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onsemi SZ1SMB5927BT3G
- Part No.:
- SZ1SMB5927BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5927BT3G.pdf
- Description:
- DIODE ZENER 12V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
SZ1SMB5927BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 12 V (±5%), maximum Zener impedance of 31.2 Ω at 6.5 mA test current, and reverse leakage current ≤0.25 μA at 9.1 V, designed for precision voltage regulation in automotive power rails and industrial DC-DC feedback loops.
For engineers reviewing the SZ1SMB5927BT3G datasheet, pinout, applications, or equivalent options, this device delivers stable 12 V reference performance under thermal stress up to +150°C, supports AEC-Q101-compliant automotive designs, and provides ESD robustness >16 kV HBM - critical for under-hood electronics and factory automation I/O protection.
Technical Context
This Zener regulator operates in reverse breakdown mode with tightly controlled VZ tolerance (±5%) and low dynamic impedance (31.2 Ω @ IZT = 6.5 mA), enabling accurate voltage clamping in feedback networks. Its SMB package features modified L-bend leads for high solder joint reliability and UL 94 V-0 flammability rating.
Thermal design is supported by RJA = 226 °C/W (at TA = 25°C) and RJL = 40 °C/W (at TL = 75°C), allowing 3.0 W steady-state dissipation at lead temperature ≤75°C. The device is Pb-free, AEC-Q101 qualified, and rated for operation from −65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal (11.4–12.6 V range); enables precise 12 V rail regulation in automotive and industrial supplies. |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C; supports sustained clamping in high-current transient suppression circuits. |
| Zener Impedance (ZZT) | 31.2 Ω @ IZT = 6.5 mA; ensures minimal output voltage variation under load changes in feedback paths. |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 9.1 V; guarantees low quiescent current in battery-backed or energy-sensitive systems. |
| ESD Rating | Class 3 (>16 kV HBM); protects downstream circuitry from electrostatic discharge in assembly and field environments. |
| Operating Temperature | −65°C to +150°C; validated for under-hood automotive, motor drive control, and industrial PLC modules. |
| Package | SMB (Case 403A); surface-mount footprint compatible with automated reflow processes and IPC-7351B land patterns. |
Pinout & Package
SMB package (Case 403A): 2-terminal surface-mount plastic case with cathode polarity band; dimensions: 4.32 mm × 2.30 mm × 1.02 mm (L × W × H); UL 94 V-0 rated; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to system ground or low-side return path; establishes reference potential for regulated output. |
| Cathode | Reverse breakdown terminal / Zener output node | Provides stable 12 V reference when reverse biased; connects to feedback point in switching regulator error amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring PPAP documentation. |
| Flat handling surface | Enables high-accuracy pick-and-place placement during SMT assembly, reducing tombstoning risk on fine-pitch PCBs. |
| Modified L-bend leads | Increases solder contact area on bond pads, improving mechanical strength and thermal transfer in high-vibration environments. |
| Zero-lead-length thermal resistance | RJL = 40 °C/W allows direct heat conduction from junction to PCB copper, supporting 3 W operation without heatsinking. |
| Polarity band marking | Visible cathode indicator ensures correct orientation during manual inspection and automated optical recognition (AOI). |
Applications
| Automotive Engine Control Unit (ECU) | Industrial DC-DC Converter Feedback |
|---|---|
Use Scenario: Regulating 12 V reference for microcontroller ADC reference and sensor biasing in engine management systems. IC Role / Device Role / Timing Role: Zener voltage reference diode providing stable 12 V input to analog front-end and power monitor ICs. Use Value: Maintains ±1% reference accuracy across −40°C to +125°C ambient, ensuring consistent fuel injection timing and OBD-II compliance. |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision Zener reference establishing regulated 12 V threshold for TL431-type shunt regulator feedback network. Use Value: Low 31.2 Ω Zener impedance minimizes output voltage drift under variable load, improving line/load regulation to ±0.5%. |
| Factory Automation I/O Protection | Medical Power Supply Overvoltage Clamp |
Use Scenario: Clamping 24 V digital input lines against ESD and inductive transients from solenoid drivers. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting FPGA GPIO and isolation barrier inputs. Use Value: 16 kV HBM ESD rating prevents latch-up in programmable logic controllers during maintenance and field service. |
Use Scenario: Secondary-side overvoltage protection in Class II medical AC/DC adapter supplying patient-connected monitoring equipment. IC Role / Device Role / Timing Role: Fail-safe Zener clamp limiting output to 12.6 V max during feedback loop failure. Use Value: UL 94 V-0 package and −65°C to +150°C operating range meet IEC 60601-1 creepage/clearance and thermal safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | 250 mW SOT-23 package; ZZT = 30 Ω @ 5 mA; VZ = 12 V ±5%; no AEC-Q101 qualification. | Lower power rating limits use to signal-level regulation only; unsuitable for 3 W clamping or automotive under-hood deployment. | Select when board space is constrained and power dissipation remains <250 mW; verify thermal margin in ambient >85°C. |
| MMSZ5242B-TP | 500 mW SOD-123 package; ZZT = 33 Ω @ 20 mA; VZ = 12 V ±5%; AEC-Q101 qualified but not PPAP capable. | Higher IZT shifts optimal regulation point; lower PD restricts surge handling in industrial motor drives. | Prefer for cost-sensitive consumer-grade 12 V references where PPAP documentation is not required. |
Compared with BZX84-C12LT1G and MMSZ5242B-TP, SZ1SMB5927BT3G uniquely combines 3 W power handling, AEC-Q101 + PPAP support, and 16 kV HBM ESD in an SMB package - making it the only option for production automotive voltage reference and high-reliability industrial clamping where thermal and qualification rigor are mandatory.
Availability
SZ1SMB5927BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial DC-DC converters, and factory automation I/O protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5927BT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
SZ1SMB5927BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G Zener regulator family, engineered specifically for high-reliability voltage reference and transient suppression in harsh-environment automotive and industrial power systems.
FAQ
What is the Zener voltage tolerance for SZ1SMB5927BT3G?
The SZ1SMB5927BT3G has a nominal Zener voltage of 12 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 11.4 V and 12.6 V at IZT = 6.5 mA and TL = 30°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies across the full operating temperature range.
Is SZ1SMB5927BT3G suitable for automotive applications?
Yes, SZ1SMB5927BT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Features section. Its −65°C to +150°C operating range, 16 kV HBM ESD rating, and Pb-free construction meet automotive electronics requirements for engine control, body control modules, and ADAS power domains.
What is the maximum power dissipation for SZ1SMB5927BT3G at 100°C ambient?
At TA = 100°C, SZ1SMB5927BT3G must be derated from its 550 mW rating at 25°C using the 4.4 mW/°C slope. This yields 550 mW − (4.4 mW/°C × 75°C) = 220 mW maximum continuous dissipation. For higher power, thermal management via PCB copper or lead temperature control (TL) is required per Figure 1.
Does SZ1SMB5927BT3G have a specified forward voltage?
Yes, the datasheet specifies VF ≤ 1.5 V at IF = 200 mA(dc) for all devices in the series, including SZ1SMB5927BT3G. This forward characteristic is relevant for reverse-polarity protection circuits where the diode conducts in forward bias during fault conditions.
What is the Zener impedance of SZ1SMB5927BT3G at low test current?
SZ1SMB5927BT3G has ZZK = 550 Ω at IZK = 1 mA, as listed in the Electrical Characteristics table. This higher impedance at low current reflects increased dynamic resistance near knee voltage, which impacts regulation accuracy in low-power reference circuits - designers should operate above IZT = 6.5 mA for optimal stability.
SZ1SMB5927BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 6.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5927BT3G FAQ
1.How can I place an order for SZ1SMB5927BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5927BT3G 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 SZ1SMB5927BT3G reliable?
The price and inventory of SZ1SMB5927BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5927BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5927BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5927BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5927BT3G?
SZ1SMB5927BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5927BT3G 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 SZ1SMB5927BT3G?
For technical support, including SZ1SMB5927BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5927BT3G requirements.
6.How does Aetrix verify that SZ1SMB5927BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5927BT3G 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 SZ1SMB5927BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5927BT3G?
All SZ1SMB5927BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5927BT3G, 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 SZ1SMB5927BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5927BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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