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onsemi SZMMBZ5242BLT1G
- Part No.:
- SZMMBZ5242BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5242BLT1G.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:31,930
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Product details
Overview
SZMMBZ5242BLT1G from onsemi is a 12 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 30 Ω dynamic impedance at 20 mA test current and 1 μA reverse leakage at 9.1 V, used for voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZMMBZ5242BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and Pb-free RoHS compliance.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for reverse-bias regulation. Its nominal 12 V Zener voltage exhibits a positive temperature coefficient near zero crossing, and it maintains stable regulation under pulse test conditions (IZT = 20 mA, TA = 25°C).
The SOT-23 package features a no-connect terminal (Pin 2), enabling mechanical stability without electrical function. Thermal performance is specified for both FR-5 (225 mW) and alumina substrates (300 mW), supporting design flexibility across PCB material classes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V @ IZT = 20 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board - maximum continuous power handling at 25°C ambient, derated 1.8 mW/°C above |
| Zener Impedance (ZZT) | 30 Ω @ IZT = 20 mA - low dynamic impedance ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 1 μA @ VR = 9.1 V - confirms tight regulation threshold before breakdown onset |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated assembly and end-use environments |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - determines junction temperature rise per unit power, critical for reliability in compact layouts |
| AEC-Q101 Qualified | Yes - validates suitability for automotive electronic control units requiring stress-tested component reliability |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated circuit; forward bias path for testing and protection |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode | Connected to higher-potential side; Zener breakdown occurs between Cathode and Anode |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - meets automotive electronics production traceability and stress-test requirements |
| Pb-free and RoHS compliance | Fully compliant with EU RoHS Directive and halogen-free/BFR-free standards - supports global environmental compliance programs |
| High-density packaging | SOT-23 footprint (2.9 × 1.3 mm) enables placement on high-density PC boards where space is constrained |
| ESD-hardened construction | Class 3 human body model rating (>16 kV) - eliminates need for external ESD protection in many portable designs |
| Stable low-current regulation | 1 μA leakage at 9.1 V ensures predictable turn-on behavior in battery-powered standby circuits |
Applications
| Cellular Phone Power Rail Clamping | Automotive Body Control Module Reference |
|---|---|
|
Use Scenario: Clamping transient overvoltage on 12 V supply rail during load dump events in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing passive overvoltage protection without active control logic. Use Value: Limits rail voltage to ≤12.6 V using only 225 mW dissipation, avoiding damage to baseband ICs and RF front-end components. |
Use Scenario: Providing stable 12 V reference for microcontroller ADC calibration in door module ECUs. IC Role / Device Role / Timing Role: Precision voltage reference source with <±5% tolerance and low tempco near 12 V. Use Value: Enables accurate sensor signal digitization without external trimming, leveraging AEC-Q101 qualification for automotive lifecycle assurance. |
| Handheld Medical Monitor Battery Protection | Industrial IoT Sensor Node Voltage Clamp |
|
Use Scenario: Protecting lithium-ion battery management circuitry from reverse-polarity connection during field servicing. IC Role / Device Role / Timing Role: Bidirectional clamping element used in conjunction with series diode to limit reverse voltage exposure. Use Value: Withstands >16 kV ESD and operates down to −65°C, ensuring reliability in clinical environments with frequent handling. |
Use Scenario: Regulating auxiliary 12 V rail for LoRaWAN transceiver power conditioning in edge-node gateways. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator stabilizing supply for RF ICs during burst transmission cycles. Use Value: 30 Ω ZZT minimizes voltage droop during 20 mA peak current pulses, maintaining RF output consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242BLT1G | Same Zener voltage (11.4–12.6 V), identical SOT-23 package, but not AEC-Q101 qualified | Lacks automotive qualification and PPAP capability; suitable for commercial portable devices only | Select when automotive compliance is unnecessary and cost sensitivity outweighs qualification requirements |
| SZMMBZ5242BLT3G | Identical electrical specs and AEC-Q101 qualification, but supplied in 10,000-piece tape-and-reel vs. 3,000-piece for SZMMBZ5242BLT1G | Better suited for high-volume automated assembly lines requiring longer reel lengths | Choose for large-scale production runs where feeder change frequency and line uptime are critical |
Compared with MMBZ5242BLT1G, SZMMBZ5242BLT1G adds automotive qualification without sacrificing electrical performance; compared with SZMMBZ5242BLT3G, it offers identical functionality in smaller reels for prototyping and medium-volume builds.
Availability
SZMMBZ5242BLT1G is available at Aetrix Electronics and suitable for cellular phones, automotive body control modules, and handheld medical monitors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5242BLT1G 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 supplier of energy-efficient semiconductor solutions, headquartered in Phoenix, Arizona, serving automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was developed to deliver compact, reliable Zener regulation for space-constrained portable and automotive electronics, emphasizing high ESD immunity and AEC-Q101 compliance.
FAQ
What is the Zener voltage tolerance of SZMMBZ5242BLT1G?
The SZMMBZ5242BLT1G has a Zener voltage range of 11.4 V to 12.6 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 12 V value. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is verified per onsemi's production test flow. The SZMMBZ5242BLT1G datasheet specifies this range in the Electrical Characteristics table on page 3.
Is SZMMBZ5242BLT1G suitable for automotive applications?
Yes, SZMMBZ5242BLT1G is explicitly AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment power supplies, and sensor interface circuits. The "SZ" prefix denotes automotive-grade manufacturing controls and site-specific change management, and the device meets all stress tests required by AEC-Q101 Rev D. This qualification is documented in the Features section of the SZMMBZ5242BLT1G datasheet.
What is the thermal resistance of SZMMBZ5242BLT1G on standard PCB material?
The thermal resistance junction-to-ambient (RJA) for SZMMBZ5242BLT1G is 556 °C/W when mounted on FR-5 board, as specified in the Maximum Ratings table. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board). Derating is linear at 1.8 mW/°C above 25°C ambient, limiting usable power dissipation in high-temperature environments. The SZMMBZ5242BLT1G datasheet confirms this on page 1 under "Maximum Ratings."
Does SZMMBZ5242BLT1G have a no-connect pin, and how should it be handled in layout?
Yes, SZMMBZ5242BLT1G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8) and Electrical Characteristics table. In PCB layout, Pin 2 must remain unconnected - neither routed nor soldered - to prevent unintended coupling or thermal interference. The SOT-23 package uses this terminal solely for mechanical stability. This configuration is confirmed in the "MARKING DIAGRAM" and "MECHANICAL CASE OUTLINE" sections of the SZMMBZ5242BLT1G datasheet.
How does the ESD rating of SZMMBZ5242BLT1G compare to standard commercial Zeners?
SZMMBZ5242BLT1G achieves Class 3 Human Body Model ESD rating (>16 kV), exceeding typical commercial Zeners rated at Class 2 (≥4 kV) or unqualified parts. This high ESD immunity is built into the die and package design, eliminating the need for external TVS diodes in many portable applications. The rating is verified per ANSI/ESDA/JEDEC JS-001 and is stated in the Features section of the SZMMBZ5242BLT1G datasheet.
SZMMBZ5242BLT1G 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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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)
SZMMBZ5242BLT1G FAQ
1.How can I place an order for SZMMBZ5242BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5242BLT1G 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 SZMMBZ5242BLT1G reliable?
The price and inventory of SZMMBZ5242BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5242BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5242BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5242BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5242BLT1G?
SZMMBZ5242BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5242BLT1G 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 SZMMBZ5242BLT1G?
For technical support, including SZMMBZ5242BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5242BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5242BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5242BLT1G 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 SZMMBZ5242BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5242BLT1G?
All SZMMBZ5242BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5242BLT1G, 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 SZMMBZ5242BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5242BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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