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onsemi SZBZX84C43ET1G
- Part No.:
- SZBZX84C43ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C43ET1G.pdf
- Description:
- DIODE ZENER 43V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,257
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Product details
Overview
SZBZX84C43ET1G from onsemi is a 43 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 43 V at 5 mA test current, with dynamic impedance of 150 Ω, ±5% tolerance, and −55 °C to +150 °C operating junction temperature range. It is used in power supply feedback loops, voltage reference circuits, and ESD-sensitive portable electronics.
For engineers reviewing the SZBZX84C43ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (500 °C/W on FR-5), peak pulse power (225 W), AEC-Q101 qualification, and Pb-free RoHS compliance.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when reverse-biased above its specified Zener voltage. Its electrical behavior is defined by three test points: VZ1 = 40–46 V @ IZT1 = 5 mA, VZ2 = 39.7–46 V @ IZT2 = 1 mA, and VZ3 = 40.1–46.5 V @ IZT3 = 20 mA - confirming stable regulation across load-current variations.
The diode exhibits a temperature coefficient of +30.1 to +46.6 mV/°C, indicating positive drift with temperature, and capacitance of 40 pF at 0 V bias and 1 MHz - critical for high-frequency noise suppression and transient response in regulator feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–46 V @ 5 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation | 250 mW on FR-5 board - sets maximum continuous DC power handling at 25 °C ambient |
| Zener Impedance (ZZT) | 150 Ω @ 5 mA - determines regulation stiffness and output voltage variation under load changes |
| Reverse Leakage Current | ≤50 nA @ 34 V - ensures minimal quiescent current in standby or undervoltage conditions |
| Capacitance | 40 pF @ 0 V, 1 MHz - impacts high-frequency bypassing and stability in feedback networks |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld and consumer interfaces without external protection |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by band; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Forward conduction terminal / Reverse-bias reference node | Connected to lower-potential side in Zener regulation; forms cathode-anode voltage drop defining VZ |
| 2 - No Connection | Internally unconnected lead | Must remain floating; no PCB trace or solder joint required - avoids unintended parasitic coupling |
| 3 - Cathode | Zener breakdown terminal / Regulation output node | Connected to regulated rail or feedback point; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation |
| 225 W peak pulse rating | Withstands 8 × 20 µs transients per IEC 61000-4-5 without degradation - suitable for surge-prone power rails |
| Pb-free & RoHS compliant | Meets global environmental regulations; compatible with lead-free reflow profiles up to 260 °C for 10 s |
| Small SOT-23 footprint | Enables placement on dense PCBs such as smartphone PMIC boards and wearable sensor modules |
| Low leakage (≤50 nA) | Minimizes error in high-impedance reference dividers and extends battery life in always-on circuits |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Zener reference element setting precise threshold for error amplifier comparison. Use Value: 43 V nominal breakdown enables 12 V or 24 V system overvoltage detection with margin; ±5% tolerance ensures consistent trip point across production lots. |
Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback in automotive door module actuators. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting transient energy before IC damage occurs. Use Value: 225 W peak pulse rating absorbs 8 × 20 µs surges per ISO 16750-2; Class 3 HBM rating eliminates need for discrete TVS in many designs. |
| Voltage Reference | Battery Monitoring |
Use Scenario: Providing stable reference for ADC measurement in industrial sensor signal conditioning circuitry. IC Role / Device Role / Timing Role: Precision analog reference source for ratiometric conversion of bridge sensors. Use Value: Low 40 pF capacitance prevents phase shift in op-amp buffer stages; +30.1 to +46.6 mV/°C TC allows predictable compensation in firmware. |
Use Scenario: Detecting end-of-charge or overvoltage condition in 36 V lithium-ion battery packs for e-bikes and scooters. IC Role / Device Role / Timing Role: Threshold detector triggering charge controller shutdown at 43 V pack voltage. Use Value: Tight 40–46 V VZ window ensures reliable detection within ±0.5 V of target; 150 Ω ZZT maintains accuracy under varying load currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C43ET1G | Same electrical specs and SOT-23 package but lacks AEC-Q101 qualification and automotive PPAP support | Not approved for automotive production; suitable only for commercial-grade consumer or industrial equipment | Select if automotive qualification is unnecessary and cost sensitivity outweighs long-term supply assurance |
| MMBZ5267BLT1 | 43 V Zener, 225 mW rating, 100 Ω ZZT, but rated only to +125 °C junction and not AEC-Q101 qualified | Limited to non-automotive applications due to lower temperature rating and absence of automotive stress testing | Choose when lower dynamic impedance is prioritized and extended temperature operation is not required |
Compared with SZBZX84C43ET1G, BZX84C43ET1G offers identical regulation performance but no automotive traceability, while MMBZ5267BLT1 trades 25 mW power headroom and 25 °C junction margin for slightly better impedance - making SZBZX84C43ET1G the sole choice for AEC-Q101-compliant designs needing full temperature and reliability coverage.
Availability
SZBZX84C43ET1G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor reference circuits, and portable device overvoltage protection requiring stable component supply across multi-year production cycles.
Supply support for SZBZX84C43ET1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C43ET1G belongs to the BZX84CxxxET1G/SZBZX84CxxxET1G family - engineered specifically for compact, high-reliability voltage regulation in automotive and high-density PCB environments.
FAQ
What is the Zener voltage tolerance of SZBZX84C43ET1G?
The SZBZX84C43ET1G has a nominal Zener voltage of 43 V with a minimum of 40 V and maximum of 46 V at 5 mA test current, corresponding to a ±5% tolerance band. This tolerance is verified per onsemi's Electrical Characteristics table on page 3 of the August 2024 datasheet, and applies under standard test conditions of TA = 25 °C. The SZBZX84C43ET1G maintains this specification across its qualified operating temperature range.
Is SZBZX84C43ET1G suitable for automotive applications?
Yes, SZBZX84C43ET1G is AEC-Q101 qualified and PPAP capable, with manufacturing site and control change requirements explicitly supported by the "SZ" prefix. It meets automotive reliability standards including high-temperature operation up to +150 °C junction temperature, robust ESD immunity (>16 kV HBM), and controlled process flow - making it appropriate for engine control units, body electronics, and ADAS power domains where SZBZX84C43ET1G is deployed.
What is the thermal resistance of SZBZX84C43ET1G on FR-5 board?
The thermal resistance from junction-to-ambient (RJA) for SZBZX84C43ET1G is 500 °C/W when mounted on an FR-5 board, as specified in the Maximum Ratings table on page 1 of the datasheet. This value assumes a standard 1.0 × 0.75 × 0.62 inch board and defines the temperature rise per milliwatt of dissipated power - critical for derating calculations in SZBZX84C43ET1G thermal design.
Does SZBZX84C43ET1G have a no-connect pin, and how should it be handled?
Yes, SZBZX84C43ET1G uses Pin 2 as a no-connect terminal, per the mechanical outline Style 8 and Electrical Characteristics note on page 2. This pin must remain unconnected on the PCB - no trace, pad, or solder joint should be assigned to it. Leaving Pin 2 floating avoids parasitic coupling and ensures accurate Zener regulation performance in the SZBZX84C43ET1G circuit implementation.
What is the maximum reverse leakage current for SZBZX84C43ET1G?
The maximum reverse leakage current (IR) for SZBZX84C43ET1G is 50 nA at VR = 34 V, as stated in the Electrical Characteristics table on page 3. This low leakage supports high-impedance reference applications and minimizes standby power loss - a confirmed parameter directly measured and published for SZBZX84C43ET1G, not extrapolated from adjacent variants.
SZBZX84C43ET1G 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):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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)
SZBZX84C43ET1G FAQ
1.How can I place an order for SZBZX84C43ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C43ET1G 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 SZBZX84C43ET1G reliable?
The price and inventory of SZBZX84C43ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C43ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C43ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C43ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C43ET1G?
SZBZX84C43ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C43ET1G 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 SZBZX84C43ET1G?
For technical support, including SZBZX84C43ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C43ET1G requirements.
6.How does Aetrix verify that SZBZX84C43ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C43ET1G 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 SZBZX84C43ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C43ET1G?
All SZBZX84C43ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C43ET1G, 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 SZBZX84C43ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C43ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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