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onsemi SZ1SMB5931BT3G-VF01
- Part No.:
- SZ1SMB5931BT3G-VF01
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5931BT3G-VF01.pdf
- Description:
- DIODE ZENER 18V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:12,194
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Product details
Overview
SZ1SMB5931BT3G-VF01 from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 18 V (±5%), maximum Zener impedance of 20.8 Ω at 12 mA test current, and reverse leakage current ≤0.25 μA at 13.7 V, used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SZ1SMB5931BT3G-VF01 datasheet, pinout, applications, or equivalent options, key selection criteria include thermal derating above 75°C, AEC−Q101 qualification for automotive use, SMB package mechanical robustness, and ESD rating >16 kV per HBM.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its specified VZ. It exhibits a positive temperature coefficient above ~5 V, with typical θVZ ≈ +4.5 mV/°C for the 18 V variant, enabling stable regulation across −65°C to +150°C operating range.
Designed for surface-mount PCB assembly on FR-4, it uses a modified L-bend leadform for enhanced pad contact area and supports top-side or bottom-side mounting. Its void-free plastic case (UL 94 V−0) and Pb-free construction meet automotive PPAP requirements under AEC−Q101 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 12 mA - defines regulated output voltage tolerance band for stable DC rail clamping |
| Max Power Dissipation | 3.0 W @ TL = 75°C - usable power limit with zero-lead-length thermal condition; derates 25 mW/°C above 75°C |
| Zener Impedance (ZZT) | 20.8 Ω max @ IZT = 12 mA - determines AC ripple rejection and regulation stiffness under dynamic load changes |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 13.7 V - ensures minimal standby current draw in low-power hold-up or sensing circuits |
| Thermal Resistance (RJL) | 40 °C/W - quantifies junction-to-lead thermal path efficiency; critical for PCB copper pour design and thermal relief layout |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct integration into unshielded automotive subsystems without external ESD protection |
| AEC−Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and high-temperature operating life |
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 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to system ground or lower-potential rail; forms return path during Zener conduction |
| Cathode | Reverse breakdown terminal / Regulated output node | Connected to protected node; maintains voltage within ±5% of 18 V when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Supports higher-energy transient suppression and sustained regulation in 12–24 V automotive subsystems without external heatsinking |
| AEC−Q101 qualification | Validated for automotive engine control units, body electronics, and ADAS modules requiring extended temperature and lifetime reliability |
| ESD >16 kV (HBM) | Eliminates need for discrete TVS diodes in cost-sensitive infotainment and sensor interface designs exposed to handling ESD |
| Flat handling surface | Enables high-accuracy pick-and-place placement during automated SMT assembly, reducing tombstoning and misalignment risk |
| Pb-free and RoHS compliant | Meets global environmental compliance mandates and reflow soldering profiles up to 260°C for 10 seconds |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12 V microcontroller I/O pins from load-dump transients and battery reversal events in door module ECUs. IC Role / Device Role / Timing Role: Two-terminal voltage clamp placed between MCU pin and ground, absorbing surge energy while holding voltage ≤18.9 V. Use Value: Prevents latch-up and gate oxide damage in 3.3 V/5 V logic interfaces without adding series resistance or response delay. |
Use Scenario: Stabilizing analog input reference voltage for 0–10 V industrial sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Precision shunt regulator providing low-drift 18 V reference for op-amp biasing and ADC reference scaling. Use Value: Maintains <±0.5% output stability over −40°C to +85°C ambient, eliminating need for active voltage references in cost-optimized designs. |
| DC-DC Converter Feedback Clamp | Telecom Power Supply Overvoltage Protection |
Use Scenario: Clamping feedback node of isolated flyback converter to prevent secondary-side overvoltage during optocoupler failure. IC Role / Device Role / Timing Role: Fail-safe shunt element across TL431 reference divider, activating only if output exceeds 18.9 V. Use Value: Adds hardware-level redundancy to primary regulation loop, meeting IEC 62368-1 secondary circuit safety requirements. |
Use Scenario: Protecting 48 V telecom rectifier outputs against overvoltage faults caused by controller IC failure or communication loss. IC Role / Device Role / Timing Role: Primary-stage crowbar device triggering downstream fuse blow or MOSFET shutdown when bus exceeds 18.9 V threshold. Use Value: Limits fault energy to <100 mJ per event, preventing catastrophic capacitor rupture and fire hazard per UL 60950-1 Annex G. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5931BT3G | No AEC−Q101 qualification; same electrical specs and SMB package | Not approved for automotive production; suitable for industrial/commercial use only | Select when AEC−Q101 is not required and cost sensitivity outweighs automotive traceability needs |
| MMSZ5245B-TP | 500 mW rating, SOD-123 package, 15 V nominal VZ, no AEC−Q101 or HBM >16 kV | Lower power handling and smaller footprint; limited to low-energy signal-level clamping | Choose only for space-constrained non-automotive designs where 3 W dissipation is unnecessary |
Compared with 1SMB5931BT3G and MMSZ5245B-TP, SZ1SMB5931BT3G-VF01 uniquely combines automotive qualification, 3 W power capability, and industry-leading ESD robustness in the SMB form factor-making it the sole option for AEC-compliant 18 V rail protection in harsh environments.
Availability
SZ1SMB5931BT3G-VF01 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power supplies, and DC-DC converter safety systems requiring stable component supply and long-term lifecycle support.
Supply support for SZ1SMB5931BT3G-VF01 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.
SZ1SMB5931BT3G-VF01 belongs to the AEC−Q101-qualified SZ1SMB59xxT3G Zener regulator family, engineered specifically for automotive subsystems demanding high-reliability voltage clamping and robust ESD immunity in compact surface-mount packages.
FAQ
What is the Zener voltage tolerance for SZ1SMB5931BT3G-VF01?
The SZ1SMB5931BT3G-VF01 has a Zener voltage tolerance of ±5%, with a nominal value of 18 V and guaranteed range of 17.1 V to 18.9 V at IZT = 12 mA. This tolerance is defined per onsemi's type number designation standard and verified during production testing per AEC−Q101 requirements.
Is SZ1SMB5931BT3G-VF01 qualified for automotive applications?
Yes, SZ1SMB5931BT3G-VF01 is AEC−Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific change management, and full qualification across temperature cycling, high-temperature operating life, and unbiased highly accelerated stress test conditions.
What is the maximum power dissipation of SZ1SMB5931BT3G-VF01 at 100°C lead temperature?
At 100°C lead temperature, SZ1SMB5931BT3G-VF01 dissipates 2.375 W. This is calculated using the 25 mW/°C derating rate from the 3.0 W rating at 75°C: 3.0 W − (100 − 75) × 0.025 W = 2.375 W. Thermal design must ensure TL does not exceed this limit under worst-case ambient and airflow conditions.
Does SZ1SMB5931BT3G-VF01 have a specified forward voltage?
Yes, SZ1SMB5931BT3G-VF01 has a maximum forward voltage of 1.5 V at IF = 200 mA dc, as specified in the Electrical Characteristics table. This parameter applies during forward conduction mode and is relevant for polarity-check circuits or dual-use protection schemes involving bidirectional clamping.
What is the reverse leakage current specification for SZ1SMB5931BT3G-VF01 at 13.7 V?
The reverse leakage current for SZ1SMB5931BT3G-VF01 is guaranteed ≤0.25 μA at VR = 13.7 V, which is 76% of its nominal Zener voltage. This low leakage ensures minimal quiescent current draw in always-on automotive modules and preserves battery runtime in sleep-mode applications.
SZ1SMB5931BT3G-VF01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 12 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5931BT3G-VF01 FAQ
1.How can I place an order for SZ1SMB5931BT3G-VF01 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5931BT3G-VF01 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 SZ1SMB5931BT3G-VF01 reliable?
The price and inventory of SZ1SMB5931BT3G-VF01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5931BT3G-VF01 is usually 5 days.
3.What payment methods are accepted for SZ1SMB5931BT3G-VF01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5931BT3G-VF01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5931BT3G-VF01?
SZ1SMB5931BT3G-VF01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5931BT3G-VF01 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 SZ1SMB5931BT3G-VF01?
For technical support, including SZ1SMB5931BT3G-VF01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5931BT3G-VF01 requirements.
6.How does Aetrix verify that SZ1SMB5931BT3G-VF01 is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5931BT3G-VF01 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 SZ1SMB5931BT3G-VF01 meets industry standards.
7.What is the process for return or replacement of SZ1SMB5931BT3G-VF01?
All SZ1SMB5931BT3G-VF01 units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5931BT3G-VF01, 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 SZ1SMB5931BT3G-VF01 part is unused and in its original packaging.
Return procedure for SZ1SMB5931BT3G-VF01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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