SMAZ12-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ12-13 is a 12 V, 1 W surface mount zener diode manufactured by Diodes Incorporated in the DO-214AC (SMA) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement. The zener diode functions as a voltage regulation and transient protection device in electronic circuits, with specifications including ±5% voltage tolerance, 7 Ohms maximum impedance, and operation across -65°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	12	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	7	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 9.1 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	Non-compliant

Substitute Part Grouping Explanation

Substitution of the SMAZ12-13 zener diode is determined by the following critical parameters: nominal zener voltage (12 V), voltage tolerance (±5%), maximum power dissipation (1 W or higher), package type (DO-214AC/SMA surface mount), and operating temperature range compatibility. Substitute parts must maintain the 12 V zener voltage specification and ±5% tolerance to ensure circuit voltage regulation performance. Maximum power rating may be equal to or exceed 1 W without circuit impact. Impedance, reverse leakage current, and forward voltage characteristics must remain within acceptable ranges for the application. All substitute parts identified are surface mount components in the DO-214AC (SMA) package format.

The substitute parts are grouped into two categories:

Parametric Equivalents maintain identical or near-identical electrical characteristics to the original SMAZ12-13, including 1 W power rating and matching impedance specifications.

Manufacturer Recommended Substitutes provide equivalent zener voltage and tolerance with enhanced power ratings (1.25 W or 1.5 W) or improved compliance status, suitable for applications requiring higher thermal headroom or regulatory compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Voltage - Forward (Max) @ If	Operating Temperature	Package / Case	Product Status	RoHS Status
SMAZ12-13	Diodes Incorporated	12 V	±5%	1 W	7 Ohms	1 µA @ 9.1 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-214AC, SMA	Discontinued	Non-compliant
SMAZ12-13-F	Diodes Incorporated	12 V	±5%	1 W	7 Ohms	1 µA @ 9.1 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
1SMA4742	Taiwan Semiconductor Corporation	12 V	±5%	1.25 W	9 Ohms	1 µA @ 9.1 V	Not specified	-55°C ~ 175°C	DO-214AC, SMA	Active	ROHS3 Compliant
1SMA4742_R1_00001	Panjit International Inc.	12 V	±5%	1 W	9 Ohms	100 nA @ 9.1 V	Not specified	-55°C ~ 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ4742A-TP	Micro Commercial Co	12 V	±5%	1 W	9 Ohms	5 µA @ 9.1 V	1.2 V @ 100 mA	-65°C ~ 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ5927B-TP	Micro Commercial Co	12 V	±5%	1.5 W	6.5 Ohms	500 nA @ 9.1 V	1.5 V @ 200 mA	-55°C ~ 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAZ12-TP	Micro Commercial Co	12 V	±5%	1 W	7 Ohms	1 µA @ 9.1 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SMAZ12-13-F

The SMAZ12-13-F is the direct equivalent replacement for the discontinued SMAZ12-13. Manufactured by Diodes Incorporated, this part maintains identical electrical specifications including 12 V zener voltage, ±5% tolerance, 1 W power rating, 7 Ohms impedance, and -65°C to 150°C operating temperature range. The SMAZ12-13-F is currently active in production with ROHS3 compliance, addressing the regulatory limitation of the original part. This substitute provides pin-for-pin compatibility and requires no circuit redesign.

Secondary Recommendation: SMAZ12-TP

The SMAZ12-TP from Micro Commercial Co provides parametric equivalence to the SMAZ12-13 with identical electrical characteristics: 12 V zener voltage, ±5% tolerance, 1 W power rating, 7 Ohms impedance, and -65°C to 150°C operating temperature. This part is active in production with ROHS3 compliance and offers high inventory availability (67,161 pieces). The SMAZ12-TP is suitable for applications requiring direct electrical substitution without performance modification.

Alternative Recommendation for Enhanced Thermal Performance: 1SMA4742

The 1SMA4742 from Taiwan Semiconductor Corporation maintains the 12 V zener voltage and ±5% tolerance while providing increased power dissipation capability (1.25 W versus 1 W). This part is suitable for applications where thermal margin is beneficial. Operating temperature range extends to 175°C, providing enhanced high-temperature performance. Impedance increases to 9 Ohms, which may affect circuit response characteristics in sensitive applications.

Alternative Recommendation for Low Leakage Applications: 1SMA4742_R1_00001

The 1SMA4742_R1_00001 from Panjit International Inc. provides 12 V zener voltage with ±5% tolerance and significantly reduced reverse leakage current (100 nA versus 1 µA). This part is suitable for low-power or precision voltage reference applications where leakage current minimization is critical. Operating temperature range is -55°C to 150°C.

Alternative Recommendation for Higher Power Dissipation: SMAJ5927B-TP

The SMAJ5927B-TP from Micro Commercial Co provides 12 V zener voltage with ±5% tolerance and elevated power rating (1.5 W). This part is suitable for applications requiring higher transient energy absorption or continuous power dissipation. Impedance is reduced to 6.5 Ohms, providing improved voltage regulation characteristics. Forward voltage increases to 1.5 V at 200 mA, which may affect circuit biasing in sensitive applications.

Alternative Recommendation for Balanced Specifications: SMAJ4742A-TP

The SMAJ4742A-TP from Micro Commercial Co provides 12 V zener voltage with ±5% tolerance and 1 W power rating. This part maintains -65°C to 150°C operating temperature range matching the original SMAZ12-13. Impedance is 9 Ohms with reverse leakage of 5 µA at 9.1 V. This part is suitable for general-purpose voltage regulation applications.

All recommended substitutes are ROHS3 compliant and currently active in production, addressing the discontinued status and regulatory compliance limitations of the original SMAZ12-13.

Frequently Asked Questions (FAQ)

Q: Can SMAZ12-13-F be used as a direct replacement for SMAZ12-13?

A: Yes. The SMAZ12-13-F is manufactured by the same company (Diodes Incorporated) and maintains identical electrical specifications: 12 V zener voltage, ±5% tolerance, 1 W power rating, 7 Ohms impedance, and -65°C to 150°C operating temperature. The part is pin-for-pin compatible and requires no circuit modification.

Q: What is the difference between SMAZ12-TP and SMAZ12-13-F?

A: Both parts provide identical electrical specifications and are suitable direct replacements for SMAZ12-13. The primary difference is manufacturer: SMAZ12-13-F is from Diodes Incorporated (original manufacturer), while SMAZ12-TP is from Micro Commercial Co. SMAZ12-TP offers significantly higher inventory availability (67,161 pieces versus 45,200 pieces).

Q: Can I use 1SMA4742 (1.25 W) instead of SMAZ12-13 (1 W)?

A: Yes, with consideration of impedance change. The 1SMA4742 maintains 12 V zener voltage and ±5% tolerance but increases power rating to 1.25 W and impedance to 9 Ohms. The higher power rating provides additional thermal margin. The impedance increase from 7 Ohms to 9 Ohms may affect voltage regulation response in circuits sensitive to dynamic impedance characteristics.

Q: What is the advantage of 1SMA4742_R1_00001 over other substitutes?

A: The 1SMA4742_R1_00001 provides significantly reduced reverse leakage current (100 nA versus 1 µA in the original SMAZ12-13). This characteristic is beneficial in low-power applications, precision voltage reference circuits, and applications where leakage current minimization is critical for circuit performance.

Q: Is SMAJ5927B-TP suitable for all applications using SMAZ12-13?

A: The SMAJ5927B-TP is suitable for applications where higher power dissipation (1.5 W versus 1 W) is beneficial or required. However, the forward voltage increases to 1.5 V at 200 mA (compared to 1.2 V at 200 mA in SMAZ12-13), which may affect circuit biasing in sensitive applications. Verify forward voltage compatibility before substitution in precision circuits.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts are ROHS3 compliant. The original SMAZ12-13 is RoHS non-compliant. Substitution with any recommended part addresses regulatory compliance requirements.

Q: Do all substitute parts use the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, providing mechanical and electrical compatibility with the original SMAZ12-13. No PCB layout modification is required.

Q: What is the operating temperature range difference between substitutes?

A: The original SMAZ12-13 operates from -65°C to 150°C. Most substitutes maintain this range. The 1SMA4742 extends the upper limit to 175°C, providing enhanced high-temperature performance. The 1SMA4742_R1_00001 and SMAJ5927B-TP operate from -55°C to 150°C, reducing the lower temperature limit by 10°C. Verify temperature range compatibility with application requirements.

Q: Which substitute offers the best overall compatibility?

A: The SMAZ12-13-F offers the best overall compatibility as the direct equivalent from the original manufacturer (Diodes Incorporated) with identical specifications and active production status. For applications where manufacturer diversity is preferred, SMAZ12-TP from Micro Commercial Co provides identical electrical specifications with higher inventory availability.

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