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onsemi SZ1SMB5935BT3G-VF01
- Part No.:
- SZ1SMB5935BT3G-VF01
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5935BT3G-VF01.pdf
- Description:
- DIODE ZENER 27V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:1,424
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Product details
Overview
SZ1SMB5935BT3G-VF01 from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 27 V (±5%), maximum zener impedance of 13.9 Ω at 23 mA test current, and reverse leakage current ≤0.25 μA at 20.6 V, designed for precision voltage regulation and overvoltage protection in automotive power rails and industrial DC-DC feedback loops.
For engineers reviewing the SZ1SMB5935BT3G-VF01 datasheet, pinout, applications, or equivalent options, key selection criteria include thermal derating above 75°C, AEC-Q101 qualification status, SMB package mechanical compatibility, and zener voltage temperature coefficient behavior above 12 V.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, delivering stable 27 V regulation under DC bias conditions where junction temperature remains within −65°C to +150°C. Its 3 W steady-state power dissipation at TL = 75°C and 550 mW at TA = 25°C enables use in compact PCB layouts with controlled thermal relief.
The SMB (Case 403A) package features modified L-bend leads for enhanced solder joint reliability, UL 94 V-0 flammability rating, and Pb-free construction compliant with RoHS. It supports top-side or bottom-side board mounting and exhibits ESD robustness >16 kV per Human Body Model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65–28.35 V (±5% tolerance at IZT = 23 mA; defines regulated output range) |
| Max Power Dissipation (PD) | 3.0 W at TL = 75°C; derates linearly to zero at 150°C (requires thermal pad design for sustained load) |
| Zener Impedance (ZZT) | 13.9 Ω max at IZT = 23 mA (low dynamic impedance ensures minimal output voltage variation under load transients) |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 20.6 V (enables low-quiescent-current standby operation) |
| Thermal Resistance (RJL) | 40 °C/W junction-to-lead (dictates minimum copper area needed under cathode pad for thermal management) |
| ESD Rating | Class 3 (>16 kV HBM) (supports handling in non-ESD-controlled assembly environments) |
| AEC-Q101 Qualified | Yes (validates suitability for automotive power supply monitoring and infotainment subsystems) |
Pinout & Package
SZ1SMB5935BT3G-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 indicated by a polarity band. Leads are modified L-bend for increased bond pad contact area and solder joint strength.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or return path; must be routed with low-inductance trace for stable regulation |
| Cathode | Regulated output node | Delivers stabilized 27 V; requires thermal relief pad tied to internal ground plane for power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 3 W Zener power rating | Enables single-device regulation in 24 V automotive auxiliary rails without external heat sinking |
| AEC-Q101 qualification | Validated for automotive-grade temperature cycling, humidity, and mechanical shock per PPAP requirements |
| Flat handling surface | Ensures consistent pick-and-place accuracy during high-speed SMT assembly |
| Pb-free and RoHS-compliant | Meets global environmental compliance mandates without requiring lead-free reflow profile changes |
| UL 94 V-0 flammability | Reduces fire propagation risk in enclosed industrial enclosures and EV battery management modules |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Monitoring 24 V battery rail voltage in engine control units to detect overvoltage faults before damaging microcontroller peripherals. IC Role / Device Role / Timing Role: Zener clamping element placed across microcontroller supply input to limit transient excursions above 27 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies during load dump events up to 35 V. |
Use Scenario: Protecting 0–10 V analog input channels in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp in front-end signal conditioning stage, paired with series resistor and TVS. Use Value: Limits input voltage to ≤27 V while maintaining <0.25 μA leakage to preserve measurement accuracy at full scale. |
| Telecom DC-DC Converter Feedback | Medical Equipment Power Sequencing |
Use Scenario: Providing precise 27 V reference for optocoupler-based feedback in isolated 48 V to 12 V telecom converters. IC Role / Device Role / Timing Role: Voltage reference in secondary-side error amplifier circuit to regulate output with ±1% stability. Use Value: Achieves <14 Ω dynamic impedance at 23 mA, minimizing feedback loop gain variation across temperature. |
Use Scenario: Enabling safe power-up sequencing in diagnostic imaging systems by clamping auxiliary 24 V rails until main supply stabilizes. IC Role / Device Role / Timing Role: Standby-mode voltage limiter that activates only during brown-out recovery phase. Use Value: Maintains ≤0.25 μA leakage at 20.6 V, avoiding unintended current draw in low-power sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5935BT3G | Same electrical specs and SMB package; lacks SZ-prefix AEC-Q101 qualification and automotive traceability controls | Approved for industrial/commercial use only; not validated for automotive temperature cycling or PPAP documentation | Select when automotive qualification is unnecessary and cost sensitivity outweighs long-term supply chain traceability |
| BZX84-C27LT1G | Lower 300 mW power rating, SOT-23 package, 27 V ±5%, 80 Ω ZZT at 5 mA | Suitable only for low-power signal-level clamping; cannot sustain 23 mA continuous current or handle 3 W surges | Choose only for space-constrained PCBs where power dissipation is <100 mW and thermal mass is limited |
Compared with 1SMB5935BT3G and BZX84-C27LT1G, SZ1SMB5935BT3G-VF01 uniquely combines automotive qualification, 3 W power handling, and low 13.9 Ω impedance - making it the only option among the three viable for sustained 23 mA regulation in engine bay environments.
Availability
SZ1SMB5935BT3G-VF01 is available at Aetrix Electronics and suitable for automotive ECU power monitoring, industrial PLC analog input protection, and telecom DC-DC converter feedback requiring stable component supply, AEC-Q101 compliance, and long-lifecycle availability.
Supply support for SZ1SMB5935BT3G-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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
SZ1SMB5935BT3G-VF01 belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G family of 3 W Zener regulators engineered specifically for automotive-grade voltage reference and overvoltage protection in harsh-environment power systems.
FAQ
What is the zener voltage tolerance for SZ1SMB5935BT3G-VF01?
The SZ1SMB5935BT3G-VF01 has a nominal zener voltage of 27 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 25.65 V and 28.35 V when measured at IZT = 23 mA and TL = 30°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
Is SZ1SMB5935BT3G-VF01 qualified for automotive applications?
Yes, SZ1SMB5935BT3G-VF01 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, distinguishing it from the commercial-grade 1SMB5935BT3G variant.
What is the maximum steady-state power dissipation for SZ1SMB5935BT3G-VF01 at ambient temperature?
SZ1SMB5935BT3G-VF01 delivers 550 mW maximum steady-state power dissipation at TA = 25°C, derating linearly at 4.4 mW/°C above that temperature. At TL = 75°C, its rated power increases to 3.0 W, reflecting superior thermal performance when mounted on a thermally optimized PCB land pattern.
Does SZ1SMB5935BT3G-VF01 have a specified reverse leakage current?
Yes, SZ1SMB5935BT3G-VF01 specifies a maximum reverse leakage current (IR) of 0.25 μA at VR = 20.6 V, as shown in the Electrical Characteristics table. This ultra-low leakage supports precision voltage reference applications where standby current must remain below 1 μA.
What package type does SZ1SMB5935BT3G-VF01 use, and what are its key mechanical features?
SZ1SMB5935BT3G-VF01 uses the SMB (Case 403A) surface-mount plastic package with dimensions of 4.06–4.60 mm (E) × 3.30–3.95 mm (D) × 2.159–2.47 mm (A). Key mechanical features include a flat handling surface for accurate placement, modified L-bend leads for increased solder joint area, and a cathode polarity band for unambiguous orientation.
SZ1SMB5935BT3G-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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 20.6 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
SZ1SMB5935BT3G-VF01 FAQ
1.How can I place an order for SZ1SMB5935BT3G-VF01 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5935BT3G-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 SZ1SMB5935BT3G-VF01 reliable?
The price and inventory of SZ1SMB5935BT3G-VF01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5935BT3G-VF01 is usually 5 days.
3.What payment methods are accepted for SZ1SMB5935BT3G-VF01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5935BT3G-VF01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5935BT3G-VF01?
SZ1SMB5935BT3G-VF01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5935BT3G-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 SZ1SMB5935BT3G-VF01?
For technical support, including SZ1SMB5935BT3G-VF01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5935BT3G-VF01 requirements.
6.How does Aetrix verify that SZ1SMB5935BT3G-VF01 is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5935BT3G-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 SZ1SMB5935BT3G-VF01 meets industry standards.
7.What is the process for return or replacement of SZ1SMB5935BT3G-VF01?
All SZ1SMB5935BT3G-VF01 units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5935BT3G-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 SZ1SMB5935BT3G-VF01 part is unused and in its original packaging.
Return procedure for SZ1SMB5935BT3G-VF01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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