CDST-19-G Equivalent & Substitute Parts Reference

Part Overview

The CDST-19-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 100V DC reverse voltage and 200mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating modern manufacturing and supply chain requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 150 V	nA
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Mandatory Electrical Equivalence:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 200 mA minimum
Voltage - Forward (Vf) (Max) @ If: 1.25 V or lower at rated current
Operating Temperature - Junction: 150°C or higher

Package Compatibility:

Surface mount package: TO-236-3, SC-59, or SOT-23-3 equivalent

Compliance Requirements:

RoHS3 Compliant
MSL 1 (Unlimited)

Substitute parts are classified into two categories:

MFR Recommended: SBAS16LT1G (onsemi) — Active product with automotive qualification and superior reverse recovery time performance.

Parametric Equivalents: BAS19,215 and BAS19,235 (Nexperia USA Inc.) — Active products with automotive qualification and identical electrical specifications to the original CDST-19-G.

Parameter Comparison

Parameter	CDST-19-G (Comchip)	SBAS16LT1G (onsemi)	BAS19,215 (Nexperia)	BAS19,235 (Nexperia)
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 150 mA	1.25 V @ 200 mA	1.25 V @ 200 mA
Reverse Recovery Time (trr)	50 ns	6 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 150 V	1 µA @ 100 V	100 nA @ 100 V	100 nA @ 100 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Operating Temperature - Junction	150°C (Max)	-55°C ~ 150°C	150°C (Max)	150°C (Max)
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	Yes (AEC-Q101)	Yes (AEC-Q100)	Yes (AEC-Q100)
Inventory Status	905 Pcs	71200 Pcs	4300 Pcs	10375 Pcs

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalence):

BAS19,215 and BAS19,235 from Nexperia USA Inc. provide identical electrical specifications to the CDST-19-G across all critical parameters: 100V reverse voltage, 200mA average rectified current, 1.25V forward voltage at 200mA, and 50ns reverse recovery time. Both parts are active products with AEC-Q100 automotive qualification and ROHS3 compliance. These parts are suitable for applications requiring exact electrical performance matching.

For Enhanced Performance (MFR Recommended):

SBAS16LT1G from onsemi meets all mandatory electrical requirements with superior reverse recovery time (6ns versus 50ns), lower junction capacitance (2pF versus 5pF), and extended operating temperature range (-55°C to 150°C). This part carries AEC-Q101 automotive qualification and is available in significantly higher inventory (71200 pcs). Selection of SBAS16LT1G is appropriate for applications where improved switching performance and temperature margin provide system-level benefits.

All three substitute parts are surface mount components in TO-236-3/SOT-23-3 packages, compatible with existing PCB layouts. All are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can SBAS16LT1G replace CDST-19-G in all applications?

A: SBAS16LT1G meets all mandatory electrical specifications for the CDST-19-G. The faster reverse recovery time (6ns versus 50ns) and lower capacitance (2pF versus 5pF) represent performance improvements suitable for most general-purpose rectification applications. Extended operating temperature range (-55°C to 150°C) provides additional thermal margin.

Q: What is the difference between BAS19,215 and BAS19,235?

A: Both parts are manufactured by Nexperia USA Inc. and provide identical electrical specifications. The difference is in the supplier device package designation (both are TO-236AB) and inventory availability. BAS19,235 has higher inventory (10375 pcs versus 4300 pcs). Both are functionally equivalent for substitution purposes.

Q: Are the substitute parts pin-compatible with CDST-19-G?

A: All substitute parts use the same TO-236-3/SOT-23-3 surface mount package with identical pinout. Direct PCB replacement is supported without layout modification.

Q: Do the substitute parts require different soldering or assembly processes?

A: All substitute parts are surface mount components with MSL 1 (Unlimited) moisture sensitivity rating, identical to the original CDST-19-G. Standard SMT assembly processes apply without modification.

Q: Which substitute part should be selected for automotive applications?

A: All three substitute parts carry automotive qualification: SBAS16LT1G (AEC-Q101) and both BAS19 variants (AEC-Q100). Selection between them depends on performance requirements and supply availability rather than automotive compatibility.

Q: Is there a performance difference between the 50ns and 6ns reverse recovery times?

A: Reverse recovery time affects switching speed and switching losses. The 6ns recovery time of SBAS16LT1G provides faster switching compared to the 50ns specification of the original CDST-19-G and BAS19 variants. This difference is relevant in high-frequency switching applications but not critical for standard rectification circuits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. CDST-19-G, SBAS16LT1G, BAS19,215, and BAS19,235 are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

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