CDBQR42 Schottky Diode 30V 200mA 0402 Equivalent & Substitute Parts

Part Overview

The CDBQR42 is a Schottky rectifier diode manufactured by Comchip Technology, rated for 30V DC reverse voltage and 200mA average rectified current in a surface mount 0402 (1006 Metric) package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple suppliers is required for supply chain continuity. The substitute parts listed maintain electrical compatibility within the specified parameter ranges while potentially offering different packaging options, inventory availability, or manufacturer alternatives.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1	V @ 200 mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	500	nA @ 25 V
Capacitance @ Vr, F	10	pF @ 1V, 1MHz
Package / Case	0402 (1006 Metric)	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the CDBQR42 is determined by the following critical electrical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 30V
Current - Average Rectified (Io): Must equal or exceed 200mA
Technology: Schottky diode type
Mounting Type: Surface Mount
Package compatibility: 0402 (1006 Metric) or equivalent DFN1006-2 footprint

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max): Acceptable range up to 1V @ rated current
Reverse Recovery Time (trr): 5ns or faster
Current - Reverse Leakage @ Vr: Acceptable up to 2µA @ 25V for general applications
Capacitance @ Vr, F: 10pF to 25pF @ 1V, 1MHz
Operating Temperature - Junction: 125°C minimum
RoHS3 Compliance: Required for regulatory alignment

The substitute parts are grouped into three categories: Parametric Equivalents (identical electrical specifications from the same manufacturer), Manufacturer Recommended Alternatives (cross-manufacturer equivalents with verified compatibility), and Extended Compatibility Options (parts meeting all critical parameters with minor variations in secondary characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io mA	Vf (Max) V	trr ns	Ir @ Vr µA	Package	Status	Inventory Pcs
CDBQR42	Comchip Technology	30	200	1 @ 200mA	5	0.5 @ 25V	0402 (1006 Metric)	Active	1111
CDBQR42-HF	Comchip Technology	30	200	1 @ 200mA	5	0.5 @ 25V	0402 (1006 Metric)	Last Time Buy	723
CDBQR54	Comchip Technology	30	200	1 @ 100mA	5	2 @ 25V	0402 (1006 Metric)	Active	2111
CDBQR54-HF	Comchip Technology	30	200	1 @ 100mA	5	2 @ 25V	0402 (1006 Metric)	Last Time Buy	80400
BAT54L,315	NXP Semiconductors	30	200	0.8 @ 100mA	-	2 @ 25V	SOD-882	Active	3300
BAT54LP-7	Diodes Incorporated	30	200	1 @ 100mA	5	2 @ 25V	0402 (1006 Metric)	Active	605100
PMEG3002AEL,315	Nexperia USA Inc.	30	200	0.48 @ 200mA	-	50 @ 30V	SOD-882	Active	69370
SDM20U30LP-7	Diodes Incorporated	30	200	0.575 @ 200mA	-	150 @ 30V	0402 (1006 Metric)	Active	164200

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CDBQR42-HF is the direct parametric equivalent with identical electrical characteristics. However, this part carries Last Time Buy status, indicating discontinued production. Selection should prioritize CDBQR54 or CDBQR54-HF for long-term availability, as both maintain the same voltage and current ratings with Active or Last Time Buy status from the same manufacturer.

For Cross-Manufacturer Substitution:

BAT54LP-7 (Diodes Incorporated) and BAT54L,315 (NXP Semiconductors) are manufacturer-recommended alternatives meeting all critical electrical parameters. Both maintain 30V reverse voltage and 200mA current ratings with RoHS3 compliance. BAT54LP-7 offers superior inventory availability (605,100 pcs) and maintains the 0402 package format. BAT54L,315 uses SOD-882 package, requiring PCB layout verification for footprint compatibility.

For Automotive and High-Reliability Applications:

PMEG3002AEL,315 (Nexperia USA Inc.) is qualified to AEC-Q100 automotive standards with Active product status and 69,370 pcs inventory. This part features lower forward voltage (0.48V @ 200mA) and operates to 150°C junction temperature, exceeding the base specification. Package format is SOD-882, requiring footprint verification.

For Maximum Inventory Availability:

SDM20U30LP-7 (Diodes Incorporated) provides the highest inventory level (164,200 pcs) with Active status. This part maintains 0402 package compatibility and meets all critical electrical parameters. Forward voltage is 0.575V @ 200mA with reverse leakage of 150µA @ 30V, acceptable for general-purpose rectification applications.

Compliance and Regulatory Alignment:

All listed substitute parts maintain RoHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity level, ensuring regulatory alignment with the original CDBQR42 specification.

Frequently Asked Questions (FAQ)

Q: Can CDBQR54 directly replace CDBQR42 in my circuit?

A: Yes. CDBQR54 maintains identical voltage (30V) and current (200mA) ratings with the same 0402 package. The primary difference is forward voltage specification at 100mA (1V) versus 200mA (1V) for CDBQR42, and reverse leakage increases from 500nA to 2µA @ 25V. These variations are within acceptable tolerance for most rectification applications. Verify your circuit's forward voltage drop requirements before substitution.

Q: What is the difference between CDBQR42-HF and CDBQR42?

A: Both parts are electrically identical with 30V reverse voltage, 200mA current, and 1V forward voltage @ 200mA. The "-HF" designation indicates a different manufacturing process or tape format. CDBQR42-HF carries Last Time Buy status, meaning production is discontinued. For new designs, use CDBQR54 or CDBQR54-HF for continued availability.

Q: Can I use BAT54LP-7 instead of CDBQR42?

A: Yes. BAT54LP-7 (Diodes Incorporated) meets all critical electrical parameters: 30V reverse voltage, 200mA current, and maintains the 0402 package footprint. Forward voltage is 1V @ 100mA, and reverse leakage is 2µA @ 25V. This part is Active status with 605,100 pcs inventory, making it a reliable long-term alternative.

Q: What is the package difference between 0402 and SOD-882?

A: Both are surface mount packages for small signal diodes. 0402 (1006 Metric) is a rectangular chip package measuring 1.0mm × 0.6mm. SOD-882 is a smaller DFN (Dual Flat No-lead) package. PCB footprints are not interchangeable; verify your circuit board design supports the selected package before substitution.

Q: Why does PMEG3002AEL,315 have lower forward voltage than CDBQR42?

A: PMEG3002AEL,315 features optimized Schottky junction design for reduced forward voltage (0.48V @ 200mA) compared to CDBQR42 (1V @ 200mA). This results in lower power dissipation and heat generation. The part is AEC-Q100 qualified for automotive applications and operates to 150°C junction temperature. Lower forward voltage may require circuit verification if voltage drop is a critical design parameter.

Q: Is SDM20U30LP-7 suitable for high-frequency switching applications?

A: SDM20U30LP-7 is specified as a Schottky rectifier diode without published reverse recovery time (trr). CDBQR42 specifies 5ns trr, suitable for small signal switching. SDM20U30LP-7 is recommended for general rectification and power supply applications. For high-frequency switching circuits requiring fast recovery, verify trr specifications with the manufacturer before substitution.

Q: Can I mix different substitute parts in the same circuit board?

A: Mixing substitute parts is not recommended for production designs. Select a single part number for all instances of this diode function to ensure consistent electrical behavior, thermal characteristics, and manufacturing traceability. If multiple suppliers are required, qualify each part number separately and document the substitution in design records.

Q: What inventory considerations should I evaluate?

A: CDBQR42 has 1,111 pcs available. For long-term production, consider BAT54LP-7 (605,100 pcs), SDM20U30LP-7 (164,200 pcs), or PMEG3002AEL,315 (69,370 pcs). Parts with Last Time Buy status (CDBQR42-HF, CDBQR54-HF) have limited availability and should not be selected for new designs requiring sustained production volumes.

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