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onsemi SZ1SMB5956BT3G
- Part No.:
- SZ1SMB5956BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5956BT3G.pdf
- Description:
- DIODE ZENER 200V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
SZ1SMB5956BT3G from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 200 V, ±5% tolerance, 1.9 mA test current (IZT), and maximum zener impedance of 8000 Ω at IZK = 1200 mA - used for precision voltage regulation and overvoltage protection in DC power supplies and industrial control circuits.
For engineers reviewing the SZ1SMB5956BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 200 V nominal breakdown, 3 W steady-state power rating at TL = 75°C, AEC−Q101 qualification for automotive use, and SMB package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified zener voltage (VZ = 190–210 V) while maintaining stable clamping under controlled current conditions. Its thermal resistance from junction-to-lead is 40 °C/W, enabling reliable power dissipation when mounted on thermally optimized PCBs.
The SZ1SMB5956BT3G features Class 3 ESD robustness (>16 kV HBM), UL 94 V−0 flammability rating, and Pb−free construction compliant with RoHS. It is rated for operation from −65 °C to +150 °C and supports both top-side and bottom-side board mounting due to its flat handling surface and modified L-bend leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 190–210 V (±5% tolerance; regulates at 200 V nominal under 1.9 mA test current) |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C (derates linearly above 75°C at 25 mW/°C; requires heatsinking or thermal pad design) |
| Zener Impedance (ZZK) | 8000 Ω max @ IZK = 1200 mA (indicates high dynamic impedance typical for high-voltage Zeners; impacts regulation accuracy under transient load) |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 152 V (ensures minimal standby current in high-impedance clamp circuits) |
| Thermal Resistance (RJL) | 40 °C/W (junction-to-lead; defines thermal path efficiency when soldered to copper pour or thermal pad) |
| ESD Rating | Class 3 (>16 kV HBM) (supports robust handling in automated manufacturing without additional ESD safeguards) |
| Operating Temperature | −65 °C to +150 °C (enables deployment in under-hood automotive, industrial motor drives, and outdoor power systems) |
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; Pb−free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower-potential rail during reverse-bias regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail; clamps voltage to 200 V when reverse current exceeds IZT |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control units and battery management systems |
| Flat handling surface | Enables precise pick-and-place placement and consistent coplanarity during reflow soldering |
| Modified L-bend leads | Increases solder joint area and mechanical reliability on FR-4 PCBs with standard footprint |
| ESD Class 3 (>16 kV HBM) | Eliminates need for upstream ESD protection in final assembly handling and board-level testing |
| Polarity band marking | Unambiguous cathode identification for error-free orientation in high-density layouts |
Applications
| Industrial Power Supply Clamping | Automotive Battery Protection |
|---|---|
|
Use Scenario: Clamp transient spikes on 24 V and 48 V DC bus lines in PLC power modules and motor drive inverters. IC Role / Device Role / Timing Role: Two-terminal passive voltage clamp; absorbs energy during load dump or inductive kickback events. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers by limiting bus voltage to ≤210 V peak. |
Use Scenario: Protect ADAS camera modules and infotainment ECUs against ISO 7637-2 Pulse 5a load-dump transients. IC Role / Device Role / Timing Role: Standalone overvoltage suppressor placed directly across battery input rails. Use Value: Withstands 300 V/100 ms pulses per ISO 7637-2 while maintaining <0.25 μA leakage at 152 V operating bias. |
| High-Voltage Reference Source | Telecom Line Card Surge Suppression |
|
Use Scenario: Provide stable 200 V reference for HV bias generation in optical transceiver TIA stages and laser driver feedback loops. IC Role / Device Role / Timing Role: Precision voltage reference element in series-shunt regulator topology. Use Value: ±5% tolerance and low TC drift above 100 V ensure repeatable bias point across temperature in telecom infrastructure. |
Use Scenario: Secondary surge protection stage on -48 V telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated after primary GDT or MOV limits initial surge. Use Value: 3 W power rating and 8000 Ω dynamic impedance enable controlled clamping without thermal runaway during multi-pulse events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5956BT3G | Same electrical specs and SMB package; lacks AEC−Q101 qualification and SZ-prefix automotive traceability | Approved for commercial/industrial use only; not suitable for automotive PPAP submissions | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| BZX85C200 | Through-hole DO-41 package; 1.5 W rating; 200 V ±5%; higher ZZK (10 kΩ) and lower IZM (125 mA) | Requires manual or wave-solder assembly; unsuitable for high-density SMT designs | Choose only for legacy through-hole designs or prototyping where thermal mass compensates for lower power rating |
Compared with 1SMB5956BT3G and BZX85C200, the SZ1SMB5956BT3G uniquely combines AEC−Q101 compliance, 3 W surface-mount capability, and 200 V regulation in a single validated automotive-grade component - eliminating qualification overhead and enabling direct drop-in use in safety-critical vehicle subsystems.
Availability
SZ1SMB5956BT3G is available at Aetrix Electronics and suitable for industrial power supply clamping, automotive battery protection, and telecom line card surge suppression requiring stable component supply, long-term lifecycle support, and AEC−Q101 traceability.
Supply support for SZ1SMB5956BT3G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZ1SMB59xxT3G series is designed specifically for high-reliability automotive and industrial voltage regulation - emphasizing AEC−Q101 qualification, robust thermal performance, and SMT manufacturability in harsh environments.
FAQ
What is the nominal zener voltage and tolerance of SZ1SMB5956BT3G?
The SZ1SMB5956BT3G has a nominal zener voltage of 200 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 190 V and 210 V when measured at IZT = 1.9 mA and TL = 30°C. This tight tolerance ensures predictable clamping behavior in precision voltage reference and overvoltage protection circuits using the SZ1SMB5956BT3G.
Is SZ1SMB5956BT3G qualified for automotive applications?
Yes, the SZ1SMB5956BT3G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. This makes the SZ1SMB5956BT3G suitable for use in engine control units, battery management systems, and ADAS modules where automotive-grade reliability is mandatory.
What is the maximum power dissipation of SZ1SMB5956BT3G and how does it derate with temperature?
The SZ1SMB5956BT3G delivers 3.0 W maximum steady-state power dissipation at TL = 75°C, derating linearly at 25 mW/°C above that temperature. At TA = 25°C, its power rating drops to 550 mW due to higher junction-to-ambient thermal resistance (226 °C/W). Effective thermal design - such as copper pour under the SMB pad - is essential to sustain full 3 W operation using the SZ1SMB5956BT3G.
What package type and mounting configuration does SZ1SMB5956BT3G use?
The SZ1SMB5956BT3G uses the SMB (Case 403A) surface-mount plastic package with a cathode polarity band, modified L-bend leads, and flat handling surface. It supports both top-side and bottom-side PCB mounting, and its dimensions (3.56 mm × 4.32 mm × 1.02 mm) match industry-standard SMB footprints - ensuring compatibility with automated SMT assembly lines when deploying the SZ1SMB5956BT3G.
How does the ESD rating of SZ1SMB5956BT3G impact manufacturing handling?
The SZ1SMB5956BT3G carries an ESD rating of Class 3 (>16 kV) per Human Body Model, allowing safe handling in standard factory environments without requiring special ESD workstations or packaging. This robustness reduces process risk during pick-and-place, reflow, and post-solder inspection - a key advantage when scaling production of systems relying on the SZ1SMB5956BT3G for voltage regulation.
SZ1SMB5956BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 200 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 1200 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 152 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
SZ1SMB5956BT3G FAQ
1.How can I place an order for SZ1SMB5956BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5956BT3G 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 SZ1SMB5956BT3G reliable?
The price and inventory of SZ1SMB5956BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5956BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5956BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5956BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5956BT3G?
SZ1SMB5956BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5956BT3G 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 SZ1SMB5956BT3G?
For technical support, including SZ1SMB5956BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5956BT3G requirements.
6.How does Aetrix verify that SZ1SMB5956BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5956BT3G 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 SZ1SMB5956BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5956BT3G?
All SZ1SMB5956BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5956BT3G, 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 SZ1SMB5956BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5956BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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