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onsemi SZ1SMA5935BT3G
- Part No.:
- SZ1SMA5935BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5935BT3G.pdf
- Description:
- DIODE ZENER 27V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
SZ1SMA5935BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal reverse breakdown voltage of 27 V, ±5% tolerance, 13.9 Ω dynamic impedance at 23 mA test current, and 0.25 μA leakage current at 20.6 V reverse voltage; used for precision voltage regulation and overvoltage protection in automotive power supplies and industrial DC rails.
For engineers reviewing the SZ1SMA5935BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage stability across temperature, low dynamic impedance for tight regulation, AEC-Q101 qualification for automotive use, and SMA package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener voltage (25.65–28.35 V) while maintaining stable clamping under regulated current (IZT = 23 mA). Its thermal resistance junction-to-lead is 50 °C/W, enabling 1.5 W dissipation at TL = 75°C with appropriate PCB copper area.
The SZ1SMA5935BT3G series features flat handling surfaces for accurate pick-and-place placement, Pb-free construction per RoHS, UL 94 V-0 flammability rating, and ESD robustness >16 kV HBM - all validated under AEC-Q101 stress testing for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.65–28.35 V range at IZT = 23 mA - ensures ±5% regulation accuracy in feedback loops |
| Power Dissipation (PD) | 1.5 W @ TL = 75°C - supports continuous operation in thermally constrained automotive modules |
| Zener Impedance (ZZT) | 13.9 Ω max @ IZT = 23 mA - minimizes output voltage variation under load transients |
| Leakage Current (IR) | 0.25 μA max @ VR = 20.6 V - prevents excessive standby current in battery-powered systems |
| Thermal Resistance (RJL) | 50 °C/W - requires ≥1 in² FR-4 copper pad for full 1.5 W rating at lead temperature ≤75°C |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in infotainment and body control units |
| AEC-Q101 Qualified | Yes - validated for automotive applications including engine control, lighting, and ADAS power domains |
Pinout & Package
SMA package (Case 403D), surface-mount, void-free molded plastic housing with cathode band marking; polarity defined by molded notch or band - compatible with standard SMT reflow profiles (260°C/10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band) | Reverse-bias anode connection | Connected to higher-potential rail for clamping; must be routed with low-inductance trace in surge protection |
| Anode | Reverse-bias cathode connection | Typically grounded or tied to reference node; defines direction of Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin environments - enables direct use in OEM BOMs without additional qualification |
| Low-profile SMA package | Replaces MELF diodes without footprint redesign - maintains same 2.5 mm height and 4.5 mm length constraints |
| 16 kV HBM ESD rating | Eliminates need for discrete TVS in many CAN/LIN bus interface protection circuits |
| Pb-free and RoHS compliant | Meets global automotive emissions standards and simplifies end-of-life recycling compliance |
| Flat handling surface | Enables high-yield, high-speed placement with standard vision-guided pick-and-place equipment |
Applications
| Automotive Power Rail Clamping | Industrial Sensor Reference |
|---|---|
Use Scenario: Protecting 24 V supply lines in body control modules against load dump transients up to 60 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp in parallel with downstream DC-DC converters. Use Value: Maintains <28.35 V clamping threshold with 13.9 Ω impedance, limiting peak energy dissipation during 100 ms transients. | Use Scenario: Providing stable 27 V reference for analog front-end amplifiers in factory automation pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric measurement circuits requiring <±0.5% long-term drift. Use Value: Delivers 27 V ±5% tolerance and 0.25 μA leakage at 20.6 V, minimizing offset error in 24-bit ADC bias networks. |
| LED Driver Overvoltage Protection | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Safeguarding constant-current LED drivers in commercial lighting against AC line surges coupled into low-voltage DC outputs. IC Role / Device Role / Timing Role: Fast-response shunt protector placed across driver output terminals to clamp transient spikes before LED string damage. Use Value: Responds within nanoseconds with 27 V threshold and 1.5 W surge capability - exceeds IEC 61000-4-5 Level 3 requirements. | Use Scenario: Protecting 24 V digital input channels in industrial PLCs from field-wiring induced transients and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on isolated input circuitry, working in concert with optocoupler and series resistor. Use Value: Provides 27 V clamping with <0.25 μA leakage, preserving input logic thresholds while surviving repeated 1 kV/500 A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5258T1G | 500 mW rating, 27 V nominal, SOD-123 package, RJA = 350 °C/W | Lower power handling limits use to low-current references (<10 mA); unsuitable for 1.5 W surge clamping | Select when board space is constrained and thermal budget allows derating below 500 mW |
| BZX84-C27LT1G | 350 mW rating, 27 V nominal, SOT-23 package, ZZT = 35 Ω @ 5 mA | Higher dynamic impedance degrades regulation under load; not AEC-Q101 qualified | Choose only for cost-sensitive consumer applications where automotive qualification is unnecessary |
Compared with MMSZ5258T1G and BZX84-C27LT1G, the SZ1SMA5935BT3G delivers 3× higher power handling, 2.5× lower Zener impedance, and automotive-grade reliability - making it the sole option for 24 V system clamping in AEC-Q101-compliant designs.
Availability
SZ1SMA5935BT3G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor signal conditioning, and LED driver protection requiring stable component supply across multi-year production cycles.
Supply support for SZ1SMA5935BT3G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable technology infrastructure.
The SZ1SMA59xxBT3G series was engineered specifically for automotive-grade voltage regulation and transient suppression, combining AEC-Q101 qualification, high-power SMT packaging, and tight Zener tolerance in a single platform.
FAQ
What is the maximum steady-state power dissipation for SZ1SMA5935BT3G at 75°C lead temperature?
The SZ1SMA5935BT3G has a maximum DC power dissipation of 1.5 W at TL = 75°C with zero lead length, derating linearly by 20 mW/°C above that temperature. This rating assumes a 1 in² copper pad on FR-4 board per onsemi's recommended layout - exceeding this thermal limit risks parametric shift or permanent failure.
Does SZ1SMA5935BT3G meet automotive reliability standards?
Yes, the SZ1SMA5935BT3G is AEC-Q101 qualified and PPAP capable, with validation across temperature cycling, humidity bias, mechanical shock, and ESD stress tests. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls and traceability - distinct from the commercial-grade 1SMA5935BT3G variant.
What is the Zener voltage tolerance and test condition for SZ1SMA5935BT3G?
The SZ1SMA5935BT3G has a ±5% Zener voltage tolerance, guaranteed at thermal equilibrium with IZT = 23 mA. The nominal voltage is 27 V, with minimum and maximum values of 25.65 V and 28.35 V respectively - measured after the device reaches stable junction temperature.
How does the dynamic impedance of SZ1SMA5935BT3G affect voltage regulation performance?
The SZ1SMA5935BT3G exhibits 13.9 Ω maximum dynamic impedance at IZT = 23 mA, meaning a 1 mA change in Zener current causes ≤13.9 mV output variation. This low ZZT ensures stable regulation under load transients - critical for protecting sensitive 24 V microcontrollers and analog sensors.
Can SZ1SMA5935BT3G replace MELF-style Zener diodes in existing designs?
Yes, the SZ1SMA5935BT3G is explicitly designed as an ideal replacement for MELF packages, offering identical electrical performance in a low-profile SMA surface-mount package. Its flat handling surface and standardized footprint enable drop-in substitution without PCB redesign - provided thermal copper area meets onsemi's 1 in² recommendation.
SZ1SMA5935BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZ1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 20.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5935BT3G FAQ
1.How can I place an order for SZ1SMA5935BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5935BT3G 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 SZ1SMA5935BT3G reliable?
The price and inventory of SZ1SMA5935BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5935BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5935BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5935BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5935BT3G?
SZ1SMA5935BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5935BT3G 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 SZ1SMA5935BT3G?
For technical support, including SZ1SMA5935BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5935BT3G requirements.
6.How does Aetrix verify that SZ1SMA5935BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5935BT3G 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 SZ1SMA5935BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5935BT3G?
All SZ1SMA5935BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5935BT3G, 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 SZ1SMA5935BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5935BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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