener (Nom)	43 V	43 V	43 V
Tolerance	±2%	±2%	±1%
Power - Max	300 mW	300 mW	250 mW
Impedance (Max)	90 Ohms	90 Ohms	150 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 33 V	50 nA @ 33 V	50 nA @ 30.1 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Qualification	-	-	AEC-Q101

Engineering Selection Recommendations

DDZX43-7 Selection Criteria:

The DDZX43-7 is the primary substitute for DDZX43-13 applications. This part maintains complete electrical and mechanical equivalence with identical zener voltage (43 V), power rating (300 mW), impedance (90 Ohms), and tolerance (±2%). Both components are manufactured by Diodes Incorporated and share the same base product number (DDZX43). The DDZX43-7 carries active product status, ensuring long-term availability and supply chain continuity. The only distinction is packaging format: DDZX43-7 is supplied in Tape & Reel configuration. This part is suitable for direct replacement in all applications where DDZX43-13 was originally specified.

BZX84-A43,215 Selection Criteria:

The BZX84-A43,215 from NXP Semiconductors serves as an alternative substitute when DDZX43-7 availability is constrained. This part maintains the 43 V zener voltage and -65°C to 150°C operating range. Key differences include reduced maximum power dissipation (250 mW versus 300 mW), improved tolerance specification (±1% versus ±2%), and increased impedance (150 Ohms versus 90 Ohms). The BZX84-A43,215 carries AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications. Selection of this part requires confirmation that the 250 mW power rating is sufficient for the application circuit and that the higher impedance does not adversely affect circuit performance.

Frequently Asked Questions (FAQ)

Q: Can DDZX43-7 be used as a direct replacement for DDZX43-13?

A: Yes. The DDZX43-7 provides complete electrical and mechanical equivalence. Both parts share identical zener voltage (43 V), power rating (300 mW), impedance (90 Ohms), tolerance (±2%), and operating temperature range (-65°C to 150°C). The SOT-23-3 package is identical. The only difference is packaging format (Tape & Reel for DDZX43-7). Direct substitution is applicable for all circuit applications.

Q: What are the limitations of using BZX84-A43,215 as a substitute?

A: The BZX84-A43,215 has two parameter differences: maximum power dissipation is reduced to 250 mW (from 300 mW), and impedance is increased to 150 Ohms (from 90 Ohms). Applications requiring the full 300 mW power dissipation capability or those sensitive to impedance variations must be evaluated. The higher impedance may affect transient response characteristics in some circuit topologies. Confirmation of circuit compatibility is necessary before selection.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the SOT-23-3 package (also designated TO-236-3 or SC-59). PCB footprints are identical, and no layout modifications are required for substitution.

Q: What is the significance of the ±1% tolerance on BZX84-A43,215 compared to ±2% on DDZX43-13?

A: The ±1% tolerance on BZX84-A43,215 provides tighter zener voltage control, resulting in more precise voltage regulation. This is advantageous in applications requiring strict voltage accuracy. However, if the original design was validated with ±2% tolerance, the improved tolerance of the substitute does not create compatibility issues.

Q: Does the BZX84-A43,215 AEC-Q101 qualification affect its use in non-automotive applications?

A: No. AEC-Q101 qualification indicates the part meets automotive reliability standards and is suitable for automotive use. This qualification does not restrict use in non-automotive applications. The part remains fully compatible with standard industrial and consumer applications.

Q: What is the impact of the 50 nA reverse leakage specification difference between DDZX43-13 and BZX84-A43,215?

A: Both parts specify 50 nA reverse leakage current. The DDZX43-13 specifies this at 33 V, while BZX84-A43,215 specifies it at 30.1 V. This minor measurement condition difference does not affect practical circuit performance. Reverse leakage characteristics are equivalent for circuit design purposes.

Q: Is RoHS compliance maintained across all substitute parts?

A: DDZX43-13 and DDZX43-7 are both ROHS3 Compliant. RoHS status is not specified for BZX84-A43,215 in the provided data. Confirmation of RoHS compliance for BZX84-A43,215 is required if RoHS certification is a design requirement.

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