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onsemi S1Z1SMB5919BT3G
- Part No.:
- S1Z1SMB5919BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
S1Z1SMB5919BT3G.pdf
- Description:
- DIODE ZENER 5.6V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,665
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Product details
Overview
S1Z1SMB5919BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 5.6 V, maximum Zener impedance of 66.9 Ω at 2 mA test current, and reverse leakage current ≤5 μA at 3 V, designed for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the S1Z1SMB5919BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% voltage tolerance, 226°C/W junction-to-ambient thermal resistance, AEC−Q101 qualification (SZ variant), and SMB package compatibility with automated PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode polarity indicated by a band, requiring no external bias circuitry. Its Zener breakdown mechanism delivers stable regulation across −65°C to +150°C operating temperature range and supports DC steady-state power dissipation up to 550 mW at 25°C ambient.
The SMB package enables top-side or bottom-side board mounting, features modified L-bend leads for enhanced solder joint reliability, and meets UL 94 V−0 flammability rating. Thermal derating begins above 25°C at 4.4 mW/°C, with junction-to-lead resistance fixed at 40°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.32–5.88 V (±5% tolerance at IZT = 2 mA; ensures predictable clamping level in regulation circuits) |
| Max Zener Impedance | 66.9 Ω at IZT = 2 mA (low dynamic impedance maintains regulation accuracy under load transients) |
| Reverse Leakage Current | ≤5 μA at VR = 3 V (minimizes standby power loss in low-current bias networks) |
| Power Dissipation (PD) | 550 mW at TA = 25°C (supports compact power rail stabilization without forced cooling) |
| Junction-to-Ambient RJA | 226°C/W (defines thermal rise per watt; requires adequate copper area for sustained 550 mW operation) |
| ESD Rating | Class 3 (>16 kV HBM) (enables robust handling in automated manufacturing without special ESD controls) |
| Operating Temperature | −65°C to +150°C (validates use in automotive engine compartments and industrial control enclosures) |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H); Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground for feedback divider |
| Cathode | Zener breakdown terminal / voltage clamp output | Connected to higher-potential rail; provides stable 5.6 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Flat handling surface | Enables precise pick-and-place placement during SMT assembly, reducing tombstoning risk |
| Modified L-bend leads | Increases solder contact area on PCB pads, improving mechanical strength and thermal transfer |
| AEC−Q101 qualified (SZ variant) | Validated for automotive applications including body electronics and infotainment power rails |
| UL 94 V−0 flammability rating | Meets safety requirements for enclosed industrial equipment and consumer power adapters |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile standards |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference diode providing precise 5.6 V threshold to TL431 shunt regulator input. Use Value: Maintains ±1% output regulation across line/load variations due to tight 5.6 V tolerance and low 66.9 Ω impedance. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on sensor interface lines. IC Role / Device Role / Timing Role: Clamping diode shunting excess energy to ground when input exceeds 5.88 V. Use Value: Limits pin stress to safe levels with <5 μA leakage at 3 V, preserving signal integrity during normal operation. |
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|
Use Scenario: Providing stable reference for LIN bus transceiver biasing in door module ECUs. IC Role / Device Role / Timing Role: Voltage reference element ensuring consistent transceiver threshold across −40°C to +125°C ambient. Use Value: Enables AEC−Q101 compliance with guaranteed operation down to −65°C and up to +150°C junction temperature. |
Use Scenario: Biasing bridge amplifier inputs in pressure transducer front-end circuits. IC Role / Device Role / Timing Role: Low-noise Zener source establishing common-mode voltage for instrumentation amplifiers. Use Value: Delivers stable 5.6 V reference with <1 mV/°C tempco below 6 V, minimizing offset drift in analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5919BT3G | Same electrical specs and SMB package; differs only in marking code (919B vs. 1SMB prefix); identical thermal and reliability performance. | No functional difference; used interchangeably in non-automotive designs where AEC−Q101 is not required. | Select S1Z1SMB5919BT3G when full traceability to onsemi's SZ-series automotive-grade production line is mandated. |
| BZX84-C5V6LT1G | Lower power rating (300 mW), SOT-23 package, higher ZZT (90 Ω), wider tolerance (±5% but looser distribution). | Suitable for low-power logic-level clamping but cannot sustain 550 mW continuous dissipation or match SMB thermal performance. | Choose BZX84-C5V6LT1G only for space-constrained PCBs where 3 W capability is unnecessary and cost is primary driver. |
Compared with 1SMB5919BT3G, S1Z1SMB5919BT3G offers identical regulation performance with full automotive traceability; versus BZX84-C5V6LT1G, it delivers 83% higher power handling and 26% lower dynamic impedance-critical for high-reliability power rail stabilization.
Availability
S1Z1SMB5919BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, switch-mode power supply feedback networks, and overvoltage protection circuits requiring stable component supply and AEC−Q101 compliance.
Supply support for S1Z1SMB5919BT3G 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMB59xxBT3G/SZ1SMB59xxT3G series was engineered specifically for high-reliability voltage regulation in harsh-environment electronics, emphasizing thermal robustness, ESD resilience, and automotive-grade process control.
FAQ
What is the Zener voltage tolerance for S1Z1SMB5919BT3G?
The S1Z1SMB5919BT3G has a nominal Zener voltage of 5.6 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 5.32 V and 5.88 V when tested at IZT = 2 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.
Is S1Z1SMB5919BT3G AEC−Q101 qualified?
S1Z1SMB5919BT3G is not AEC−Q101 qualified; only the SZ-prefix variants (e.g., SZ1SMB5919BT3G) carry that qualification. The "S1Z1" prefix indicates a commercial-grade version sharing identical electrical and mechanical specifications but produced on a non-automotive wafer fab line. For automotive applications, SZ1SMB5919BT3G must be specified.
What is the maximum continuous power dissipation for S1Z1SMB5919BT3G at 75°C ambient?
At TL = 75°C (lead temperature), the S1Z1SMB5919BT3G supports 3.0 W steady-state power dissipation. However, at TA = 75°C (ambient temperature), derating applies: starting from 550 mW at 25°C, it loses 4.4 mW per °C, resulting in 330 mW maximum at 75°C ambient. This value assumes FR-4 board with recommended footprint per datasheet footnote 1.
Does S1Z1SMB5919BT3G have a specified temperature coefficient?
Yes-the S1Z1SMB5919BT3G exhibits a typical temperature coefficient (θVZ) of approximately −2 mV/°C for Zener voltages below 6 V, as shown in Figure 3 of the datasheet. This negative coefficient means its breakdown voltage decreases slightly with rising temperature, a characteristic inherent to low-voltage Zener diodes and accounted for in precision reference designs.
What is the forward voltage drop specification for S1Z1SMB5919BT3G?
The S1Z1SMB5919BT3G has a maximum forward voltage (VF) of 1.5 V at IF = 200 mA dc, as stated in the Electrical Characteristics summary on page 2. This parameter is relevant when the device is operated in forward conduction mode-for example, as a polarity protection diode-and confirms compatibility with standard silicon diode drive requirements.
S1Z1SMB5919BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.6 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 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
S1Z1SMB5919BT3G FAQ
1.How can I place an order for S1Z1SMB5919BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for S1Z1SMB5919BT3G 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 S1Z1SMB5919BT3G reliable?
The price and inventory of S1Z1SMB5919BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1Z1SMB5919BT3G is usually 5 days.
3.What payment methods are accepted for S1Z1SMB5919BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1Z1SMB5919BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1Z1SMB5919BT3G?
S1Z1SMB5919BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1Z1SMB5919BT3G 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 S1Z1SMB5919BT3G?
For technical support, including S1Z1SMB5919BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1Z1SMB5919BT3G requirements.
6.How does Aetrix verify that S1Z1SMB5919BT3G is sourced from the original manufacturer or authorized distributors?
All S1Z1SMB5919BT3G 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 S1Z1SMB5919BT3G meets industry standards.
7.What is the process for return or replacement of S1Z1SMB5919BT3G?
All S1Z1SMB5919BT3G units undergo pre-shipment inspection (PSI). If there is an issue with S1Z1SMB5919BT3G, 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 S1Z1SMB5919BT3G part is unused and in its original packaging.
Return procedure for S1Z1SMB5919BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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