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onsemi SZ1SMB5916BT3G
- Part No.:
- SZ1SMB5916BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5916BT3G.pdf
- Description:
- DIODE ZENER 4.3V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,232
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Product details
Overview
SZ1SMB5916BT3G from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 4.3 V, ±5% tolerance, 87.2 Ω dynamic impedance at 6 mA test current, and 5 μA reverse leakage at 3.4 V, used for precision voltage regulation in automotive power supply rails and low-voltage reference circuits.
For engineers reviewing the SZ1SMB5916BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability over temperature, surge power capability (up to 100 W non-repetitive), AEC-Q101 qualification, and SMB package thermal performance under PCB-constrained conditions.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable reverse breakdown across ambient temperatures from −65 °C to +150 °C, with thermal resistance from junction-to-lead of 40 °C/W and junction-to-ambient of 226 °C/W on FR-4 board.
It delivers regulated output using controlled avalanche breakdown, exhibits ESD robustness >16 kV HBM, and supports both top-side and bottom-side PCB mounting due to its symmetric SMB case geometry and flat handling surface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal (min 4.08 V, max 4.52 V) - defines precise clamping threshold for 5 V rail protection and reference generation |
| Zener Test Current (IZT) | 6 mA - standard bias point for measuring VZ and dynamic impedance; ensures stable regulation in low-power sensing circuits |
| Zener Impedance (ZZT) | 87.2 Ω at IZT - indicates voltage regulation sensitivity; lower values improve load regulation in feedback loops |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - maximum steady-state power at lead temperature; derates linearly above 75 °C (25 mW/°C) |
| Reverse Leakage (IR) | 5 μA @ VR = 3.4 V - confirms low standby current in battery-powered systems where quiescent power matters |
| Surge Power (PPK) | 100 W (non-repetitive, 10 ms pulse) - enables transient overvoltage suppression in automotive load-dump scenarios |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against handling and system-level electrostatic discharge events |
Pinout & Package
The SZ1SMB5916BT3G uses the SMB (Case 403A) plastic surface-mount 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 polarity band. Leads are modified L-bend for enhanced pad contact area and solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or ground; establishes reference potential for zener operation in reverse bias |
| Cathode | Reverse breakdown terminal / Regulated output node | Connected to input rail; maintains stable voltage drop across anode when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring high reliability |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles up to 260 °C for 10 s |
| Flat handling surface | Enables accurate automated pick-and-place placement with <±0.1 mm positional tolerance on SMT lines |
| Top/bottom mounting support | Package symmetry allows routing flexibility-no keep-out restrictions on adjacent layer copper beneath device |
| UL 94 V-0 flammability rating | Meets safety requirements for enclosed industrial and automotive enclosures without additional flame-retardant coating |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamping | Industrial Sensor Signal Conditioning Reference |
|---|---|
Use Scenario: Protects 5 V microcontroller supply rail from load-dump transients and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response voltage clamping during 100 W surge events. Use Value: Maintains VCC within ±0.2 V of 4.3 V during 10 ms pulses, preventing MCU brownout or reset during cranking. |
Use Scenario: Supplies stable reference voltage to 12-bit ADC inputs in factory-floor pressure and temperature sensors. IC Role / Device Role / Timing Role: Precision DC voltage source replacing higher-cost bandgap references where ±5% accuracy suffices. Use Value: Delivers 4.3 V reference with <5 μA leakage, enabling <100 nA total sensor bias current in ultra-low-power wireless nodes. |
| Consumer USB-C Power Delivery Adapter Feedback | Medical Patient Monitor Battery Backup Regulator |
Use Scenario: Sets feedback threshold for secondary-side synchronous rectifier controllers in compact 20 W USB-C chargers. IC Role / Device Role / Timing Role: Zener-based voltage divider element defining output voltage setpoint in isolated flyback topology. Use Value: Enables ±2% output regulation with minimal BOM count-no external op-amp or reference IC required. |
Use Scenario: Regulates backup voltage for real-time clock (RTC) and SRAM retention during main power loss in portable monitors. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator sustaining 3.3 V logic supply from 3.7 V Li-ion cell during deep discharge. Use Value: Draws only 5 μA at 3.4 V reverse bias, extending RTC runtime beyond 72 hours on single-cell charge. |
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-C4V3LT1G | 250 mW SOT-23 device; 4.3 V nominal, 90 Ω ZZT @ 5 mA; no AEC-Q101 qualification | Not suitable for automotive or high-surge environments; limited to space-constrained consumer PCBs | Select when board area is critical and surge immunity <10 W is acceptable |
| 1N4733A | 1 W DO-41 through-hole part; 5.1 V nominal, 7 Ω ZZT @ 49 mA; no Pb-free or AEC-Q101 compliance | Requires manual assembly or wave soldering; incompatible with automated SMT lines | Select only for legacy repair or prototyping where footprint compatibility with existing DO-41 pads is mandatory |
Compared with BZX84-C4V3LT1G and 1N4733A, the SZ1SMB5916BT3G uniquely combines 3 W power handling, AEC-Q101 qualification, and SMB surface-mount compatibility-making it the only option for production automotive modules requiring validated reliability and SMT scalability.
Availability
SZ1SMB5916BT3G is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor signal chains, USB-C power adapter feedback networks, and medical battery backup circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5916BT3G 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, with manufacturing sites across Asia, North America, and Europe.
The SZ1SMB59xxT3G series was developed specifically for AEC-Q101-compliant automotive power management and industrial voltage reference applications where high surge resilience, tight zener tolerance, and Pb-free SMT packaging are mandatory.
FAQ
What is the zener voltage tolerance for SZ1SMB5916BT3G?
The SZ1SMB5916BT3G has a nominal zener voltage of 4.3 V with a tolerance of ±5%, meaning the actual measured VZ falls between 4.08 V and 4.52 V at IZT = 6 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies to all devices in the SZ1SMB59xxT3G series.
Is SZ1SMB5916BT3G qualified for automotive use?
Yes, SZ1SMB5916BT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade variants meeting stress testing requirements for temperature cycling, humidity bias, and mechanical shock-making SZ1SMB5916BT3G suitable for under-hood and cabin ECU applications.
What is the maximum surge power rating for SZ1SMB5916BT3G?
The SZ1SMB5916BT3G supports a non-repetitive peak surge power of 100 W for pulse widths up to 10 ms, as shown in Figure 2 of the onsemi datasheet. This rating assumes TJ = 25 °C prior to the pulse and applies to rectangular waveforms-critical for protecting downstream circuitry during automotive load-dump events.
Does SZ1SMB5916BT3G have Pb-free construction?
Yes, SZ1SMB5916BT3G is Pb-free and RoHS-compliant, as indicated by the "G" suffix and confirmed in the Mechanical Characteristics section. It meets JEDEC J-STD-020 reflow standards with a maximum lead temperature of 260 °C for 10 seconds, supporting standard lead-free SMT assembly processes without reliability degradation.
What is the reverse leakage current specification for SZ1SMB5916BT3G?
The reverse leakage current for SZ1SMB5916BT3G is specified as 5 μA maximum at VR = 3.4 V (80% of nominal VZ), per the Electrical Characteristics table on page 3. This low leakage enables efficient operation in battery-backed systems and low-power sensor interfaces where standby current must remain below 10 μA.
SZ1SMB5916BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- -
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 6 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 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
SZ1SMB5916BT3G FAQ
1.How can I place an order for SZ1SMB5916BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5916BT3G 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 SZ1SMB5916BT3G reliable?
The price and inventory of SZ1SMB5916BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5916BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5916BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5916BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5916BT3G?
SZ1SMB5916BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5916BT3G 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 SZ1SMB5916BT3G?
For technical support, including SZ1SMB5916BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5916BT3G requirements.
6.How does Aetrix verify that SZ1SMB5916BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5916BT3G 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 SZ1SMB5916BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5916BT3G?
All SZ1SMB5916BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5916BT3G, 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 SZ1SMB5916BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5916BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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