ZHCS350TC Schottky Diode 40V 350mA SOD-523 Equivalent & Substitute Parts

Part Overview

The ZHCS350TC is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40V DC reverse voltage and 350mA average rectified current in a surface mount SOD-523 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	350	mA
Voltage - Forward (Vf) (Max) @ If	810 mV @ 350 mA	mV @ mA
Reverse Recovery Time (trr)	1.6	ns
Current - Reverse Leakage @ Vr	12	µA @ 30 V
Capacitance @ Vr, F	6	pF @ 25V, 1MHz
Technology	Schottky	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	SC-79, SOD-523	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ZHCS350TC is determined by the following critical parameters: reverse voltage rating (40V maximum), average rectified current capacity, forward voltage characteristics, reverse recovery time, package form factor (SOD-523), and mounting technology (surface mount).

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents maintain the 40V reverse voltage and 350mA current rating with identical forward voltage and recovery characteristics. These parts are direct functional replacements with no circuit redesign required.

Category 2: Functional Substitutes maintain the 40V reverse voltage rating but operate at reduced current ratings (200mA, 250mA, or 120mA) or different package sizes. These parts are suitable for applications where the full 350mA current capacity is not required, or where alternative package geometries are acceptable. Substitutes with lower current ratings must be applied only in circuits where the maximum current demand does not exceed the substitute part's rating.

All substitute parts listed maintain SOD-523 package compatibility or are available in alternative surface mount packages. All parts are RoHS3 compliant and MSL 1 rated.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [mV]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Temp Junction (Max) [°C]
ZHCS350TC	Diodes Incorporated	40	350	810 @ 350 mA	1.6	12 @ 30 V	SOD-523	Obsolete	125
ZHCS350TA	Diodes Incorporated	40	350	810 @ 350 mA	1.6	12 @ 30 V	SOD-523	Active	125
1PS79SB30,115	Nexperia USA Inc.	40	200	600 @ 200 mA	—	500 nA @ 25 V	SOD-523	Active	150
1PS79SB30,135	Nexperia USA Inc.	40	200	600 @ 200 mA	—	500 nA @ 25 V	SOD-523	Active	150
1PS79SB40,115	Nexperia USA Inc.	40	120	1000 @ 40 mA	—	10 µA @ 40 V	SOD-523	Active	150
CDBP00340-G	Comchip Technology	30	30	370 @ 1 mA	—	500 nA @ 30 V	SOD-723	Active	125
NSR0240V2T1G	onsemi	40	250	700 @ 200 mA	3	10 µA @ 40 V	SOD-523	Active	150
NSR0240V2T5G	onsemi	40	250	700 @ 200 mA	3	10 µA @ 40 V	SOD-523	Active	150
NSR0340V2T1G	onsemi	40	250	510 @ 200 mA	5	6 µA @ 40 V	SOD-523	Active	150
NSR0340V2T5G	onsemi	40	250	510 @ 200 mA	5	6 µA @ 40 V	SOD-523	Active	150
PMEG4002EB,115	Nexperia USA Inc.	40	200	600 @ 200 mA	—	500 nA @ 25 V	SOD-523	Active	150

Engineering Selection Recommendations

Primary Equivalent Selection:

ZHCS350TA is the direct parametric equivalent to ZHCS350TC. Both parts are manufactured by Diodes Incorporated with identical electrical specifications: 40V reverse voltage, 350mA average rectified current, 810mV forward voltage at 350mA, and 1.6ns reverse recovery time. ZHCS350TA is classified as active product status with standard Cut Tape and Digi-Reel packaging options, providing immediate procurement availability. This part is the preferred replacement for direct substitution without circuit modification.

Secondary Equivalent Selection for Reduced Current Applications:

For applications where the full 350mA current capacity is not required, the following parts provide active product status with enhanced reliability features:

NSR0340V2T1G and NSR0340V2T5G (onsemi) operate at 250mA with superior forward voltage characteristics (510mV @ 200mA versus 810mV @ 350mA on the original part). These parts feature extended operating temperature range (-55°C to 150°C) and lower reverse leakage current (6µA @ 40V). Both are available in SOD-523 package with active product status.

NSR0240V2T1G and NSR0240V2T5G (onsemi) also operate at 250mA with 700mV forward voltage and 3ns reverse recovery time, providing fast recovery characteristics comparable to the original ZHCS350TC. Extended temperature range and active product status support long-term supply chain stability.

Reduced Current Alternatives:

1PS79SB30,115 and 1PS79SB30,135 (Nexperia) operate at 200mA with 600mV forward voltage and 150°C maximum junction temperature. These parts are suitable for applications with maximum current requirements below 200mA.

1PS79SB40,115 (Nexperia) operates at 120mA and includes AEC-Q100 automotive qualification, suitable for automotive-grade applications with lower current demands.

Not Recommended:

CDBP00340-G (Comchip Technology) operates at 30V reverse voltage and 30mA current, with SOD-723 package form factor. This part is not suitable as a substitute due to insufficient voltage rating and current capacity, and incompatible package geometry.

Frequently Asked Questions (FAQ)

Q: Can ZHCS350TA directly replace ZHCS350TC without circuit modification?

A: Yes. ZHCS350TA is a parametric equivalent with identical electrical specifications and SOD-523 package. No circuit redesign is required. The primary difference is product status: ZHCS350TC is obsolete while ZHCS350TA is active with established supply chain availability.

Q: What is the difference between NSR0240V2T1G and NSR0240V2T5G?

A: Both parts are electrically identical with 40V reverse voltage and 250mA current rating. The difference is packaging: NSR0240V2T1G is supplied in Cut Tape and Digi-Reel format, while NSR0240V2T5G is supplied in Tape & Reel format. Selection depends on procurement and assembly requirements.

Q: Can I use a 250mA rated diode in place of the 350mA ZHCS350TC?

A: Only if the circuit's maximum forward current does not exceed 250mA. The substitute part must be rated for the actual operating current in the application. Using an undersized diode in a circuit requiring 350mA will result in device failure.

Q: What is the advantage of NSR0340V2T1G over NSR0240V2T1G?

A: Both operate at 250mA and 40V. NSR0340V2T1G features lower forward voltage (510mV @ 200mA versus 700mV @ 200mA) and lower reverse leakage current (6µA @ 40V versus 10µA @ 40V), resulting in reduced power dissipation and improved efficiency. NSR0340V2T1G is the preferred choice for power-sensitive applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference maintain RoHS3 compliance and MSL 1 (unlimited moisture sensitivity level) rating, meeting environmental and reliability standards for commercial and industrial applications.

Q: Why is CDBP00340-G not recommended as a substitute?

A: CDBP00340-G operates at 30V maximum reverse voltage, which is insufficient for circuits designed for 40V operation. Additionally, the 30mA current rating is significantly below the 350mA requirement, and the SOD-723 package is incompatible with SOD-523 footprints. This part does not meet the electrical or mechanical requirements for substitution.

Q: What is the temperature operating range difference between ZHCS350TC and its substitutes?

A: ZHCS350TC and CDBP00340-G are rated to 125°C maximum junction temperature. All Nexperia and onsemi substitute parts are rated to 150°C maximum junction temperature, providing improved thermal margin and reliability in high-temperature environments.

Q: Can I use 1PS79SB40,115 in a general-purpose application?

A: 1PS79SB40,115 is suitable only for applications with maximum forward current not exceeding 120mA. This part includes AEC-Q100 automotive qualification, making it appropriate for automotive-grade designs. For non-automotive applications requiring higher current capacity, NSR0340V2T1G or NSR0240V2T1G are more suitable.

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