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onsemi SZ1SMB5952BT3G
- Part No.:
- SZ1SMB5952BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5952BT3G.pdf
- Description:
- DIODE ZENER 130V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:695
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Product details
Overview
SZ1SMB5952BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 130 V, ±5% tolerance, 2.9 mA test current (IZT), and maximum dynamic impedance of 5000 Ω at IZK; used for precision voltage regulation and overvoltage protection in automotive power supplies and industrial DC-DC converter feedback loops.
For engineers reviewing the SZ1SMB5952BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage stability at high reverse voltages, thermal derating above 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 in reverse-biased mode, maintaining stable output voltage across load and line variations. Its 130 V nominal Zener voltage targets high-voltage rail monitoring and clamping applications where standard 5–36 V Zeners are insufficient.
Thermal performance is defined by junction-to-lead resistance of 40 °C/W and 3.0 W steady-state dissipation at TL = 75°C, with linear derating to zero at 150°C. It exhibits Class 3 ESD robustness (>16 kV HBM) and meets UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 123.5 V (min) to 136.5 V (max) at IZT = 2.9 mA - defines regulation window under specified test conditions |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C - usable power limit with zero lead length; derates 25 mW/°C above 75°C |
| Zener Impedance (ZZT) | 5000 Ω max @ IZK = 0.25 mA - indicates voltage regulation sensitivity to low-current transients |
| Leakage Current (IR) | 0.25 μA max @ VR = 98.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Package | SMB (Case 403A) - standardized surface-mount outline with modified L-bend leads for reliable PCB solder joint formation |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
Pinout & Package
SMB package (Case 403A) features a cathode-indicated polarity band on the body; anode and cathode terminals are arranged in a single-row, two-terminal configuration optimized for top-side or bottom-side board mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias reference node | Connected to lower-potential side of regulated circuit; forms return path during Zener conduction |
| Cathode | Reverse voltage input / Regulated output node | Connected to higher-potential rail; delivers stable 130 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Zener Range | Supports 123.5–136.5 V regulation - enables direct clamping of 100–150 V DC bus rails without cascading diodes |
| AEC-Q101 Qualification | Validated for automotive under-hood environments - ensures long-term stability across −40°C to +125°C operating range |
| ESD Robustness | Class 3 (>16 kV HBM) - reduces risk of field failure due to handling or system-level electrostatic discharge events |
| Pb-Free Construction | RoHS-compliant and compatible with lead-free reflow profiles up to 260°C for 10 seconds - supports modern manufacturing standards |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial HV DC-DC Converter Feedback |
|---|---|
Use Scenario: Monitoring 120 V auxiliary battery rail in 48 V mild-hybrid vehicle systems to detect overvoltage faults before damaging downstream logic. IC Role / Device Role / Timing Role: Two-terminal voltage clamp and reference element in comparator-based fault detection circuit. Use Value: Tight 130 V ±5% tolerance ensures accurate trip point alignment without calibration; SMB footprint allows placement near high-voltage traces. |
Use Scenario: Providing stable reference voltage for optocoupler feedback loop in isolated 100–140 V output flyback converters used in factory automation controllers. IC Role / Device Role / Timing Role: Precision Zener reference replacing TL431 in high-voltage secondary-side regulation. Use Value: 5000 Ω ZZK at 0.25 mA enables stable biasing of optocoupler LED while minimizing quiescent current draw. |
| Telecom Line Card Surge Protection | Medical Imaging HV Supply Clamping |
Use Scenario: Secondary-stage clamping on -48 V telecom power distribution boards exposed to lightning-induced surges up to 100 V transient peaks. IC Role / Device Role / Timing Role: Standby shunt protector activated only during overvoltage events exceeding normal operating range. Use Value: 3.0 W peak dissipation capability handles short-duration surges; AEC-Q101 qualification correlates with extended lifetime under thermal cycling stress. |
Use Scenario: Overvoltage safeguard in X-ray generator power supplies where 130 V auxiliary rails feed timing control ICs sensitive to >10% excursion. IC Role / Device Role / Timing Role: Fail-safe voltage limiter placed directly at supply input of FPGA-based timing controller. Use Value: 0.25 μA leakage at 98.8 V prevents loading of high-impedance bias networks critical for nanosecond-level pulse synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5952BT3G | Same electrical specs and SMB package; lacks SZ-prefix AEC-Q101 qualification and automotive traceability controls | Approved for commercial/industrial use only; not suitable for automotive production programs requiring PPAP documentation | Select when cost sensitivity outweighs automotive compliance requirements and full lifecycle traceability is unnecessary |
| BZX84-C130LT1G | Lower power rating (350 mW), SOT-23 package, 130 V nominal Zener; higher ZZT (~200 Ω) but tighter 5% tolerance | Intended for low-power signal-level regulation; unsuitable for 3 W clamping or high-current transient suppression | Choose only for space-constrained, low-dissipation applications where thermal margin is not required |
Compared with SZ1SMB5952BT3G, 1SMB5952BT3G offers identical voltage and impedance performance but omits automotive qualification, while BZX84-C130LT1G trades power handling and package robustness for miniaturization - making SZ1SMB5952BT3G the sole option meeting both 3 W dissipation and AEC-Q101 requirements at 130 V.
Availability
SZ1SMB5952BT3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial HV power supply development, and medical imaging equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5952BT3G 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 silicon solutions for automotive, industrial, cloud, and IoT applications, with emphasis on reliability, safety, and sustainability.
The 1SMB59xxBT3G/SZ1SMB59xxT3G series was designed specifically for high-reliability voltage regulation and transient suppression in harsh-environment systems, especially those demanding AEC-Q101 compliance and Pb-free manufacturability.
FAQ
What is the Zener voltage tolerance of SZ1SMB5952BT3G?
The SZ1SMB5952BT3G has a ±5% Zener voltage tolerance, meaning its nominal 130 V rating spans 123.5 V (minimum) to 136.5 V (maximum) at the specified test current of 2.9 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.
Is SZ1SMB5952BT3G qualified for automotive applications?
Yes, SZ1SMB5952BT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, site-specific traceability, and extended reliability validation - distinguishing it from the commercial-grade 1SMB5952BT3G variant.
What is the maximum power dissipation for SZ1SMB5952BT3G at ambient temperature?
SZ1SMB5952BT3G dissipates up to 550 mW at TA = 25°C, with linear derating of 4.4 mW/°C above that temperature. However, its rated 3.0 W operation requires measurement at TL = 75°C (junction-to-lead), which assumes zero lead length and direct thermal coupling to a heatsink or copper plane - not ambient conditions.
Does SZ1SMB5952BT3G have Pb-free construction?
Yes, SZ1SMB5952BT3G is Pb-free and RoHS compliant, as indicated by the "G" suffix and confirmed in the Mechanical Characteristics and Ordering Information sections of the datasheet. It supports lead-free reflow soldering up to 260°C for 10 seconds and meets UL 94 V-0 flammability standards.
What is the leakage current specification for SZ1SMB5952BT3G?
SZ1SMB5952BT3G specifies a maximum reverse leakage current (IR) of 0.25 μA at VR = 98.8 V, per the Electrical Characteristics table. This low leakage ensures minimal parasitic loading in high-impedance reference circuits and contributes to stable regulation in precision feedback paths.
SZ1SMB5952BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 130 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 450 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 98.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5952BT3G FAQ
1.How can I place an order for SZ1SMB5952BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5952BT3G 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 SZ1SMB5952BT3G reliable?
The price and inventory of SZ1SMB5952BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5952BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5952BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5952BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5952BT3G?
SZ1SMB5952BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5952BT3G 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 SZ1SMB5952BT3G?
For technical support, including SZ1SMB5952BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5952BT3G requirements.
6.How does Aetrix verify that SZ1SMB5952BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5952BT3G 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 SZ1SMB5952BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5952BT3G?
All SZ1SMB5952BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5952BT3G, 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 SZ1SMB5952BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5952BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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