SA170AHB0G Equivalent & Substitute Parts

Part Overview

The SA170AHB0G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for transient overvoltage protection in electronic circuits. This component operates with a reverse standoff voltage of 170V and provides clamping at 275V maximum, with a peak pulse current rating of 100mA. The device is packaged in a DO-204AC (DO-15) axial through-hole configuration and meets automotive-grade specifications including AEC-Q101 qualification.

The SA170AHB0G is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure uninterrupted component availability for production and repair applications. Substitute parts must maintain identical electrical performance characteristics and package specifications to ensure direct compatibility in existing circuit designs.

Substiute Parts

SA170AHB0G

Taiwan Semiconductor CorporationIn Stock: 1079SA170AHB0G Datasheet

Current PartRFQ

SA170AHA0G

Taiwan Semiconductor CorporationIn Stock: 1067SA170AHA0G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA170AHB0G are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution logic requires that alternative components maintain:

Electrical Parameters:

• Reverse standoff voltage: 170V (typical)
• Breakdown voltage minimum: 189V
• Clamping voltage maximum at peak pulse current: 275V
• Peak pulse current rating: 100mA (10/1000µs waveform)
• Peak pulse power dissipation: 500W

Mechanical and Package Parameters:

• Package type: DO-204AC (DO-15) axial through-hole
• Mounting configuration: Through-hole
• Physical form factor: Axial leads

Compliance and Certification:

• Automotive grade classification
• AEC-Q101 qualification
• RoHS3 compliance
• Operating temperature range: -55°C to 175°C (TJ)

Only components meeting all of these criteria are classified as direct substitutes. Variations in any parameter disqualify a component from substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

The SA170AHA0G is a direct functional equivalent to the SA170AHB0G and serves as the primary substitute for this discontinued component. Both parts are manufactured by Taiwan Semiconductor Corporation within the SA series and share identical electrical specifications across all rated parameters.

Substitution Basis:

The SA170AHA0G maintains complete electrical equivalence with respect to voltage ratings (170V standoff, 189V breakdown minimum, 275V clamping maximum), current handling (100mA peak pulse), and power dissipation (500W peak pulse). Both components are packaged identically in DO-204AC (DO-15) axial through-hole configuration, enabling direct board-level substitution without circuit modification or PCB redesign.

Compliance and Certification Alignment:

Both the main part and substitute are automotive-grade components with AEC-Q101 qualification, ensuring compliance with automotive industry reliability and quality standards. Both maintain RoHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels (MSL 1 - Unlimited), confirming regulatory and environmental compatibility.

Availability Advantage:

The SA170AHA0G is currently in active production status with 968 units in stock, providing immediate availability compared to the discontinued SA170AHB0G. This active status ensures continued supply chain access for ongoing production requirements and future component replenishment.

Frequently Asked Questions (FAQ)

Q: Can the SA170AHA0G be used as a direct replacement for the SA170AHB0G without any circuit modifications?

A: Yes. The SA170AHA0G is electrically and mechanically identical to the SA170AHB0G across all specified parameters. Both components have identical voltage ratings, current ratings, power dissipation, operating temperature range, and package configuration. Direct substitution on the PCB is possible without circuit redesign.

Q: What is the difference between the SA170AHB0G and SA170AHA0G part numbers?

A: The part numbers differ only in the suffix designation (B versus A in the fifth position). Both components are manufactured by Taiwan Semiconductor Corporation within the SA170 base product series. The suffix variation reflects internal manufacturing or distribution coding but does not indicate functional or electrical differences. All specified electrical and mechanical parameters are identical.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SA170AHB0G and SA170AHA0G carry automotive-grade classification and hold AEC-Q101 qualification. This certification confirms compliance with automotive industry standards for reliability, quality, and performance under automotive operating conditions.

Q: What is the operating temperature range for these TVS diodes?

A: Both components operate across a junction temperature range of -55°C to 175°C (TJ). This range is suitable for automotive and industrial applications requiring extended temperature performance.

Q: Are these components RoHS compliant?

A: Yes. Both the SA170AHB0G and SA170AHA0G are RoHS3 compliant, confirming compliance with the Restriction of Hazardous Substances directive. Both components also maintain REACH unaffected status.

Q: What is the moisture sensitivity level (MSL) for these parts?

A: Both components have an MSL rating of 1 (Unlimited), indicating unlimited shelf life without moisture-related degradation concerns. No special moisture control measures are required during storage or handling.

Q: Can these TVS diodes be used in power line protection applications?

A: No. Both the SA170AHB0G and SA170AHA0G are not rated for power line protection applications. These components are designed for transient overvoltage suppression in low-voltage signal and control circuits.

Q: What is the peak pulse current rating, and what waveform does it reference?

A: Both components are rated for 100mA peak pulse current using a 10/1000µs waveform specification. This standard waveform defines the transient pulse characteristics used for TVS diode performance rating and testing.

Q: What is the clamping voltage at peak pulse current?

A: The maximum clamping voltage at peak pulse current (Ipp) is 275V for both components. This parameter defines the maximum voltage the TVS diode will allow across its terminals during a transient overvoltage event at the rated peak pulse current.