ZHCS500TC Equivalent & Substitute Parts

Part Overview

The ZHCS500TC is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 500 mA average rectified current in a surface mount SOT-23-3 package. This component 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 and current parameters while accommodating packaging and thermal requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA	mV
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	40 µA @ 30 V	µA
Capacitance @ Vr, F	20 pF @ 25V, 1MHz	pF
Operating Temperature - Junction (Max)	125	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Technology	Schottky	-
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-

Substitute Part Grouping Explanation

Substitute parts for the ZHCS500TC are grouped based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 500 mA minimum
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount compatibility)
Technology: Schottky diode
Mounting Type: Surface Mount

Parametric Equivalent Classification: Parts meeting all primary criteria with identical or superior electrical performance characteristics are classified as parametric equivalents. These parts maintain the same voltage and current ratings with compatible package specifications.

Manufacturer Recommended Classification: Parts with reduced current ratings (120 mA, 200 mA, 300 mA) or modified electrical characteristics are classified as manufacturer recommended alternatives. These parts are suitable for applications where the full 500 mA rating is not required, provided circuit design accommodates the reduced current capacity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [mV]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	Package
ZHCS500TC	Diodes Incorporated	40	500	550 @ 500 mA	10	40 @ 30 V	125	Obsolete	SOT-23-3
ZHCS500TA	Diodes Incorporated	40	500	550 @ 500 mA	10	40 @ 30 V	125	Active	SOT-23-3
BAS40,215	Nexperia USA Inc.	40	120	1000 @ 40 mA	-	10 @ 40 V	150	Active	TO-236AB
BAS40,235	Nexperia USA Inc.	40	120	1000 @ 40 mA	-	10 @ 40 V	150	Active	TO-236AB
BAS40-TP	Micro Commercial Co	40	200	1000 @ 40 mA	5	200 nA @ 30 V	125	Active	SOT-23
BAT54FILM	STMicroelectronics	40	300	900 @ 100 mA	5	1 @ 30 V	150	Active	SOT-23-3
BAT64E6327HTSA1	Infineon Technologies	40	120	750 @ 100 mA	5	2 @ 30 V	150	Active	SOT-23-3
BAT721,215	Nexperia USA Inc.	40	200	550 @ 200 mA	-	15 @ 30 V	125	Active	TO-236AB
PMEG4005ET,215	Nexperia USA Inc.	40	500	470 @ 500 mA	-	100 @ 40 V	150	Active	TO-236AB
PMEG4010ET,215	Nexperia USA Inc.	40	1000	640 @ 1 A	-	100 @ 40 V	150	Active	TO-236AB
BAT720,215	Nexperia USA Inc.	40	500	550 @ 500 mA	-	100 @ 35 V	125	Active	TO-236AB

Engineering Selection Recommendations

Direct Parametric Equivalent:

ZHCS500TA is the primary direct replacement for ZHCS500TC. Both parts are manufactured by Diodes Incorporated with identical electrical specifications: 40 V reverse voltage, 500 mA average rectified current, 550 mV forward voltage at 500 mA, and 10 ns reverse recovery time. ZHCS500TA maintains active product status with 17,400 units in stock, ensuring long-term availability. The part is supplied in Cut Tape and Digi-Reel packaging formats. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) are maintained.

Full Current Rating Alternatives (500 mA):

PMEG4005ET,215 (Nexperia USA Inc.) and BAT720,215 (Nexperia USA Inc.) both support 500 mA average rectified current at 40 V reverse voltage. PMEG4005ET,215 features superior forward voltage performance at 470 mV @ 500 mA compared to the original 550 mV specification, with higher maximum junction temperature of 150°C. BAT720,215 maintains identical forward voltage characteristics (550 mV @ 500 mA) and is available in higher inventory quantities (4,300 units). Both parts are supplied in TO-236AB package format with active product status.

PMEG4010ET,215 (Nexperia USA Inc.) provides 1 A current capacity at 40 V, exceeding the original 500 mA requirement. This part is suitable for applications requiring higher current headroom and features 150°C maximum junction temperature with 89,080 units in stock.

Reduced Current Rating Alternatives:

For applications where full 500 mA capacity is not required, the following parts are available:

BAT54FILM (STMicroelectronics) supports 300 mA at 40 V with fast recovery characteristics (5 ns reverse recovery time) and maintains SOT-23-3 package compatibility. Operating temperature range extends to 150°C maximum junction temperature with 47,300 units in stock.

BAT721,215 (Nexperia USA Inc.) supports 200 mA at 40 V with forward voltage of 550 mV @ 200 mA, matching the original part's forward voltage characteristic. AEC-Q100 automotive qualification is provided with 4,200 units available.

BAS40-TP (Micro Commercial Co) supports 200 mA at 40 V with forward voltage of 1000 mV @ 40 mA. This part features 27,773 units in stock and extended operating temperature range of -55°C to 125°C.

BAS40,215 and BAS40,235 (Nexperia USA Inc.) both support 120 mA at 40 V with AEC-Q100 automotive qualification. BAS40,215 provides 6,100 units in stock; BAS40,235 provides 10,552 units. Both parts feature 150°C maximum junction temperature.

BAT64E6327HTSA1 (Infineon Technologies) supports 120 mA at 40 V with AEC-Q101 automotive qualification and 35,501 units in stock. Forward voltage is 750 mV @ 100 mA with 5 ns reverse recovery time.

Compliance and Certification Status:

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level (MSL 1). Automotive-grade alternatives with AEC-Q100 or AEC-Q101 qualification are available from Nexperia USA Inc. and Infineon Technologies for applications requiring automotive-level reliability.

Frequently Asked Questions (FAQ)

Q: Can ZHCS500TA directly replace ZHCS500TC without circuit modification?

A: Yes. ZHCS500TA is a parametric equivalent with identical electrical specifications and package format. Both parts are Schottky diodes rated for 40 V reverse voltage and 500 mA average rectified current in SOT-23-3 package. The primary difference is product status: ZHCS500TC is obsolete while ZHCS500TA is active with higher inventory availability.

Q: What is the difference between TO-236AB and SOT-23-3 package designations?

A: TO-236-3, SC-59, and SOT-23-3 are equivalent package designations for the same three-terminal surface mount package. TO-236AB is an alternative designation used by some manufacturers for the same physical package. All parts listed in this reference use compatible package footprints suitable for SOT-23-3 land patterns.

Q: Can I use PMEG4005ET,215 instead of ZHCS500TC in my circuit?

A: PMEG4005ET,215 is suitable if your circuit design accommodates the TO-236AB package format and the different pin configuration. Both parts support 40 V reverse voltage and 500 mA average rectified current. PMEG4005ET,215 offers improved forward voltage performance (470 mV vs. 550 mV @ 500 mA) and higher maximum junction temperature (150°C vs. 125°C). Verify PCB footprint compatibility before implementation.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time indicates the speed at which the diode transitions from conducting to blocking state. The original ZHCS500TC specifies 10 ns reverse recovery time, classified as fast recovery. Substitute parts with 5 ns recovery time (BAT54FILM, BAS40-TP, BAT64E6327HTSA1) provide faster switching performance. Parts without specified trr values are classified as small signal diodes with inherently faster recovery characteristics.

Q: Are automotive-qualified alternatives available?

A: Yes. BAS40,215, BAS40,235, BAT721,215, and BAT64E6327HTSA1 carry automotive-grade qualification (AEC-Q100 or AEC-Q101). These parts are suitable for automotive applications requiring formal qualification documentation. Standard industrial-grade alternatives are also available from all manufacturers listed.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage affects power dissipation and circuit efficiency. The original ZHCS500TC specifies 550 mV @ 500 mA. PMEG4005ET,215 provides lower forward voltage at 470 mV @ 500 mA, reducing power loss by approximately 16%. Conversely, BAS40 series parts specify 1000 mV @ 40 mA, which is measured at lower current and not directly comparable. Verify forward voltage specifications at your circuit's operating current before selection.

Q: Can I use a 1 A rated diode (PMEG4010ET,215) in place of the 500 mA part?

A: Yes, provided your circuit design accommodates the TO-236AB package format. PMEG4010ET,215 is rated for 1 A average rectified current at 40 V, exceeding the original 500 mA requirement. This provides additional current margin and thermal headroom. Forward voltage is 640 mV @ 1 A. Verify PCB footprint compatibility and thermal management requirements before implementation.

Q: What inventory considerations should I evaluate?

A: ZHCS500TA (17,400 units), PMEG4005ET,215 (131,460 units), and PMEG4010ET,215 (89,080 units) offer the highest inventory availability. These parts ensure long-term supply continuity for production applications. Reduced current alternatives such as BAT54FILM (47,300 units) and BAT64E6327HTSA1 (35,501 units) also maintain substantial stock levels.

Q: How do I determine which substitute part is appropriate for my application?

A: Evaluate your circuit requirements against the following parameters: (1) Required reverse voltage rating (minimum 40 V), (2) Required average rectified current (minimum 500 mA for full equivalence, or lower if circuit design permits), (3) Package format compatibility (SOT-23-3 or TO-236AB), (4) Forward voltage and power dissipation constraints, (5) Operating temperature requirements, (6) Compliance and qualification requirements (automotive, industrial, or consumer grade). Select the part meeting all requirements with the highest inventory availability and lowest cost.

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