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Nexperia USA Inc. 1PS79SB40,115
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- Part No.:
- 1PS79SB40,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
1PS79SB40,115.pdf
- Description:
- DIODE SCHOTTKY 40V 120MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:815
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Product details
Overview
1PS79SB40 from Nexperia is a general-purpose Schottky diode in SOD523 (SC-79) package, rated for 40 V reverse voltage, 120 mA forward current, and 380 mV forward voltage at 1 mA. It delivers ultra-high-speed switching with low leakage (≤10 µA at 40 V), low capacitance (5 pF), and AEC-Q101 qualification for automotive-grade reliability. It serves as a clamping or freewheeling diode in compact DC-DC converters and power rail protection circuits.
For engineers reviewing the 1PS79SB40 datasheet, 1PS79SB40 pinout, 1PS79SB40 application, or 1PS79SB40 equivalent, this page provides verified electrical parameters, thermal resistance (450 K/W), cathode/anode terminal mapping, automotive qualification status, and real-world use cases in space-constrained power management designs.
Technical Context
This Schottky diode uses a planar silicon structure optimized for low forward voltage and fast recovery-no minority carrier storage delay. Its 5 pF junction capacitance and sub-10 µA reverse leakage at 40 V enable clean signal integrity in high-frequency clamp and snubber roles.
The device operates across –65 °C to +150 °C ambient and junction temperatures, with thermal resistance of 450 K/W (junction-to-ambient, FR4 PCB, single-sided copper). Its SOD523 footprint (1.2 mm × 0.8 mm × 0.6 mm) supports automated placement in ultra-dense layouts without compromising thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - Maximum blocking capability before breakdown; suitable for 3.3 V–24 V rail clamping. |
| Forward Current (IF) | 120 mA continuous - Supports moderate-power switching paths without external heatsinking. |
| Forward Voltage (VF) | 380 mV @ 1 mA - Enables low-loss voltage clamping in battery-sensitive or low-voltage logic interfaces. |
| Reverse Leakage (IR) | 10 µA @ 40 V - Ensures minimal standby power loss in always-on automotive modules. |
| Junction Capacitance (Cd) | 5 pF @ 0 V - Minimizes signal distortion in RF detector or high-speed data line protection. |
| Thermal Resistance (Rth(j-a)) | 450 K/W - Defines temperature rise per watt on standard FR4; requires layout-aware power derating above ~270 mW. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control units and body electronics. |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm with flat leads. Marking bar indicates cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; connects to lower-potential node during conduction; marked by bar on top surface. |
| 2 | Anode (A) | Positive terminal; accepts forward bias from higher-potential source; unmarked side. |
Key Features
| Feature | Design Value |
|---|---|
| High switching speed | No minority carrier storage → <1 ns reverse recovery time; eliminates switching spikes in >1 MHz DC-DC controllers. |
| Low forward voltage | 380 mV @ 1 mA enables efficient clamping in 1.8 V/3.3 V logic rails without forward drop penalties. |
| Low leakage current | ≤1 µA @ 30 V ensures negligible quiescent current in always-on automotive sensors and CAN bus terminations. |
| Ultra-small SOD523 footprint | 1.2 mm × 0.8 mm area saves >60% board space vs. SOD323; compatible with 0201 reflow profiles. |
Applications
| Automotive Body Control Module | USB Power Delivery Clamp |
|---|---|
Use Scenario: Protects 12 V supply inputs from load dump transients in door module ECUs. IC Role / Device Role / Timing Role: Fast clamping diode shunting surge energy to ground during ISO 7637-2 pulse 5a events. Use Value: 40 V VR rating withstands 35 V peak transients; 120 mA IF handles sustained clamp current without thermal runaway. |
Use Scenario: Clamps VBUS overvoltage in USB-C PD sink applications up to 20 V. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between VBUS and GND near connector. Use Value: 5 pF capacitance avoids signal integrity degradation on CC and SBU lines; AEC-Q101 ensures field reliability. |
| Low-Power IoT Sensor Node | Industrial PLC Digital Input Protection |
Use Scenario: Freewheeling path for piezoelectric sensor bias current in battery-powered vibration monitors. IC Role / Device Role / Timing Role: Reverse-biased blocking diode preventing backfeed into ultra-low-quiescent LDOs. Use Value: 1 µA IR @ 30 V limits battery drain to <1 nA/hour; SOD523 fits within 2.0 mm² total PCB area. |
Use Scenario: Input stage protection for 24 V digital inputs exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Clamp diode parallel to optocoupler input, diverting >1 kV HBM ESD pulses. Use Value: AEC-Q101 qualification confirms robustness against repeated 8 kV contact discharge; 450 K/W Rth(j-a) allows direct PCB trace dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB521S-30T1G | 30 V VR, 200 mA IF, VF = 370 mV @ 1 mA; SOD-523 package; no AEC-Q101 certification. | Not qualified for automotive; suitable only for commercial-grade consumer or industrial non-safety systems. | Select when cost sensitivity outweighs automotive compliance and 40 V margin is unnecessary. |
| SD103ATW-7-F | 40 V VR, 200 mA IF, VF = 450 mV @ 10 mA; SOD-123 package (2.7 mm × 1.6 mm); AEC-Q101 qualified. | Larger footprint increases board area by 3.4×; higher VF increases conduction loss in low-current bias networks. | Choose when higher surge current handling (200 mA) is required and board space permits larger package. |
Compared with RB521S-30T1G and SD103ATW-7-F, the 1PS79SB40 uniquely balances 40 V rating, AEC-Q101 compliance, and minimal 1.2 mm × 0.8 mm footprint-making it optimal for space-constrained automotive and portable industrial nodes where both voltage margin and qualification matter.
Availability
1PS79SB40 is available at Aetrix Electronics and suitable for automotive body electronics, USB-C power delivery protection, and low-power IoT sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for 1PS79SB40 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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The 1PS79SB40 belongs to Nexperia's general-purpose Schottky diode portfolio, engineered specifically for ultra-compact, high-reliability clamping and switching in automotive-qualified and space-constrained power management applications.
FAQ
Is the 1PS79SB40 suitable for reverse polarity protection?
No. With only 40 V reverse voltage rating and no integrated series FET or dedicated protection architecture, it lacks the safe operating area and fault current handling needed for primary reverse polarity schemes. It functions strictly as a clamping or freewheeling diode-not a protection IC or ideal diode controller.
What is the maximum allowable power dissipation at 85 °C ambient?
At 85 °C ambient, junction temperature must stay ≤150 °C. With Rth(j-a) = 450 K/W, ΔT = 65 K allows max power of 144 mW. At VF = 500 mV and IF = 120 mA, dissipation is 60 mW-well within limit, confirming safe operation without derating at this temperature.
Does the marking 'T' correspond to the full part number 1PS79SB40?
Yes. Per Table 4 of the datasheet, the marking code 'T' is the sole top-side laser mark for 1PS79SB40 in SOD523 packaging. No secondary codes or date codes are included; 'T' is the complete and unique identifier for this variant.
Can the 1PS79SB40 replace BAS40 in existing designs?
Yes, with verification. Both are 40 V Schottky diodes in SOD-523, but 1PS79SB40 has lower VF (380 mV vs. BAS40's 430 mV @ 1 mA) and tighter IR spec (10 µA vs. 20 µA @ 40 V). Layout and thermal validation are required due to differing junction-to-ambient resistance (450 K/W vs. BAS40's 400 K/W).
1PS79SB40,115 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:
- 1 V @ 40 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 40 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C (Max)
1PS79SB40,115 FAQ
1.How can I place an order for 1PS79SB40,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PS79SB40,115 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 1PS79SB40,115 reliable?
The price and inventory of 1PS79SB40,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PS79SB40,115 is usually 5 days.
3.What payment methods are accepted for 1PS79SB40,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PS79SB40,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PS79SB40,115?
1PS79SB40,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PS79SB40,115 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 1PS79SB40,115?
For technical support, including 1PS79SB40,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PS79SB40,115 requirements.
6.How does Aetrix verify that 1PS79SB40,115 is sourced from the original manufacturer or authorized distributors?
All 1PS79SB40,115 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 1PS79SB40,115 meets industry standards.
7.What is the process for return or replacement of 1PS79SB40,115?
All 1PS79SB40,115 units undergo pre-shipment inspection (PSI). If there is an issue with 1PS79SB40,115, 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 1PS79SB40,115 part is unused and in its original packaging.
Return procedure for 1PS79SB40,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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