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onsemi SZ1SMB5919BT3G
- Part No.:
- SZ1SMB5919BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5919BT3G.pdf
- Description:
- DIODE ZENER 5.6V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:10,433
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Product details
Overview
SZ1SMB5919BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 5.6 V, ±5% tolerance, 66.9 Ω dynamic impedance at 2 mA test current, and 3 A maximum DC Zener current - used for precision voltage regulation and overvoltage protection in automotive power rails and industrial sensor interfaces.
For engineers reviewing the SZ1SMB5919BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include thermal derating above 75°C, cathode-band polarity identification, SMB package footprint compatibility, and AEC−Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its specified VZ. It exhibits a positive temperature coefficient above ~5 V (≈2 mV/°C for 5.6 V), enabling stable regulation under varying ambient conditions.
Designed for DC power supply stabilization and transient suppression, it supports steady-state dissipation up to 3.0 W at TL = 75°C with 40 °C/W junction-to-lead thermal resistance, and delivers 267 mA maximum Zener current at 5.6 V nominal output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.32–5.88 V @ IZT = 2 mA - defines regulated output range under standard test conditions |
| Zener Impedance (ZZT) | 66.9 Ω @ IZT = 2 mA - determines voltage deviation under load current changes |
| Max DC Zener Current (IZM) | 267 mA - sets upper limit for continuous regulation without thermal runaway |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C - usable power budget when mounted on thermally optimized PCB pad |
| Thermal Resistance (RJL) | 40 °C/W - enables thermal design using lead temperature as proxy for junction temperature |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness during automated handling and board assembly |
| AEC−Q101 Qualified | Yes - validated for automotive applications including engine control and body electronics |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with modified L-bend leads, cathode indicated by polarity band, UL 94 V−0 flammability rating, and Pb−free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail in shunt regulator configuration |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to input rail; clamps voltage to VZ when reverse biased beyond breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Zener voltage tolerance | ±5% - ensures predictable regulation window across production lots |
| Flat handling surface | Enables accurate pick-and-place placement during SMT assembly |
| Top/bottom board mounting support | Allows flexible layout integration in space-constrained modules |
| Polarity band marking | Unambiguous cathode identification for correct orientation in high-reliability circuits |
| Modified L-bend leads | Increases solder joint area and mechanical strength on PCB pads |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V reference for microcontroller ADC and CAN transceiver biasing in under-hood ECU modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 5.6 V clamp against battery transients and alternator ripple. Use Value: Maintains <50 mV regulation error across −40°C to +125°C ambient, supporting AEC−Q101 compliance. |
Use Scenario: Protecting 4–20 mA loop transmitter inputs from ESD and surge events in factory automation systems. IC Role / Device Role / Timing Role: Overvoltage clamp placed before op-amp input stage to limit fault energy. Use Value: Withstands >16 kV HBM ESD and absorbs 3 W transient power without degradation. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Secondary-side voltage reference in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Precision Zener setting TL431 feedback threshold via resistive divider. Use Value: 66.9 Ω ZZT minimizes output voltage drift under load step changes. |
Use Scenario: Providing stable bias for photodiode amplifiers in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing analog signal chain operating at <10 µA quiescent current. Use Value: 5 µA leakage at 4.5 V ensures minimal current injection into high-impedance sensor nodes. |
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-C5V6LT1G | 250 mW SOT-23 package, 5.6 V ±5%, ZZT = 40 Ω @ 5 mA | Lower power rating limits use to <100 mA loads; unsuitable for automotive under-hood thermal environments | Select when board space is critical and power demand is ≤250 mW |
| 1N5338B | 5 W DO-15 through-hole, 5.6 V ±5%, ZZT = 1.5 Ω @ 1.2 A | Higher power and lower impedance but requires manual or wave soldering; no AEC−Q101 qualification | Select for high-current linear regulators where thermal mass and legacy footprint are acceptable |
Compared with BZX84-C5V6LT1G and 1N5338B, SZ1SMB5919BT3G uniquely balances 3 W surface-mount capability, AEC−Q101 qualification, and SMB footprint compatibility - making it optimal for automotive and industrial SMT designs requiring regulated 5.6 V references with thermal and reliability assurance.
Availability
SZ1SMB5919BT3G is available at Aetrix Electronics and suitable for automotive ECU power management, industrial sensor interface protection, and medical diagnostic equipment bias supply requiring stable component supply and full traceability.
Supply support for SZ1SMB5919BT3G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1SMB5919BT3G belongs to the 1SMB59xxBT3G/SZ1SMB59xxT3G series - engineered for high-reliability voltage regulation in harsh environments, with emphasis on automotive-grade robustness and surface-mount manufacturability.
FAQ
What is the Zener voltage tolerance of SZ1SMB5919BT3G?
The SZ1SMB5919BT3G has a Zener voltage tolerance of ±5%, with a nominal value of 5.6 V and guaranteed range of 5.32 V to 5.88 V at IZT = 2 mA. This tolerance is explicitly defined in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies to all devices in the SZ1SMB59xxBT3G series.
Is SZ1SMB5919BT3G qualified for automotive applications?
Yes, SZ1SMB5919BT3G is AEC−Q101 qualified and PPAP capable, as confirmed in the Features section of the datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, and the device meets stress testing standards for temperature cycling, humidity, and mechanical shock required in automotive electronics.
What is the maximum steady-state power dissipation for SZ1SMB5919BT3G?
SZ1SMB5919BT3G has a maximum steady-state power dissipation of 3.0 W at lead temperature (TL) = 75°C, with a derating factor of 25 mW/°C above that temperature. At ambient temperature (TA) = 25°C, the rated power drops to 550 mW due to higher thermal resistance to ambient (226 °C/W).
How is polarity identified on the SZ1SMB5919BT3G package?
Polarity on SZ1SMB5919BT3G is indicated by a cathode band marked on the SMB package body. Per the Mechanical Characteristics section, this band identifies the cathode terminal, while the opposite end is the anode. The marking diagram on page 1 confirms the band location adjacent to the cathode lead.
What is the Zener impedance of SZ1SMB5919BT3G and why does it matter?
SZ1SMB5919BT3G has a maximum Zener impedance (ZZT) of 66.9 Ω at IZT = 2 mA. This parameter quantifies how much the output voltage varies with changes in Zener current - lower ZZT means tighter regulation. For example, a 10 mA load shift causes only ~0.67 V deviation, critical for stable reference performance in precision analog circuits.
SZ1SMB5919BT3G 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
SZ1SMB5919BT3G FAQ
1.How can I place an order for SZ1SMB5919BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5919BT3G 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 SZ1SMB5919BT3G reliable?
The price and inventory of SZ1SMB5919BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5919BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5919BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5919BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5919BT3G?
SZ1SMB5919BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5919BT3G 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 SZ1SMB5919BT3G?
For technical support, including SZ1SMB5919BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5919BT3G requirements.
6.How does Aetrix verify that SZ1SMB5919BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5919BT3G 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 SZ1SMB5919BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5919BT3G?
All SZ1SMB5919BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5919BT3G, 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 SZ1SMB5919BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5919BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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