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Nexperia USA Inc. RB751S40-QX
- Part No.:
- RB751S40-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
RB751S40-QX.pdf
- Description:
- RB751S40-Q/SOD523/SC-79
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
RB751S40-QX from Nexperia is a planar Schottky barrier diode with integrated guard ring for stress protection, housed in an ultra-small SOD523 (SC-79) surface-mount package. It delivers 40 V repetitive peak reverse voltage, 370 mV forward voltage at 1 mA, and 2 pF capacitance at 1 V/1 MHz - enabling high-speed clamping and polarity protection in space-constrained automotive signal paths.
For engineers reviewing the RB751S40-QX datasheet, RB751S40-QX pinout, RB751S40-QX application, or RB751S40-QX equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, thermal resistance (450 K/W), junction temperature limit (150 °C), and real-world use cases in line termination and reverse polarity circuits.
Technical Context
This Schottky diode employs a planar die structure with an integrated guard ring to enhance ESD and transient stress resilience without compromising low-voltage switching performance. Its low 370 mV VF at 1 mA and sub-2 pF Cd support nanosecond-scale switching in high-frequency interfaces.
The device operates across −65 °C to +150 °C ambient and junction temperatures, qualified per AEC-Q101 for automotive underhood and infotainment applications. Thermal resistance of 450 K/W (junction-to-ambient, FR4 PCB) defines its power handling under reflow-soldered conditions only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - maximum repetitive reverse blocking voltage before breakdown; sets safe operating margin for 24 V automotive bus clamping |
| VF | 370 mV @ 1 mA - enables minimal conduction loss in low-current bias and sensing paths |
| Cd | 2 pF @ 1 V, 1 MHz - ensures minimal signal distortion in >100 MHz data lines and RF front-end protection |
| IF | 120 mA continuous - supports moderate current routing in sensor interface and logic-level translation |
| Rth(j-a) | 450 K/W - defines thermal derating on standard FR4 PCB; limits usable DC power to ~280 mW at Tamb = 25 °C |
| Tj max | 150 °C - junction temperature ceiling compatible with underhood automotive environments |
Pinout & Package
Package: SOD523 (SC-79), plastic surface-mount, 1.2 mm × 0.8 mm × 0.6 mm body, single-sided copper FR4 mounting, reflow soldering only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Marked side (bar) - connects to higher-potential node during reverse bias; carries return current in forward conduction |
| 2 | Anode (A) | Unmarked side - connects to lower-potential node; source of forward current flow into cathode |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring integration | Enhances ESD robustness and transient voltage immunity without increasing VF or Cd |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Ultra-low capacitance | 2 pF enables use in USB 2.0, CAN FD, and LVDS signal line protection without bandwidth degradation |
| Low forward voltage | 370 mV at 1 mA reduces power loss in always-on bias networks and precision reference clamps |
Applications
| Ultra-High-Speed Switching | Voltage Clamping |
|---|---|
Use Scenario: Signal path isolation in 100+ MHz digital interfaces where propagation delay and charge injection must be minimized. IC Role / Device Role / Timing Role: Fast-switching unidirectional current valve used as a level-shifting clamp or logic gate input protector. Use Value: 2 pF capacitance and 370 mV VF ensure <1 ns turn-on delay and negligible loading on high-speed traces. | Use Scenario: Protecting MCU I/O pins from inductive kickback in automotive solenoid drivers. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp that conducts only during overvoltage transients. Use Value: 40 V VRRM and 0.5 µA IR at 30 V provide tight clamping window with minimal leakage in standby. |
| Line Termination | Reverse Polarity Protection |
Use Scenario: Impedance-matched termination on differential serial buses (e.g., RS-485, CAN) to suppress reflections. IC Role / Device Role / Timing Role: Low-capacitance passive termination element placed at bus endpoints. Use Value: Sub-2 pF Cd avoids resonance shift while 40 V rating covers common-mode surge margins. | Use Scenario: Input protection for 12 V/24 V automotive modules powered from external connectors. IC Role / Device Role / Timing Role: Series-connected anode-to-load diode preventing damage during battery reversal. Use Value: 120 mA IF rating supports typical module sleep currents; 370 mV VF adds <4.5 mW loss at 12 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR0230HT1G | 30 V VRRM, 420 mV VF, 3.5 pF Cd, same SOD-523 package | Limited to ≤24 V systems; higher capacitance restricts use above ~50 MHz | Select when cost sensitivity outweighs 40 V margin and 2 pF requirement |
| Vishay VS-2EDH01HM3/H | 45 V VRRM, 450 mV VF, 4.5 pF Cd, SOD-323 package (larger footprint) | Higher VF increases power loss; larger package incompatible with ultra-dense layouts | Choose only if 45 V rating is mandatory and board area allows SOD-323 |
Compared with NSR0230HT1G and VS-2EDH01HM3/H, the RB751S40-QX uniquely balances 40 V rating, 2 pF capacitance, and 370 mV VF in the smallest SOD523 footprint - making it optimal for automotive signal integrity-critical designs where size and speed are jointly constrained.
Availability
RB751S40-QX is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS sensor interfaces, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for RB751S40-QX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The RB751S40-QX belongs to Nexperia's AEC-Q101-qualified Schottky diode product line, engineered specifically for signal integrity preservation and transient protection in automotive electronic control units.
FAQ
Is RB751S40-QX suitable for reflow soldering only?
Yes. The datasheet explicitly states reflow soldering is the only recommended method. Wave or hand soldering risks thermal damage due to the SOD523 package's low thermal mass and specified 450 K/W junction-to-ambient resistance on FR4. Peak reflow temperature must not exceed 260 °C per JEDEC J-STD-020.
What does the 'Q' suffix indicate in RB751S40-QX?
The 'Q' denotes AEC-Q101 qualification - confirmed by Nexperia's test documentation covering HTGB, HTRB, temperature cycling, and ESD (HBM ≥2 kV). This suffix is part of the official orderable number and reflects full automotive stress qualification, not just compliance screening.
How is the cathode identified on the RB751S40-QX package?
The cathode is marked by a visible bar on the top surface of the SOD523 package, aligned with Pin 1 per Table 2. This marking corresponds directly to the cathode terminal in the internal die layout and must connect to the higher-potential node in forward-bias operation.
Does RB751S40-QX support bidirectional ESD protection?
No. As a unidirectional Schottky diode, it provides effective clamping only in reverse bias (anode-to-ground configuration). For bidirectional protection, a paired diode array or dedicated TVS device is required - the RB751S40-QX's 40 V VRRM and 0.5 µA IR at 30 V confirm its design intent for single-polarity transient suppression.
RB751S40-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 120mA
- Voltage - Forward (Vf) (Max) @ If:
- 370 mV @ 1 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 nA @ 30 V
- Capacitance @ Vr, F:
- 2pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C
RB751S40-QX FAQ
1.How can I place an order for RB751S40-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for RB751S40-QX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RB751S40-QX reliable?
The price and inventory of RB751S40-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RB751S40-QX is usually 5 days.
3.What payment methods are accepted for RB751S40-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RB751S40-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RB751S40-QX?
RB751S40-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RB751S40-QX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RB751S40-QX?
For technical support, including RB751S40-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RB751S40-QX requirements.
6.How does Aetrix verify that RB751S40-QX is sourced from the original manufacturer or authorized distributors?
All RB751S40-QX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RB751S40-QX meets industry standards.
7.What is the process for return or replacement of RB751S40-QX?
All RB751S40-QX units undergo pre-shipment inspection (PSI). If there is an issue with RB751S40-QX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RB751S40-QX part is unused and in its original packaging.
Return procedure for RB751S40-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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