SMAZ27-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ27-13 is a 27 V, 1 W surface mount zener diode manufactured by Diodes Incorporated in the DO-214AC (SMA) package. This component is used for voltage regulation and transient protection in electronic circuits. The SMAZ27-13 is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production requirements. Suitable alternatives maintain the core electrical specifications while offering improved availability and compliance status.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	15	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 20.5 V
Voltage - Forward (Maximum) @ 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

Substitute parts for the SMAZ27-13 are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Tolerance: ±5%
Package type: DO-214AC (SMA) surface mount
Operating temperature range: -65°C to 150°C minimum
Mounting type: Surface mount

Secondary Compatibility Factors:

Power dissipation capability: 1 W or greater
Impedance (Zzt): Maximum 15 Ohms or acceptable variance
Reverse leakage current: 500 nA @ 20.5 V or lower
Forward voltage: 1.2 V @ 200 mA or acceptable variance

Substitutes are grouped into two categories: direct equivalents (identical electrical specifications) and functional alternatives (enhanced specifications suitable for the same application).

Parameter Comparison

Parameter	SMAZ27-13	SMAZ27-13-F	1SMA5935BT3G	1SMA4750_R1_00001
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	Panjit International Inc.
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1.5 W	1 W
Impedance (Max)	15 Ohms	15 Ohms	23 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 20.5 V	500 nA @ 20.5 V	500 nA @ 20.6 V	100 nA @ 20.6 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA	Not specified
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SMAZ27-13-F (Diodes Incorporated)

This is the direct equivalent substitute for the SMAZ27-13. It maintains identical electrical specifications including 27 V zener voltage, 1 W power rating, 15 Ohms maximum impedance, and -65°C to 150°C operating temperature range. The SMAZ27-13-F is currently active in production with significantly higher inventory availability (30,300 pcs). It is ROHS3 compliant and available in Cut Tape and Digi-Reel packaging. This part is the primary recommendation for direct replacement in new designs and production restocking.

1SMA5935BT3G (onsemi)

This substitute provides enhanced power dissipation at 1.5 W compared to the original 1 W specification, while maintaining the 27 V zener voltage and ±5% tolerance. The impedance is 23 Ohms (higher than the original 15 Ohms) and forward voltage is 1.5 V @ 200 mA (higher than the original 1.2 V). Operating temperature range matches at -65°C to 150°C. This part is ROHS3 compliant and available in Tape & Reel packaging with high inventory (75,300 pcs). Selection of this part is appropriate for applications where increased power handling capability is beneficial or where impedance variance is acceptable.

1SMA4750_R1_00001 (Panjit International Inc.)

This substitute maintains the 27 V zener voltage, ±5% tolerance, and 1 W power rating. The impedance is 35 Ohms (significantly higher than the original 15 Ohms) and reverse leakage current is lower at 100 nA @ 20.6 V. Operating temperature range is -55°C to 150°C (minimum temperature is -55°C rather than -65°C). This part is ROHS3 compliant and available in Tape & Reel packaging. Selection of this part is appropriate for applications where lower leakage current is required and the reduced low-temperature operating range is acceptable.

Frequently Asked Questions (FAQ)

Q: Can SMAZ27-13-F be used as a direct replacement for SMAZ27-13?

A: Yes. The SMAZ27-13-F is a direct equivalent with identical electrical specifications: 27 V zener voltage, ±5% tolerance, 1 W power rating, 15 Ohms maximum impedance, and -65°C to 150°C operating temperature. Both use the DO-214AC (SMA) surface mount package. The primary difference is product status: SMAZ27-13-F is active in production while SMAZ27-13 is discontinued.

Q: What are the differences between SMAZ27-13 and 1SMA5935BT3G?

A: Both parts share the same 27 V zener voltage, ±5% tolerance, and -65°C to 150°C operating temperature range in DO-214AC (SMA) packages. The 1SMA5935BT3G has a higher power rating (1.5 W vs. 1 W), higher impedance (23 Ohms vs. 15 Ohms), and higher forward voltage (1.5 V vs. 1.2 V @ 200 mA). The 1SMA5935BT3G is suitable for applications requiring greater power dissipation capability.

Q: What are the differences between SMAZ27-13 and 1SMA4750_R1_00001?

A: Both parts share the same 27 V zener voltage, ±5% tolerance, and 1 W power rating in DO-214AC (SMA) packages. The 1SMA4750_R1_00001 has higher impedance (35 Ohms vs. 15 Ohms), lower reverse leakage current (100 nA vs. 500 nA @ 20.6 V), and a reduced low-temperature operating range (-55°C to 150°C vs. -65°C to 150°C). The 1SMA4750_R1_00001 is suitable for applications where lower leakage current is critical and the higher minimum operating temperature is acceptable.

Q: Are all substitute parts RoHS compliant?

A: The original SMAZ27-13 is RoHS non-compliant. All three substitute parts (SMAZ27-13-F, 1SMA5935BT3G, and 1SMA4750_R1_00001) are ROHS3 compliant. If RoHS compliance is required for your application, any of the three substitutes is suitable.

Q: Do all parts use the same package?

A: Yes. The SMAZ27-13 and all three substitute parts use the DO-214AC (SMA) surface mount package. They are mechanically and electrically compatible for PCB assembly without layout modifications.

Q: Which substitute has the best availability?

A: The 1SMA5935BT3G has the highest inventory at 75,300 pcs. The SMAZ27-13-F has 30,300 pcs available. The 1SMA4750_R1_00001 has 3,469 pcs available. Availability should be verified at the time of procurement.

Q: Can I use 1SMA5935BT3G in a circuit designed for SMAZ27-13?

A: The 1SMA5935BT3G can be used in most applications designed for SMAZ27-13 due to matching zener voltage and operating temperature range. However, the higher impedance (23 Ohms vs. 15 Ohms) and higher forward voltage (1.5 V vs. 1.2 V) may affect circuit performance in applications with tight voltage regulation requirements or high-frequency transient suppression. Circuit validation is necessary for critical applications.

Q: Can I use 1SMA4750_R1_00001 in a circuit designed for SMAZ27-13?

A: The 1SMA4750_R1_00001 can be used in most applications designed for SMAZ27-13 due to matching zener voltage and power rating. However, the significantly higher impedance (35 Ohms vs. 15 Ohms) and reduced low-temperature operating range (-55°C vs. -65°C minimum) may affect circuit performance. Applications requiring operation below -55°C or precise voltage regulation are not suitable for this substitute.

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