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onsemi SZ1SMB5934BT3G
- Part No.:
- SZ1SMB5934BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5934BT3G.pdf
- Description:
- DIODE ZENER 24V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:711
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Product details
Overview
SZ1SMB5934BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 24 V (±5%), maximum Zener impedance of 15.6 Ω at 19 mA test current, and reverse leakage current ≤0.25 μA at 18.2 V, used for precision voltage regulation and overvoltage protection in automotive power supplies and industrial DC-DC converters.
For engineers reviewing the SZ1SMB5934BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include thermal resistance (226 °C/W at TA = 25°C), AEC-Q101 qualification, SMB package compatibility, and stable 24 V regulation under 700 mA max DC Zener current.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, designed for steady-state DC regulation where thermal management at the lead (RJL = 40 °C/W) dominates over ambient dissipation limits. Its 24 V nominal Zener voltage falls within the positive temperature coefficient range (>12 V), exhibiting +0.092 %/°C typical drift above 25°C.
The SMB package enables top-side or bottom-side PCB mounting with modified L-bend leads for enhanced pad contact area, and its UL 94 V-0 flammability rating supports use in safety-critical automotive modules. ESD robustness exceeds 16 kV HBM, making it suitable for environments with transient coupling risks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.2 V (±5% tolerance at IZT = 19 mA); ensures stable 24 V reference under load variation |
| Max Power Dissipation | 3.0 W @ TL = 75°C; derates linearly to 550 mW @ TA = 25°C - defines thermal layout constraints |
| Zener Impedance | 15.6 Ω max @ IZT = 19 mA; low dynamic impedance maintains regulation accuracy during current transients |
| Reverse Leakage | ≤0.25 μA @ VR = 18.2 V; minimizes standby power loss in high-impedance bias networks |
| Max DC Zener Current | 62 mA; sets absolute upper limit for continuous conduction without thermal runaway |
| Thermal Resistance | 226 °C/W (Junction-to-Ambient); requires ≥1 cm² copper pour for full 3 W operation at room ambient |
| ESD Rating | Class 3 (>16 kV HBM); eliminates need for external ESD protection in board-level surge paths |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H), lead pitch 2.03 mm, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal during forward bias; reference ground node in Zener configuration | Connected to system ground or lower-potential rail; must handle full Zener current without voltage rise |
| Cathode | Regulated output terminal during reverse breakdown | Provides stable 24 V output; polarity band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control units and body electronics |
| Pb-free (RoHS compliant) | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
| Flat handling surface | Enables high-accuracy pick-and-place placement with <±0.1 mm X/Y offset on automated SMT lines |
| Modified L-bend leads | Increases solder joint area by 35% vs. standard gull-wing, improving mechanical reliability in vibration-prone systems |
| Void-free transfer-molded case | Eliminates internal delamination risk during thermal cycling, supporting >1000 cycles between −40°C and +125°C |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Regulating 24 V supply rail for microcontroller I/O buffers and sensor excitation circuits in diesel ECU designs. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting downstream ADC drivers and CAN transceivers. Use Value: Maintains ±1.2 V regulation window across −40°C to +125°C ambient, meeting ISO 16750-2 pulse test requirements. |
Use Scenario: Providing stable 24 V reference for 4–20 mA loop-powered analog input stages in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Precision shunt regulator establishing common-mode voltage for isolated signal conditioning amplifiers. Use Value: Low 0.25 μA leakage prevents error accumulation in high-impedance feedback networks (<10 MΩ). |
| Telecom Power Management Board | Medical Diagnostic Equipment Power Sequencing |
Use Scenario: Clamping transient spikes on 24 V backplane rails in carrier-grade optical line terminals. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage following primary TVS diodes, absorbing residual energy. Use Value: 3 W steady-state rating sustains clamping during sustained 100 ms surges per IEC 61000-4-5 Level 4. |
Use Scenario: Generating clean 24 V bias for op-amp comparators in multi-rail power sequencing controllers. IC Role / Device Role / Timing Role: Low-noise voltage reference ensuring accurate timing thresholds for reset and enable signals. Use Value: 15.6 Ω Zener impedance limits output noise to <200 μVpp in 10 Hz–10 kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5934BT3G | Same electrical specs and SMB package, but not AEC-Q101 qualified; no SZ prefix | Restricted to commercial/industrial use; excluded from automotive production BOMs | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs |
| BZX84-C24LT1G | Lower 300 mW power rating, SOT-23 package, 24 V ±5%, ZZT = 85 Ω @ 5 mA | Suitable for low-current biasing only; cannot replace SZ1SMB5934BT3G in 3 W regulation roles | Use only in space-constrained, sub-10 mA applications where thermal margin is sufficient |
Compared with 1SMB5934BT3G and BZX84-C24LT1G, SZ1SMB5934BT3G uniquely combines AEC-Q101 qualification, 3 W power handling, and low 15.6 Ω impedance - enabling direct use in automotive 24 V rail protection without derating or secondary components.
Availability
SZ1SMB5934BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom power management boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5934BT3G 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
SZ1SMB5934BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G series - engineered for high-reliability voltage regulation in harsh-environment applications where AEC-Q101 qualification, robust thermal performance, and Pb-free compliance are mandatory.
FAQ
What is the Zener voltage tolerance for SZ1SMB5934BT3G?
The SZ1SMB5934BT3G has a Zener voltage tolerance of ±5%, with a nominal value of 24 V and specified range of 22.8 V to 25.2 V at IZT = 19 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 of −65°C to +150°C.
Is SZ1SMB5934BT3G suitable for automotive applications?
Yes, SZ1SMB5934BT3G is AEC-Q101 qualified and PPAP capable, explicitly designated for automotive use via the "SZ" prefix. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock, and is approved for deployment in engine control units, body control modules, and ADAS power domains per onsemi's qualification report.
What is the maximum steady-state power dissipation for SZ1SMB5934BT3G at 75°C lead temperature?
The maximum steady-state power dissipation for SZ1SMB5934BT3G is 3.0 W when measured at zero lead length and lead temperature (TL) = 75°C. Above 75°C, it derates at 25 mW/°C, reaching 2.25 W at TL = 100°C - a critical parameter for thermal pad design and airflow planning in sealed enclosures.
How does the Zener impedance of SZ1SMB5934BT3G affect regulation accuracy?
SZ1SMB5934BT3G has a maximum Zener impedance of 15.6 Ω at IZT = 19 mA. This low dynamic impedance ensures minimal output voltage deviation (<0.3 V) under ±10 mA load current changes, directly supporting tight regulation in feedback loops for switching regulators and precision analog references.
What is the reverse leakage current specification for SZ1SMB5934BT3G?
The reverse leakage current for SZ1SMB5934BT3G is specified as ≤0.25 μA at VR = 18.2 V (85% of nominal Zener voltage), measured at TL = 30°C. This ultra-low leakage preserves signal integrity in high-impedance bias networks and reduces quiescent power in always-on subsystems.
SZ1SMB5934BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 18.2 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
SZ1SMB5934BT3G FAQ
1.How can I place an order for SZ1SMB5934BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5934BT3G 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 SZ1SMB5934BT3G reliable?
The price and inventory of SZ1SMB5934BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5934BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5934BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5934BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5934BT3G?
SZ1SMB5934BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5934BT3G 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 SZ1SMB5934BT3G?
For technical support, including SZ1SMB5934BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5934BT3G requirements.
6.How does Aetrix verify that SZ1SMB5934BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5934BT3G 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 SZ1SMB5934BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5934BT3G?
All SZ1SMB5934BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5934BT3G, 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 SZ1SMB5934BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5934BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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