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onsemi SZBZX84C75ET1G
- Part No.:
- SZBZX84C75ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C75ET1G.pdf
- Description:
- DIODE ZENER 75V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SZBZX84C75ET1G from onsemi is a 75 V, 250 mW Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 75 V at 5 mA test current, with dynamic impedance of 255 Ω at 5 mA and reverse leakage current ≤50 nA at 52.5 V, suitable for power supply reference and ESD clamp circuits.
For engineers reviewing the SZBZX84C75ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.3% at 75 V), temperature coefficient (+73.4 mV/°C), junction-to-ambient thermal resistance (500 °C/W on FR-5 board), and AEC-Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, featuring a non-repetitive peak pulse power rating of 225 W (8 × 20 µs) and ESD robustness rated Class 3 (>16 kV HBM). Its Zener breakdown mechanism provides stable regulation across −65 °C to +150 °C junction temperature range.
The SOT-23 package (Case 318, Style 8) uses Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode, enabling automated placement while maintaining low parasitic capacitance (35 pF at 0 V, 1 MHz). Thermal derating begins above 25 °C at 2.0 mW/°C on FR-5 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 70–79 V at 5 mA; ensures ±5.3% regulation window for 75 V nominal reference |
| Power Dissipation | 250 mW on FR-5 board; supports continuous operation in compact PCB layouts |
| Zener Impedance (ZZT) | 255 Ω at 5 mA; limits output voltage variation under load current changes |
| Reverse Leakage Current | ≤50 nA at 52.5 V; minimizes standby power loss in high-impedance bias networks |
| Temperature Coefficient | +73.4 mV/°C at 5 mA; enables predictable drift compensation in temperature-critical references |
| Capacitance | 35 pF at 0 V, 1 MHz; maintains signal integrity in RF-coupled clamp applications |
| ESD Rating | Class 3 (>16 kV HBM); provides built-in transient immunity without external protection |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Current entry terminal during forward conduction | Connected to lower-potential node in Zener regulation configuration |
| 2 (No Connection) | Unbonded internal lead | Electrically isolated; no PCB trace or pad required |
| 3 (Cathode) | Current exit terminal during Zener breakdown | Connected to regulated output or clamped node; marked by polarity band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling and humidity testing |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU; compatible with lead-free reflow soldering profiles up to 260 °C |
| High ESD Robustness | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Optimized for Automated Assembly | Standard SOT-23 footprint and marking support high-speed pick-and-place and AOI inspection |
| Low Capacitance Clamping | 35 pF capacitance enables fast transient response in data-line ESD protection |
Applications
| Automotive Power Supply Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stable 75 V reference for engine control unit (ECU) auxiliary rail monitoring. IC Role / Device Role / Timing Role: Zener voltage regulator providing fixed reference for ADC input scaling and comparator threshold setting. Use Value: Maintains ±5.3% voltage accuracy across −40 °C to +125 °C ambient, supporting AEC-Q100 Grade 2 compliance. |
Use Scenario: Precision voltage clamp for 4–20 mA transmitter loop-powered sensors. IC Role / Device Role / Timing Role: Overvoltage protection element limiting sensor interface voltage to 75 V during surge events. Use Value: 225 W peak pulse handling absorbs IEC 61000-4-5 Level 4 surges without degradation. |
| Portable Medical Device Power Management | Telecom Line Interface Protection |
Use Scenario: Low-power battery-operated glucose meter requiring stable analog reference. IC Role / Device Role / Timing Role: Low-leakage (≤50 nA) Zener reference for precision voltage divider in battery voltage sensing. Use Value: Enables >10-year shelf life via minimal standby current draw in always-on monitoring mode. |
Use Scenario: Secondary ESD clamp on Ethernet PHY differential pair termination resistors. IC Role / Device Role / Timing Role: Fast-response shunt protector diverting transients before reaching sensitive PHY IC inputs. Use Value: 35 pF capacitance avoids signal integrity degradation at 100BASE-TX frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C75ET1G | No AEC-Q101 qualification; standard commercial grade only | Lacks automotive reliability validation and PPAP documentation | Select when cost sensitivity outweighs automotive qualification requirements |
| MMSZ5267ET1G | 75 V nominal, but 500 mW rating and SOD-123 package (3.7 × 1.6 mm) | Higher power handling but larger footprint; not drop-in compatible | Choose for higher continuous dissipation where board area permits |
Compared with SZBZX84C75ET1G, BZX84C75ET1G offers identical electrical specs but lacks automotive qualification, while MMSZ5267ET1G trades smaller size for doubled power rating and incompatible packaging-neither is pin-compatible, requiring layout revision.
Availability
SZBZX84C75ET1G is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and portable medical devices requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SZBZX84C75ET1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with manufacturing and quality systems certified to IATF 16949.
The BZX84CxxxET1G/SZBZX84CxxxET1G series targets high-density, low-power voltage regulation and transient suppression, emphasizing automotive-grade reliability, small-form-factor integration, and compatibility with modern lead-free assembly processes.
FAQ
What is the Zener voltage tolerance of SZBZX84C75ET1G at 5 mA test current?
The SZBZX84C75ET1G has a Zener voltage range of 70 V to 79 V at 5 mA, corresponding to a ±5.3% tolerance around the nominal 75 V rating. This specification is verified per onsemi's Electrical Characteristics table on page 3 of the August 2024 datasheet, under test condition IZT1 = 5 mA.
Is SZBZX84C75ET1G qualified for automotive applications?
Yes, SZBZX84C75ET1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, distinguishing it from the commercial-grade BZX84C75ET1G variant.
What is the thermal resistance of SZBZX84C75ET1G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZBZX84C75ET1G is 500 °C/W when mounted on FR-5 board, with total power dissipation derated at 2.0 mW/°C above 25 °C ambient. This value is specified in the "Maximum Ratings" table on page 1 of the datasheet under "Total Power Dissipation on FR−5 Board."
Does SZBZX84C75ET1G have a no-connect pin, and how is it used in layout?
Yes, SZBZX84C75ET1G uses Pin 2 as a no-connection terminal, confirmed in the "Mechanical Characteristics" section and pinout diagram on page 2 of the datasheet. In PCB layout, Pin 2 must remain unconnected-no copper trace, pad, or thermal relief should be assigned to it to avoid unintended coupling or solder bridging.
What is the maximum reverse leakage current for SZBZX84C75ET1G, and at what voltage is it measured?
The maximum reverse leakage current for SZBZX84C75ET1G is 50 nA, measured at a reverse voltage (VR) of 52.5 V, which equals 70% of the nominal 75 V Zener voltage. This value is documented in the "ELECTRICAL CHARACTERISTICS" table on page 3, under the "Max Reverse Leakage Current" column for device SZBZX84C75ET1G.
SZBZX84C75ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84C75ET1G FAQ
1.How can I place an order for SZBZX84C75ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C75ET1G 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 SZBZX84C75ET1G reliable?
The price and inventory of SZBZX84C75ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C75ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C75ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C75ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C75ET1G?
SZBZX84C75ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C75ET1G 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 SZBZX84C75ET1G?
For technical support, including SZBZX84C75ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C75ET1G requirements.
6.How does Aetrix verify that SZBZX84C75ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C75ET1G 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 SZBZX84C75ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C75ET1G?
All SZBZX84C75ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C75ET1G, 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 SZBZX84C75ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C75ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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