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Nexperia USA Inc. 1PS79SB31-QX
- Part No.:
- 1PS79SB31-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
1PS79SB31-QX.pdf
- Description:
- DIODE SCHOTTKY 30V 200MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,629
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Product details
Overview
1PS79SB31-Q from Nexperia is a planar Schottky barrier diode in SOD523 (SC-79) package, rated for 30 V reverse voltage, 200 mA forward current, and 255–300 mV forward voltage at 10 mA/25 °C. It features guard ring protection, AEC-Q101 qualification, and is used in automotive-grade voltage clamping and low-power rectification in handheld devices.
For engineers reviewing the 1PS79SB31-Q datasheet, 1PS79SB31-Q pinout, 1PS79SB31-Q application, or 1PS79SB31-Q equivalent, key selection criteria include ultra-low VF at low IF, 30 V VR rating, SC-79 footprint compatibility, AEC-Q101 qualification status, and thermal resistance of 450 K/W in free air on FR4.
Technical Context
This Schottky diode employs a planar junction structure with integrated guard ring to suppress edge breakdown and ensure stable reverse leakage under automotive temperature cycling. Its low-barrier metal-semiconductor interface delivers sub-300 mV forward drop at 10 mA, enabling high-efficiency operation in battery-sensitive systems.
The device operates across −65 °C to +125 °C junction temperature range and exhibits 20–25 pF capacitance at 1 V reverse bias and 1 MHz, supporting ultra-high-speed switching up to ~1 GHz small-signal bandwidth. Reverse leakage remains ≤30 µA at 10 V and 25 °C under pulsed conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 30 V - Maximum DC blocking capability without breakdown; defines safe operating range in clamping and flyback circuits. |
| IF (Forward Current) | 200 mA continuous - Sustained conduction level suitable for low-current power rails and signal path protection. |
| VF @ 10 mA | 255–300 mV - Enables >95% efficiency in 3.3 V or lower supply rail rectification and clamping. |
| IR @ 10 V | ≤30 µA - Low leakage preserves battery life in always-on circuits and ensures minimal standby power loss. |
| Cd @ 1 V | 20–25 pF - Supports fast transient response in ESD protection and RF-coupled signal lines. |
| Rth(j-a) | 450 K/W - Thermal performance on single-sided FR4 PCB defines derating curve above 85 °C ambient. |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead profile optimized for space-constrained PCB layouts and automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Marked side with bar; connects to lower-potential node in forward conduction; anode-to-cathode polarity defines unidirectional current flow. |
| 2 | Anode (A) | Unmarked terminal; ties to higher-potential source during conduction; forms low-VF path when biased forward. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VF | 255–300 mV at 10 mA enables >96% efficiency in 3.3 V rail clamping and extends battery runtime in portable gear. |
| AEC-Q101 qualified | Stress-tested per automotive discrete standard - validated for under-hood and infotainment applications requiring reliability over 15-year vehicle life. |
| Guard ring protected | Edge termination structure prevents premature avalanche at junction periphery, ensuring stable IR and VR performance across temperature. |
| SOD523 footprint | 0.8 mm width and 1.2 mm length allow placement in <1.0 mm² board area - ideal for wearables and compact sensor modules. |
Applications
| Automotive Infotainment Power Rail Clamping | USB-C Port ESD Protection |
|---|---|
Use Scenario: Clamp transient spikes on 5 V USB power bus in head unit control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Fast-turn-on Schottky clamp shunts surge energy to ground before downstream LDOs or USB controllers are stressed. Use Value: 30 V VR rating withstands 24 V system transients; 255 mV VF minimizes voltage droop during clamping, preserving bus regulation. | Use Scenario: Protect CC and D+/D− lines in Type-C receptacles against IEC 61000-4-2 ±8 kV contact discharge events. IC Role / Device Role / Timing Role: Low-capacitance (22 pF typical) Schottky diode routes ESD current away from PHY while maintaining signal integrity. Use Value: 20–25 pF Cd at 1 V ensures <0.1 dB insertion loss at 480 Mbps USB 2.0; AEC-Q101 grade supports automotive USB compliance. |
| Low-Power Wearable Battery Charging Path | IoT Sensor Node Reverse Polarity Protection |
Use Scenario: OR-ing diode in coin-cell or thin-film battery charging circuit where forward loss directly impacts charge efficiency. IC Role / Device Role / Timing Role: Unidirectional conduction path isolates charger from battery during sleep mode; blocks reverse current at shutdown. Use Value: 255 mV VF at 1 mA reduces power loss by 60% vs. standard silicon diodes, extending usable charge cycle in sub-10 µA quiescent systems. | Use Scenario: Prevent damage from accidental battery reversal in battery-powered environmental sensors deployed in field enclosures. IC Role / Device Role / Timing Role: Series-connected anode-to-load cathode configuration blocks reverse current while adding minimal series resistance. Use Value: 200 mA IF rating supports peak sensor burst currents; SOD523 size fits within 2.0 mm × 2.0 mm module footprint constraints. |
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 | Same SOD-523 package; VF = 270–320 mV @ 10 mA; VR = 30 V; not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial wearables but not under-hood use. | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs. |
| Vishay VS-2EDH01HM3/H | SOD-323 package (1.7 × 1.3 mm); VF = 350–420 mV @ 10 mA; VR = 30 V; AEC-Q101 qualified. | Larger footprint and higher VF reduce board density and efficiency in space-constrained designs. | Choose only if existing layout uses SOD-323 or higher surge current (IFSM = 2 A) is mandatory. |
Compared with NSR0230HT1G and VS-2EDH01HM3/H, the 1PS79SB31-Q uniquely combines AEC-Q101 qualification, SOD523 size, and sub-300 mV VF - making it optimal for automotive and ultra-compact battery-powered systems where both reliability and efficiency are non-negotiable.
Availability
1PS79SB31-Q is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-C ESD protection modules, and low-power wearable battery management requiring stable component supply across extended product lifecycles.
Supply support for 1PS79SB31-Q 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 essential semiconductors - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The 1PS79SB31-Q belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for automotive power rail protection and ultra-low-power rectification where space, efficiency, and qualification rigor are critical.
FAQ
What is the maximum junction temperature for continuous operation?
The 1PS79SB31-Q has a maximum junction temperature (Tj) of 125 °C under continuous forward conduction. Operation beyond this limit risks permanent degradation of the Schottky barrier and increased reverse leakage. Derating is required above 85 °C ambient, based on its 450 K/W thermal resistance on FR4 PCB.
Is the marking 'G3' sufficient to identify this part on the PCB?
Yes - 'G3' is the official top-side marking for 1PS79SB31-Q per Nexperia's ordering information table. The bar adjacent to pin 1 identifies the cathode, confirming orientation during visual inspection and automated optical recognition (AOI) in SMT lines.
Can this diode replace a standard silicon diode in a 3.3 V LDO input protection circuit?
Yes - with VF as low as 255 mV at 10 mA, the 1PS79SB31-Q reduces forward drop by ~550 mV versus typical silicon diodes, minimizing input-to-output voltage loss and improving dropout margin. Its 30 V VR rating also exceeds typical 3.3 V rail surge requirements.
Does the AEC-Q101 qualification cover solder reflow profiles?
Yes - AEC-Q101 qualification includes JEDEC J-STD-020-compliant reflow testing (up to 260 °C peak). The 1PS79SB31-Q's SC-79 package is validated for standard lead-free reflow profiles, including ramp-to-spike and time-above-liquidus specifications defined in the datasheet's "Soldering" section.
1PS79SB31-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):
- 30 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 30 µA @ 10 V
- Capacitance @ Vr, F:
- 25pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 125°C
1PS79SB31-QX FAQ
1.How can I place an order for 1PS79SB31-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PS79SB31-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 1PS79SB31-QX reliable?
The price and inventory of 1PS79SB31-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PS79SB31-QX is usually 5 days.
3.What payment methods are accepted for 1PS79SB31-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PS79SB31-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PS79SB31-QX?
1PS79SB31-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PS79SB31-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 1PS79SB31-QX?
For technical support, including 1PS79SB31-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PS79SB31-QX requirements.
6.How does Aetrix verify that 1PS79SB31-QX is sourced from the original manufacturer or authorized distributors?
All 1PS79SB31-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 1PS79SB31-QX meets industry standards.
7.What is the process for return or replacement of 1PS79SB31-QX?
All 1PS79SB31-QX units undergo pre-shipment inspection (PSI). If there is an issue with 1PS79SB31-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 1PS79SB31-QX part is unused and in its original packaging.
Return procedure for 1PS79SB31-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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