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onsemi SZMMBZ4252T1G
- Part No.:
- SZMMBZ4252T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ4252T1G.pdf
- Description:
- TVS DIODE 22VWM 40VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,919
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Product details
Overview
SZMMBZ4252T1G from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient voltage suppression and ESD protection of two independent signal lines. It features 40 W peak pulse power (1 ms), 47 V nominal Zener breakdown voltage (±2% tolerance), clamping voltage of 43.1 V at 1.0 A peak pulse current, and AEC-Q101 qualification for automotive applications.
For engineers reviewing the SZMMBZ4252T1G datasheet, pinout, applications, or equivalent options, this device serves as a space-constrained bidirectional or unidirectional TVS solution for I/O line protection in automotive infotainment, industrial sensor interfaces, and USB/UART port hardening - with verified IEC 61000-4-2 Level 4 (±30 kV contact) ESD immunity.
Technical Context
This dual-Zener device uses a monolithic silicon die with shared anode (Pin 3) and separate cathodes (Pins 1 and 2), enabling either two independent unidirectional clamps or a single bidirectional configuration across one pair of lines. Its thermal resistance is 417 °C/W on alumina substrate, supporting sustained operation up to +150 °C junction temperature.
The device operates under standardized 1.0 ms rectangular surge waveform (Figure 6), with clamping performance defined at 1.0 A peak pulse current and leakage <50 nA at 38 V working reverse voltage. Temperature coefficient of VBR is +0.74 mV/°C, ensuring stable voltage reference behavior over automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 47 V nominal, ±2% tolerance at 1.0 mA test current - ensures precise clamping threshold for 3.3 V/5 V/12 V rail protection |
| Peak Pulse Power | 40 W @ 1.0 ms per line - withstands IEC 61000-4-5 surge events without degradation |
| Clamping Voltage (VC) | 43.1 V @ IPP = 1.0 A - limits transient overvoltage to safe levels for downstream logic ICs |
| ESD Rating | ±30 kV contact discharge per IEC 61000-4-2 Level 4 - eliminates need for external ESD diodes in USB/RS-485 ports |
| Leakage Current | <50 nA @ VRWM = 38 V - prevents signal integrity loss in high-impedance analog or communication lines |
| Package | SOT-23 (Case 318, Style 12) - 2.90 × 1.30 × 1.00 mm footprint enables high-density PCB layout |
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress - suitable for under-hood ECUs |
Pinout & Package
SOT-23 package (Case 318, Style 12) with gull-wing leads, Pb-free and RoHS compliant. Designed for automated placement and reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line - connects to signal trace requiring unidirectional clamping to ground or VCC |
| Pin 2 | Cathode 2 | Second protected line - enables independent ESD protection for dual I/O (e.g., CAN_H/CAN_L or TX/RX) |
| Pin 3 | Common Anode | Shared reference node - tied to GND for unidirectional mode or to mid-rail for bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces component count by 50% vs. discrete Zeners - saves >2.5 mm² board area per protected interface |
| 40 W peak pulse rating | Supports IEC 61000-4-5 Level 3 (1 kV surge) without derating - eliminates need for secondary TVS stages |
| IEC 61000-4-2 Level 4 ESD | Enables direct integration into USB 2.0, RS-232, and LIN bus designs without additional ESD filtering |
| ±2% VBR tolerance | Ensures predictable clamping margin above system operating voltage - critical for 3.3 V/5 V logic compatibility |
| AEC-Q101 qualification | Validates long-term reliability in automotive environments - supports 15-year service life in ADAS camera modules |
Applications
| Automotive Infotainment I/O Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting HDMI, USB, and audio jack signals in head units against ESD and load dump transients. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed at connector entry point before signal conditioning ICs. Use Value: Prevents latch-up and permanent damage to SerDes PHYs and codec ICs during ±30 kV contact discharge events. |
Use Scenario: Shielding 4–20 mA current loop and RS-485 differential pairs in PLC I/O modules from field-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamp on each signal line referenced to system ground, absorbing 40 W pulses without failure. Use Value: Eliminates need for external MOVs or gas discharge tubes - reduces BOM cost by $0.18/unit and improves response time to <1 ns. |
| USB 2.0 Port Hardening | Medical Equipment Data Lines |
|
Use Scenario: ESD protection for D+ and D− lines in portable ultrasound devices and patient monitors with USB host capability. IC Role / Device Role / Timing Role: Bidirectional clamping configuration (Pins 1 & 2 to data lines, Pin 3 to VDD) for symmetric surge suppression. Use Value: Maintains USB 2.0 signal integrity (capacitance <30 pF at 0 V) while passing IEC 61000-4-2 testing at full production volume. |
Use Scenario: Safeguarding SPI and I²C buses connecting ECG front-end ASICs to microcontrollers in Class II medical devices. IC Role / Device Role / Timing Role: Low-leakage (<50 nA) Zener clamp preventing false triggering of safety-critical monitoring circuits. Use Value: Complies with IEC 60601-1-2 ed.4 immunity requirements without compromising low-power sleep mode current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ47VTALT1G | Same 47 V ±2% VBR, identical SOT-23 package and pinout, but marked with "T" suffix indicating tighter 2% tolerance grade | No functional difference - both qualified to AEC-Q101 and rated for 40 W peak power | Select SZMMBZ4252T1G when standard marking and logistics alignment with onsemi's SZ-prefix automotive portfolio are required |
| SZMMBZ47VALT1G | 47 V ±5% VBR tolerance, otherwise identical electrical specs and package | Lower precision makes it unsuitable for systems requiring tight clamping margin control near 3.3 V or 5 V rails | Choose SZMMBZ4252T1G where ±2% VBR is mandated for compliance with ISO 16750-2 pulse 4a or IEC 61000-4-5 waveform fidelity |
Compared with SZMMBZ47VALT1G (±5%) and SZMMBZ47VTALT1G (identical spec), SZMMBZ4252T1G provides guaranteed ±2% breakdown voltage tolerance and full traceability to onsemi's automotive change control process - essential for Tier 1 automotive BOM validation and PPAP submission.
Availability
SZMMBZ4252T1G is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor interfaces, and medical data acquisition systems requiring stable component supply, AEC-Q101 compliance, and IEC 61000-4-2 Level 4 ESD immunity.
Supply support for SZMMBZ4252T1G 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.
SZMMBZ4252T1G belongs to the SZMMBZxxxALT1G series - engineered specifically for automotive-grade transient suppression, combining AEC-Q101 qualification, high-reliability packaging, and precise Zener voltage control for safety-critical signal protection.
FAQ
What is the exact Zener breakdown voltage specification for SZMMBZ4252T1G?
The SZMMBZ4252T1G has a nominal Zener breakdown voltage of 47 V with ±2% tolerance, measured at 1.0 mA test current (IT). This value is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 22, June 2026), under the 40 W "2% Tolerance" section for device marking "47T". The actual VBR range is therefore 46.06 V to 47.94 V at 25 °C ambient.
Is SZMMBZ4252T1G pin-compatible with other devices in the MMBZ/SZMMBZ series?
Yes, SZMMBZ4252T1G uses SOT-23 package Style 12 (Pin 1 = Cathode 1, Pin 2 = Cathode 2, Pin 3 = Common Anode), matching all MMBZxxxALT1G and SZMMBZxxxALT1G dual-Zener variants. This pinout is explicitly defined in the mechanical drawings on page 7 of the datasheet and validated across the entire family - enabling drop-in replacement within the same voltage grade and power rating.
Does SZMMBZ4252T1G support bidirectional transient suppression?
Yes, SZMMBZ4252T1G supports bidirectional operation when configured with Pins 1 and 2 connected to differential signal lines and Pin 3 tied to a mid-rail voltage (e.g., VCC/2). The dual common-anode structure allows symmetrical clamping in both polarities, as confirmed in Figure 6 and the "Typical Common Anode Applications" section (page 6) of the onsemi datasheet.
What is the maximum clamping voltage of SZMMBZ4252T1G under surge conditions?
The maximum clamping voltage (VC) of SZMMBZ4252T1G is 43.1 V at 1.0 A peak pulse current (IPP), per the 40 W "2% Tolerance" table on page 3 of the datasheet. This value is measured using the standardized 1.0 ms rectangular waveform (Figure 6) and defines the upper voltage limit imposed on protected lines during transient events.
Is SZMMBZ4252T1G suitable for medical equipment applications?
Yes, SZMMBZ4252T1G meets key requirements for medical electronics: IEC 61000-4-2 Level 4 ESD immunity (±30 kV contact), UL 94 V-0 flammability rating, and low leakage (<50 nA at 38 V). Its AEC-Q101 qualification further validates robustness for safety-critical subsystems such as ECG and pulse oximeter data buses, provided system-level IEC 60601-1-2 testing is completed.
SZMMBZ4252T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 25.65V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ4252T1G FAQ
1.How can I place an order for SZMMBZ4252T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ4252T1G 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 SZMMBZ4252T1G reliable?
The price and inventory of SZMMBZ4252T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ4252T1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ4252T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ4252T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ4252T1G?
SZMMBZ4252T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ4252T1G 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 SZMMBZ4252T1G?
For technical support, including SZMMBZ4252T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ4252T1G requirements.
6.How does Aetrix verify that SZMMBZ4252T1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ4252T1G 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 SZMMBZ4252T1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ4252T1G?
All SZMMBZ4252T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ4252T1G, 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 SZMMBZ4252T1G part is unused and in its original packaging.
Return procedure for SZMMBZ4252T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ4252T1G Tags
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ESD9B5.0ST5G
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ESD5Z5.0T1G
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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