SMAZ24-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ24-13 is a 24 V, 1 W surface mount zener diode manufactured by Diodes Incorporated in the DO-214AC (SMA) package. This component is designed for voltage regulation and protection applications requiring precise 24 V reference voltage with ±5% tolerance. The SMAZ24-13 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±5	%
Power - Max	1	W
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 18.2 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the SMAZ24-13 is determined by the following critical parameters: nominal zener voltage (24 V), voltage tolerance (±5%), maximum power dissipation (1 W minimum), surface mount package compatibility (DO-214AC/SMA), and operating temperature range. Substitute parts are grouped into two categories:

Parametric Equivalents maintain all electrical specifications and operating conditions identical to the original part. These include SMAZ24-13-F (Diodes Incorporated) and SMAZ24-TP (Micro Commercial Co), both rated at 24 V, 1 W, with ±5% tolerance and -65°C to 150°C operating range.

Manufacturer Recommended Substitutes provide functional equivalence with minor parameter variations that do not affect circuit performance. These include 1SMA4749_R1_00001 (Panjit International Inc.), SMAJ4749A-TP (Micro Commercial Co), and SMAJ5934B-TP (Micro Commercial Co). All maintain 24 V nominal voltage and ±5% tolerance. Variations in impedance (15–25 Ohms), reverse leakage current (100 nA to 5 µA), and maximum power rating (1 W to 1.5 W) are within acceptable ranges for standard voltage regulation applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS Status	Product Status
SMAZ24-13	Diodes Incorporated	24 V	±5%	1 W	15 Ω	500 nA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	DO-214AC, SMA	Non-compliant	Discontinued
SMAZ24-13-F	Diodes Incorporated	24 V	±5%	1 W	15 Ω	500 nA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	DO-214AC, SMA	ROHS3 Compliant	Active
SMAZ24-TP	Micro Commercial Co	24 V	±5%	1 W	15 Ω	500 nA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	DO-214AC, SMA	ROHS3 Compliant	Active
1SMA4749_R1_00001	Panjit International Inc.	24 V	±5%	1 W	25 Ω	100 nA @ 18.2 V	Not specified	-55 to 150°C	DO-214AC, SMA	ROHS3 Compliant	Active
SMAJ4749A-TP	Micro Commercial Co	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 100 mA	-65 to 150°C	DO-214AC, SMA	ROHS3 Compliant	Active
SMAJ5934B-TP	Micro Commercial Co	24 V	±5%	1.5 W	19 Ω	500 nA @ 18.2 V	1.5 V @ 200 mA	-55 to 150°C	DO-214AC, SMA	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation: SMAZ24-13-F

The SMAZ24-13-F is the direct parametric equivalent manufactured by Diodes Incorporated. It provides identical electrical specifications to the original SMAZ24-13 while offering ROHS3 compliance and active product status. This part is the preferred choice for direct replacement in existing designs without circuit modification.

Secondary Recommendation: SMAZ24-TP

The SMAZ24-TP from Micro Commercial Co maintains identical electrical parameters and operating temperature range as the original part. It is ROHS3 compliant and actively manufactured, with substantial inventory availability (19,364 pcs). This part is suitable for applications where manufacturer substitution is acceptable.

Alternative Recommendations: 1SMA4749_R1_00001, SMAJ4749A-TP, SMAJ5934B-TP

These parts provide functional equivalence with acceptable parameter variations. The 1SMA4749_R1_00001 offers superior reverse leakage characteristics (100 nA). The SMAJ4749A-TP maintains full temperature range compatibility. The SMAJ5934B-TP provides increased power dissipation capability (1.5 W) for applications requiring additional thermal margin. All three are ROHS3 compliant and actively produced.

All substitute parts are REACH Unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can SMAZ24-13-F be used as a direct replacement for SMAZ24-13?

A: Yes. The SMAZ24-13-F is a parametric equivalent with identical voltage regulation (24 V ±5%), power rating (1 W), impedance (15 Ω), and operating temperature range (-65°C to 150°C). The primary difference is ROHS3 compliance and active product status. No circuit modifications are required.

Q: What is the difference between parametric equivalents and manufacturer recommended substitutes?

A: Parametric equivalents (SMAZ24-13-F, SMAZ24-TP) maintain all electrical specifications identical to the original part. Manufacturer recommended substitutes (1SMA4749_R1_00001, SMAJ4749A-TP, SMAJ5934B-TP) provide functional equivalence with minor variations in impedance, reverse leakage, or power rating that do not affect standard voltage regulation applications.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and soldering processes.

Q: What is the impact of impedance variation between substitute parts?

A: Impedance variations (15 Ω to 25 Ω) affect transient response characteristics. Lower impedance provides faster response to load changes. For standard voltage regulation applications, both values are acceptable. Applications requiring specific transient response should select parts with matching impedance to the original specification (15 Ω).

Q: Can SMAJ5934B-TP be used in place of SMAZ24-13?

A: Yes, with consideration for increased power rating. The SMAJ5934B-TP is rated at 1.5 W versus 1 W for the original part. This provides additional thermal margin and is suitable for applications where the original 1 W rating is marginal. The 24 V nominal voltage and ±5% tolerance remain identical.

Q: What is the minimum operating temperature for substitute parts?

A: Most substitute parts operate from -65°C to 150°C, matching the original specification. The 1SMA4749_R1_00001 and SMAJ5934B-TP have a minimum operating temperature of -55°C. For applications requiring -65°C operation, select SMAZ24-13-F, SMAZ24-TP, or SMAJ4749A-TP.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original SMAZ24-13 is RoHS non-compliant. Compliance is required for most modern applications and regulatory environments.

Q: What inventory availability should be considered for procurement?

A: SMAZ24-13-F offers the highest inventory (30,320 pcs), followed by SMAZ24-TP (19,364 pcs). These parts are recommended for applications with extended lead time requirements. Alternative parts (1SMA4749_R1_00001, SMAJ4749A-TP, SMAJ5934B-TP) have lower but adequate inventory levels (1,450 to 8,650 pcs).

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