1SMA180Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA180Z is a surface mount zener diode rated at 180 V nominal zener voltage with 1.25 W maximum power dissipation in a DO-214AC (SMA) package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active product status and is ROHS3 compliant. The 1SMA180Z is supplied in Tape & Reel (TR) packaging with 684 pieces currently in stock.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, packaging format changes, or performance grade specifications. The parts listed below maintain electrical compatibility within the specified parameter tolerances while offering different packaging options or enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	180	V
Tolerance	±5%	%
Power - Max	1.25	W
Impedance (Max)	1200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 136.8 V
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	DO-214AC (SMA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 1SMA180Z are classified into two categories based on electrical parameter alignment and packaging format:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 180 V nominal zener voltage, ±5% tolerance, 1.25 W maximum power, 1200 Ohms maximum impedance, and -55°C to 175°C operating temperature range. These parts differ only in packaging format (Cut Tape versus Tape & Reel) or qualification grade. Parametric equivalents are direct functional replacements.

Similar Parts share the same nominal zener voltage (180 V) and package type (DO-214AC) but differ in power rating or other secondary parameters. The 3SMAJ5955B-TP operates at 3 W maximum power with reduced impedance (900 Ohms) and is manufactured by Micro Commercial Co rather than Taiwan Semiconductor Corporation.

Substitution eligibility is determined by:

Voltage - Zener (Nom): Must equal 180 V
Package / Case: Must be DO-214AC (SMA)
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -55°C to 175°C minimum
RoHS Status: Must maintain ROHS3 compliance

Parameter Comparison

Parameter	1SMA180Z	1PGSMA180Z R3G	1PGSMA180ZHR3G	3SMAJ5955B-TP
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Micro Commercial Co
Voltage - Zener (Nom)	180 V	180 V	180 V	180 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1.25 W	1.25 W	1.25 W	3 W
Impedance (Max)	1200 Ohms	1200 Ohms	1200 Ohms	900 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 136.8 V	1 µA @ 136.8 V	1 µA @ 136.8 V	1 µA @ 136.8 V
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active
Grade	Standard	Standard	Automotive	Standard
Qualification	Not specified	Not specified	AEC-Q101	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1PGSMA180Z R3G serves as a parametric equivalent with identical electrical specifications to the 1SMA180Z. The primary distinction is packaging format: this part is supplied in Cut Tape (CT) rather than Tape & Reel (TR). This substitute is appropriate for applications where bulk reel quantities are not required or where cut tape format aligns with assembly processes. Note that this part is discontinued at DiGi Electronics, which may impact long-term availability.

1PGSMA180ZHR3G is a parametric equivalent with automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel (TR) format. This part maintains identical electrical parameters to the 1SMA180Z and supports the full operating temperature range of -55°C to 175°C. The automotive qualification provides additional process and reliability assurance. This part is also discontinued at DiGi Electronics. Selection of this part is appropriate when automotive-grade components are specified or when enhanced qualification documentation is required.

3SMAJ5955B-TP is classified as a similar part rather than a parametric equivalent due to differences in power rating (3 W versus 1.25 W) and impedance (900 Ohms versus 1200 Ohms). The maximum operating temperature is reduced to 150°C, which does not support the full -55°C to 175°C range of the 1SMA180Z. This part is manufactured by Micro Commercial Co. Selection of this part is appropriate only when higher power dissipation capability is required and the reduced upper temperature limit is acceptable for the application. This part maintains Active product status.

For direct replacement applications requiring identical electrical performance, the 1PGSMA180Z R3G or 1PGSMA180ZHR3G are appropriate selections. For applications requiring higher power handling, the 3SMAJ5955B-TP provides increased thermal capability at the cost of reduced maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can the 1PGSMA180Z R3G be used as a direct replacement for the 1SMA180Z?

A: Yes. The 1PGSMA180Z R3G maintains identical electrical specifications: 180 V nominal zener voltage, ±5% tolerance, 1.25 W maximum power, 1200 Ohms maximum impedance, and -55°C to 175°C operating temperature range. The only difference is packaging format (Cut Tape versus Tape & Reel). Direct electrical substitution is valid.

Q: What is the difference between the 1PGSMA180Z R3G and 1PGSMA180ZHR3G?

A: Both parts are parametric equivalents with identical electrical specifications. The 1PGSMA180ZHR3G includes automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel format, while the 1PGSMA180Z R3G is supplied in Cut Tape format. The automotive qualification provides additional process documentation and reliability assurance for automotive applications.

Q: Can the 3SMAJ5955B-TP replace the 1SMA180Z in all applications?

A: The 3SMAJ5955B-TP shares the same nominal zener voltage (180 V) and package type (DO-214AC) but differs in power rating (3 W versus 1.25 W), impedance (900 Ohms versus 1200 Ohms), and maximum operating temperature (150°C versus 175°C). This part is suitable only for applications where the reduced upper temperature limit is acceptable and where higher power dissipation is beneficial or required.

Q: What packaging formats are available for 180 V zener diodes in DO-214AC?

A: The 1SMA180Z is supplied in Tape & Reel (TR) format. The 1PGSMA180Z R3G is supplied in Cut Tape (CT) format. The 1PGSMA180ZHR3G is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and quantity needs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 1SMA180Z, 1PGSMA180Z R3G, 1PGSMA180ZHR3G, and 3SMAJ5955B-TP are all ROHS3 compliant and REACH unaffected.

Q: What is the significance of the AEC-Q101 qualification on the 1PGSMA180ZHR3G?

A: AEC-Q101 is an automotive electronics qualification standard that specifies reliability and quality requirements for semiconductor components used in automotive applications. The 1PGSMA180ZHR3G meets this qualification, making it suitable for automotive-grade designs. The 1SMA180Z does not carry this qualification.

Q: Why is the impedance different on the 3SMAJ5955B-TP?

A: The 3SMAJ5955B-TP has a maximum impedance of 900 Ohms compared to 1200 Ohms on the 1SMA180Z. This difference is a result of the higher power rating (3 W versus 1.25 W) and different internal design of the Micro Commercial Co part. Lower impedance generally indicates better voltage regulation characteristics at higher currents.

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