SMAZ33-13 Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAZ33-13 is a 33 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 33 V with ±5% tolerance. The SMAZ33-13 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
Voltage - Zener (Nom)	33 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	15 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 25.1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C to 150°C
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMAZ33-13 is determined by the following critical parameters:

Electrical Parameters (Must Match or Exceed):

Zener voltage: 33 V nominal with ±5% tolerance
Power dissipation capability: minimum 1 W
Operating temperature range: -65°C to 150°C
Reverse leakage current: 500 nA @ 25.1 V
Forward voltage: 1.2 V @ 200 mA

Mechanical Parameters (Must Match):

Surface mount mounting type
DO-214AC / SMA package configuration
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are classified into two categories:

Parametric Equivalents: Parts with identical electrical specifications and package configuration, differing only in manufacturer or packaging format (tape & reel versus cut tape).

Direct Substitutes: Parts with superior electrical specifications (higher power rating or lower impedance) that maintain the same zener voltage and package, providing enhanced performance margin while remaining mechanically and electrically compatible.

Parameter Comparison

Parameter	SMAZ33-13	SMAZ33-13-F	1SMA5937BT3G	SMAZ33-TP
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	Micro Commercial Co
Voltage - Zener (Nom)	33 V	33 V	33 V	33 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1.5 W	1 W
Impedance (Max)	15 Ohms	15 Ohms	33 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 25.1 V	500 nA @ 25.1 V	500 nA @ 25.1 V	500 nA @ 25.1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Product Status	Discontinued	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SMAZ33-13-F (Diodes Incorporated): This part is the direct parametric equivalent of the SMAZ33-13, offering identical electrical specifications and package configuration. The primary distinction is product status: SMAZ33-13-F is active and ROHS3 compliant, whereas the original SMAZ33-13 is discontinued and non-compliant. SMAZ33-13-F is available in Cut Tape and Digi-Reel packaging formats. This part is the preferred direct replacement for applications requiring exact electrical and mechanical compatibility with active product support.

SMAZ33-TP (Micro Commercial Co): This part is a parametric equivalent with identical electrical specifications (33 V, 1 W, ±5%, 15 Ohms impedance, 1.2 V forward voltage). SMAZ33-TP is ROHS3 compliant and active. The packaging format differs (Tape & Reel versus the original cut tape configuration), but the DO-214AC / SMA package remains identical. This part provides equivalent performance with alternative supply chain sourcing.

1SMA5937BT3G (onsemi): This part provides enhanced electrical specifications with 1.5 W power rating (50% higher than the original 1 W specification) while maintaining the same 33 V zener voltage and ±5% tolerance. The impedance is 33 Ohms (versus 15 Ohms in the original), and forward voltage is 1.5 V @ 200 mA (versus 1.2 V). The package remains DO-214AC / SMA. This part is ROHS3 compliant and active. The higher power rating provides additional thermal margin for applications with variable load conditions, though the increased impedance and forward voltage must be evaluated against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAZ33-13-F be used as a direct replacement for SMAZ33-13?

A: Yes. SMAZ33-13-F is a parametric equivalent with identical electrical specifications (33 V, 1 W, ±5% tolerance, 15 Ohms impedance, 1.2 V forward voltage) and the same DO-214AC / SMA package. The primary differences are product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). Electrical and mechanical compatibility is complete.

Q: What is the difference between SMAZ33-TP and SMAZ33-13?

A: SMAZ33-TP and SMAZ33-13 are parametric equivalents with identical electrical specifications. Both are 33 V, 1 W zener diodes with ±5% tolerance, 15 Ohms impedance, and 1.2 V forward voltage. Both use the DO-214AC / SMA package. The differences are manufacturer (Micro Commercial Co versus Diodes Incorporated), packaging format (Tape & Reel versus cut tape), and product status (active versus discontinued). Electrical performance is equivalent.

Q: Can 1SMA5937BT3G replace SMAZ33-13 in all applications?

A: 1SMA5937BT3G maintains the same 33 V zener voltage and ±5% tolerance, and uses the same DO-214AC / SMA package. However, it has a higher power rating (1.5 W versus 1 W), higher impedance (33 Ohms versus 15 Ohms), and higher forward voltage (1.5 V versus 1.2 V). The higher power rating provides additional thermal capability. The increased impedance and forward voltage may affect circuit performance in applications with tight voltage regulation requirements. Circuit-level evaluation is necessary to confirm compatibility.

Q: Are all substitute parts RoHS compliant?

A: SMAZ33-13-F, 1SMA5937BT3G, and SMAZ33-TP are all ROHS3 compliant. The original SMAZ33-13 is RoHS non-compliant. All substitute parts meet current RoHS requirements.

Q: Do the substitute parts have the same package dimensions?

A: Yes. All substitute parts (SMAZ33-13-F, 1SMA5937BT3G, and SMAZ33-TP) use the DO-214AC / SMA package, which has identical physical dimensions and PCB footprint compatibility with the original SMAZ33-13. Packaging format (cut tape, tape & reel, or digi-reel) affects supply and handling but not component dimensions or mounting.

Q: What is the difference between impedance values in the substitute parts?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode at the specified test current. SMAZ33-13, SMAZ33-13-F, and SMAZ33-TP all have 15 Ohms impedance. 1SMA5937BT3G has 33 Ohms impedance. Lower impedance provides better voltage regulation under varying load conditions. Applications requiring tight voltage stability should prioritize parts with 15 Ohms impedance.

Q: Can these parts be used interchangeably in existing designs?

A: SMAZ33-13-F and SMAZ33-TP are direct parametric equivalents and can be used interchangeably with SMAZ33-13 without circuit modification. 1SMA5937BT3G has superior power rating but different impedance and forward voltage characteristics; circuit-level verification is required before substitution.

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