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onsemi SZMMBZ5258BLT1G
- Part No.:
- SZMMBZ5258BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5258BLT1G.pdf
- Description:
- DIODE ZENER 36V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,729
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Product details
Overview
SZMMBZ5258BLT1G from onsemi is a 36 V nominal Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 70 Ω maximum dynamic impedance at 3.4 mA test current and 0.1 μA reverse leakage at 27 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5258BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.6%), thermal resistance (556 °C/W), AEC-Q101 qualification, ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals when reverse-biased above its 34.2–37.8 V breakdown range. It exhibits a positive temperature coefficient near 36 V, enabling predictable drift compensation in bias networks.
Designed for surface-mount assembly on FR-4/FR-5 boards, it delivers regulated reference voltage with minimal board area-critical for space-constrained applications like smartphone PMIC feedback loops and USB-C power delivery monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V (min) to 37.8 V (max) at 3.4 mA - defines regulation window for 36 V nominal rail stabilization |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets maximum continuous power handling without derating at 25°C ambient |
| Zener Impedance (ZZT) | 70 Ω max at IZT = 3.4 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 0.1 μA max at VR = 27 V - ensures low quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated SMT lines without special ESD controls |
| Thermal Resistance (RJA) | 556 °C/W - informs junction temperature rise under full power, critical for reliability in sealed enclosures |
| AEC-Q101 Qualified | Yes - validates suitability for automotive infotainment and body control module voltage references |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; polarity band indicates cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required |
| 3 | Cathode | Connected to regulated voltage rail; carries full Zener current during operation |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | Meets RoHS Directive 2011/65/EU and automotive material compliance requirements |
| Automotive-Grade Qualification | SZ prefix denotes AEC-Q101 qualification and PPAP capability for Tier-1 supply chain use |
| High-Density Packaging | SOT-23 footprint saves >60% board area vs. DO-35, enabling compact multi-rail power supervision |
| ESD Robustness | Class 3 HBM (>16 kV) eliminates need for external ESD protection in handheld product designs |
| Stable Low-Leakage Performance | 0.1 μA max IR at 75% of VZ ensures <1 nW standby power loss in battery-backed systems |
Applications
| USB Power Delivery Monitoring | Automotive Infotainment Biasing |
|---|---|
Use Scenario: Monitoring 20 V USB PD output rails for overvoltage shutdown logic. IC Role / Device Role / Timing Role: Shunt reference providing precise 36 V trip threshold for comparator input. Use Value: Tight ±5.6% VZ tolerance ensures consistent OVP activation across temperature and unit variance. |
Use Scenario: Generating stable bias voltage for audio amplifier ICs in vehicle head units. IC Role / Device Role / Timing Role: Voltage reference for op-amp feedback network regulating 3.3 V LDO output. Use Value: AEC-Q101 qualification guarantees operation across −40°C to +125°C engine bay environments. |
| Portable Medical Sensor Supply | Industrial PLC Input Protection |
Use Scenario: Stabilizing excitation voltage for MEMS pressure sensors in handheld diagnostics. IC Role / Device Role / Timing Role: Precision shunt regulator establishing 36 V reference for ADC driver stage. Use Value: 70 Ω ZZT minimizes voltage shift under sensor bias current variations up to ±1 mA. |
Use Scenario: Clamping transient surges on 24 V industrial digital input channels. IC Role / Device Role / Timing Role: Overvoltage protector limiting input to safe levels before optocoupler interface. Use Value: 225 mW rating supports sustained 30 V transients without thermal runaway in DIN-rail mounted controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5258BLT1G | Same Zener voltage range (34.2–37.8 V) and SOT-23 package, but not AEC-Q101 qualified | Lacks automotive qualification; suitable only for commercial-grade consumer electronics | Select when AEC-Q101 is not required and cost sensitivity outweighs automotive traceability needs |
| SZMMBZ5257BLT1G | Lower nominal Zener voltage (33 V), 58 Ω ZZT, same AEC-Q101 and SOT-23 | Used where 33 V regulation is preferred, e.g., legacy 3.3 V LDO feedback with higher divider ratio | Choose for tighter ZZT (58 Ω vs. 70 Ω) if system requires improved load regulation at lower voltage point |
Compared with MMBZ5258BLT1G and SZMMBZ5257BLT1G, SZMMBZ5258BLT1G uniquely combines AEC-Q101 compliance with 36 V nominal regulation-enabling drop-in use in automotive modules while maintaining identical SOT-23 layout and thermal behavior as its commercial counterpart.
Availability
SZMMBZ5258BLT1G is available at Aetrix Electronics and suitable for automotive infotainment systems, USB-C power delivery monitors, and portable medical sensor supplies requiring stable component supply with full AEC-Q101 traceability.
Supply support for SZMMBZ5258BLT1G 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.
SZMMBZ5258BLT1G belongs to the SZMMBZ52xxBLT1G series-engineered for high-reliability voltage reference and overvoltage protection in automotive and harsh-environment electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5258BLT1G?
The SZMMBZ5258BLT1G has a Zener voltage range of 34.2 V (minimum) to 37.8 V (maximum) at 3.4 mA test current, corresponding to ±5.6% tolerance around the nominal 36 V value. This tolerance is specified at 25°C ambient and remains stable across its operating temperature range of −65°C to +150°C, making SZMMBZ5258BLT1G suitable for precision reference applications where tight voltage bounds are required.
Is SZMMBZ5258BLT1G qualified for automotive use?
Yes, SZMMBZ5258BLT1G is AEC-Q101 qualified and PPAP capable, as indicated by the "SZ" prefix per onsemi's documentation. This certification confirms its reliability for automotive applications including infotainment systems, body control modules, and ADAS power supervision circuits. The device undergoes stress testing for temperature cycling, humidity, and mechanical shock per AEC standards-ensuring robust performance in vehicle environments.
What is the pin configuration of SZMMBZ5258BLT1G?
SZMMBZ5258BLT1G uses the SOT-23 package with Style 8 pinout: Pin 1 is Anode, Pin 2 is No Connection (NC), and Pin 3 is Cathode. The cathode is marked by a polarity band on the package body. This configuration is standardized across the MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series and must be observed during PCB layout to ensure correct reverse-bias operation of SZMMBZ5258BLT1G.
How does the thermal performance of SZMMBZ5258BLT1G compare between FR-5 and alumina substrates?
SZMMBZ5258BLT1G achieves 225 mW power dissipation on FR-5 board (RJA = 556 °C/W), but improves to 300 mW on alumina substrate (RJA = 417 °C/W). This 33% increase in power handling reflects superior heat conduction through ceramic versus standard PCB material. Engineers selecting SZMMBZ5258BLT1G for high-temperature industrial designs should consider alumina mounting to extend safe operating area without derating.
Does SZMMBZ5258BLT1G require external current limiting?
Yes, SZMMBZ5258BLT1G requires an external series resistor to limit reverse current and prevent thermal runaway. For example, at 48 V supply and 36 V regulation, a 360 Ω resistor limits current to ~33 mA-well within the 225 mW rating. The resistor value must be calculated based on worst-case supply voltage, minimum Zener voltage (34.2 V), and desired operating current, ensuring junction temperature stays below +150°C. This design constraint applies universally to all SZMMBZ5258BLT1G implementations.
SZMMBZ5258BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5258BLT1G FAQ
1.How can I place an order for SZMMBZ5258BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5258BLT1G 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 SZMMBZ5258BLT1G reliable?
The price and inventory of SZMMBZ5258BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5258BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5258BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5258BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5258BLT1G?
SZMMBZ5258BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5258BLT1G 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 SZMMBZ5258BLT1G?
For technical support, including SZMMBZ5258BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5258BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5258BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5258BLT1G 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 SZMMBZ5258BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5258BLT1G?
All SZMMBZ5258BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5258BLT1G, 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 SZMMBZ5258BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5258BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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