SMAZ39-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ39-13 is a 39 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 a nominal zener voltage of 39 V with ±5% tolerance. The SMAZ39-13 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5	%
Power - Max	1	W
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 29.6 V	nA
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	V
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAZ39-13 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 39 V nominal
Tolerance: ±5%
Package: DO-214AC (SMA) surface mount
Mounting type: Surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (1 W minimum)
Impedance characteristics (40 Ohms nominal)
Reverse leakage current specifications
Operating temperature range (-65°C to 150°C minimum)
RoHS and REACH compliance status

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications) and Manufacturer Recommended Alternatives (functionally compatible with minor parameter variations). All listed substitutes maintain the 39 V zener voltage, ±5% tolerance, and DO-214AC package format required for direct replacement.

Parameter Comparison

Parameter	SMAZ39-13 (Diodes Inc.)	SMAZ39-13-F (Diodes Inc.)	SMAZ39-TP (MCC)	1SMA4754 (TSC)	1SMA4754_R1_00001 (Panjit)
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V	39 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1.25 W	1 W
Impedance (Max)	40 Ohms	40 Ohms	40 Ohms	60 Ohms	60 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 29.6 V	500 nA @ 29.6 V	500 nA @ 29.6 V	1 µA @ 29.7 V	100 nA @ 29.7 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	—	—
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-55 to 175°C	-55 to 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active

Engineering Selection Recommendations

SMAZ39-13-F (Diodes Incorporated)

The SMAZ39-13-F is the primary substitute for the discontinued SMAZ39-13. This part maintains identical electrical specifications including 39 V zener voltage, ±5% tolerance, 1 W power rating, 40 Ohms impedance, and -65°C to 150°C operating temperature range. The SMAZ39-13-F differs only in packaging format (Tape & Reel) and compliance status (ROHS3 Compliant versus non-compliant). With 30,520 units in stock and active product status, this component provides direct functional replacement with improved regulatory compliance.

SMAZ39-TP (Micro Commercial Co)

The SMAZ39-TP is a parametric equivalent offering identical electrical performance to the original SMAZ39-13. All critical parameters match: 39 V zener voltage, ±5% tolerance, 1 W power rating, 40 Ohms impedance, 500 nA reverse leakage, and -65°C to 150°C operating temperature. The SMAZ39-TP is supplied in Tape & Reel packaging with ROHS3 compliance and active product status. Inventory availability is 36,503 units.

1SMA4754 (Taiwan Semiconductor Corporation)

The 1SMA4754 is a manufacturer-recommended alternative with 39 V zener voltage and ±5% tolerance. This component features enhanced power dissipation (1.25 W versus 1 W) and extended operating temperature range (-55°C to 175°C). The impedance specification is 60 Ohms (versus 40 Ohms), and reverse leakage is specified at 1 µA @ 29.7 V. The 1SMA4754 is suitable for applications requiring higher thermal headroom or extended temperature operation. Product status is active with 55,800 units in stock.

1SMA4754_R1_00001 (Panjit International Inc.)

The 1SMA4754_R1_00001 is a manufacturer-recommended alternative manufactured by Panjit. This part maintains 39 V zener voltage, ±5% tolerance, and 1 W power rating. The impedance is specified at 60 Ohms with reverse leakage of 100 nA @ 29.7 V. Operating temperature range is -55°C to 150°C. This component is ROHS3 compliant with active product status and 4,060 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the SMAZ39-13-F directly replace the discontinued SMAZ39-13?

A: Yes. The SMAZ39-13-F maintains identical electrical specifications including 39 V zener voltage, ±5% tolerance, 1 W power rating, 40 Ohms impedance, and operating temperature range of -65°C to 150°C. The only differences are packaging format (Tape & Reel) and improved RoHS3 compliance status. Direct substitution is supported.

Q: What is the difference between SMAZ39-TP and SMAZ39-13-F?

A: Both components are parametric equivalents with identical electrical specifications. The primary difference is manufacturer: SMAZ39-TP is manufactured by Micro Commercial Co, while SMAZ39-13-F is manufactured by Diodes Incorporated. Both are supplied in Tape & Reel packaging with ROHS3 compliance and equivalent performance characteristics.

Q: When should the 1SMA4754 be selected instead of SMAZ39-13-F?

A: The 1SMA4754 should be selected when applications require higher power dissipation (1.25 W versus 1 W) or extended operating temperature range (-55°C to 175°C versus -65°C to 150°C). The 1SMA4754 impedance is 60 Ohms compared to 40 Ohms in the SMAZ39-13-F. These characteristics provide additional thermal margin and temperature flexibility for demanding applications.

Q: Are all substitute parts RoHS compliant?

A: The original SMAZ39-13 is RoHS non-compliant. All listed substitutes (SMAZ39-13-F, SMAZ39-TP, 1SMA4754, and 1SMA4754_R1_00001) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: What is the significance of the DO-214AC (SMA) package designation?

A: DO-214AC and SMA are equivalent package designations for surface mount zener diodes. All listed substitutes use this identical package format, ensuring mechanical and thermal compatibility with existing PCB layouts and reflow soldering processes. No board redesign is required.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode at specified current levels. The SMAZ39-13, SMAZ39-13-F, and SMAZ39-TP specify 40 Ohms impedance, while 1SMA4754 and 1SMA4754_R1_00001 specify 60 Ohms. Higher impedance results in slightly greater voltage variation across the zener with changing load current. For most voltage regulation applications, both values are acceptable; however, precision regulation circuits may require verification of impedance specifications.

Q: What is the difference between reverse leakage current specifications?

A: Reverse leakage current is the small current flowing through the zener diode when reverse biased below the zener voltage. The SMAZ39-13 specifies 500 nA @ 29.6 V, while 1SMA4754_R1_00001 specifies 100 nA @ 29.7 V and 1SMA4754 specifies 1 µA @ 29.7 V. Lower leakage current indicates better reverse blocking characteristics. For most applications, these differences are negligible; however, high-impedance circuits may benefit from lower leakage specifications.

Q: Is the extended temperature range of 1SMA4754 (-55°C to 175°C) necessary for standard applications?

A: The extended temperature range of 1SMA4754 is not required for standard applications operating within -65°C to 150°C. The SMAZ39-13-F and SMAZ39-TP maintain the original temperature specification. The 1SMA4754 extended range is beneficial only for applications with extreme ambient temperatures or high-power dissipation scenarios where junction temperature may exceed 150°C.

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