SMAZ20-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ20-13 is a 20 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 20 V zener voltage with ±5% tolerance. The SMAZ20-13 is 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
Voltage - Zener (Nom)	20 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	15 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 15.2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA

Substitute Part Grouping Explanation

Substitution of the SMAZ20-13 zener diode is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 20 V nominal
Tolerance: ±5%
Power dissipation: 1 W minimum
Package type: DO-214AC (SMA) surface mount
Operating temperature range: -65°C to 150°C minimum

Secondary Compatibility Factors:

Impedance (Zzt): 15 Ohms maximum
Reverse leakage current: 500 nA @ 15.2 V maximum
Forward voltage: 1.2 V @ 200 mA maximum

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (equivalent function with minor parameter variations within acceptable engineering tolerances).

Parameter Comparison

Parameter	SMAZ20-13	SMAZ20-13-F	SMAZ20-TP	1SMA4747_R1_00001	SMAJ5932B-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co	Panjit International Inc.	Micro Commercial Co
Voltage - Zener (Nom)	20 V	20 V	20 V	20 V	20 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W	1.5 W
Impedance (Max)	15 Ohms	15 Ohms	15 Ohms	22 Ohms	14 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 15.2 V	500 nA @ 15.2 V	500 nA @ 15.2 V	100 nA @ 15.2 V	500 nA @ 15.2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	Not specified	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Product Status	Discontinued	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent (Preferred):

SMAZ20-13-F (Diodes Incorporated) is the primary substitute for SMAZ20-13. This part maintains identical electrical specifications across all critical parameters: 20 V zener voltage, ±5% tolerance, 1 W power rating, 15 Ohms maximum impedance, and -65°C to 150°C operating temperature range. SMAZ20-13-F is currently in active production status with ROHS3 compliance, providing long-term availability and regulatory alignment. The only difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance.

SMAZ20-TP (Micro Commercial Co) is a secondary parametric equivalent offering identical electrical specifications and operating temperature range. This part is actively produced and ROHS3 compliant, with 23,606 units in stock.

Manufacturer-Recommended Alternatives:

1SMA4747_R1_00001 (Panjit International Inc.) is a functional equivalent with 20 V zener voltage and ±5% tolerance. This part exhibits lower reverse leakage current (100 nA versus 500 nA) and higher impedance (22 Ohms versus 15 Ohms). The operating temperature range is -55°C to 150°C, which is narrower at the lower end. This part is suitable for applications where lower leakage current is beneficial and the -55°C minimum temperature is acceptable.

SMAJ5932B-TP (Micro Commercial Co) is a higher-power alternative rated at 1.5 W versus 1 W. This part maintains 20 V zener voltage, ±5% tolerance, and DO-214AC packaging. The impedance is 14 Ohms (lower than the original 15 Ohms), and forward voltage is 1.5 V @ 200 mA (higher than the original 1.2 V). This part is suitable for applications requiring increased power dissipation capability. Operating temperature specification is listed as 150°C maximum without lower limit specification.

All substitute parts are ROHS3 compliant and maintain DO-214AC (SMA) package compatibility with the original SMAZ20-13.

Frequently Asked Questions (FAQ)

Q: Can SMAZ20-13-F be used as a direct replacement for SMAZ20-13?

A: Yes. SMAZ20-13-F is a parametric equivalent with identical electrical specifications. The difference is packaging format (Tape & Reel versus bulk). Both parts are DO-214AC (SMA) surface mount packages with identical pin configuration and footprint.

Q: What is the difference between SMAZ20-TP and SMAZ20-13-F?

A: Both parts are parametric equivalents with identical electrical specifications: 20 V zener voltage, ±5% tolerance, 1 W power rating, 15 Ohms impedance, and -65°C to 150°C operating temperature. The difference is manufacturer (Micro Commercial Co versus Diodes Incorporated). Both are ROHS3 compliant and actively produced.

Q: Why does 1SMA4747_R1_00001 have different impedance and leakage specifications?

A: 1SMA4747_R1_00001 is manufactured by Panjit International Inc. and exhibits different internal characteristics. The impedance is 22 Ohms (versus 15 Ohms) and reverse leakage is 100 nA (versus 500 nA). These variations are within acceptable engineering tolerances for 20 V zener diodes and do not prevent functional substitution. The lower leakage current may be advantageous in certain applications.

Q: When should SMAJ5932B-TP be selected instead of direct equivalents?

A: SMAJ5932B-TP should be selected when the application requires power dissipation greater than 1 W. This part is rated at 1.5 W and maintains 20 V zener voltage with ±5% tolerance. The higher power rating accommodates applications with higher current or duty cycle requirements. Note that forward voltage is 1.5 V @ 200 mA (higher than the original 1.2 V).

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (SMAZ20-13-F, SMAZ20-TP, 1SMA4747_R1_00001, and SMAJ5932B-TP) are ROHS3 compliant. The original SMAZ20-13 is RoHS non-compliant, making substitution necessary for applications requiring regulatory compliance.

Q: Do all substitute parts use the same DO-214AC (SMA) package?

A: Yes. All substitute parts use DO-214AC (SMA) surface mount packaging with identical footprint and pin configuration. Direct PCB substitution is possible without layout modifications.

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

A: SMAZ20-13-F and SMAZ20-TP both operate from -65°C to 150°C, matching the original SMAZ20-13. 1SMA4747_R1_00001 operates from -55°C to 150°C (5°C higher minimum). SMAJ5932B-TP specifies 150°C maximum without a defined lower limit. Applications requiring operation below -55°C should use SMAZ20-13-F or SMAZ20-TP.

Q: Is inventory availability a factor in part selection?

A: Inventory levels vary by part and supplier. SMAZ20-TP has the highest inventory (23,606 units), followed by SMAZ20-13-F (25,200 units). 1SMA4747_R1_00001 has 2,495 units, and SMAJ5932B-TP has 8,088 units. Availability should be confirmed with the specific supplier for production requirements.

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