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onsemi SZMMBZ4252T3G
- Part No.:
- SZMMBZ4252T3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ4252T3G.pdf
- Description:
- TVS DIODE 27VWM SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
SZMMBZ4252T3G from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient overvoltage and ESD protection of two independent signal lines. It features 40 W peak pulse power (1 ms), 42 V nominal Zener voltage (±5% tolerance), clamping voltage of 59 V at 1.0 A peak pulse current, and AEC-Q101 qualification for automotive applications such as infotainment I/O line protection.
For engineers reviewing the SZMMBZ4252T3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional/unidirectional configuration flexibility, IEC 61000-4-2 Level 4 (±30 kV contact) ESD rating, low leakage (<50 nA @ 34 V), and thermal resistance of 417 °C/W on alumina substrate.
Technical Context
This device integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling either dual unidirectional protection (Pins 1–3 and 2–3) or single bidirectional protection (Pins 1–2). Its 40 W peak power rating applies under the standardized 1.0 ms rectangular waveform per Figure 6, with derating above 25 °C per Figure 7.
The SZMMBZ4252T3G operates across −55 °C to +150 °C junction temperature range, supports Pb-free reflow soldering up to 260 °C for 10 seconds, and meets UL 94 V-0 flammability requirements. Its 2% tolerance Zener voltage (42 V nominal) ensures precise clamping in high-reliability automotive interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 42 V nominal, ±2% tolerance - enables accurate voltage clamping for 36 V nominal automotive bus interfaces |
| Peak Pulse Power (PPK) | 40 W @ 1.0 ms - sustains high-energy transients without failure in CAN/LIN bus protection |
| Clamping Voltage (VC) | 59 V @ IPP = 1.0 A - limits downstream IC stress during ESD events per IEC 61000-4-2 |
| Working Peak Reverse Voltage (VRWM) | 34 V - defines maximum continuous reverse bias before significant leakage onset |
| ESD Rating | IEC 61000-4-2 Level 4: ±30 kV contact discharge - exceeds automotive OEM immunity requirements |
| Junction Temp Range | −55 °C to +150 °C - supports operation in engine bay and powertrain control modules |
| Thermal Resistance (RJA) | 417 °C/W on alumina substrate - informs heatsinking needs for sustained surge duty cycles |
Pinout & Package
SOT-23 (TO-236) package, case 318, style 12: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line cathode terminal; connects to signal line 1 in unidirectional mode |
| Pin 2 | Cathode 2 | Second protected line cathode terminal; connects to signal line 2 in unidirectional mode |
| Pin 3 | Anode (Common) | Shared anode node; ties to GND or reference rail for dual-line clamping |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Enables compact dual-line protection in one SOT-23 footprint - saves >50% board area vs. discrete diodes |
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD stress - supports PPAP documentation |
| IEC 61000-4-2 Level 4 compliance | Withstands ±30 kV contact discharge - eliminates need for external ESD suppressors in USB/CAN ports |
| Low leakage current | <50 nA @ 34 V - prevents signal integrity degradation in high-impedance sensor interfaces |
| 40 W peak pulse rating | Handles ISO 7637-2 pulse 1/2a/3a surges without degradation - suitable for 12 V/24 V vehicle systems |
Applications
| Automotive Infotainment I/O Protection | CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting HDMI, USB, and audio interface lines in head units against ESD and load dump coupling. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed between connector and PHY IC input pins. Use Value: Prevents latch-up or damage to high-speed interface receivers while maintaining signal integrity up to 100 MHz. |
Use Scenario: Safeguarding CANH/CANL differential pair inputs of transceivers in body control modules. IC Role / Device Role / Timing Role: Common-anode Zener clamp referenced to ground, absorbing fast transients induced by inductive switching. Use Value: Maintains CAN bus fault tolerance by limiting voltage excursions to <60 V during ISO 16750-2 pulses. |
| Industrial PLC Digital Input Protection | Medical Equipment Sensor Interface Protection |
|
Use Scenario: Shielding 24 V DC digital input channels from field wiring transients in factory automation controllers. IC Role / Device Role / Timing Role: Unidirectional Zener clamp (Pin 1–3 and Pin 2–3) on each input channel, tied to system ground. Use Value: Enables robust 24 V input stage design with <100 ns response time and no additional series impedance. |
Use Scenario: Guarding analog front-end inputs (ECG, SpO₂) against electrostatic discharge during patient handling. IC Role / Device Role / Timing Role: Bidirectional clamp (Pins 1–2) across differential sensor lines, referenced to shield ground. Use Value: Preserves microvolt-level signal fidelity while meeting IEC 60601-1-2 ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ47VT3G | 47 V nominal Zener voltage, same 40 W rating and SOT-23 package | Better suited for 42 V battery systems or higher-voltage industrial buses | Select when clamping threshold must exceed 42 V to avoid false triggering on normal operating transients |
| SMF42A | Single-line 40 W TVS diode in SOD-123, unidirectional only, no dual-junction capability | Requires two devices for dual-line protection; larger total footprint than SZMMBZ4252T3G | Choose only if layout constraints prevent common-anode routing or if asymmetric line protection is required |
Compared with SZMMBZ4252T3G, SZMMBZ47VT3G offers higher clamping threshold for 48 V systems but reduces margin for 36 V interfaces, while SMF42A lacks integrated dual-line architecture and increases component count and PCB area.
Availability
SZMMBZ4252T3G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC digital inputs, and medical sensor interfaces requiring stable component supply, AEC-Q101 compliance, and long-term lifecycle support.
Supply support for SZMMBZ4252T3G 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 SZMMBZxxxALT1G series targets high-reliability transient suppression in space-constrained automotive and industrial environments, with emphasis on AEC-Q101 qualification, IEC 61000-4-2 compliance, and dual-line integration.
FAQ
What is the Zener voltage tolerance for SZMMBZ4252T3G?
The SZMMBZ4252T3G has a nominal Zener voltage of 42 V with ±2% tolerance, verified per the Electrical Characteristics table on page 3 of the official onsemi datasheet. This tight tolerance ensures predictable clamping behavior in precision automotive voltage rails where overvoltage margins are narrow. The SZMMBZ4252T3G maintains this specification across its full operating temperature range of −55 °C to +150 °C.
How does SZMMBZ4252T3G differ from standard MMBZ4252T3G?
The "SZ" prefix in SZMMBZ4252T3G denotes automotive-grade qualification: it is AEC-Q101 certified, PPAP-capable, and manufactured under enhanced process controls for unique site and change management. Standard MMBZ4252T3G lacks these automotive-specific qualifications and traceability requirements. Both share identical electrical specs and SOT-23 package, but only SZMMBZ4252T3G meets OEM automotive supply chain mandates.
Can SZMMBZ4252T3G be used in bidirectional configuration?
Yes - SZMMBZ4252T3G supports bidirectional operation by connecting Pins 1 and 2 to the protected differential pair and Pin 3 to ground, forming a symmetrical clamp. This configuration leverages both Zener junctions back-to-back and is validated in the datasheet's Typical Common Anode Applications section. The SZMMBZ4252T3G achieves ±59 V clamping in this mode, matching IEC 61000-4-2 Level 4 requirements.
What is the maximum clamping voltage of SZMMBZ4252T3G at 1.0 A peak pulse current?
The maximum clamping voltage (VC) of SZMMBZ4252T3G is 59 V at IPP = 1.0 A, as specified in the 40 W Electrical Characteristics table on page 3 of the onsemi datasheet. This value is measured using the Figure 6 rectangular pulse waveform and defines the upper voltage limit imposed on protected circuitry during transient events. The SZMMBZ4252T3G maintains this clamping performance across its full temperature range.
Is SZMMBZ4252T3G RoHS compliant and halogen-free?
Yes - SZMMBZ4252T3G is Pb-free and RoHS compliant per the manufacturer's declaration on page 1 of the datasheet. It also meets JEDEC JS709E and IPC-1752A requirements for halogen-free materials (chlorine & bromine <900 ppm, total halogens <1500 ppm). The package uses void-free thermosetting plastic with UL 94 V-0 flammability rating, confirming full environmental compliance for global automotive and industrial deployment.
SZMMBZ4252T3G 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):
- 27V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- 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)
SZMMBZ4252T3G FAQ
1.How can I place an order for SZMMBZ4252T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ4252T3G 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 SZMMBZ4252T3G reliable?
The price and inventory of SZMMBZ4252T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ4252T3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ4252T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ4252T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ4252T3G?
SZMMBZ4252T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ4252T3G 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 SZMMBZ4252T3G?
For technical support, including SZMMBZ4252T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ4252T3G requirements.
6.How does Aetrix verify that SZMMBZ4252T3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ4252T3G 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 SZMMBZ4252T3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ4252T3G?
All SZMMBZ4252T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ4252T3G, 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 SZMMBZ4252T3G part is unused and in its original packaging.
Return procedure for SZMMBZ4252T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ4252T3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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