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onsemi SZ1SMB5923BT3G
- Part No.:
- SZ1SMB5923BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5923BT3G.pdf
- Description:
- DIODE ZENER 8.2V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,067
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Product details
Overview
SZ1SMB5923BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 8.2 V, maximum Zener impedance of 45.7 Ω at 3.5 mA test current, and reverse leakage current ≤0.5 μA at 6.5 V, designed for precision voltage regulation in automotive power supply rails and industrial sensor biasing circuits.
For engineers reviewing the SZ1SMB5923BT3G datasheet, pinout, applications, or equivalent options, this device serves as a stable, AEC−Q101 qualified voltage reference in space-constrained DC-DC feedback paths, overvoltage clamping nodes, and analog front-end protection stages where ±5% tolerance and <100°C/W thermal resistance are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified Zener test current (IZT) of 3.5 mA and maintains regulation across −65°C to +150°C junction temperature range. Its flat handling surface and modified L-bend leads support accurate placement on FR-4 PCBs using standard reflow profiles.
The device features Class 3 ESD rating (>16 kV HBM), UL 94 V-0 flammability compliance, and Pb-free construction per onsemi's environmental policy. Thermal resistance from junction-to-lead is 40°C/W, enabling 3.0 W dissipation at TL = 75°C with linear derating above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V (±5% tolerance at IZT = 3.5 mA; defines regulated output voltage in shunt regulator configurations) |
| Max Power Dissipation | 3.0 W @ TL = 75°C (supports continuous operation in high-ambient industrial environments with proper lead heat sinking) |
| Zener Impedance | 45.7 Ω max @ IZT = 3.5 mA (low dynamic impedance ensures minimal output voltage variation under load transients) |
| Reverse Leakage | ≤0.5 μA @ VR = 6.5 V (enables low-quiescent-current bias networks without significant error contribution) |
| Junction Temp Range | −65°C to +150°C (validates use in under-hood automotive modules and industrial motor control enclosures) |
| Thermal Resistance | 40°C/W (junction-to-lead); 226°C/W (junction-to-ambient) (guides PCB copper area design for thermal management) |
| ESD Rating | Class 3 (>16 kV HBM) (provides robustness against handling and system-level electrostatic discharge events) |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H), UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lowest potential point in shunt regulation topology; establishes reference for Zener breakdown voltage |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to input rail or signal node requiring clamping/regulation; voltage at this terminal is stabilized at VZ when reverse current ≥ IZK |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring zero-defect reliability |
| Flat handling surface | Enables consistent pick-and-place accuracy during automated SMT assembly, reducing tombstoning risk on fine-pitch boards |
| Modified L-bend leads | Increases solder joint contact area on PCB pads, improving mechanical strength and thermal conduction to copper pour |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) |
| Cathode polarity band | Unambiguous visual identification of cathode terminal for correct orientation during manual or automated placement |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamping | Industrial Sensor Signal Conditioning Bias |
|---|---|
Use Scenario: Protects 5 V microcontroller I/O pins from transient spikes on 12 V battery-supplied CAN bus interfaces in engine compartments. IC Role / Device Role / Timing Role: Shunt clamping element placed between MCU VIO rail and ground, conducting only during overvoltage events exceeding 8.2 V. Use Value: Limits peak voltage to ≤9.5 V with <0.5 μA leakage at 6.5 V, preserving signal integrity without loading the bias network. |
Use Scenario: Provides stable 8.2 V reference for op-amp biasing in 4–20 mA current loop transmitters operating in factory-floor environments. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end gain-setting resistors and ADC reference dividers. Use Value: Maintains ±5% regulation across −40°C to +105°C ambient, minimizing offset drift in temperature-sensitive measurement circuits. |
| Telecom Line Card Overvoltage Protection | Medical Diagnostic Equipment Power Sequencing |
Use Scenario: Guards Ethernet PHY interface ICs against induced surges on PoE-powered line cards exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage TVS + Zener cascade, absorbing energy after fast transient suppression. Use Value: Delivers 3 W steady-state dissipation capability and 45.7 Ω Zener impedance to hold clamped voltage within safe margin of PHY absolute maximum ratings. |
Use Scenario: Enables controlled power-up sequencing of FPGA and analog ASIC subsystems by regulating auxiliary 8.2 V supply rail in diagnostic imaging modules. IC Role / Device Role / Timing Role: Voltage supervisor reference element feeding into comparator-based reset generator circuitry. Use Value: Guarantees reliable reset assertion with <0.5 μA leakage, preventing false triggering during brown-out conditions in safety-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5923BT3G | Same electrical specs and SMB package, but not AEC−Q101 qualified; marking code 923B identical; no SZ prefix. | Intended for commercial/industrial use only; not validated for automotive temperature cycling or humidity testing. | Select when automotive qualification is unnecessary and cost sensitivity outweighs long-term reliability requirements. |
| BZX84-C8V2LT1G | Lower power rating (350 mW), SOT-23 package, ±5% tolerance, 8.2 V nominal; Zener impedance 30 Ω @ 5 mA. | Targeted at low-power portable electronics; unsuitable for >100 mA continuous clamp currents due to thermal limits. | Choose for space-constrained consumer devices where 3 W dissipation is excessive and board real estate is premium. |
Compared with 1SMB5923BT3G, SZ1SMB5923BT3G adds AEC−Q101 validation for automotive deployment, while BZX84-C8V2LT1G trades power capacity and thermal robustness for ultra-small footprint-making SZ1SMB5923BT3G optimal for ruggedized industrial and vehicle systems needing guaranteed 3 W regulation stability.
Availability
SZ1SMB5923BT3G is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor modules, telecom line card protection, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5923BT3G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1SMB5923BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G family of 3 W surface-mount Zener regulators engineered for high-reliability voltage reference and overvoltage protection in harsh-environment electronics.
FAQ
What is the Zener voltage tolerance for SZ1SMB5923BT3G?
The SZ1SMB5923BT3G has a Zener voltage tolerance of ±5%, with a nominal value of 8.2 V and a specified range of 7.79 V to 8.61 V at IZT = 3.5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies across the full operating temperature range. The SZ1SMB5923BT3G maintains this specification under both thermal equilibrium and transient conditions typical of automotive and industrial applications.
Is SZ1SMB5923BT3G suitable for automotive applications?
Yes, SZ1SMB5923BT3G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and infotainment power supplies. The "SZ" prefix explicitly denotes automotive-grade qualification, including extended temperature operation (−65°C to +150°C), humidity testing, and vibration endurance. The SZ1SMB5923BT3G meets these requirements without derating in under-hood environments up to 125°C ambient.
What is the maximum steady-state power dissipation for SZ1SMB5923BT3G?
The SZ1SMB5923BT3G delivers 3.0 W maximum steady-state power dissipation at a lead temperature (TL) of 75°C, with linear derating above that temperature at 25 mW/°C. At 25°C ambient, its power rating drops to 550 mW due to higher junction-to-ambient thermal resistance (226°C/W). This dual-rating behavior means the SZ1SMB5923BT3G must be mounted with adequate copper pour or thermal vias to sustain full 3 W operation in high-temperature deployments.
How does the Zener impedance of SZ1SMB5923BT3G affect regulation performance?
The SZ1SMB5923BT3G exhibits a maximum Zener impedance (ZZT) of 45.7 Ω at IZT = 3.5 mA, directly impacting output voltage stability under varying load currents. Lower ZZT minimizes ΔVZ = IZ × ZZT, ensuring tighter regulation during transient load steps. This value is measured at 60 Hz AC superimposed on DC bias and confirms the SZ1SMB5923BT3G's suitability for precision analog references where <1% voltage deviation is required across ±10% current variation.
What packaging and marking details identify SZ1SMB5923BT3G on the PCB?
The SZ1SMB5923BT3G uses the SMB (Case 403A) surface-mount package with a cathode polarity band and device marking "923B" laser-etched on the top surface. It ships in Pb-free tape-and-reel format (2500 units per reel) with "G" suffix indicating RoHS compliance. The physical dimensions are 3.56 mm × 4.32 mm × 1.02 mm, and the polarity band must align with the PCB silkscreen cathode indicator to ensure correct orientation during assembly of the SZ1SMB5923BT3G.
SZ1SMB5923BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 6.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5923BT3G FAQ
1.How can I place an order for SZ1SMB5923BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5923BT3G 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 SZ1SMB5923BT3G reliable?
The price and inventory of SZ1SMB5923BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5923BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5923BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5923BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5923BT3G?
SZ1SMB5923BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5923BT3G 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 SZ1SMB5923BT3G?
For technical support, including SZ1SMB5923BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5923BT3G requirements.
6.How does Aetrix verify that SZ1SMB5923BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5923BT3G 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 SZ1SMB5923BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5923BT3G?
All SZ1SMB5923BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5923BT3G, 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 SZ1SMB5923BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5923BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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