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onsemi SZMMSZ5259BT1G
- Part No.:
- SZMMSZ5259BT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5259BT1G.pdf
- Description:
- DIODE ZENER 39V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:14,072
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Product details
Overview
SZMMSZ5259BT1G from onsemi is a 39 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 80 Ω dynamic impedance at 3.2 mA test current and 0.1 μA leakage at 30 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, automotive sensor signal conditioning, and industrial power supply feedback paths.
For engineers reviewing the SZMMSZ5259BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 39 V nominal Zener voltage, ±5% tolerance, thermal equilibrium–specified VZ, 150°C maximum junction temperature, and AEC−Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal voltage regulator diode, maintaining stable reverse breakdown voltage under controlled current conditions. Its Zener voltage is specified with the device junction in thermal equilibrium at TL = 30°C ±1°C, ensuring repeatable calibration across production lots.
The SOD−123 package provides optimized thermal resistance (RJL = 150°C/W) and supports automated assembly. ESD robustness exceeds 16 kV per Human Body Model, and it meets UL 94 V−0 flammability rating with Pb−free construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05 V min / 39 V nom / 40.95 V max @ IZT = 3.2 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 80 Ω max @ IZT = 3.2 mA - determines voltage regulation stability under small-signal AC variations |
| Leakage Current (IR) | 0.1 μA max @ VR = 30 V - ensures minimal parasitic current draw in standby or high-impedance bias networks |
| Junction Temperature Range | −55°C to +150°C - enables operation in under-hood automotive, industrial control, and outdoor electronics environments |
| ESD Rating | Class 3 (>16 kV) HBM - protects against electrostatic discharge during handling and PCB assembly without external protection |
| Tolerance | ±5% - specifies allowable deviation of nominal 39 V Zener voltage for cost-sensitive, non-critical reference applications |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), dimensions 1.60 × 2.69 × 1.16 mm, cathode indicated by polarity band. Designed for high-density layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased to conduct and clamp at VZ |
| 2 (Anode) | Reference/ground terminal | Typically tied to circuit ground or lower-potential rail; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP compliance |
| Thermal equilibrium VZ specification | Ensures consistent Zener voltage calibration across temperature gradients and manufacturing batches |
| 16 kV HBM ESD rating | Eliminates need for discrete ESD protection in many low-energy signal-path designs |
| Pb−free, RoHS-compliant | Meets global environmental regulations and supports lead-free reflow soldering profiles up to 260°C for 10 seconds |
| UL 94 V−0 flammability | Reduces fire risk in enclosed enclosures and safety-critical systems |
Applications
| Automotive Sensor Signal Conditioning | Industrial Power Supply Feedback |
|---|---|
|
Use Scenario: Stabilizing reference voltage for analog front-end circuits in wheel speed or temperature sensors exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Zener voltage reference providing stable bias point for op-amp comparators and ADC input scaling networks. Use Value: Maintains <±1% output accuracy over −40°C to +125°C due to tight 39 V ±5% tolerance and low TC drift in this voltage range. |
Use Scenario: Setting precise feedback threshold in isolated flyback or buck-boost converters for factory automation equipment. IC Role / Device Role / Timing Role: Shunt regulator element in optocoupler-based feedback loop, clamping error amplifier reference voltage. Use Value: Delivers stable 39 V reference with 80 Ω ZZT to minimize load-regulation error and improve transient response. |
| Low-Power Analog Reference | Overvoltage Clamp for MCU I/O |
|
Use Scenario: Generating local 39 V reference for precision current sensing or DAC output buffering in battery-powered instrumentation. IC Role / Device Role / Timing Role: Passive voltage reference source replacing higher-cost IC references where moderate accuracy suffices. Use Value: Enables compact, low-quiescent-current design with 0.1 μA leakage at 30 V, minimizing standby power loss. |
Use Scenario: Protecting 3.3 V or 5 V microcontroller GPIO pins from transient surges in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage excursions above safe logic thresholds. Use Value: Responds within nanoseconds to transients up to 500 mW peak power, leveraging SOD−123 thermal mass and low capacitance. |
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-C39LT1G | Same 39 V ±5%, but rated 300 mW and uses SOT−23 package with RJA = 375°C/W | Lower power handling and higher thermal resistance limit use in sustained high-current regulation | Select when footprint compatibility with SOT−23 is required and power demand stays below 300 mW |
| SZBZX84C39LT1G | AEC−Q101 qualified like SZMMSZ5259BT1G, but 300 mW rating and SOT−23 package | Lacks the 500 mW capability and superior thermal performance (RJL = 150°C/W) of SOD−123 | Choose only if legacy SOT−23 layout must be retained and automotive qualification is mandatory |
Compared with BZX84-C39LT1G and SZBZX84C39LT1G, SZMMSZ5259BT1G delivers 67% higher power rating and 42% lower junction-to-lead thermal resistance, enabling more robust voltage clamping in thermally constrained automotive and industrial PCBs without redesigning the layout.
Availability
SZMMSZ5259BT1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supplies, low-power analog references, and overvoltage protection circuits requiring stable component supply and AEC−Q101 compliance.
Supply support for SZMMSZ5259BT1G 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.
The MMSZ52xxxT1G/SZMMSZ52xxxT1G series was designed specifically for cost-effective, space-constrained voltage regulation and clamping in automotive and industrial electronics where AEC−Q101 reliability and Pb−free compliance are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ5259BT1G?
The SZMMSZ5259BT1G has a nominal Zener voltage of 39 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 37.05 V and 40.95 V when measured under thermal equilibrium conditions at IZT = 3.2 mA. This tolerance reflects the standard binning for "B" suffix devices in the MMSZ52xxxT1G family and is verified per onsemi's production test flow.
Is SZMMSZ5259BT1G suitable for automotive applications?
Yes, SZMMSZ5259BT1G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and process controls. Its −55°C to +150°C junction temperature range, 16 kV HBM ESD rating, and Pb−free construction meet core requirements for under-hood and body electronics.
What is the maximum power dissipation of SZMMSZ5259BT1G and how does it derate with temperature?
SZMMSZ5259BT1G is rated for 500 mW total power dissipation on an FR−5 board at lead temperature (TL) = 75°C. Above 75°C, it derates linearly at 6.7 mW/°C. This derating curve is defined in the Maximum Ratings table and assumes proper PCB copper area per the recommended footprint to maintain thermal equilibrium.
What package type and dimensions does SZMMSZ5259BT1G use?
SZMMSZ5259BT1G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. The cathode is marked by a polarity band, and the package supports reflow soldering up to 260°C for 10 seconds. Its compact size enables high-density placement in space-constrained designs.
How does the Zener impedance of SZMMSZ5259BT1G affect its regulation performance?
SZMMSZ5259BT1G has a maximum Zener impedance (ZZT) of 80 Ω at IZT = 3.2 mA, which directly impacts voltage regulation stability: lower ZZT means less variation in output voltage for a given change in current. This value ensures predictable clamping behavior in feedback loops and reference networks where load current may fluctuate.
SZMMSZ5259BT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ5259BT1G FAQ
1.How can I place an order for SZMMSZ5259BT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5259BT1G 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 SZMMSZ5259BT1G reliable?
The price and inventory of SZMMSZ5259BT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5259BT1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5259BT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5259BT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5259BT1G?
SZMMSZ5259BT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5259BT1G 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 SZMMSZ5259BT1G?
For technical support, including SZMMSZ5259BT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5259BT1G requirements.
6.How does Aetrix verify that SZMMSZ5259BT1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5259BT1G 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 SZMMSZ5259BT1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5259BT1G?
All SZMMSZ5259BT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5259BT1G, 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 SZMMSZ5259BT1G part is unused and in its original packaging.
Return procedure for SZMMSZ5259BT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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