ZLLS500TC Equivalent & Substitute Parts

Part Overview

The ZLLS500TC is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 700 mA average rectified current in a surface mount SOT-23-3 package. This device is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain electrical compatibility within the specified voltage, current, and thermal parameters while accommodating packaging and qualification requirements.

Key Parameters

Parameter	Value	Condition
Voltage - DC Reverse (Vr) (Max)	40 V	—
Current - Average Rectified (Io)	700 mA	—
Voltage - Forward (Vf) (Max)	530 mV	@ 500 mA
Reverse Recovery Time (trr)	3 ns	—
Current - Reverse Leakage	10 µA	@ 30 V
Capacitance @ Vr	16 pF	@ 30 V, 1 MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150°C	—
Technology	Schottky	—
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—

Substitute Part Grouping Explanation

Substitute parts for the ZLLS500TC are categorized based on electrical parameter compatibility and product status. The primary substitution criteria are:

Parametric Equivalents (Direct Replacements): Parts that maintain identical electrical specifications across voltage rating, current rating, forward voltage, reverse recovery time, and thermal characteristics. These parts are interchangeable without circuit modification.

Current-Rated Substitutes (Functional Alternatives): Parts that maintain the 40 V voltage rating and fast recovery speed classification but operate at different current ratings. These substitutes are selected when the application current requirement is lower than the original 700 mA specification. Current derating must be verified against circuit requirements.

Voltage-Compatible Substitutes (Conditional Alternatives): Parts that maintain the 40 V voltage rating and SOT-23-3 package but differ in current capacity or speed classification. These are applicable when circuit current demands are lower than the original specification.

The following parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed application requirement
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3
Operating Temperature - Junction (Max): Must support application thermal environment
Technology: Schottky diode classification required

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (mA)	Vf (Max)	trr (ns)	Ir @ Vr	Tj (Max)	Product Status	Grade
ZLLS500TC	Diodes Incorporated	40 V	700	530 mV @ 500 mA	3	10 µA @ 30 V	150°C	Obsolete	—
ZLLS500QTA	Diodes Incorporated	40 V	700	530 mV @ 500 mA	3	10 µA @ 30 V	150°C	Active	Automotive (AEC-Q101)
ZLLS500TA	Diodes Incorporated	40 V	700	530 mV @ 500 mA	3	10 µA @ 30 V	150°C	Active	—
BAS40,215	Nexperia USA Inc.	40 V	120	1 V @ 40 mA	—	10 µA @ 40 V	150°C	Active	Automotive (AEC-Q100)
BAS40,235	Nexperia USA Inc.	40 V	120	1 V @ 40 mA	—	10 µA @ 40 V	150°C	Active	Automotive (AEC-Q100)
BAT64E6327HTSA1	Infineon Technologies	40 V	120	750 mV @ 100 mA	5	2 µA @ 30 V	150°C	Active	Automotive (AEC-Q101)
BAT720,215	Nexperia USA Inc.	40 V	500	550 mV @ 500 mA	—	100 µA @ 35 V	125°C	Active	—
BAT720,235	Nexperia USA Inc.	40 V	500	550 mV @ 500 mA	—	100 µA @ 35 V	125°C	Active	—
BAT721,215	Nexperia USA Inc.	40 V	200	550 mV @ 200 mA	—	15 µA @ 30 V	125°C	Active	Automotive (AEC-Q100)
PMEG4005ET,215	Nexperia USA Inc.	40 V	500	470 mV @ 500 mA	—	100 µA @ 40 V	150°C	Active	—
PMEG4010ET,215	Nexperia USA Inc.	40 V	1000	640 mV @ 1 A	—	100 µA @ 40 V	150°C	Active	—

Engineering Selection Recommendations

Primary Equivalent (Recommended for Direct Replacement):

ZLLS500TA and ZLLS500QTA are parametric equivalents of the ZLLS500TC, maintaining identical electrical specifications including 40 V reverse voltage, 700 mA current rating, 530 mV forward voltage at 500 mA, and 3 ns reverse recovery time. Both parts are active product status. ZLLS500QTA includes automotive qualification (AEC-Q101), suitable for applications requiring automotive-grade components. ZLLS500TA is available without automotive qualification. These parts are manufactured by Diodes Incorporated and maintain the same base product number (ZLLS500), ensuring design continuity.

Current-Derating Substitutes (Lower Current Applications):

For applications requiring current ratings below 700 mA, the following parts maintain 40 V voltage compatibility:

BAT720,215 and BAT720,235 (Nexperia) provide 500 mA current rating with 550 mV forward voltage at 500 mA. These parts are active status and maintain fast recovery speed classification. Operating temperature maximum is 125°C, which is lower than the original 150°C specification.

PMEG4005ET,215 (Nexperia) provides 500 mA current rating with improved forward voltage performance (470 mV at 500 mA) and maintains 150°C operating temperature maximum. This part is active status.

BAT721,215 (Nexperia) provides 200 mA current rating with automotive qualification (AEC-Q100). Operating temperature maximum is 125°C.

BAS40,215 and BAS40,235 (Nexperia) provide 120 mA current rating with automotive qualification (AEC-Q100). These parts are suitable only for applications with significantly reduced current requirements.

Higher Current Applications:

PMEG4010ET,215 (Nexperia) provides 1 A current rating at 40 V, suitable for applications exceeding the original 700 mA specification. This part maintains 150°C operating temperature maximum and fast recovery speed classification.

Automotive Applications:

For automotive-qualified designs, ZLLS500QTA (AEC-Q101), BAS40,215 and BAS40,235 (AEC-Q100), BAT64E6327HTSA1 (AEC-Q101), and BAT721,215 (AEC-Q100) are available. Selection depends on current requirement and thermal environment.

Frequently Asked Questions (FAQ)

Q: Can ZLLS500TA directly replace ZLLS500TC without circuit modification?

A: Yes. ZLLS500TA is a parametric equivalent with identical electrical specifications: 40 V reverse voltage, 700 mA current rating, 530 mV forward voltage at 500 mA, and 3 ns reverse recovery time. Both parts use the SOT-23-3 package. The primary difference is product status (ZLLS500TC is obsolete; ZLLS500TA is active).

Q: What is the difference between ZLLS500TA and ZLLS500QTA?

A: Both parts are parametric equivalents with identical electrical specifications. ZLLS500QTA includes automotive qualification (AEC-Q101) and is designated as automotive-grade. ZLLS500TA does not carry automotive qualification. Selection depends on application requirements for automotive compliance.

Q: Can BAT720,235 replace ZLLS500TC in all applications?

A: BAT720,235 maintains the 40 V voltage rating and SOT-23-3 package but is rated for 500 mA current versus the original 700 mA. This part is suitable only for applications where the circuit current requirement does not exceed 500 mA. Additionally, the operating temperature maximum is 125°C compared to 150°C for the original part. Circuit thermal analysis is required to confirm compatibility.

Q: What is the significance of the "Fast Recovery" speed classification?

A: Fast Recovery classification indicates reverse recovery time ≤ 500 ns for currents > 200 mA. This specification is critical for high-frequency switching applications. ZLLS500TC, ZLLS500TA, ZLLS500QTA, BAT720,215, BAT720,235, PMEG4005ET,215, and PMEG4010ET,215 all meet this classification. BAS40 and BAT721 series parts are classified as Small Signal (≤ 200 mA) and are not suitable for applications requiring fast recovery performance at higher currents.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the original ZLLS500TC.

Q: What packaging options are available for substitute parts?

A: All substitute parts use the TO-236-3, SC-59, or SOT-23-3 package designation, which are equivalent surface mount packages. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging options are available depending on the specific part number. Verify packaging format with supplier documentation for procurement requirements.

Q: Can PMEG4010ET,215 be used in place of ZLLS500TC?

A: PMEG4010ET,215 is suitable for applications where current exceeds 700 mA, as it is rated for 1 A. The part maintains 40 V voltage rating, SOT-23-3 package, and 150°C operating temperature maximum. However, forward voltage is higher (640 mV at 1 A versus 530 mV at 500 mA for the original). Circuit analysis is required to confirm thermal and electrical compatibility.

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

A: All substitute parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage and handling requirements are equivalent to the original ZLLS500TC.

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