RB751SL Equivalent & Substitute Parts

Part Overview

The RB751SL is a Schottky rectifier diode manufactured by onsemi, rated for 30V DC reverse voltage and 30mA average rectified current in a surface mount SOD-923F package. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	30 mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 1 mA
Technology	Schottky
Reverse Recovery Time (trr)	8 ns
Current - Reverse Leakage @ Vr	500 nA @ 30 V
Operating Temperature - Junction	-55°C ~ 150°C
Package / Case	SOD-923
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RB751SL are grouped based on electrical parameter compatibility within the Schottky diode rectifier category. The primary substitution criteria are:

Electrical Parameters (Must Match or Exceed):

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 30 mA minimum
Technology: Schottky
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Mechanical Parameters (Package Compatibility):

Mounting Type: Surface Mount
Package options: SOD-923, SOD-523 (both surface mount variants)

Compliance Parameters:

RoHS3 Compliant
REACH Unaffected status

Parts are classified into two categories: Parametric Equivalents (identical electrical ratings with same base product number) and Similar Alternatives (higher current ratings or different package formats that maintain voltage and temperature specifications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Package	Product Status	Temperature Range
RB751SL	onsemi	30 V	30 mA	370 mV @ 1 mA	8 ns	SOD-923	Obsolete	-55°C ~ 150°C
RB751S40T1G	onsemi	30 V	30 mA	370 mV @ 1 mA	—	SOD-523	Active	-55°C ~ 150°C
RB751S40P2T5G	onsemi	30 V	30 mA	370 mV @ 1 mA	8 ns	SOD-923	Active	-55°C ~ 150°C
PMEG3002AEB,115	Nexperia USA Inc.	30 V	200 mA	480 mV @ 200 mA	—	SOD-523	Active	-65°C ~ 125°C
PMEG3005EB,115	Nexperia USA Inc.	30 V	500 mA	500 mV @ 500 mA	—	SOD-523	Active	-55°C ~ 150°C
PMEG3010EB,115	Nexperia USA Inc.	30 V	1 A	680 mV @ 1 A	—	SOD-523	Active	-55°C ~ 150°C
RB520S30,115	Nexperia USA Inc.	30 V	200 mA	600 mV @ 200 mA	—	SOD-523	Active	-55°C ~ 150°C

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended Primary Substitute):

RB751S40P2T5G is the optimal substitute for RB751SL. Both parts share identical electrical specifications (30V, 30mA, 370mV forward voltage, 8ns recovery time) and the same SOD-923 package. RB751S40P2T5G maintains active product status with ROHS3 compliance and identical operating temperature range (-55°C to 150°C). This part provides direct form-fit-function replacement with no circuit redesign required.

Alternative Equivalent (Package Variant):

RB751S40T1G offers identical electrical performance (30V, 30mA, 370mV forward voltage) with active product status and ROHS3 compliance. The primary difference is the SOD-523 package format. This substitution is valid when PCB layout accommodates the alternate package geometry.

Higher Current Alternatives (Design Margin Applications):

PMEG3005EB,115 and PMEG3010EB,115 provide higher current ratings (500mA and 1A respectively) while maintaining 30V voltage specification. These parts are suitable for applications requiring design margin above the 30mA baseline. Both maintain ROHS3 compliance and -55°C to 150°C operating range. RB520S30,115 offers 200mA rating as an intermediate option.

Compliance Verification:

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original RB751SL specifications.

Frequently Asked Questions (FAQ)

Q: Can RB751S40P2T5G directly replace RB751SL without circuit modification?

A: Yes. RB751S40P2T5G is a parametric equivalent with identical voltage (30V), current (30mA), forward voltage (370mV @ 1mA), and recovery time (8ns) specifications. Both use SOD-923 packaging. The only difference is product status change from obsolete to active. No circuit redesign is required.

Q: What is the difference between RB751S40T1G and RB751S40P2T5G?

A: Both parts share identical electrical specifications (30V, 30mA, 370mV forward voltage). The primary difference is package format: RB751S40T1G uses SOD-523 while RB751S40P2T5G uses SOD-923. Selection depends on PCB layout requirements and available footprint space.

Q: Can I use PMEG3010EB,115 (1A rating) in place of RB751SL (30mA rating)?

A: PMEG3010EB,115 is electrically compatible with 30V voltage specification and maintains the same operating temperature range. The higher current rating (1A vs 30mA) provides design margin and does not create incompatibility. However, the SOD-523 package differs from the original SOD-923, requiring PCB layout verification. Forward voltage characteristics differ at rated current (680mV @ 1A vs 370mV @ 1mA), which may affect circuit performance in precision applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original RB751SL.

Q: What is the temperature operating range difference between RB751SL and PMEG3002AEB,115?

A: RB751SL operates from -55°C to 150°C. PMEG3002AEB,115 operates from -65°C to 125°C. The PMEG part provides lower temperature capability but reduced maximum junction temperature. Application requirements determine suitability.

Q: Why do higher current alternatives (PMEG3005EB,115, PMEG3010EB,115) have different forward voltage specifications?

A: Forward voltage is measured at the part's rated current. RB751SL forward voltage (370mV) is specified at 1mA. PMEG3005EB,115 forward voltage (500mV) is specified at 500mA, and PMEG3010EB,115 (680mV) at 1A. These differences reflect the electrical characteristics at different operating points and do not indicate incompatibility for 30mA applications.

Q: Can I mix RB751SL and RB751S40P2T5G in the same production run?

A: Both parts are electrically and mechanically equivalent with identical SOD-923 packaging. Substitution is valid. However, RB751SL is obsolete status while RB751S40P2T5G is active. For new production, RB751S40P2T5G is the recommended standard to ensure long-term supply continuity.

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