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onsemi SZMMBZ5242ELT1G
- Part No.:
- SZMMBZ5242ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5242ELT1G.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SZMMBZ5242ELT1G from onsemi is a 12 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 30 Ω dynamic impedance at 20 mA test current and 1 μA leakage at 9.1 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5242ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and automotive-grade traceability per PPAP.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown at nominal 12 V with tight 11.4–12.6 V range. Its 30 Ω Zener impedance at IZT = 20 mA ensures stable regulation under moderate load transients.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with polarity indicated by a band. It supports automated placement and reflow soldering up to 260°C for 10 seconds, meeting UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V @ IZT = 20 mA - defines regulated output voltage window for reference or clamping |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 30 Ω @ IZT = 20 mA - determines AC regulation stability and ripple rejection capability |
| Leakage Current (IR) | 1 μA @ VR = 9.1 V - specifies off-state current in pre-breakdown region, critical for low-power standby |
| ESD Rating | Class 3 (>16 kV) per HBM - enables robust handling in high-static manufacturing and end-use environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient conditions |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - quantifies self-heating rise per watt, guiding layout and airflow requirements |
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; cathode marked by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤9.1 V to avoid leakage conduction |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required - must remain floating |
| 3 | Cathode | Connected to higher-potential node; polarity band aligns with this terminal for visual orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation |
| Pb-Free & RoHS Compliant | Meets global environmental regulations; "G" suffix confirms lead-free termination and packaging |
| High ESD Robustness | Withstands >16 kV human-body-model discharge without parameter shift - reduces need for external TVS staging |
| Low-Leakage Regulation | 1 μA max IR at 9.1 V enables use in battery-backed circuits where quiescent current must stay below 10 μA |
| Optimized for High-Density Layout | Small SOT-23 footprint allows placement near IC power pins for local rail stabilization without consuming board area |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 12 V supply rail for microcontroller I/O and CAN transceiver bias in BCM subassemblies. IC Role / Device Role / Timing Role: Voltage reference and transient clamp protecting downstream logic from load-dump spikes. Use Value: Maintains stable 12 V reference despite ±15% battery variation and absorbs 225 W peak pulses per ISO 7637-2 Pulse 5a. |
Use Scenario: Providing precise 12 V reference for 16-bit ADC front-end in temperature/pressure sensor nodes. IC Role / Device Role / Timing Role: Low-drift Zener reference source with <1 μA leakage enabling <100 nA system sleep current. Use Value: Enables ±0.1% full-scale accuracy over −40°C to +125°C without active regulation or trimming. |
| Portable Medical Monitoring Device | 5G Small Cell Power Management |
Use Scenario: Clamping ESD events on USB-C VBUS line during hot-plug in handheld ECG monitors. IC Role / Device Role / Timing Role: Primary ESD protection element with 16 kV HBM rating and fast turn-on to limit voltage overshoot. Use Value: Prevents latch-up in USB PD controller ICs while adding <0.5 mm² footprint - no additional TVS needed. |
Use Scenario: Stabilizing bias voltage for GaN FET gate drivers in remote radio head DC-DC converters. IC Role / Device Role / Timing Role: Local 12 V reference for driver IC enable threshold and fault detection comparators. Use Value: Ensures consistent gate drive timing across −30°C to +85°C ambient with <50 ppm/°C tempco below 12 V. |
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-C12LT1G | 12 V ±5%, 350 mW PD, 25 Ω ZZT @ 5 mA, non-AEC-Q101 | Lacks automotive qualification and PPAP support; higher power but lower test current sensitivity | Select when cost-sensitive industrial designs require higher power margin and AEC-Q101 is not mandated |
| SZBZX84C12LT1G | 12 V ±5%, 350 mW PD, 25 Ω ZZT @ 5 mA, AEC-Q101 qualified | Higher power rating but tested at lower IZT; less stable regulation under 20 mA loads than SZMMBZ5242ELT1G | Prefer for automotive systems needing >225 mW headroom, accepting trade-off in dynamic impedance performance |
Compared with BZX84-C12LT1G and SZBZX84C12LT1G, SZMMBZ5242ELT1G delivers tighter regulation at 20 mA with lower thermal resistance (556 vs. ~625 °C/W), making it optimal for space-constrained, thermally sensitive automotive and portable applications where 225 mW suffices.
Availability
SZMMBZ5242ELT1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical devices, and 5G infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5242ELT1G 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.
SZMMBZ5242ELT1G belongs to the AEC-Q101-qualified MMBZ52xx/SZMMBZ52xx Zener regulator family, engineered for reliable voltage reference and overvoltage protection in harsh-environment electronics where space, ESD immunity, and automotive compliance are critical.
FAQ
What is the Zener voltage tolerance of SZMMBZ5242ELT1G?
The SZMMBZ5242ELT1G has a Zener voltage range of 11.4 V to 12.6 V at IZT = 20 mA, corresponding to a ±5% tolerance around the nominal 12 V rating. This tolerance is guaranteed across the full operating temperature range of −65°C to +150°C and is verified per onsemi's AEC-Q101 stress testing protocol.
Is SZMMBZ5242ELT1G suitable for automotive applications?
Yes, SZMMBZ5242ELT1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific process controls, site traceability, and change management. It meets requirements for under-hood and cabin modules including body control units, ADAS sensors, and infotainment power supplies.
What is the meaning of Pin 2 being "No Connection" in SZMMBZ5242ELT1G?
Pin 2 in SZMMBZ5242ELT1G is internally unconnected and must remain electrically floating on the PCB. It serves no circuit function and should not be tied to ground, VCC, or any other net - doing so may compromise thermal performance or cause unintended parasitic coupling in high-frequency layouts.
How does the ESD rating of SZMMBZ5242ELT1G compare to standard Zeners?
SZMMBZ5242ELT1G achieves Class 3 HBM ESD rating (>16 kV), exceeding typical Zener diodes rated at 8 kV or less. This is achieved via optimized junction design and passivation, enabling direct placement on I/O lines in portable and automotive systems without supplemental ESD protection.
Can SZMMBZ5242ELT1G replace MMBZ5242ELT1G in existing designs?
Yes, SZMMBZ5242ELT1G is a drop-in replacement for MMBZ5242ELT1G with identical electrical specs, pinout, and package. The "SZ" prefix adds automotive qualification and enhanced traceability but maintains full functional and mechanical compatibility - no layout or firmware changes are required.
SZMMBZ5242ELT1G 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)
SZMMBZ5242ELT1G FAQ
1.How can I place an order for SZMMBZ5242ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5242ELT1G 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 SZMMBZ5242ELT1G reliable?
The price and inventory of SZMMBZ5242ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5242ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5242ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5242ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5242ELT1G?
SZMMBZ5242ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5242ELT1G 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 SZMMBZ5242ELT1G?
For technical support, including SZMMBZ5242ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5242ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5242ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5242ELT1G 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 SZMMBZ5242ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5242ELT1G?
All SZMMBZ5242ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5242ELT1G, 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 SZMMBZ5242ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5242ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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