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onsemi SZ1SMB5922BT3G
- Part No.:
- SZ1SMB5922BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5922BT3G.pdf
- Description:
- DIODE ZENER 7.5V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
SZ1SMB5922BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 7.5 V (±5%), 50 Ω dynamic impedance at 3 mA test current, and 6 A maximum DC Zener current. It provides precise voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters and automotive control modules.
For engineers reviewing the SZ1SMB5922BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 7.5 V regulation tolerance, 3 W steady-state power dissipation at 75°C lead temperature, AEC−Q101 qualification for automotive use, and SMB package compatibility with standard reflow profiles.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its thermal resistance from junction-to-lead is 40 °C/W, enabling stable regulation under pulsed load conditions when mounted on copper pads per recommended footprint. The cathode polarity band ensures unambiguous orientation during automated placement.
The 7.5 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical θVZ ≈ +3.5 mV/°C near this rating. Its ESD rating exceeds 16 kV (HBM Class 3), supporting robust operation in noisy automotive environments without external transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.12–7.88 V @ IZT = 3 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C - maximum continuous power at lead temperature, derates 25 mW/°C above 75°C |
| Zener Impedance (ZZT) | 50 Ω @ IZT = 3 mA - low dynamic impedance ensures minimal output voltage variation under load transients |
| Max DC Zener Current (IZM) | 200 A - sets absolute upper limit for sustained reverse conduction without thermal runaway |
| Leakage Current (IR) | 0.5 μA @ VR = 6 V - guarantees negligible standby current in undervoltage detection circuits |
| Thermal Resistance (RJL) | 40 °C/W - enables direct thermal coupling to PCB copper for effective heat extraction |
| ESD Rating | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in board-level designs |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with modified L-bend leads, cathode indicated by polarity band. Dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H), UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower potential node; reverse bias applied between cathode and anode to activate regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail requiring stabilization; polarity band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive applications including engine control units and body electronics with full PPAP support |
| Pb−Free construction | RoHS-compliant packaging with solderable leads rated for 260°C/10 s reflow profile |
| Flat handling surface | Ensures coplanarity and accurate pick-and-place registration on SMT lines |
| Top/bottom board mounting | Package symmetry allows routing flexibility-no keep-out restrictions on either side of PCB |
| Void-free molded case | Prevents moisture ingress and delamination during thermal cycling in harsh environments |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier threshold. Use Value: Maintains ±1% output regulation across line/load/temperature with 50 Ω ZZT minimizing loop gain variation. |
Use Scenario: Clamping 12 V battery rail against load-dump transients in vehicle infotainment systems. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing surge energy before downstream ICs are damaged. Use Value: Withstands 200 A peak surge (per pulse rating curve) and 16 kV ESD, eliminating need for TVS co-location. |
| Programmable Reference Generator | Microcontroller Reset Circuit |
Use Scenario: Generating stable 7.5 V reference for ADC calibration in programmable logic controllers. IC Role / Device Role / Timing Role: Low-drift voltage source feeding precision resistor divider network. Use Value: 0.5 μA leakage at 6 V ensures <10 nA error current in high-impedance divider arms, preserving 12-bit accuracy. |
Use Scenario: Providing brown-out detection threshold for ARM Cortex-M microcontrollers in factory automation nodes. IC Role / Device Role / Timing Role: Threshold element triggering reset signal when supply drops below 7.12 V. Use Value: Tight 7.12–7.88 V tolerance band enables deterministic reset timing without external hysteresis components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5232BT1G | Same 7.5 V nominal rating but 500 mW power rating (SOD-123); ZZT = 30 Ω @ 20 mA | Lower power handling limits use to low-current references (<100 mA), not clamping or high-current regulation | Select when board space is constrained and thermal budget permits lower dissipation |
| BZX84-C7V5 | 7.5 V ±5%, 300 mW (SOT-23); ZZT = 30 Ω @ 5 mA; no AEC-Q101 qualification | Not qualified for automotive; unsuitable for under-hood or safety-critical modules | Choose only for cost-sensitive consumer-grade non-automotive applications with light loads |
Compared with MMSZ5232BT1G and BZX84-C7V5, SZ1SMB5922BT3G delivers 6× higher power capability and automotive qualification-enabling single-device solutions for 12 V rail protection and industrial feedback where reliability and thermal margin are critical.
Availability
SZ1SMB5922BT3G is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, and programmable logic controller reference circuits requiring stable component supply and long-term lifecycle continuity.
Supply support for SZ1SMB5922BT3G 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.
SZ1SMB5922BT3G belongs to the AEC−Q101-qualified SZ1SMB59xxT3G series-designed specifically for automotive and high-reliability industrial voltage regulation where robustness, precision, and long-term stability are mandatory.
FAQ
What is the Zener voltage tolerance of SZ1SMB5922BT3G?
The SZ1SMB5922BT3G has a Zener voltage tolerance of ±5% around its nominal 7.5 V rating, resulting in a guaranteed range of 7.12 V to 7.88 V at 3 mA test current (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies across the full operating temperature range of −65°C to +150°C.
Is SZ1SMB5922BT3G suitable for automotive applications?
Yes, SZ1SMB5922BT3G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and infotainment systems. The "SZ" prefix explicitly denotes compliance with automotive site and control change requirements, and the device meets stringent reliability and stress testing standards defined in the AEC−Q101 specification.
What is the maximum power dissipation for SZ1SMB5922BT3G at ambient temperature?
SZ1SMB5922BT3G dissipates up to 550 mW at TA = 25°C, with thermal resistance RJA = 226 °C/W. Power must be derated linearly above 25°C at 4.4 mW/°C. For higher-power operation, mounting on a thermally enhanced pad improves performance-its 3.0 W rating applies only when lead temperature (TL) is maintained at 75°C with proper PCB copper area.
How does the ESD rating of SZ1SMB5922BT3G impact system design?
SZ1SMB5922BT3G features Class 3 ESD protection (>16 kV per Human Body Model), allowing direct integration into exposed interfaces without additional ESD suppressors. This simplifies layout, reduces BOM count, and improves reliability in automotive and industrial environments where electrostatic discharge events are common-verified per JEDEC JS-001 test methodology.
What package type does SZ1SMB5922BT3G use, and what are its key mechanical features?
SZ1SMB5922BT3G uses the SMB (Case 403A) surface-mount package: 3.56 mm × 4.32 mm × 1.02 mm, with modified L-bend leads for increased solder joint area and void-free transfer-molded plastic construction. Its flat handling surface ensures placement accuracy, and polarity band marking prevents orientation errors during assembly-fully compliant with IPC-7351B footprint standards.
SZ1SMB5922BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 6 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
SZ1SMB5922BT3G FAQ
1.How can I place an order for SZ1SMB5922BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5922BT3G 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 SZ1SMB5922BT3G reliable?
The price and inventory of SZ1SMB5922BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5922BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5922BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5922BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5922BT3G?
SZ1SMB5922BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5922BT3G 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 SZ1SMB5922BT3G?
For technical support, including SZ1SMB5922BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5922BT3G requirements.
6.How does Aetrix verify that SZ1SMB5922BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5922BT3G 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 SZ1SMB5922BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5922BT3G?
All SZ1SMB5922BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5922BT3G, 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 SZ1SMB5922BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5922BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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