CDBQR43 Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBQR43 is a Schottky rectifier diode manufactured by Comchip Technology, rated for 30V DC reverse voltage and 200mA average rectified current in a 0402 surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary CDBQR43 becomes unavailable due to supply constraints, end-of-life transitions, or when alternative manufacturers' components meet identical electrical and mechanical specifications. This reference provides engineering-grade alternatives based strictly on parametric compatibility.

Key Parameters

Parameter	Value	Unit	Specification Basis
Voltage - DC Reverse (Vr) Max	30	V	Blocking voltage rating
Current - Average Rectified (Io)	200	mA	Forward current capacity
Voltage - Forward (Vf) Max @ If	1 V @ 200 mA	V @ mA	Conduction loss specification
Reverse Recovery Time (trr)	5	ns	Switching speed characteristic
Current - Reverse Leakage @ Vr	500 nA @ 25 V	nA @ V	Leakage current at rated voltage
Capacitance @ Vr, F	10	pF @ 1V, 1MHz	Junction capacitance
Package / Case	0402 (1006 Metric)	—	Physical form factor
Mounting Type	Surface Mount	—	Assembly method
Operating Temperature - Junction Max	125	°C	Thermal rating
Technology	Schottky	—	Diode type
RoHS Status	ROHS3 Compliant	—	Environmental compliance

Substitute Part Grouping Explanation

Substitution eligibility for the CDBQR43 is determined by strict parametric matching across the following critical criteria:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) Max: 30V (exact match required)
Current - Average Rectified (Io): 200mA (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 0402 (1006 Metric) or equivalent DFN1006-2 form factor (mechanical compatibility required)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) Max @ If: Must not exceed 1V @ 200mA for direct drop-in replacement; values at 100mA are acceptable if 200mA specification is met
Reverse Recovery Time (trr): 5ns nominal; deviations acceptable within small signal diode classification
Current - Reverse Leakage @ Vr: Specified at 500nA @ 25V for CDBQR43; higher leakage values (2µA, 50µA, 150µA) indicate different device grades but remain functionally compatible within 30V/200mA envelope
Capacitance @ Vr, F: 10pF nominal; variations acceptable within small signal classification
Operating Temperature - Junction: 125°C minimum required; higher ratings (150°C) provide thermal margin

Compliance Requirements:

RoHS3 Compliant (mandatory for all substitutes)
MSL 1 (Unlimited) moisture sensitivity (all listed substitutes meet this requirement)
REACH Unaffected status (all listed substitutes meet this requirement)

Substitutes are grouped into three categories: Parametric Equivalents (Comchip Technology CDBQR series), Manufacturer Recommended alternatives (NXP, Diodes Incorporated, Nexperia), and cross-manufacturer options meeting identical electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io mA	Vf (Max) @ If	trr ns	Ir @ Vr	Package	Product Status	Inventory Pcs
CDBQR43	Comchip Technology	30	200	1 V @ 200 mA	5	500 nA @ 25 V	0402 (1006 Metric)	Active	875
CDBQR42-HF	Comchip Technology	30	200	1 V @ 200 mA	5	500 nA @ 25 V	0402 (1006 Metric)	Last Time Buy	723
CDBQR54	Comchip Technology	30	200	1 V @ 100 mA	5	2 µA @ 25 V	0402 (1006 Metric)	Active	2111
CDBQR54-HF	Comchip Technology	30	200	1 V @ 100 mA	5	2 µA @ 25 V	0402 (1006 Metric)	Last Time Buy	80400
BAT54L,315	NXP Semiconductors	30	200	800 mV @ 100 mA	—	2 µA @ 25 V	SOD-882	Active	3300
BAT54LP-7	Diodes Incorporated	30	200	1 V @ 100 mA	5	2 µA @ 25 V	0402 (1006 Metric)	Active	605100
PMEG3002AEL,315	Nexperia USA Inc.	30	200	480 mV @ 200 mA	—	50 µA @ 30 V	SOD-882	Active	69370
SDM20U30LP-7	Diodes Incorporated	30	200	575 mV @ 200 mA	—	150 µA @ 30 V	0402 (1006 Metric)	Active	164200

Engineering Selection Recommendations

Primary Selection (Active Status, Highest Compatibility):

CDBQR54 and CDBQR54-HF are the preferred parametric equivalents from Comchip Technology. Both maintain identical voltage and current ratings with 5ns reverse recovery time. CDBQR54 carries Active product status with 2111 units in stock. CDBQR54-HF is designated Last Time Buy but offers significantly higher inventory (80400 units) in Cut Tape packaging, suitable for high-volume production requirements.

Cross-Manufacturer Alternatives (Active Status):

BAT54LP-7 (Diodes Incorporated) provides the highest inventory availability (605100 units) with Active status. This part maintains 30V/200mA ratings, 5ns recovery time, and 0402 package compatibility. Forward voltage specification at 100mA (1V) is equivalent to CDBQR54 series.

SDM20U30LP-7 (Diodes Incorporated) offers 164200 units in Active status with 0402 package form factor. Forward voltage is specified at 200mA (575mV), providing lower conduction loss than the primary part. Operating temperature range extends to -65°C to 125°C.

Automotive-Grade Alternative:

PMEG3002AEL,315 (Nexperia USA Inc.) is qualified to AEC-Q100 automotive standard with Active status and 69370 units available. This part features superior forward voltage performance (480mV @ 200mA) and higher operating temperature rating (150°C max junction). Package form is SOD-882 (DFN1006-2), mechanically compatible with 0402 footprint. Reverse leakage is elevated (50µA @ 30V) compared to standard grades but remains within acceptable limits for non-critical applications.

Secondary Alternative (Last Time Buy Status):

CDBQR42-HF (Comchip Technology) is electrically identical to CDBQR43 with matching forward voltage (1V @ 200mA) and leakage current (500nA @ 25V). Product status is Last Time Buy with 723 units available. This part is suitable only for applications where supply continuity is not critical.

Compliance Summary:

All listed substitutes maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity, and REACH Unaffected status, matching the environmental and regulatory requirements of the primary CDBQR43 part.

Frequently Asked Questions (FAQ)

Q: Can CDBQR54 directly replace CDBQR43 in existing designs?

A: Yes. Both parts share identical 30V reverse voltage, 200mA current rating, 5ns recovery time, and 0402 package specifications. The forward voltage specification differs only in the test current point (100mA vs. 200mA), but both meet the 1V maximum specification at their respective test conditions. Electrical performance is equivalent for circuit operation.

Q: What is the difference between CDBQR54 and CDBQR54-HF?

A: Both parts are electrically identical with matching 30V/200mA ratings and 5ns recovery time. The primary difference is packaging format: CDBQR54 is supplied in Tape & Reel (TR), while CDBQR54-HF is supplied in Cut Tape (CT). CDBQR54-HF carries Last Time Buy status but offers substantially higher inventory (80400 vs. 2111 units). Selection depends on packaging requirements and supply continuity needs.

Q: Are BAT54LP-7 and PMEG3002AEL,315 suitable for direct substitution?

A: Both parts meet the 30V/200mA electrical envelope and are mechanically compatible. BAT54LP-7 maintains the 0402 package form factor with standard leakage characteristics (2µA @ 25V). PMEG3002AEL,315 uses SOD-882 package (DFN1006-2 footprint) with automotive qualification (AEC-Q100) and superior forward voltage performance (480mV @ 200mA). Package footprint differences require PCB layout verification before substitution.

Q: What is the significance of reverse leakage current variations (500nA vs. 2µA vs. 50µA)?

A: Reverse leakage current indicates the quality grade and manufacturing process of the Schottky diode. CDBQR43 and CDBQR42-HF specify 500nA @ 25V (standard grade). CDBQR54 series and BAT54LP-7 specify 2µA @ 25V (commercial grade). PMEG3002AEL,315 specifies 50µA @ 30V (automotive grade). Higher leakage values are acceptable in most applications but may impact performance in high-impedance circuits or precision analog applications. Selection should be based on circuit requirements, not leakage alone.

Q: Can parts with different package designations (0402 vs. SOD-882) be used interchangeably?

A: 0402 (1006 Metric) and SOD-882 (DFN1006-2) are mechanically equivalent form factors with identical footprint dimensions. PCB layout compatibility is confirmed. However, physical component dimensions and lead configurations may differ slightly. Verify footprint compatibility in design software before substitution. Both packages are surface mount with identical soldering requirements.

Q: What is the advantage of PMEG3002AEL,315 over standard Schottky diodes?

A: PMEG3002AEL,315 offers three distinct advantages: (1) AEC-Q100 automotive qualification for reliability-critical applications, (2) superior forward voltage performance (480mV @ 200mA) reducing power dissipation, and (3) higher operating temperature rating (150°C junction max vs. 125°C). These characteristics make it suitable for automotive, industrial, and high-temperature applications. Reverse leakage is higher (50µA @ 30V), which is acceptable in most applications but should be verified for low-power or high-impedance circuits.

Q: Which substitute offers the best inventory availability?

A: BAT54LP-7 (Diodes Incorporated) provides the highest inventory with 605100 units in stock and Active product status. This part is recommended for applications requiring immediate availability and long-term supply continuity. CDBQR54-HF offers the second-highest inventory (80400 units) with identical electrical specifications but Last Time Buy status.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity, and REACH Unaffected status, matching the environmental and regulatory requirements of the primary CDBQR43 part. No additional compliance verification is required for substitution.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage variations (480mV to 1V @ specified current) affect power dissipation and voltage drop across the diode. Lower forward voltage (PMEG3002AEL,315 at 480mV) reduces heat generation and improves efficiency. Higher forward voltage (CDBQR43/CDBQR42-HF at 1V) increases power loss. Selection should be based on circuit thermal budget and efficiency requirements. For most rectification applications, variations within this range are acceptable.

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