BAT54CTC Equivalent & Substitute Parts

Part Overview

The BAT54CTC is a Schottky diode array manufactured by Diodes Incorporated, configured as 1 pair common cathode with 30 V reverse voltage rating and 200 mA average rectified current per diode. The device is housed in a surface mount SOT-23-3 package (TO-236-3, SC-59).

The BAT54CTC is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production builds and field replacements. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io) (per Diode)	200	mA (DC)
Voltage - Forward (Vf) (Max) @ If	1	V @ 100 mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	4	µA @ 25 V
Operating Temperature - Junction (Max)	125	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAT54CTC is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io) (per Diode): 200 mA minimum
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 800 mV to 1 V @ 100 mA
Reverse Recovery Time (trr): 5 ns
Current - Reverse Leakage @ Vr: 2 µA to 4 µA @ 25 V
Operating Temperature - Junction (Max): 125°C to 150°C

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents (Identical Specifications) Parts with matching electrical characteristics and identical package designation. These parts are pin-for-pin compatible and require no circuit modifications.

Category 2: Enhanced Performance Substitutes (Superior Ratings) Parts with equal or superior voltage and current ratings, lower forward voltage drop, or extended temperature range. These parts are functionally compatible and provide improved performance margins.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ 100mA [V]	Trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	Package
BAT54CTC	Diodes Incorporated	30	200	1.0	5	4 @ 25V	125	Obsolete	SOT-23-3
BAT54CTA	Diodes Incorporated	30	200	1.0	5	4 @ 25V	125	Active	SOT-23-3
BAR43C-TP	Micro Commercial Co	30	200	0.8	5	0.5 @ 25V	150	Active	SOT-23
BAT54-E3-18	Vishay General Semiconductor - Diodes Division	30	200	0.8	5	2 @ 25V	125	Active	SOT-23-3
BAT54-G3-08	Vishay General Semiconductor - Diodes Division	30	200	0.8	5	2 @ 25V	125	Active	SOT-23-3
BAT54-HE3-18	Vishay General Semiconductor - Diodes Division	30	200	0.8	5	2 @ 25V	125	Last Time Buy	SOT-23-3
BAT5405E6327HTSA1	Infineon Technologies	30	200	0.8	5	2 @ 25V	150	Active	SOT-23-3
BAT54C,215	Nexperia USA Inc.	30	200	0.8	5	2 @ 25V	150	Active	SOT-23-3
BAT54CFILM	STMicroelectronics	40	300	0.9	5	1 @ 30V	150	Active	SOT-23-3
BAT54CLT1G	onsemi	30	200	0.8	5	2 @ 25V	125	Active	SOT-23-3
BAT54CLT3G	onsemi	30	200	0.8	5	2 @ 25V	125	Active	Active

Engineering Selection Recommendations

Primary Recommendation: BAT54CTA (Diodes Incorporated)

BAT54CTA is the direct parametric equivalent to BAT54CTC from the same manufacturer. All electrical specifications are identical, including forward voltage, reverse leakage current, and junction temperature rating. The part is in active production status with 5101 units in stock. This part provides the most direct replacement path with zero design risk.

Secondary Recommendations: BAT54CLT1G and BAT54CLT3G (onsemi)

Both onsemi variants (BAT54CLT1G and BAT54CLT3G) match all critical electrical parameters of the BAT54CTC. These parts are in active production with high inventory availability (206,082 and 43,466 units respectively). Both are RoHS3 compliant with MSL 1 rating. These parts are suitable for direct substitution.

Enhanced Performance Alternatives: BAT54-E3-18, BAT54-G3-08, BAT5405E6327HTSA1, BAT54C,215

These parts provide improved electrical characteristics compared to BAT54CTC:

Lower forward voltage drop (0.8 V vs. 1.0 V @ 100 mA)
Reduced reverse leakage current (2 µA vs. 4 µA @ 25 V)
Extended operating temperature range (150°C vs. 125°C for most variants)

All maintain identical voltage and current ratings with SOT-23-3 package compatibility. These parts are in active production status with substantial inventory availability.

Enhanced Performance with Upgraded Ratings: BAT54CFILM (STMicroelectronics)

BAT54CFILM provides superior electrical ratings:

Voltage - DC Reverse: 40 V (vs. 30 V)
Current - Average Rectified: 300 mA per diode (vs. 200 mA)
Forward voltage: 0.9 V @ 100 mA
Reverse leakage: 1 µA @ 30 V

This part is suitable for applications requiring higher voltage or current margins. It is in active production with 29,200 units in stock.

Last Time Buy Status: BAT54-HE3-18 (Vishay)

BAT54-HE3-18 is designated as Last Time Buy. While electrically equivalent to active alternatives, this part should not be selected for new designs due to its end-of-life status. Existing inventory (28,402 units) may be used for legacy product support only.

Compliance and Certifications:

All recommended substitute parts are RoHS3 compliant and REACH unaffected. BAT54-HE3-18 and BAT54C,215 carry AEC-Q101 automotive qualification. BAT54-HE3-18 is specifically qualified for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can BAT54CTA be used as a direct replacement for BAT54CTC?

A: Yes. BAT54CTA is a direct parametric equivalent manufactured by the same company (Diodes Incorporated). All electrical specifications, package designation, and pin configuration are identical. No circuit modifications are required.

Q: What is the difference between BAT54CLT1G and BAT54CLT3G?

A: Both parts are manufactured by onsemi and have identical electrical specifications. The difference is in the tape reel configuration and manufacturing date code. Both are suitable for direct substitution of BAT54CTC.

Q: Why do some substitute parts have lower forward voltage (0.8 V vs. 1.0 V)?

A: Lower forward voltage is a result of improved semiconductor processing and design optimization by different manufacturers. This represents enhanced performance and is not a compatibility issue. Lower forward voltage reduces power dissipation in the application circuit.

Q: Is BAT54CFILM compatible with BAT54CTC?

A: BAT54CFILM is functionally compatible but provides enhanced electrical ratings (40 V reverse voltage, 300 mA current). It is suitable for applications requiring higher performance margins. The SOT-23-3 package is identical, ensuring mechanical compatibility.

Q: Can I use BAT54-HE3-18 for new product designs?

A: BAT54-HE3-18 is designated Last Time Buy and should not be selected for new designs. Use active alternatives such as BAT54CLT1G, BAT54CLT3G, or BAT54-E3-18 instead.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration contains two independent Schottky diodes with a shared cathode connection. The common cathode pin is internally connected to both diode cathodes. This configuration is essential for certain circuit topologies and must be maintained when selecting substitutes.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All recommended substitute parts use the TO-236-3, SC-59, SOT-23-3 package designation. This ensures identical PCB footprint and mechanical compatibility. BAR43C-TP uses a variant SOT-23 package designation but maintains the same physical dimensions.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. This simplifies inventory management and reduces component preparation requirements compared to higher MSL ratings.

Q: Which substitute part has the lowest reverse leakage current?

A: BAT54CFILM has the lowest reverse leakage current at 1 µA @ 30 V. Most other active alternatives have 2 µA @ 25 V. Lower reverse leakage reduces standby current consumption in the application circuit.

Q: Are automotive-qualified alternatives available?

A: Yes. BAT54-HE3-18 and BAT54C,215 both carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

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