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onsemi SZESD9R3.3ST5G
- Part No.:
- SZESD9R3.3ST5G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-923
- Datasheet:
-
SZESD9R3.3ST5G.pdf
- Description:
- TVS DIODE 3.3VWM 7.8VC SOD923
- Quantity:
- Payment:
- Shipping:
Inventory:45,233
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Product details
Overview
SZESD9R3.3ST5G from onsemi is a unidirectional ESD protection diode designed for ultra-low-leakage, high-speed data line protection in human-body-sensor and wearable electronics interfaces. It features 3.3 V stand-off voltage, <1 nA reverse leakage (0°C to 50°C), 0.5 pF capacitance, 7.8 V clamping voltage at 1 A, and IEC 61000-4-2 Level 4 (±8 kV contact) compliance.
For engineers reviewing the SZESD9R3.3ST5G datasheet, pinout, applications, or equivalent options, key selection criteria include sub-1 nA leakage at elevated temperature, sub-1 pF signal-line capacitance, low clamping voltage under IEC ESD pulse, SOD-923 footprint compatibility, and AEC-Q101 qualification for automotive sensor nodes.
Technical Context
The SZESD9R3.3ST5G operates as a unidirectional transient voltage suppression diode with avalanche breakdown triggered by ESD events. Its design centers on rapid turn-on (<1 ns response) to clamp induced transients while maintaining minimal parasitic capacitance and leakage across industrial temperature ranges.
It is optimized for placement directly at I/O pads of ASSPs and ASICs handling analog sensor signals or low-power digital interfaces. The device uses silicon planar construction in a Pb-free SOD-923 package with cathode-band polarity marking and meets MSL 1 reflow requirements up to 260°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage | 3.3 V - blocks normal operating signals up to rated DC bias without conduction |
| Max Reverse Leakage | <1 nA @ 1 V, 0°C–50°C - preserves battery life and signal integrity in ultra-low-current sensor front-ends |
| Clamping Voltage | 7.8 V @ 1 A IEC pulse - limits transient overvoltage seen by protected IC to safe level during ±8 kV contact discharge |
| Capacitance | 0.5 pF @ 0 V, 1 MHz - enables use on >1 Gbps USB/MIPI lines without signal distortion or timing skew |
| ESD Rating | IEC 61000-4-2 Level 4: ±8 kV contact, ±15 kV air - certified system-level ESD robustness per international EMC standard |
| Package | SOD-923 (1.00 × 0.60 × 0.37 mm) - surface-mount footprint compatible with fine-pitch sensor module layouts |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling and HTRB stress |
Pinout & Package
SOD-923 package: 2-terminal, ultra-small outline diode with cathode marked by band on terminal 1. Body dimensions 1.00 mm × 0.60 mm × 0.37 mm, 100% matte tin lead finish, MSL 1, Pb-free and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded) | Cathode | Connected to protected I/O line; conducts during positive ESD transients to ground rail |
| 2 | Anode | Connected to system ground; completes clamping path during negative ESD transients |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low leakage | <1 nA over 0°C–50°C ensures negligible current drain in always-on wearable sensor nodes |
| Sub-1 pF capacitance | 0.5 pF minimizes insertion loss and reflection on high-speed serial links (e.g., MIPI D-PHY) |
| Fast response time | <1 ns turn-on enables clamping before ESD energy couples into sensitive core logic |
| AEC-Q101 qualification | Validated for automotive cabin and ADAS sensor modules requiring extended lifetime and thermal stability |
| Pb-free/halogen-free | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity |
Applications
| Wearable Biometric Sensors | Automotive Cabin Occupancy Detection |
|---|---|
Use Scenario: ESD protection on capacitive touch or impedance-based heart-rate monitor electrodes exposed to human contact. IC Role / Device Role: Unidirectional clamping diode placed between sensor analog front-end and MCU ADC input. Use Value: Prevents latch-up or gate oxide damage from ±8 kV human-body discharges while adding only 0.5 pF loading to 100 kHz bio-signal paths. | Use Scenario: Protecting ultrasonic or IR proximity sensors mounted near vehicle door handles or seat surfaces. IC Role / Device Role: I/O line protector on LIN or SENT interface pins subject to frequent user-handling ESD. Use Value: Maintains signal fidelity on 125 kbps LIN bus with <1 nA leakage ensuring stable biasing over -40°C to +85°C ambient. |
| Industrial IoT Edge Nodes | Medical Grade Patient Monitoring |
Use Scenario: Securing RS-485 or CAN FD transceiver I/O pins in battery-powered remote telemetry units. IC Role / Device Role: Secondary ESD shunt located at connector entry point ahead of primary TVS array. Use Value: Adds <0.5 pF parasitic capacitance-critical for preserving signal rise time on 5 Mbps CAN FD differential pairs. | Use Scenario: Protecting ECG electrode inputs in portable patient monitors where microvolt-level signal integrity is essential. IC Role / Device Role: First-stage ESD clamp on analog front-end multiplexer inputs prior to instrumentation amplifier. Use Value: Enables direct connection to dry-electrode skin interfaces without degrading common-mode rejection due to ultra-low leakage and matched capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD9L3.3ST5G | Bidirectional configuration; same 3.3 V VRWM but symmetric clamping (±7.8 V); 0.5 pF C, <1 nA IR | Required where both positive and negative transients must be clamped identically (e.g., USB D+/D−) | Select when bidirectional protection is mandated by interface standard-not drop-in replacement for unidirectional SZESD9R3.3ST5G |
| TPD1E10B06DPYR | 0.6 pF capacitance; 1.5 nA max IR @ 3.3 V; same SOD-923 package; ±12 kV IEC contact rating | Higher ESD rating suits harsher industrial environments but higher leakage may impact ultra-low-power sensor sleep modes | Prefer when system-level ESD test margin exceeds ±8 kV; verify leakage impact on battery runtime in always-on designs |
Compared with ESD9L3.3ST5G and TPD1E10B06DPYR, the SZESD9R3.3ST5G delivers optimal trade-off of unidirectional clamping, lowest leakage, and minimal capacitance for precision analog sensor interfaces where asymmetric transient threat models apply and power budget is constrained.
Availability
SZESD9R3.3ST5G is available at Aetrix Electronics and suitable for wearable biometric sensors, automotive cabin occupancy detection systems, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for SZESD9R3.3ST5G 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The ESD9R family-including SZESD9R3.3ST5G-is engineered specifically for ultra-low-leakage, high-speed ESD protection in space-constrained, battery-sensitive systems such as human-body sensors and automotive proximity detectors.
FAQ
What is the maximum reverse leakage current specification for SZESD9R3.3ST5G over temperature?
The SZESD9R3.3ST5G guarantees maximum reverse leakage current of <1 nA when measured at 1 V reverse bias across the full 0°C to 50°C operating range. This value is specified in the Electrical Characteristics table of the official onsemi datasheet (Rev. 3, February 2024) and is critical for preserving battery life in always-on wearable sensor applications where even nanoampere-level leakage impacts runtime.
Is SZESD9R3.3ST5G suitable for protecting high-speed USB 3.2 Gen 1 interfaces?
Yes, the SZESD9R3.3ST5G is suitable for USB 3.2 Gen 1 (5 Gbps) interfaces due to its 0.5 pF typical capacitance and unidirectional configuration, which minimizes signal distortion on the RX/TX differential pairs. Its clamping voltage of 7.8 V at 1 A ensures protected PHY circuitry remains within safe operating limits during IEC 61000-4-2 ESD events, making SZESD9R3.3ST5G a validated choice for compact USB Type-C port protection.
Does SZESD9R3.3ST5G have automotive qualification?
Yes, SZESD9R3.3ST5G carries the "SZ" prefix denoting AEC-Q101 qualification and PPAP capability. It has undergone stress testing per AEC-Q101 standards including HTGB, TC, and HTRB, confirming suitability for automotive cabin electronics such as occupancy detection sensors and infotainment touch controllers where reliability across -40°C to +125°C junction temperature is required.
What is the clamping voltage behavior of SZESD9R3.3ST5G under IEC 61000-4-2 testing?
The SZESD9R3.3ST5G exhibits a clamping voltage of 7.8 V when subjected to a 1 A peak current pulse matching the IEC 61000-4-2 waveform (Figure 5). This value is measured across the diode terminals during the 8/20 µs pulse and represents the maximum voltage imposed on the protected IC during an ±8 kV contact discharge event, as documented in the onsemi datasheet page 2 Electrical Characteristics table.
Can SZESD9R3.3ST5G be used in place of a bidirectional ESD diode like ESD9L3.3ST5G?
No-SZESD9R3.3ST5G is unidirectional and only clamps positive transients to ground; it does not protect against negative transients on the protected line. Substituting it for a bidirectional part like ESD9L3.3ST5G would leave the circuit vulnerable to negative ESD events. System-level validation is required before interchange, and SZESD9R3.3ST5G must only be used where the application's threat model confirms unidirectional transient exposure.
SZESD9R3.3ST5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOD-923
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 4.8V
- Voltage - Clamping (Max) @ Ipp:
- 7.8V
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 0.5pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-923
SZESD9R3.3ST5G FAQ
1.How can I place an order for SZESD9R3.3ST5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZESD9R3.3ST5G 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 SZESD9R3.3ST5G reliable?
The price and inventory of SZESD9R3.3ST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZESD9R3.3ST5G is usually 5 days.
3.What payment methods are accepted for SZESD9R3.3ST5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZESD9R3.3ST5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZESD9R3.3ST5G?
SZESD9R3.3ST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZESD9R3.3ST5G 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 SZESD9R3.3ST5G?
For technical support, including SZESD9R3.3ST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZESD9R3.3ST5G requirements.
6.How does Aetrix verify that SZESD9R3.3ST5G is sourced from the original manufacturer or authorized distributors?
All SZESD9R3.3ST5G 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 SZESD9R3.3ST5G meets industry standards.
7.What is the process for return or replacement of SZESD9R3.3ST5G?
All SZESD9R3.3ST5G units undergo pre-shipment inspection (PSI). If there is an issue with SZESD9R3.3ST5G, 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 SZESD9R3.3ST5G part is unused and in its original packaging.
Return procedure for SZESD9R3.3ST5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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