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onsemi SZ1SMA5919BT3G
- Part No.:
- SZ1SMA5919BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5919BT3G.pdf
- Description:
- DIODE ZENER 5.6V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,200
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Product details
Overview
SZ1SMA5919BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 5.6 V, maximum zener impedance of 66.9 Ω at 2.0 mA test current, and reverse leakage current ≤2.5 μA at 4.2 V. It operates from −65 °C to +150 °C and is AEC−Q101 qualified for automotive power rail regulation and ESD-protected voltage clamping.
For engineers reviewing the SZ1SMA5919BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal resistance (250 °C/W at TA = 25 °C), low-profile SMA package compatibility, and Class 3 ESD rating (>16 kV HBM).
Technical Context
This device functions as a precision voltage reference and overvoltage clamp in DC bias networks. Its 5.6 V nominal breakdown is specified at IZT = 2.0 mA with tight ±5% tolerance, and it maintains stable regulation across −65 °C to +150 °C operating range.
The SMA package enables top-slide or bottom-board mounting with flat handling surface and Pb-free construction. Thermal derating begins at 25 °C (4.0 mW/°C) and junction-to-ambient thermal resistance is 250 °C/W under standard FR-4 board conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 5.6 V - precise DC reference point for 5 V rail stabilization |
| Zener Voltage Tolerance | ±5% - ensures predictable clamping within 5.32–5.88 V at IZT |
| Zener Impedance | 66.9 Ω max @ 2.0 mA - low dynamic resistance for stable regulation under load variation |
| Power Dissipation (TA=25°C) | 0.5 W - usable in compact PCB layouts without forced cooling |
| Reverse Leakage Current | ≤2.5 μA @ 4.2 V - minimal standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - robust protection against handling and system-level ESD events |
| Operating Temperature | −65 °C to +150 °C - validated for under-hood automotive and industrial environments |
Pinout & Package
Package: SMA (Case 403D), surface-mount, low-profile plastic package with cathode indicated by molded band. Compatible with standard reflow profiles (260 °C for 10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | Zener anode connection in reverse-bias configuration | Connected to higher-potential node for voltage clamping or reference generation |
| Anode (Opposite End) | Zener cathode connection in reverse-bias configuration | Connected to lower-potential node (e.g., ground or return path) to complete bias circuit |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated reliability for automotive power supply monitoring and ECU voltage supervision |
| Flat handling surface | Enables accurate pick-and-place placement and consistent solder joint formation |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow standards |
| UL 94 V−0 flammability rating | Self-extinguishing housing meets safety requirements for enclosed industrial modules |
| Top-slide or bottom-mount capability | Flexible layout integration in space-constrained PCBs with dual-side assembly options |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Clamping transient spikes on 5 V microcontroller supply rails in engine control units. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursions above 5.88 V. Use Value: Prevents MCU latch-up or damage during load-dump events while maintaining <2.5 μA leakage at nominal 5 V operation. | Use Scenario: Providing stable 5.6 V reference for analog front-end amplifiers in factory-floor temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with ±5% tolerance and low tempco drift. Use Value: Enables <0.5% full-scale error in 12-bit ADC measurements across −40 °C to +125 °C ambient. |
| USB Port Overvoltage Protection | Programmable Logic Supply Clamp |
Use Scenario: Protecting USB 2.0 data line receivers from ESD-induced overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Fast-response shunt clamp activated by >5.88 V transients. Use Value: Leverages >16 kV HBM ESD rating and 66.9 Ω dynamic impedance to suppress 8/20 μs surges below IC damage threshold. | Use Scenario: Stabilizing 5 V supply to FPGA configuration I/O banks during power-up sequencing. IC Role / Device Role / Timing Role: Low-leakage voltage clamp ensuring clean reset signaling before core logic initialization. Use Value: Maintains <2.5 μA reverse current at 4.2 V VR, preventing false resets caused by supply droop or noise coupling. |
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 | 0.3 W rating, SOT-23 package, 60 Ω Zener impedance @ 5 mA | Limited to low-power signal-level clamping; not rated for AEC-Q101 | Select when board space is critical and power dissipation remains <300 mW |
| MMSZ5232BT1G | 0.5 W rating, SOD-123 package, 17 Ω Zener impedance @ 20 mA | Higher test current shifts regulation point; no AEC-Q101 qualification | Choose for tighter impedance where 20 mA bias is acceptable and automotive qualification is not required |
Compared with BZX84-C5V6LT1G and MMSZ5232BT1G, SZ1SMA5919BT3G delivers higher power handling (1.5 W), AEC-Q101 qualification, and superior thermal performance (250 °C/W) in the robust SMA package-making it the preferred choice for automotive and industrial power rail stabilization where reliability and surge margin are critical.
Availability
SZ1SMA5919BT3G is available at Aetrix Electronics and suitable for automotive power rail clamping, industrial sensor bias referencing, and USB port overvoltage protection requiring stable component supply and long-term lifecycle support.
Supply support for SZ1SMA5919BT3G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZ1SMA59xxBT3G series is part of onsemi's AEC-Q101-qualified Zener regulator portfolio, designed specifically for robust voltage reference and transient suppression in harsh-environment automotive and industrial power systems.
FAQ
What is the nominal zener voltage and tolerance of SZ1SMA5919BT3G?
The SZ1SMA5919BT3G has a nominal zener voltage of 5.6 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 5.32 V and 5.88 V when tested at IZT = 2.0 mA and thermal equilibrium. This tolerance is explicitly defined in the Electrical Characteristics table on page 2 of the onsemi datasheet for SZ1SMA5919BT3G.
Is SZ1SMA5919BT3G suitable for automotive applications?
Yes, SZ1SMA5919BT3G is AEC−Q101 qualified and PPAP capable, with explicit automotive qualification noted in the datasheet features list. Its −65 °C to +150 °C operating range, 16 kV HBM ESD rating, and Pb-free construction meet stringent automotive reliability requirements for power rail clamping and ECU voltage supervision.
What is the maximum power dissipation of SZ1SMA5919BT3G at room temperature?
SZ1SMA5919BT3G has a maximum DC power dissipation of 0.5 W at TA = 25 °C, with thermal derating at 4.0 mW/°C above that temperature. This value is specified in the Maximum Ratings table under "DC Power Dissipation @ TA = 25°C" and assumes use of onsemi's recommended FR-4 footprint.
What package type does SZ1SMA5919BT3G use, and what are its mounting options?
SZ1SMA5919BT3G uses the SMA (Case 403D) surface-mount package, featuring a flat handling surface and polarity band marking. The datasheet confirms it supports both top-slide and bottom-circuit-board mounting configurations, enabling flexible PCB layout in space-constrained designs.
How does the zener impedance of SZ1SMA5919BT3G affect its regulation performance?
SZ1SMA5919BT3G exhibits a maximum zener impedance of 66.9 Ω at IZT = 2.0 mA, directly impacting output voltage stability under varying load currents. Lower impedance yields tighter regulation-this value ensures minimal voltage deviation during small-signal biasing or transient clamping in 5 V systems.
SZ1SMA5919BT3G 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):
- 5.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 2.5 µA @ 3 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
SZ1SMA5919BT3G FAQ
1.How can I place an order for SZ1SMA5919BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5919BT3G 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 SZ1SMA5919BT3G reliable?
The price and inventory of SZ1SMA5919BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5919BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5919BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5919BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5919BT3G?
SZ1SMA5919BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5919BT3G 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 SZ1SMA5919BT3G?
For technical support, including SZ1SMA5919BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5919BT3G requirements.
6.How does Aetrix verify that SZ1SMA5919BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5919BT3G 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 SZ1SMA5919BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5919BT3G?
All SZ1SMA5919BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5919BT3G, 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 SZ1SMA5919BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5919BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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