ZLLS400TC Equivalent & Substitute Parts

Part Overview

The ZLLS400TC is a Schottky diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 520 mA average rectified current in a surface mount SOD-323 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The ZLLS400TC features fast recovery characteristics with a 3 ns reverse recovery time, suitable for high-speed switching applications requiring low forward voltage drop.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	520 mA
Voltage - Forward (Vf) (Max) @ If	500 mV @ 400 mA
Reverse Recovery Time (trr)	3 ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 30 V
Capacitance @ Vr, F	15 pF @ 30V, 1MHz
Package / Case	SC-76, SOD-323
Operating Temperature - Junction (Max)	150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZLLS400TC is determined by strict electrical and mechanical compatibility across the following parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 520 mA
Package / Case: Must be SC-76, SOD-323 (surface mount)
Technology: Schottky diode
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Fast recovery characteristics preferred for switching applications
Forward Voltage (Vf): Lower values indicate improved efficiency
Operating Temperature Range: Must support 150°C junction temperature minimum
RoHS and Moisture Sensitivity: Compliance with ROHS3 and MSL-1 required

Substitute parts are grouped into two categories:

Parametric Equivalents (Diodes Incorporated ZLLS400 Series): Parts ZLLS400QTA, ZLLS400QTC, and ZLLS400TA match all electrical specifications of the ZLLS400TC with identical voltage, current, and recovery time ratings. These differ only in packaging format (Tape & Reel or Cut Tape) and product status (Active vs. Obsolete).

Manufacturer Recommended Alternatives: Parts from Nexperia USA Inc., STMicroelectronics, and onsemi provide functional substitution with trade-offs in current rating, forward voltage, or recovery time characteristics. These alternatives maintain the 40 V voltage rating and SOD-323 package but operate at reduced current levels (120 mA to 1 A) or with different speed classifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (mA)	Vf (Max) @ If	trr (ns)	Speed	Package	Tj (Max)	Product Status	Packaging Type
ZLLS400TC	Diodes Incorporated	40 V	520	500 mV @ 400 mA	3	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Obsolete	Tube
ZLLS400QTA	Diodes Incorporated	40 V	520	500 mV @ 400 mA	3	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Tape & Reel
ZLLS400QTC	Diodes Incorporated	40 V	520	500 mV @ 400 mA	3	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Tape & Reel
ZLLS400TA	Diodes Incorporated	40 V	520	500 mV @ 400 mA	3	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Cut Tape & Digi-Reel
1PS76SB21,115	Nexperia USA Inc.	40 V	200	550 mV @ 200 mA	N/A	Small Signal ≤ 200mA, Any Speed	SOD-323	125°C	Active	Tape & Reel
1PS76SB40,115	Nexperia USA Inc.	40 V	120	1 V @ 40 mA	N/A	Small Signal ≤ 200mA, Any Speed	SOD-323	150°C	Active	Tape & Reel
1PS76SB40,135	Nexperia USA Inc.	40 V	120	1 V @ 40 mA	N/A	Small Signal ≤ 200mA, Any Speed	SOD-323	150°C	Active	Tape & Reel
BAT54JFILM	STMicroelectronics	40 V	300	900 mV @ 100 mA	5	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Cut Tape & Digi-Reel
NSVR0240HT1G	onsemi	40 V	250	710 mV @ 200 mA	N/A	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Tape & Reel
PMEG4005AEA,115	Nexperia USA Inc.	40 V	500	470 mV @ 500 mA	N/A	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Cut Tape & Digi-Reel
PMEG4010BEA,115	Nexperia USA Inc.	40 V	1000	640 mV @ 1 A	N/A	Fast Recovery ≤ 500ns, > 200mA	SOD-323	150°C	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

The ZLLS400QTA, ZLLS400QTC, and ZLLS400TA are direct parametric equivalents manufactured by Diodes Incorporated. All three parts maintain identical electrical specifications: 40 V reverse voltage, 520 mA current rating, 500 mV forward voltage at 400 mA, and 3 ns reverse recovery time. These parts are classified as Active products, ensuring long-term availability and supply chain continuity. Selection among these three equivalents depends on packaging requirements: ZLLS400QTA and ZLLS400QTC are supplied in Tape & Reel format, while ZLLS400TA is available in Cut Tape & Digi-Reel format. Both ZLLS400QTA and ZLLS400QTC carry AEC-Q101 automotive qualification, suitable for automotive-grade applications.

Functional Alternatives with Current Derating:

For applications where the full 520 mA current rating is not required, the PMEG4005AEA,115 (Nexperia) provides a close alternative with 500 mA rating and superior forward voltage characteristics (470 mV @ 500 mA versus 500 mV @ 400 mA). This part maintains fast recovery speed and 150°C maximum junction temperature. The NSVR0240HT1G (onsemi) offers 250 mA current rating with AEC-Q101 automotive qualification and extended temperature range (-55°C to 150°C).

Lower Current Alternatives:

The 1PS76SB21,115 (200 mA) and 1PS76SB40,115 or 1PS76SB40,135 (120 mA) from Nexperia are classified as small signal diodes and are suitable only for applications with significantly reduced current requirements. These parts exhibit higher forward voltage and lack fast recovery characteristics.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and MSL-1 moisture sensitivity rating, matching the original ZLLS400TC specifications. Parts designated with AEC-Q101 qualification (ZLLS400QTA, ZLLS400QTC, NSVR0240HT1G) are suitable for automotive applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can ZLLS400QTA, ZLLS400QTC, or ZLLS400TA be used as direct replacements for ZLLS400TC?

A: Yes. These three parts are parametric equivalents with identical electrical specifications. The differences are packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and product status (Active versus Obsolete). Selection depends on your procurement and assembly requirements. ZLLS400QTA and ZLLS400QTC include AEC-Q101 automotive qualification.

Q: What is the difference between ZLLS400QTA and ZLLS400QTC?

A: Both parts are parametric equivalents with identical electrical specifications and Tape & Reel packaging. The difference lies in the specific tape configuration or reel size, which is a procurement and assembly line consideration. Consult your supplier for specific reel specifications.

Q: Can I use PMEG4005AEA,115 as a substitute if my circuit only requires 500 mA?

A: Yes. The PMEG4005AEA,115 is rated for 500 mA and maintains the 40 V voltage rating, SOD-323 package, and fast recovery characteristics. It offers improved forward voltage performance (470 mV @ 500 mA) compared to the ZLLS400TC (500 mV @ 400 mA). This part is suitable for applications where the full 520 mA rating is not required.

Q: Why do some substitute parts have lower current ratings?

A: The ZLLS400TC is rated for 520 mA, which is a relatively high current for the SOD-323 package. Some manufacturers offer alternatives with lower current ratings (120 mA to 300 mA) in the same package. These lower-rated parts are suitable only for applications with reduced current requirements and should not be used in circuits designed for the full 520 mA specification.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (ZLLS400QTA, ZLLS400QTC, NSVR0240HT1G) have undergone rigorous testing for reliability and performance in automotive environments. Use these parts for automotive applications requiring formal qualification documentation.

Q: Is the SOD-323 package the same across all substitute parts?

A: Yes. All substitute parts listed use the SC-76, SOD-323 surface mount package, ensuring mechanical and electrical compatibility with the original ZLLS400TC. This package designation is consistent across all manufacturers.

Q: What is the significance of the 3 ns reverse recovery time in the ZLLS400TC?

A: The 3 ns reverse recovery time indicates fast switching characteristics, making the ZLLS400TC suitable for high-frequency switching applications. Substitute parts with comparable or faster recovery times (ZLLS400QTA, ZLLS400QTC, ZLLS400TA, BAT54JFILM, PMEG4005AEA,115, PMEG4010BEA,115) maintain this performance. Small signal alternatives (1PS76SB21,115, 1PS76SB40,115, 1PS76SB40,135) do not specify recovery time and are not suitable for high-speed switching.

Q: Can I use PMEG4010BEA,115 (1 A rating) in place of ZLLS400TC (520 mA)?

A: Yes. The PMEG4010BEA,115 exceeds the current requirement and maintains the 40 V voltage rating, SOD-323 package, and fast recovery characteristics. This part provides design margin for current capacity. However, the higher forward voltage (640 mV @ 1 A) may result in increased power dissipation compared to the ZLLS400TC (500 mV @ 400 mA).

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Both are surface mount packaging formats for automated assembly. Tape & Reel supplies components on continuous tape wound on a reel, suitable for high-volume production. Cut Tape & Digi-Reel supplies components on tape segments, suitable for lower-volume or mixed-component assembly. Selection depends on your manufacturing process and volume requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, matching the original ZLLS400TC specification. This ensures compatibility with environmental and regulatory requirements.

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