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onsemi SZ1SMB5947BT3G
- Part No.:
- SZ1SMB5947BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5947BT3G.pdf
- Description:
- DIODE ZENER 82V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,998
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Product details
Overview
SZ1SMB5947BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 82 V (±5%), maximum Zener impedance of 4.6 Ω at 160 mA test current, and reverse leakage current ≤0.25 μA at 62.2 V, designed for precision voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.
For engineers reviewing the SZ1SMB5947BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC−Q101 qualification, 16 kV HBM ESD rating, SMB package thermal resistance (RJA = 226 °C/W), and stable 82 V regulation under 75 °C lead temperature conditions.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon, with specified Zener voltage measured at IZT = 160 mA and thermal equilibrium at 30 °C. Its low dynamic impedance (4.6 Ω) ensures tight regulation across load transients in DC-DC feedback paths.
The SMB package enables top-side or bottom-side PCB mounting with modified L-bend leads for enhanced pad contact area and solder joint reliability. It supports steady-state power dissipation of 3.0 W at TL = 75 °C, derating linearly above that temperature at 25 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 77.9 V (min) to 86.1 V (max) at IZT = 160 mA - defines regulated output range for clamp or reference use |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - sets maximum continuous power handling with zero-lead-length thermal condition |
| Zener Impedance (ZZT) | 4.6 Ω max @ IZT = 160 mA - determines regulation accuracy under varying load current |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 62.2 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance (RJA) | 226 °C/W - quantifies junction-to-ambient heat transfer efficiency on FR-4 board with recommended footprint |
| ESD Rating | Class 3 (>16 kV) per HBM - confirms robustness against electrostatic discharge during handling and assembly |
| AEC−Q101 Qualified | Yes - validates suitability for automotive electronic control units requiring stress-tested reliability |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band, Pb-free, UL 94 V-0 rated, and modified L-bend leads for improved solder joint strength.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to system ground or lower-potential rail; forms reference return path in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail being clamped or referenced; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive under-hood and body-control module applications with extended temperature and life testing |
| 16 kV HBM ESD rating | Eliminates need for external ESD protection in board-level designs handling high-voltage transients |
| Flat handling surface | Enables precise pick-and-place placement accuracy during automated SMT assembly |
| Top- or bottom-side mounting capability | Supports flexible PCB layout in space-constrained modules where component height or routing access is limited |
| Void-free molded plastic case | Ensures consistent thermal performance and mechanical integrity across production lots and environmental cycling |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 12 V battery-supplied sensor interface lines against load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Shunt voltage regulator protecting analog front-end op-amps and ADC inputs. Use Value: Maintains signal integrity by limiting voltage excursions to ≤86.1 V while dissipating transient energy within 3 W thermal limit. |
Use Scenario: Protecting 24 V DC digital input channels from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Overvoltage clamp placed before optocoupler input stage. Use Value: Prevents false triggering and component damage with <0.25 μA leakage at 62.2 V, preserving input threshold accuracy. |
| Telecom Power Supply Feedback | Medical Diagnostic Equipment Bias Rail |
Use Scenario: Providing stable 82 V reference for isolated flyback converter secondary-side feedback loop. IC Role / Device Role / Timing Role: Precision Zener reference replacing TL431 in high-voltage auxiliary supplies. Use Value: Delivers ±5% tolerance and 4.6 Ω dynamic impedance to minimize output voltage drift under line/load variation. |
Use Scenario: Regulating high-voltage bias supply for photomultiplier tube (PMT) anode chains in imaging systems. IC Role / Device Role / Timing Role: Primary shunt regulator establishing clean, low-noise 82 V rail. Use Value: Enables stable gain calibration via ultra-low 0.25 μA leakage, reducing dark-current-induced measurement error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5947BT3G | Same electrical specs and SMB package, but not AEC−Q101 qualified; no SZ prefix. | Approved for commercial/industrial use only; excluded from automotive PPAP documentation. | Select when AEC−Q101 compliance is unnecessary and cost sensitivity outweighs automotive traceability requirements. |
| BZX84-C82LT1G | Lower power (350 mW), SOT-23 package, 82 V nominal, ±5% tolerance, ZZT = 70 Ω @ 5 mA. | Not suitable for >500 mA surge events; limited thermal mass prevents sustained 3 W operation. | Choose only for low-power bias references where board space is critical and peak power remains below 0.35 W. |
Compared with SZ1SMB5947BT3G, 1SMB5947BT3G offers identical regulation performance without automotive qualification overhead, while BZX84-C82LT1G trades power handling and thermal robustness for miniaturization-making it unsuitable as a direct replacement in high-energy clamp roles.
Availability
SZ1SMB5947BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controller (PLC) input stages, and medical diagnostic equipment requiring stable component supply with AEC−Q101 assurance and Pb-free compliance.
Supply support for SZ1SMB5947BT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1SMB5947BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G series - a family of 3 W surface-mount Zener regulators engineered specifically for automotive-grade voltage clamping and precision reference applications demanding high-reliability packaging and AEC−Q101 validation.
FAQ
What is the Zener voltage tolerance for SZ1SMB5947BT3G?
The SZ1SMB5947BT3G has a nominal Zener voltage of 82 V with a tolerance of ±5%, meaning the actual measured VZ falls between 77.9 V and 86.1 V when tested at IZT = 160 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 10, August 2021), and applies to all devices in the SZ1SMB59xxT3G series.
Is SZ1SMB5947BT3G suitable for automotive applications?
Yes, SZ1SMB5947BT3G is explicitly AEC−Q101 qualified and PPAP capable, as stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements. Its construction, testing, and traceability meet automotive reliability standards for under-hood and body electronics.
What is the maximum steady-state power dissipation for SZ1SMB5947BT3G?
The maximum steady-state power dissipation for SZ1SMB5947BT3G is 3.0 W at TL = 75 °C (measured at zero lead length), with a derating factor of 25 mW/°C above that temperature. This value is specified in the Maximum Ratings table on page 1 of the onsemi datasheet and reflects its capability as a 3 W Zener regulator in thermally constrained layouts.
Does SZ1SMB5947BT3G have ESD protection?
Yes, SZ1SMB5947BT3G features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as documented in the Features section of the onsemi datasheet. This high ESD immunity eliminates the need for additional discrete ESD protection components in many board-level designs handling high-voltage transients.
What is the reverse leakage current specification for SZ1SMB5947BT3G?
The reverse leakage current for SZ1SMB5947BT3G is specified as ≤0.25 μA at VR = 62.2 V (80% of nominal VZ), per the Electrical Characteristics table on page 3 of the onsemi datasheet. This low leakage ensures minimal loading on high-impedance bias networks and preserves accuracy in precision reference applications.
SZ1SMB5947BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 160 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 62.2 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
SZ1SMB5947BT3G FAQ
1.How can I place an order for SZ1SMB5947BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5947BT3G 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 SZ1SMB5947BT3G reliable?
The price and inventory of SZ1SMB5947BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5947BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5947BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5947BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5947BT3G?
SZ1SMB5947BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5947BT3G 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 SZ1SMB5947BT3G?
For technical support, including SZ1SMB5947BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5947BT3G requirements.
6.How does Aetrix verify that SZ1SMB5947BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5947BT3G 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 SZ1SMB5947BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5947BT3G?
All SZ1SMB5947BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5947BT3G, 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 SZ1SMB5947BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5947BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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