NP0900SCT3G Equivalent & Substitute Parts

Part Overview

The NP0900SCT3G is a 75V off-state thyristor TVS diode in DO-214AA (SMB) surface mount package manufactured by onsemi. This component is rated for 100A peak pulse current (10/1000µs) and provides transient voltage suppression with a 98V breakover voltage and 4V on-state voltage. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	75	V
Voltage - Breakover	98	V
Voltage - On State	4	V
Current - Peak Pulse (10/1000µs)	100	A
Current - Hold (Ih)	150	mA
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Number of Elements	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the NP0900SCT3G is determined by the following critical parameters:

Voltage - Off State: Must be 75V (exact match required)
Voltage - Breakover: Must be within 95V–98V range
Current - Hold (Ih): Must be 150mA (exact match required)
Package / Case: Must be DO-214AA, SMB (exact match required)
Mounting Type: Must be Surface Mount (exact match required)
Number of Elements: Must be 1 (exact match required)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in peak pulse current ratings (8/20µs and 10/1000µs), on-state voltage, and capacitance are permissible within the scope of TVS thyristor substitution, provided the part maintains the specified off-state voltage, breakover voltage, hold current, and package configuration.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State (V)	Voltage - Breakover (V)	Voltage - On State (V)	Current - Peak Pulse 10/1000µs (A)	Current - Hold Ih (mA)	Package	Product Status
NP0900SCT3G	onsemi	75	98	4	100	150	DO-214AA, SMB	Obsolete
P0900SCLRP	Littelfuse	75	98	4	100	150	DO-214AA, SMB	Active
TB0900H-13-F	Diodes Incorporated	75	98	4.6	100	150	DO-214AA, SMB	Active
TB0900L-13-F	Diodes Incorporated	75	98	4.6	30	150	DO-214AA, SMB	Active
TB0900M-13	Diodes Incorporated	75	98	4.6	50	150	DO-214AA, SMB	Discontinued at DiGi Electronics
TISP4095H3BJR-S	Bourns Inc.	75	95	3	100	150	DO-214AA, SMB	Active
TISP4095M3BJR-S	Bourns Inc.	75	95	3	50	150	DO-214AA, SMB	Active
TISP5095H3BJR-S	Bourns Inc.	75	95	3	100	150	DO-214AA, SMB	Active

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): P0900SCLRP (Littelfuse) is the closest electrical and mechanical equivalent. It maintains identical off-state voltage (75V), breakover voltage (98V), on-state voltage (4V), and peak pulse current rating (100A at 10/1000µs). The part is active and RoHS3 compliant.

Secondary Substitutes (Functional Equivalents): TB0900H-13-F and TISP5095H3BJR-S both support 100A peak pulse current at 10/1000µs with identical off-state voltage and hold current. Both are active products with RoHS3 compliance. TB0900H-13-F has a slightly lower on-state voltage (4.6V vs. 4V). TISP5095H3BJR-S has a lower breakover voltage (95V vs. 98V) and higher capacitance (315pF vs. 122pF).

Lower Current Alternatives: TB0900L-13-F and TISP4095M3BJR-S are suitable for applications requiring reduced peak pulse current (30A and 50A respectively at 10/1000µs). Both maintain the 75V off-state voltage and 150mA hold current. These parts are active and RoHS3 compliant.

Avoid: TB0900M-13 is discontinued at DiGi Electronics and marked as non-RoHS compliant, making it unsuitable for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use P0900SCLRP as a direct replacement for NP0900SCT3G? A: Yes. P0900SCLRP matches all critical parameters: 75V off-state voltage, 98V breakover voltage, 4V on-state voltage, 100A peak pulse current (10/1000µs), 150mA hold current, and DO-214AA SMB package. It is an active product with RoHS3 compliance.

Q: What is the difference between the 8/20µs and 10/1000µs pulse current ratings? A: These represent different test pulse waveforms. The 10/1000µs rating is the standard for TVS thyristors and is the primary specification for substitution compatibility. The 8/20µs rating provides additional performance data but does not affect substitution eligibility.

Q: Can I use TISP5095H3BJR-S instead of NP0900SCT3G? A: Yes, with consideration of parameter differences. TISP5095H3BJR-S maintains the 75V off-state voltage, 150mA hold current, and 100A peak pulse current (10/1000µs). However, it has a lower breakover voltage (95V vs. 98V) and higher capacitance (315pF vs. 122pF). Verify that these differences are acceptable for your circuit design.

Q: Why should I avoid TB0900M-13? A: TB0900M-13 is discontinued at DiGi Electronics and does not comply with RoHS3 standards. For new designs and ongoing production, active and compliant alternatives are preferred.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitutes use DO-214AA (SMB) surface mount packaging and are compatible with existing PCB layouts designed for the NP0900SCT3G.

Q: What is the hold current (Ih) and why is it important for substitution? A: Hold current is the minimum current required to maintain the thyristor in the on-state. All listed substitutes maintain the 150mA hold current specification, ensuring consistent switching behavior and circuit performance.

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