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Nexperia USA Inc. 1PS79SB70-QX
- Part No.:
- 1PS79SB70-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
1PS79SB70-QX.pdf
- Description:
- 1PS79SB70-Q/SOD523/SC-79
- Quantity:
- Payment:
- Shipping:
Inventory:7,715
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Product details
Overview
1PS79SB70-QX from Nexperia is a general-purpose Schottky diode in SOD523 (SC-79) package, rated for 70 V reverse voltage, 70 mA forward current, and 410 mV forward voltage at 1 mA, with 2 pF capacitance and AEC-Q101 qualification for automotive use.
For engineers reviewing the 1PS79SB70-QX datasheet, 1PS79SB70-QX pinout, 1PS79SB70-QX application, or 1PS79SB70-QX equivalent, this device supports ultra-high-speed switching and voltage clamping in space-constrained automotive ECUs, power rail protection circuits, and low-power sensor interfaces where low VF and fast recovery are critical.
Technical Context
This Schottky diode leverages a metal–semiconductor junction to achieve zero minority-carrier storage, enabling sub-nanosecond reverse recovery and minimal switching loss. Its 70 V VR rating and 100 nA IR at 50 V support reliable operation in 12 V/24 V automotive supply rails under transient conditions.
The device exhibits 450 K/W junction-to-ambient thermal resistance on FR4 PCBs and requires reflow soldering only. Its 2 pF capacitance at 0 V and 1 MHz enables stable high-frequency clamping without signal distortion in RF-coupled or clock-line protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 70 V - Withstands load-dump transients up to ISO 7637-2 Pulse 5a in 12 V automotive systems. |
| Forward Voltage (VF) | 410 mV @ 1 mA - Minimizes conduction loss in always-on bias networks and low-current clamp paths. |
| Reverse Current (IR) | 100 nA @ 50 V - Ensures negligible leakage in high-impedance sensing nodes and battery-backed circuits. |
| Capacitance (Cd) | 2 pF @ 0 V, 1 MHz - Preserves signal integrity in >100 MHz data lines and oscillator feedback paths. |
| Thermal Resistance (Rth(j-a)) | 450 K/W - Limits junction temperature rise to ≤67.5 °C above ambient at 70 mA continuous DC on standard FR4. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC-Q101 Rev G. |
Pinout & Package
SOD523 (SC-79) surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat leads, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to lower-potential node in clamping or rectification; marking bar identifies this terminal. |
| 2 | Anode (A) | Connected to higher-potential node; forward current flows from Pin 2 to Pin 1 when biased. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | SOD523 package saves >60% board area vs. SOD323, enabling dense routing in ADAS camera modules and compact ECUs. |
| Low forward voltage | 410 mV at 1 mA reduces power dissipation in always-on bias chains, extending battery life in keyless entry receivers. |
| High-speed switching | Zero stored charge enables <1 ns reverse recovery, eliminating ringing in PWM gate-drive snubbers and flyback catch diodes. |
| Automotive qualification | AEC-Q101 compliance ensures tested performance across −40 °C to +125 °C junction temperature range in engine control units. |
Applications
| Automotive Body Control Module | USB Port ESD Protection |
|---|---|
Use Scenario: Clamping induced transients on LIN bus lines during load dump events. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between LIN line and ground, conducting only during overvoltage excursions. Use Value: 70 V VR withstands ISO 7637-2 Pulse 5a (12 V system), while 2 pF Cd avoids signal degradation at LIN's 19.2 kbps baud rate. |
Use Scenario: Protecting USB 2.0 D+ and D− lines from IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance shunt diode connected anode-to-ground, diverting ESD current before IC input structures. Use Value: 2 pF Cd preserves signal edge integrity at 480 Mbps; 410 mV VF ensures clamping threshold remains below 0.7 V, protecting 3.3 V PHY inputs. |
| Low-Power Sensor Bias Network | RF Signal Path Clamp |
Use Scenario: Providing stable bias current to MEMS pressure sensor bridge while blocking reverse leakage. IC Role / Device Role / Timing Role: Forward-biased series diode in constant-current source path, isolating sensor from supply ripple. Use Value: 100 nA IR at 50 V prevents measurement drift in high-impedance Wheatstone bridges; 410 mV VF enables precise 1.2 V bias generation from 1.6 V LDO. |
Use Scenario: Preventing receiver front-end saturation from out-of-band RF energy in GPS/GLONASS antennas. IC Role / Device Role / Timing Role: Back-to-back Schottky pair (using two 1PS79SB70-QX) across RF line to ground, conducting only during peak overvoltage. Use Value: 2 pF Cd avoids detuning of 1.575 GHz antenna matching network; sub-ns recovery prevents harmonic generation in LNA input stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB521S-30T2R | 30 V VR, 200 mA IF, 370 mV VF @ 10 mA; SOD-523 package | Lower voltage rating limits use to 5 V logic rails; higher IF supports higher-clamp-energy events | Select when prioritizing lower VF and higher surge current over 70 V transient immunity |
| NSR0230HT1G | 30 V VR, 200 mA IF, 450 mV VF @ 100 mA; SOD-323 package | Larger SOD-323 footprint increases board area; higher VF increases conduction loss in low-current bias paths | Choose when existing layout uses SOD-323 and 30 V rating suffices for target application |
Compared with RB521S-30T2R and NSR0230HT1G, the 1PS79SB70-QX uniquely balances 70 V robustness, ultra-low capacitance, and AEC-Q101 qualification in the smallest SOD523 footprint-making it optimal for next-generation automotive domain controllers where voltage margin, size, and qualification are jointly constrained.
Availability
1PS79SB70-QX is available at Aetrix Electronics and suitable for automotive body control modules, USB interface protection circuits, low-power sensor bias networks, and RF front-end clamping requiring stable component supply and long-term lifecycle assurance.
Supply support for 1PS79SB70-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 technologies.
The 1PS79SB70-QX belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for space-constrained, high-reliability automotive signal conditioning and power rail protection applications.
FAQ
What is the maximum continuous forward current rating for 1PS79SB70-QX?
The absolute maximum continuous forward current (IF) is 70 mA at Tamb = 25 °C. Derating is required above 25 °C ambient: Rth(j-a) = 450 K/W implies junction temperature rises ~31.5 °C at 70 mA, limiting usable IF to ~55 mA at 85 °C ambient to stay within 150 °C Tj limit.
Is 1PS79SB70-QX suitable for bidirectional ESD protection?
No-1PS79SB70-QX is a unidirectional Schottky diode. For bidirectional ESD clamping, two devices must be used in series opposition (anode-to-anode or cathode-to-cathode), as confirmed in Nexperia's application note AN10784 for USB and RF line protection.
Does the marking 'G' on the device correspond to the 1PS79SB70-QX part number?
Yes-the marking code 'G' is the manufacturer-verified top-side laser mark for 1PS79SB70-QX, per Table 4 of the official Nexperia datasheet v.3 (2026-08-06); no other Nexperia Schottky diode shares this marking in SOD523 package.
Can 1PS79SB70-QX be hand-soldered using hot air?
No-Nexperia explicitly states in Section 13 that reflow soldering is the only recommended method. Hand-soldering risks thermal damage due to the device's small thermal mass and sensitivity to localized overheating; hot-air profiles exceeding 260 °C peak or >30 s dwell time may degrade junction integrity.
1PS79SB70-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):
- 70 V
- Current - Average Rectified (Io):
- 70mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 15 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 70 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- 150°C
1PS79SB70-QX FAQ
1.How can I place an order for 1PS79SB70-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PS79SB70-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 1PS79SB70-QX reliable?
The price and inventory of 1PS79SB70-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PS79SB70-QX is usually 5 days.
3.What payment methods are accepted for 1PS79SB70-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PS79SB70-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PS79SB70-QX?
1PS79SB70-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PS79SB70-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 1PS79SB70-QX?
For technical support, including 1PS79SB70-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PS79SB70-QX requirements.
6.How does Aetrix verify that 1PS79SB70-QX is sourced from the original manufacturer or authorized distributors?
All 1PS79SB70-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 1PS79SB70-QX meets industry standards.
7.What is the process for return or replacement of 1PS79SB70-QX?
All 1PS79SB70-QX units undergo pre-shipment inspection (PSI). If there is an issue with 1PS79SB70-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 1PS79SB70-QX part is unused and in its original packaging.
Return procedure for 1PS79SB70-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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