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onsemi SZ1SMB5938BT3G-VF01
- Part No.:
- SZ1SMB5938BT3G-VF01
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5938BT3G-VF01.pdf
- Description:
- DIODE ZENER 36V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SZ1SMB5938BT3G-VF01 from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 36 V (±5%), dynamic impedance of 10.4 Ω at 38 mA test current, and maximum reverse leakage current of 0.25 μA at 27.4 V, designed for precision voltage regulation in automotive power supply rails and ESD-protected sensor interfaces.
For engineers reviewing the SZ1SMB5938BT3G-VF01 datasheet, pinout, applications, or equivalent options, key selection criteria include zener tolerance (±5%), thermal resistance (226 °C/W), AEC-Q101 qualification, SMB package footprint compatibility, and 16 kV HBM ESD rating.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon, with zener voltage specified at IZT = 38 mA and thermal equilibrium at TL = 30°C. Its 3 W steady-state power dissipation is rated at TL = 75°C, derating linearly above that temperature at 25 mW/°C.
The SMB (Case 403A) package features modified L-bend leads for enhanced pad contact area, UL 94 V-0 flammability rating, and polarity indicated by cathode band. It supports top-side or bottom-side PCB mounting and meets AEC-Q101 stress testing requirements for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36 V nominal (34.2–37.8 V range); defines stable regulation point under 38 mA DC bias. |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C; requires heatsinking or board copper area to maintain junction temperature ≤150°C. |
| Zener Impedance (ZZT) | 10.4 Ω @ IZT = 38 mA; determines output voltage variation under load transients. |
| Reverse Leakage (IR) | 0.25 μA @ VR = 27.4 V; ensures minimal quiescent current in standby mode. |
| Thermal Resistance (RJA) | 226 °C/W @ TA = 25°C on FR-4; dictates minimum PCB copper area needed for thermal management. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; enables direct placement in ESD-sensitive signal paths without external protection. |
| Operating Temperature | −65°C to +150°C; supports under-hood automotive environments and industrial control enclosures. |
Pinout & Package
SZ1SMB5938BT3G-VF01 uses the SMB (Case 403A) surface-mount plastic package: 4.06–4.60 mm width (E), 3.30–3.95 mm length (D), 2.159–2.47 mm height (A), with cathode polarity marked by a visible band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to system ground or lower-potential rail; must sink full zener current during regulation. |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 36 V reference when reverse-biased; polarity band identifies this terminal on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power modules, engine control units, and ADAS sensor supplies requiring zero-defect reliability. |
| 16 kV HBM ESD rating | Eliminates need for discrete TVS diodes in CAN/LIN bus interface protection and low-speed sensor lines. |
| Flat handling surface | Enables high-accuracy pick-and-place placement on automated SMT lines with <±0.1 mm positional tolerance. |
| Pb-free (RoHS-compliant) | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL-1); no baking required before reflow soldering. |
| Top/bottom mount flexibility | Allows dual-sided PCB assembly and space-constrained layouts where component height is limited to 2.47 mm max. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 36 V reference for analog-to-digital conversion of throttle position and oxygen sensor signals. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing stable bias for op-amp input stages and ADC reference buffers. Use Value: Maintains ±0.5% measurement accuracy across −40°C to +125°C ambient due to tight 36 V ±5% tolerance and low tempco. |
Use Scenario: Clamping and regulating 36 V auxiliary rail powering 4–20 mA transmitter circuits in hazardous-area transmitters. IC Role / Device Role / Timing Role: Overvoltage protection and precision voltage clamp for loop-powered analog front-ends. Use Value: Limits transient-induced errors to <1 LSB in 16-bit DACs via 10.4 Ω dynamic impedance and 0.25 μA leakage at 27.4 V. |
| Automotive Infotainment Power Sequencing | Medical Diagnostic Equipment Power Rails |
Use Scenario: Providing clean 36 V bias for display backlight LED drivers and audio amplifier bias networks. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing switching regulator feedback nodes during cold-crank conditions. Use Value: Ensures uninterrupted operation during 4.5–16 V battery dips by maintaining regulation down to 27.4 V reverse voltage threshold. |
Use Scenario: Generating stable 36 V reference for high-voltage isolation amplifiers in patient-connected ECG and EEG front-ends. IC Role / Device Role / Timing Role: Safety-critical voltage clamp preventing overvoltage damage to isolated data acquisition ICs. Use Value: Meets IEC 60601-1 creepage/clearance requirements via UL 94 V-0 package and 150°C max junction temperature rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5938BT3G | Same electrical specs and SMB package; lacks SZ-prefix AEC-Q101 qualification and PPAP capability. | Approved for commercial/industrial use only; not validated for automotive temperature cycling or humidity testing. | Select when cost sensitivity outweighs automotive qualification requirements and end-equipment does not require PPAP documentation. |
| BZX84-C36LT1G | Lower power (350 mW), SOT-23 package, 36 V ±5%, higher ZZT = 90 Ω @ 5 mA. | Targeted at low-current logic-level clamping; unsuitable for >10 mA regulation loads or thermal cycling above 85°C. | Choose only for space-constrained, low-power applications where 3 W dissipation and 150°C operation are unnecessary. |
Compared with SZ1SMB5938BT3G-VF01, 1SMB5938BT3G offers identical performance but no automotive qualification, while BZX84-C36LT1G trades power handling and thermal robustness for smaller size and lower cost-making SZ1SMB5938BT3G-VF01 the sole choice for AEC-Q101-compliant 36 V regulation at ≥38 mA.
Availability
SZ1SMB5938BT3G-VF01 is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5938BT3G-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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1SMB5938BT3G-VF01 belongs to the SZ1SMB59xxT3G series-engineered specifically for AEC-Q101-compliant voltage regulation in harsh-environment automotive systems where reliability, ESD immunity, and thermal stability are critical.
FAQ
What is the zener voltage tolerance of SZ1SMB5938BT3G-VF01?
The SZ1SMB5938BT3G-VF01 has a zener voltage tolerance of ±5%, meaning its actual reverse breakdown voltage falls within 34.2 V to 37.8 V at IZT = 38 mA and TL = 30°C. 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 SZ1SMB5938BT3G-VF01 qualified for automotive applications?
Yes, SZ1SMB5938BT3G-VF01 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, including extended temperature operation, humidity testing, and mechanical shock validation.
What is the maximum power dissipation of SZ1SMB5938BT3G-VF01 at 100°C lead temperature?
At 100°C lead temperature, SZ1SMB5938BT3G-VF01's maximum power dissipation is 2.375 W. This is calculated using the derating factor of 25 mW/°C above 75°C: 3.0 W − (100 − 75) × 0.025 W = 2.375 W. This value assumes zero lead length and proper PCB copper thermal relief per the recommended footprint.
Does SZ1SMB5938BT3G-VF01 have a Pb-free construction?
Yes, SZ1SMB5938BT3G-VF01 is Pb-free and RoHS-compliant, as indicated by the "G" suffix in its part number and confirmed in the Mechanical Characteristics section. It meets IPC-J-STD-020 MSL-1 requirements, eliminating the need for pre-reflow baking and supporting standard lead-free reflow profiles.
What is the reverse leakage current specification for SZ1SMB5938BT3G-VF01?
The reverse leakage current for SZ1SMB5938BT3G-VF01 is 0.25 μA maximum at VR = 27.4 V, as specified in the Electrical Characteristics table. This low leakage ensures minimal power loss in always-on automotive subsystems and preserves battery life in portable diagnostic instruments.
SZ1SMB5938BT3G-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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 38 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 27.4 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
SZ1SMB5938BT3G-VF01 FAQ
1.How can I place an order for SZ1SMB5938BT3G-VF01 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5938BT3G-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 SZ1SMB5938BT3G-VF01 reliable?
The price and inventory of SZ1SMB5938BT3G-VF01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5938BT3G-VF01 is usually 5 days.
3.What payment methods are accepted for SZ1SMB5938BT3G-VF01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5938BT3G-VF01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5938BT3G-VF01?
SZ1SMB5938BT3G-VF01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5938BT3G-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 SZ1SMB5938BT3G-VF01?
For technical support, including SZ1SMB5938BT3G-VF01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5938BT3G-VF01 requirements.
6.How does Aetrix verify that SZ1SMB5938BT3G-VF01 is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5938BT3G-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 SZ1SMB5938BT3G-VF01 meets industry standards.
7.What is the process for return or replacement of SZ1SMB5938BT3G-VF01?
All SZ1SMB5938BT3G-VF01 units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5938BT3G-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 SZ1SMB5938BT3G-VF01 part is unused and in its original packaging.
Return procedure for SZ1SMB5938BT3G-VF01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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