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onsemi BZX84C9V1ET1
- Part No.:
- BZX84C9V1ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C9V1ET1.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
BZX84C9V1ET1 from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 15 Ω dynamic impedance at 5 mA test current and 0.5 µA max reverse leakage at 7 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the BZX84C9V1ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification status, and Pb-free SOT-23 packaging compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at three test currents (1 mA, 5 mA, and 20 mA), with temperature coefficient of +3.8 mV/°C at 5 mA - indicating positive drift above 6 V. The second terminal (Pin 2) is internally unconnected, confirming true two-terminal functionality.
Thermal derating is linear at 1.8 mW/°C above 25°C on FR-5 board, and junction-to-ambient thermal resistance is 556 °C/W. Peak pulse power handling reaches 225 W for 8 × 20 µs waveform per Figure 9, enabling transient suppression capability beyond steady-state regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 9.1 V nominal, 8.5–9.6 V range at 5 mA - defines stable regulation point for biasing or reference circuits |
| Power Dissipation | 225 mW at TA = 25°C on FR-5 board - sets maximum continuous DC power before thermal derating begins |
| Zener Impedance | 15 Ω max at IZT = 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage | 0.5 µA max at VR = 7 V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
| Temperature Coefficient | +3.8 mV/°C at IZT = 5 mA - quantifies voltage drift with ambient temperature change |
| Capacitance | 130 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and AC signal coupling behavior |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports robustness in handheld and exposed interface applications |
Pinout & Package
SOT-23 surface-mount plastic package (Case 318, Style 8), void-free thermosetting material, UL 94 V-0 flammability rating, cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener operation (reverse bias) |
| 2 | No Connection | Internally unconnected; no electrical function - must remain floating on PCB |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical stress testing |
| Pb-Free Packaging | G-suffix indicates RoHS-compliant lead-free finish compatible with standard reflow profiles |
| High ESD Robustness | Withstands >16 kV per Human Body Model - reduces need for external ESD protection in space-constrained designs |
| Optimized for High-Density Layout | SOT-23 footprint (2.9 mm × 1.3 mm) enables placement near IC power pins without sacrificing board area |
| Controlled Zener Tolerance | ±5% VZ tolerance at 5 mA ensures predictable clamping level across production lots |
Applications
| Smartphone Power Rail Protection | USB Interface Voltage Clamp |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against ESD transients and overvoltage events during hot-plug. IC Role / Device Role / Timing Role: Two-terminal shunt regulator acting as fast-acting voltage limiter between VBUS and GND. Use Value: Leverages 0.5 µA leakage at 7 V and 130 pF capacitance to minimize standby current while maintaining sub-10 ns response to transients. |
Use Scenario: Providing stable 9.1 V reference for ADC biasing in portable medical sensor modules. IC Role / Device Role / Timing Role: Precision voltage reference source with +3.8 mV/°C TC compensated via system calibration. Use Value: Enables <1% full-scale error over −40°C to +85°C when paired with 16-bit ADC and linear compensation algorithm. |
| Automotive Cabin Control Panel | Industrial IoT Sensor Node |
Use Scenario: Regulating microcontroller I/O supply rail in 12 V automotive subsystems subject to load dump pulses. IC Role / Device Role / Timing Role: Overvoltage clamp protecting MCU GPIOs during ISO 7637-2 Pulse 5a events. Use Value: AEC-Q101 qualification and 225 W peak pulse rating allow direct integration without external TVS diodes. |
Use Scenario: Biasing photodiode amplifier in battery-powered environmental monitor operating at −25°C to +70°C. IC Role / Device Role / Timing Role: Low-leakage voltage reference establishing amplifier offset point in ultra-low-power sleep mode. Use Value: 0.5 µA max IR at 7 V ensures <1 nA contribution to total system sleep current, extending battery life by >12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5240BLT1 | 9.1 V nominal, ±5%, but 350 mW rating and 20 Ω ZT at 20 mA; SOT-23 package with same pinout | Higher power handling supports sustained 100 mA clamping; less suitable for ultra-low-leakage biasing | Select when higher pulse energy absorption is required and board layout allows same footprint |
| BZX84-C9V1,115 | 9.1 V nominal, ±5%, 250 mW rating, 15 Ω ZT at 5 mA; SOT-23, but non-AEC-Q101 and no Pb-free guarantee | Lacks automotive qualification and controlled Pb-free finish; acceptable for commercial-grade consumer products | Choose for cost-sensitive non-automotive applications where AEC-Q101 and RoHS are not mandatory |
Compared with MMBZ5240BLT1, BZX84C9V1ET1 offers tighter thermal resistance control (556 vs. ~400 °C/W) and guaranteed AEC-Q101 compliance, while BZX84-C9V1,115 trades qualification for marginally higher power rating but lacks traceable Pb-free assurance.
Availability
BZX84C9V1ET1 is available at Aetrix Electronics and suitable for smartphone power rail protection, USB interface voltage clamp, and automotive cabin control panel applications requiring stable component supply with full traceability and lifecycle management.
Supply support for BZX84C9V1ET1 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon-based solutions for automotive, industrial, cloud, and intelligent edge systems.
The BZX84C9V1ET1 belongs to the BZX84CxxxET1 Zener regulator family, designed specifically for compact, high-reliability voltage reference and overvoltage protection in space-constrained portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of BZX84C9V1ET1 at 5 mA test current?
The BZX84C9V1ET1 has a Zener voltage tolerance of ±5% at IZT = 5 mA, with a specified range of 8.5 V to 9.6 V. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, and applies directly to the BZX84C9V1ET1 part number under standard test conditions (TA = 25°C). The BZX84C9V1ET1 maintains this specification across its qualified production lots.
Is BZX84C9V1ET1 suitable for automotive applications?
Yes, BZX84C9V1ET1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including cabin control panels and body electronics. The BZX84C9V1ET1 meets stress testing requirements for temperature cycling, mechanical shock, and humidity exposure defined in AEC-Q101 Rev D. Its SOT-23 package and Pb-free construction further support automotive manufacturing standards.
What is the maximum reverse leakage current for BZX84C9V1ET1 at 7 V?
The maximum reverse leakage current for BZX84C9V1ET1 at VR = 7 V is 0.5 µA, as specified in the Electrical Characteristics table. This value is measured at TA = 25°C and reflects worst-case leakage across the qualified production range. The BZX84C9V1ET1 maintains this low leakage performance, supporting ultra-low-power design goals in battery-operated sensor nodes.
Does BZX84C9V1ET1 have an internal connection on Pin 2?
No, Pin 2 of the BZX84C9V1ET1 is internally unconnected (NC), as explicitly stated in the datasheet's pinout diagram and marking information. The BZX84C9V1ET1 functions as a true two-terminal device with only Pins 1 (Anode) and 3 (Cathode) electrically active. PCB layout must leave Pin 2 floating - no solder mask opening or copper connection should be made to it.
What is the thermal resistance junction-to-ambient for BZX84C9V1ET1 on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for BZX84C9V1ET1 on FR-5 board is 556 °C/W, as listed in the Maximum Ratings table. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board). The BZX84C9V1ET1 uses this RJA to define its 1.8 mW/°C derating slope above 25°C ambient temperature.
BZX84C9V1ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C9V1ET1 FAQ
1.How can I place an order for BZX84C9V1ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C9V1ET1 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 BZX84C9V1ET1 reliable?
The price and inventory of BZX84C9V1ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C9V1ET1 is usually 5 days.
3.What payment methods are accepted for BZX84C9V1ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C9V1ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C9V1ET1?
BZX84C9V1ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C9V1ET1 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 BZX84C9V1ET1?
For technical support, including BZX84C9V1ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C9V1ET1 requirements.
6.How does Aetrix verify that BZX84C9V1ET1 is sourced from the original manufacturer or authorized distributors?
All BZX84C9V1ET1 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 BZX84C9V1ET1 meets industry standards.
7.What is the process for return or replacement of BZX84C9V1ET1?
All BZX84C9V1ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C9V1ET1, 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 BZX84C9V1ET1 part is unused and in its original packaging.
Return procedure for BZX84C9V1ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C9V1ET1 Tags
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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