1SMA110Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA110Z is an active surface mount zener diode manufactured by Taiwan Semiconductor Corporation, rated for 110 V nominal zener voltage and 1.25 W maximum power dissipation in a DO-214AC (SMA) package. This component is used in voltage regulation and protection circuits requiring precise voltage clamping at 110 V. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, inventory constraints, or design flexibility within specified parameter tolerances.

Substiute Parts

1SMA110Z

Taiwan Semiconductor CorporationIn Stock: 22081SMA110Z Datasheet

Current PartRFQ

3SMAJ5950B-TP

Micro Commercial CoIn Stock: 299063SMAJ5950B-TP Datasheet

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3SMAJ5951B-TP

Micro Commercial CoIn Stock: 149883SMAJ5951B-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA110Z are identified based on the following critical parameters:

Primary Substitution Criteria:

• Zener voltage rating within ±5% tolerance band
• Package compatibility (DO-214AC / SMA surface mount)
• Maximum power rating equal to or greater than the original specification
• Reverse leakage current specification at rated voltage
• Operating temperature range coverage
• RoHS3 compliance and regulatory alignment

Substitution Logic:

The 3SMAJ5950B-TP maintains identical zener voltage (110 V) and tolerance (±5%), with increased power rating (3 W versus 1.25 W) and improved impedance characteristics (300 Ohms versus 450 Ohms). This part is a direct functional upgrade within the same voltage class.

The 3SMAJ5951B-TP operates at 120 V nominal zener voltage, representing a 10 V offset from the original specification. This part is suitable only in applications where the 110 V ±5% tolerance band (104.5 V to 115.5 V) does not overlap with the required operating voltage window, or where 120 V regulation is acceptable within circuit design margins.

Parameter Comparison

Engineering Selection Recommendations

1SMA110Z to 3SMAJ5950B-TP Substitution:

This substitution is valid for applications requiring 110 V zener regulation. The 3SMAJ5950B-TP provides superior power handling (3 W versus 1.25 W) and lower impedance (300 Ohms versus 450 Ohms), resulting in improved voltage regulation stability and reduced temperature coefficient effects. Both parts maintain ROHS3 compliance and identical zener voltage specification. The reduced maximum operating temperature (150°C versus 175°C) must be evaluated against circuit thermal design requirements.

1SMA110Z to 3SMAJ5951B-TP Substitution:

This substitution applies only to circuits where 120 V zener voltage is functionally equivalent to 110 V operation. The 10 V voltage offset places this part outside the original ±5% tolerance band. Selection of this part requires confirmation that the application circuit tolerates the higher regulation voltage or that 120 V operation is the intended design specification. Both parts maintain ROHS3 compliance and equivalent reverse leakage characteristics.

Regulatory and Compliance Alignment:

All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.10.0050. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can the 3SMAJ5950B-TP directly replace the 1SMA110Z in all applications?

A: The 3SMAJ5950B-TP is a direct functional replacement for the 1SMA110Z in applications requiring 110 V zener voltage regulation. Both parts maintain identical nominal zener voltage (110 V) and tolerance (±5%). The 3SMAJ5950B-TP offers increased power dissipation capability (3 W versus 1.25 W) and lower impedance (300 Ohms versus 450 Ohms). The maximum operating temperature specification is reduced from 175°C to 150°C; circuit thermal analysis must confirm this does not exceed design limits.

Q: What is the voltage difference between the 1SMA110Z and 3SMAJ5951B-TP?

A: The 1SMA110Z operates at 110 V nominal zener voltage with ±5% tolerance (104.5 V to 115.5 V operating band). The 3SMAJ5951B-TP operates at 120 V nominal zener voltage with ±5% tolerance (114 V to 126 V operating band). The 10 V offset between nominal ratings places these parts in different voltage classes. Substitution is valid only when circuit design specifications explicitly allow 120 V regulation or when the application voltage window accommodates this higher regulation point.

Q: Are all three parts packaged identically?

A: Yes. The 1SMA110Z, 3SMAJ5950B-TP, and 3SMAJ5951B-TP are all packaged in DO-214AC (SMA) surface mount configuration. All parts are supplied in Tape & Reel (TR) format. PCB footprint and reflow soldering profiles are identical across all three parts.

Q: What are the impedance differences, and why do they matter?

A: The 1SMA110Z specifies maximum impedance of 450 Ohms, while the 3SMAJ5950B-TP specifies 300 Ohms and the 3SMAJ5951B-TP specifies 380 Ohms. Lower impedance results in improved voltage regulation stability and reduced output impedance variation across the operating current range. The 3SMAJ5950B-TP provides the lowest impedance and therefore the best regulation performance.

Q: Do all parts meet the same regulatory requirements?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All parts carry identical HTSUS code 8541.10.0050 and moisture sensitivity level 1 (Unlimited). Regulatory and compliance status is equivalent across all parts.

Q: What is the reverse leakage current specification for each part?

A: The 1SMA110Z and 3SMAJ5950B-TP both specify 1 µA maximum reverse leakage current at 83.6 V. The 3SMAJ5951B-TP specifies 1 µA maximum reverse leakage current at 91.2 V (corresponding to its higher 120 V zener voltage rating). Reverse leakage current is measured at the reverse bias voltage point and is equivalent across all parts when normalized to their respective voltage ratings.

Q: Are there temperature range limitations when substituting parts?

A: The 1SMA110Z operates across -55°C to 175°C. Both substitute parts (3SMAJ5950B-TP and 3SMAJ5951B-TP) operate across -55°C to 150°C. The 25°C reduction in maximum operating temperature must be evaluated against circuit thermal design. If the application circuit operates near or above 150°C, the 1SMA110Z is required to maintain the full specified temperature range.