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onsemi SZ1SMB5953BT3G
- Part No.:
- SZ1SMB5953BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5953BT3G.pdf
- Description:
- DIODE ZENER 150V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SZ1SMB5953BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 150 V (±5%), maximum Zener impedance of 2.5 Ω at 600 mA test current, and reverse leakage current ≤0.25 μA at 121.6 V. It features AEC-Q101 qualification for automotive applications, ESD rating >16 kV (HBM), and SMB package with cathode polarity band.
For engineers reviewing the SZ1SMB5953BT3G datasheet, pinout, applications, or equivalent options, this device serves as a precision voltage reference and overvoltage clamp in DC power rails, automotive ECUs, and industrial sensor signal conditioning where stable 150 V regulation under 3 W steady-state dissipation is required.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage tolerance (±5%) and low dynamic impedance-2.5 Ω at IZT = 600 mA-enabling stable regulation under varying load conditions. Its thermal resistance from junction-to-lead is 40 °C/W, supporting reliable 3 W power dissipation at TL = 75 °C.
The device uses a void-free transfer-molded plastic SMB (Case 403A) package with modified L-bend leads for robust PCB bonding, UL 94 V-0 flammability rating, and Pb-free construction compliant with automotive PPAP requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 142.5 V min / 150 V nom / 157.5 V max - defines precise clamping threshold for 150 V rail protection |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - supports high-energy transient suppression without heatsink when lead temperature is controlled |
| Zener Impedance (ZZT) | 2.5 Ω @ IZT = 600 mA - ensures minimal voltage shift under load variation, critical for reference stability |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 121.6 V - guarantees negligible standby current in high-impedance sensing circuits |
| Thermal Resistance (RJL) | 40 °C/W - enables direct thermal path to PCB copper, simplifying thermal design for 3 W operation |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during automated assembly and field operation |
| AEC-Q101 Qualified | Yes - validated for automotive under-hood and body-control module environments per stress test requirements |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H); RoHS-compliant, Pb-free, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; establishes reference point for Zener breakdown |
| Cathode | Regulated output node | Delivers stable 150 V Zener voltage when reverse biased; marked with polarity band on package |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable clamping within 7.5 V of 150 V across production lots, reducing calibration overhead |
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity bias, and mechanical shock-no requalification needed for Tier 1 designs |
| 16 kV HBM ESD rating | Eliminates need for external ESD protection in board-level assembly and end-use environments |
| Flat handling surface | Enables accurate pick-and-place placement with <±0.1 mm X/Y deviation, improving SMT yield |
| Modified L-bend leads | Increases solder joint contact area by 35% vs. standard gull-wing, enhancing mechanical reliability under thermal cycling |
Applications
| Automotive Engine Control Unit (ECU) | Industrial DC Power Rail Protection |
|---|---|
Use Scenario: Clamping transient spikes on 12 V–48 V battery-fed microcontroller supply lines during load dump events. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting MCU VCC pins from >100 V surges. Use Value: Maintains regulation at 150 V with 2.5 Ω impedance, limiting peak voltage to safe levels without sacrificing response speed. |
Use Scenario: Stabilizing feedback node in isolated 150 V DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Precision Zener reference replacing TL431 in high-voltage error amplifier circuits. Use Value: Delivers ±5% accuracy and sub-μA leakage, enabling tight output voltage tolerance (<±1%) over temperature. |
| Medical Imaging Sensor Biasing | Telecom Line Card Surge Suppression |
Use Scenario: Providing stable bias voltage for avalanche photodiode (APD) arrays requiring 140–155 V operation. IC Role / Device Role / Timing Role: High-voltage reference source with low noise and minimal temperature drift. Use Value: Temperature coefficient optimized for 150 V range (≈+0.1 mV/°C), minimizing drift-induced gain error in analog front ends. |
Use Scenario: Secondary-stage clamping on -48 V telecom power feeds exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response overvoltage protector absorbing repetitive 10/1000 μs pulses up to 3 kW peak. Use Value: Withstands 6000 W surge power (non-repetitive) and maintains <0.25 μA leakage at 121.6 V, preserving standby integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5953BT3G | 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-controlled BOMs | Select when AEC-Q101 is not required and cost sensitivity outweighs automotive compliance needs |
| BZX85C150 | Through-hole DO-41 package; 1.3 W power rating; higher ZZT (10 Ω @ 200 mA); no AEC-Q101 or HBM ESD rating | Requires PCB through-hole mounting and additional thermal relief; unsuitable for high-density SMT layouts | Choose only for legacy through-hole designs where board rework is prohibitive and 150 V regulation suffices at lower power |
Compared with 1SMB5953BT3G and BZX85C150, SZ1SMB5953BT3G uniquely combines automotive qualification, 3 W surface-mount capability, and 2.5 Ω low-impedance regulation-enabling next-generation compact, high-reliability power management without layout or qualification trade-offs.
Availability
SZ1SMB5953BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial DC-DC converters, medical APD bias supplies, and telecom line card surge protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SZ1SMB5953BT3G 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.
SZ1SMB5953BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G series-engineered specifically for high-reliability voltage regulation and transient suppression in automotive and industrial systems demanding AEC-Q101 compliance and robust 3 W surface-mount performance.
FAQ
What is the Zener voltage tolerance of SZ1SMB5953BT3G?
The SZ1SMB5953BT3G has a Zener voltage tolerance of ±5%, meaning its nominal 150 V rating falls between 142.5 V and 157.5 V at IZT = 600 mA and TL = 30 °C. This tight tolerance is specified per onsemi's datasheet revision 10 (August 2021) and applies across the full operating temperature range of −65 °C to +150 °C.
Is SZ1SMB5953BT3G qualified for automotive applications?
Yes, SZ1SMB5953BT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, site-specific traceability, and extended reliability testing-including temperature cycling, humidity bias, and mechanical shock-making it suitable for engine control, ADAS, and body electronics.
What is the maximum steady-state power dissipation for SZ1SMB5953BT3G?
SZ1SMB5953BT3G delivers 3.0 W maximum steady-state power dissipation at TL = 75 °C with zero lead length, derating linearly above that temperature at 25 mW/°C. At TA = 25 °C, its power rating drops to 550 mW due to higher junction-to-ambient thermal resistance (226 °C/W).
Does SZ1SMB5953BT3G have ESD protection built-in?
Yes, SZ1SMB5953BT3G features an ESD rating of Class 3 (>16 kV) per Human Body Model (HBM), verified per JESD22-A114. This eliminates the need for external ESD protection components during handling, assembly, and field operation-critical for automotive and industrial environments.
What package type does SZ1SMB5953BT3G use?
SZ1SMB5953BT3G uses the SMB (Case 403A) surface-mount plastic package, measuring 3.56 mm × 4.32 mm × 1.02 mm. It features a cathode polarity band, modified L-bend leads for enhanced solder joint strength, UL 94 V-0 flammability rating, and Pb-free construction compliant with RoHS Directive 2011/65/EU.
SZ1SMB5953BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 150 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 600 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 114 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
SZ1SMB5953BT3G FAQ
1.How can I place an order for SZ1SMB5953BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5953BT3G 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 SZ1SMB5953BT3G reliable?
The price and inventory of SZ1SMB5953BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5953BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5953BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5953BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5953BT3G?
SZ1SMB5953BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5953BT3G 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 SZ1SMB5953BT3G?
For technical support, including SZ1SMB5953BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5953BT3G requirements.
6.How does Aetrix verify that SZ1SMB5953BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5953BT3G 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 SZ1SMB5953BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5953BT3G?
All SZ1SMB5953BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5953BT3G, 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 SZ1SMB5953BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5953BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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