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onsemi SZMMBZ5238BLT1G
- Part No.:
- SZMMBZ5238BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5238BLT1G.pdf
- Description:
- DIODE ZENER 8.7V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,900
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Product details
Overview
SZMMBZ5238BLT1G from onsemi is a 225 mW, 8.7 V nominal Zener voltage regulator diode in SOT-23 package, designed for precision voltage clamping and reference applications in space-constrained circuits. It delivers 6.5 V reverse breakdown voltage tolerance (±5%), 600 Ω maximum dynamic impedance at 20 mA test current, and supports operation from −65°C to +150°C ambient. It is used in overvoltage protection for USB power rails and low-power sensor biasing networks.
For engineers reviewing the SZMMBZ5238BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity and no internal connection on pin 2. Its Zener breakdown mechanism provides stable regulation under reverse bias, with temperature coefficient near zero at its 8.7 V nominal point per typical characterization curves.
The SOT-23 package enables surface-mount assembly on high-density PCBs, and its Pb-free, halogen-free construction complies with RoHS and automotive PPAP requirements. Thermal derating is linear at 1.8 mW/°C above 25°C on FR-5 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V nominal, 8.26–9.14 V range at 20 mA - defines precise clamping threshold for 9 V rail protection |
| Power Dissipation (PD) | 225 mW on FR-5 board - limits continuous dissipation without heatsinking in compact layouts |
| Zener Impedance (ZZT) | 600 Ω max at IZT = 20 mA - ensures minimal voltage shift under load variation |
| Reverse Leakage (IR) | 3 μA max at VR = 6.5 V - guarantees low standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced electrostatic discharge during assembly |
| Operating Temp | −65°C to +150°C - supports under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronics with full PPAP documentation support |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch. Void-free thermosetting plastic case with corrosion-resistant, solderable finish. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current if biased positively |
| 2 | No Connection | Internally unconnected; must remain floating - not tied to ground or signal |
| 3 | Cathode | Connected to higher-potential node in reverse-bias configuration; defines regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage clamping without external heat sinking on standard FR-5 PCBs |
| 8.7 V Nominal Zener Voltage | Optimized for 9 V system rail stabilization with ±5% tolerance matching common supply tolerances |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in handheld and portable designs |
| AEC-Q101 Qualification | Validates reliability for automotive infotainment, body control, and ADAS subsystems |
| Pb-Free / Halogen-Free | Meets global environmental compliance mandates including RoHS and ELV directives |
Applications
| USB Power Rail Protection | Automotive Sensor Biasing |
|---|---|
Use Scenario: Clamping transient spikes on 5 V USB VBUS lines during hot-plug events or ESD events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response overvoltage clamping at the input stage. Use Value: Limits voltage excursion to ≤9.14 V, protecting downstream USB controllers rated for 5.5 V absolute maximum. | Use Scenario: Providing stable 8.7 V reference for analog front-end amplifiers in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Precision DC voltage reference source for ratiometric sensor excitation. Use Value: Maintains <±0.5% drift over −40°C to +125°C due to near-zero TC at 8.7 V, improving measurement accuracy. |
| Portable Device Battery Monitoring | Industrial PLC Input Conditioning |
Use Scenario: Regulating voltage for fuel gauge ICs in lithium-ion battery packs operating across 3.0–4.2 V cell ranges. IC Role / Device Role / Timing Role: Zener-based reference generator feeding ADC reference inputs in battery management units. Use Value: Delivers 3 μA leakage at 6.5 V, minimizing quiescent current drain in always-on monitoring circuits. | Use Scenario: Level-shifting and overvoltage protection for 24 V digital inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Front-end clamp limiting input transients before optocoupler isolation stages. Use Value: Withstands 150°C junction temperature and 225 mW surge, enabling reliable operation in factory-floor enclosures. |
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-C8V2LT1G | 8.2 V nominal, ±5% tolerance, 350 mW rating, same SOT-23 package | Lower clamping voltage; higher power allows greater surge handling but less precise match to 9 V rail margin | Select when tighter thermal margin is needed or where 8.2 V regulation suffices |
| SZMMBZ5237BLT1G | 8.2 V nominal, ±5% tolerance, identical 225 mW rating and AEC-Q101 qualification | 0.5 V lower Zener voltage; same pinout and footprint - direct substitution only if circuit tolerates reduced clamp level | Choose for legacy designs originally specifying 8.2 V or where lower voltage headroom is acceptable |
Compared with BZX84-C8V2LT1G and SZMMBZ5237BLT1G, SZMMBZ5238BLT1G offers optimal 8.7 V clamping for 9 V nominal systems, balancing margin against overvoltage risk while maintaining automotive qualification and identical SOT-23 layout compatibility.
Availability
SZMMBZ5238BLT1G is available at Aetrix Electronics and suitable for USB power protection, automotive sensor biasing, and industrial PLC input conditioning requiring stable component supply, AEC-Q101 compliance, and RoHS-conforming packaging.
Supply support for SZMMBZ5238BLT1G 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 MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series targets space-constrained, high-reliability voltage regulation - specifically engineered for portable electronics, automotive subsystems, and industrial controls needing precision Zener references in ultra-small packages.
FAQ
What is the Zener voltage tolerance of SZMMBZ5238BLT1G?
The SZMMBZ5238BLT1G has a Zener voltage tolerance of ±5% around its nominal 8.7 V value, resulting in a guaranteed range of 8.26 V to 9.14 V at 20 mA test current. This tolerance is specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The tight tolerance ensures predictable clamping behavior in precision reference and overvoltage protection circuits using SZMMBZ5238BLT1G.
Is SZMMBZ5238BLT1G qualified for automotive applications?
Yes, SZMMBZ5238BLT1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive electronics including body control modules, infotainment systems, and ADAS sensors. The "SZ" prefix explicitly denotes automotive-grade process control and site-specific change management. This qualification is documented in the Features section of the onsemi datasheet, and SZMMBZ5238BLT1G meets all stress testing and reliability requirements defined in the AEC-Q101 standard.
What is the pin configuration of SZMMBZ5238BLT1G?
SZMMBZ5238BLT1G uses the SOT-23 package with pin 1 as anode, pin 2 as no connection (NC), and pin 3 as cathode - confirmed in the Marking Diagram and Mechanical Characteristics sections of the datasheet. Pin 2 must remain unconnected in PCB layout; routing it to ground or signal violates the device's internal structure. This pinout is standardized across the MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series, and SZMMBZ5238BLT1G follows Style 8 per the SOT-23 mechanical outline drawing.
Does SZMMBZ5238BLT1G have ESD protection built-in?
Yes, SZMMBZ5238BLT1G features Class 3 human body model (HBM) ESD protection rated at >16 kV, as stated in the Features section of the onsemi datasheet. This level of robustness eliminates the need for discrete ESD suppressors in many portable and handheld applications. The ESD capability is inherent to the device's silicon structure and packaging, and applies directly to SZMMBZ5238BLT1G without requiring external components.
What is the maximum power dissipation of SZMMBZ5238BLT1G on FR-5 board?
SZMMBZ5238BLT1G has a maximum power dissipation of 225 mW at 25°C ambient on FR-5 board, with linear derating of 1.8 mW/°C above that temperature. This rating is specified in the Maximum Ratings table and reflects real-world thermal performance on standard PCB materials. Engineers must apply this derating curve when designing for elevated ambient temperatures, and SZMMBZ5238BLT1G remains within safe operating limits up to +150°C junction temperature under appropriate layout conditions.
SZMMBZ5238BLT1G 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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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)
SZMMBZ5238BLT1G FAQ
1.How can I place an order for SZMMBZ5238BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5238BLT1G 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 SZMMBZ5238BLT1G reliable?
The price and inventory of SZMMBZ5238BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5238BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5238BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5238BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5238BLT1G?
SZMMBZ5238BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5238BLT1G 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 SZMMBZ5238BLT1G?
For technical support, including SZMMBZ5238BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5238BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5238BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5238BLT1G 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 SZMMBZ5238BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5238BLT1G?
All SZMMBZ5238BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5238BLT1G, 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 SZMMBZ5238BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5238BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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