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onsemi S2ZMMBZ18VALT1G
- Part No.:
- S2ZMMBZ18VALT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
S2ZMMBZ18VALT1G.pdf
- Description:
- TVS DIODE SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:31,846
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Product details
Overview
S2ZMMBZ18VALT1G 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 18 V nominal Zener breakdown voltage (17.1–18.9 V), 40 W peak pulse power at 1.0 ms, ±30 kV IEC 61000-4-2 contact discharge rating, and clamps to ≤25 V at 1.6 A peak pulse current - deployed in USB data lines, I²C buses, and microcontroller GPIO protection.
For engineers reviewing the S2ZMMBZ18VALT1G datasheet, pinout, applications, or equivalent options, this device serves as a space-constrained, bidirectional-capable dual-line TVS solution with automotive-grade AEC-Q101 qualification, low leakage (<50 nA @ 14.5 V), and UL 94 V-0 flammability compliance.
Technical Context
This dual-junction Zener operates in either unidirectional mode (pins 1–3 or 2–3) or bidirectional mode (pins 1–2), leveraging a shared anode (pin 3) to protect two lines simultaneously. Its thermal resistance is 417 °C/W on alumina substrate and 556 °C/W on FR-5 board, enabling robust surge handling under transient conditions.
The device meets Class 3B ESD per HBM (>16 kV) and Class C per MM (>400 V), with clamping voltage tightly specified at 25 V @ 1.6 A IPP. Temperature coefficient of VBR is +1.6 mV/°C, ensuring stable voltage reference behavior across −55 °C to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 17.1–18.9 V @ IT = 1.0 mA - defines precise clamping threshold for 18 V rail protection |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - sustains high-energy transients without failure in industrial I/O interfaces |
| Clamping Voltage (VC) | 25 V @ IPP = 1.6 A - ensures downstream ICs see <25 V during ESD events |
| Reverse Leakage (IR) | <50 nA @ VRWM = 14.5 V - minimizes standby power loss in battery-powered sensors |
| ESD Rating | ±30 kV contact discharge per IEC 61000-4-2 Level 4 - exceeds standard USB/USB-C immunity requirements |
| Package | SOT-23 (Case 318, Style 12) - enables 2.9 × 1.3 mm PCB footprint for high-density routing |
| AEC-Q101 Qualified | Yes - validated for automotive infotainment and body control module applications |
Pinout & Package
SOT-23 package (Case 318, Style 12) with void-free thermosetting plastic case, UL 94 V-0 rated, and 260 °C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line cathode - connects to signal line 1 in unidirectional configuration |
| Pin 2 | Cathode 2 | Second protected line cathode - connects to signal line 2; enables dual-line protection in one footprint |
| Pin 3 | Anode (Common) | Shared anode tied to GND or reference plane - forms dual Zener junctions with pins 1 and 2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Protects two independent signal paths (e.g., SDA/SCL or D+/D−) using single SOT-23 footprint |
| Bidirectional capability | Enables symmetric clamping between pins 1 and 2 without external components - ideal for AC-coupled data lines |
| Automotive qualification | AEC-Q101 qualified with PPAP support - suitable for Tier-1 automotive subsystems requiring traceable sourcing |
| Low clamping ratio | VC/VBR ≈ 1.39 (25 V / 18 V) - delivers tight overvoltage suppression critical for 3.3 V/5 V logic interfaces |
| Pb-free & RoHS compliant | Meets global environmental regulations and reflow compatibility standards for lead-free assembly |
Applications
| USB 2.0 Data Line Protection | I²C Bus Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 peripherals against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor with bidirectional clamping action. Use Value: Prevents latch-up or damage to USB transceivers by limiting voltage to ≤25 V during ±30 kV contact discharge. |
Use Scenario: Safeguarding SDA and SCL lines in embedded sensor networks exposed to board-level ESD. IC Role / Device Role / Timing Role: Common-anode Zener pair providing simultaneous low-capacitance protection. Use Value: Maintains signal integrity with <5 pF typical capacitance while meeting IEC 61000-4-2 Level 4 immunity. |
| Microcontroller GPIO Protection | Automotive Infotainment Interface |
|
Use Scenario: Shielding MCU GPIO pins connected to external buttons, LEDs, or analog sensors in consumer electronics. IC Role / Device Role / Timing Role: Dual Zener clamp referenced to system ground, absorbing fast transients before reaching I/O pads. Use Value: Enables reliable operation in noisy environments with <50 nA leakage preserving battery life in portable devices. |
Use Scenario: Protecting CAN/LIN auxiliary signal lines (e.g., display backlight control, audio mute) in automotive head units. IC Role / Device Role / Timing Role: AEC-Q101 qualified dual TVS for non-power signal lines requiring long-term reliability. Use Value: Supports 15-year automotive lifecycle with guaranteed performance across −40 °C to +125 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Zener TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF18AT1G | Single-line 18 V TVS in SOD-123; no dual-channel capability | Requires two devices for dual-line protection - increases PCB area and BOM count | Select when only one line needs protection or layout allows discrete placement |
| SZMMBZ18VALT1G | Identical electrical specs and pinout; automotive-grade marking prefix "SZ" and PPAP documentation included | Same function but certified for automotive production with full change control and lot traceability | Prefer for OEM automotive programs requiring AEC-Q101 documentation and PPAP submission support |
Compared with SMF18AT1G and SZMMBZ18VALT1G, the S2ZMMBZ18VALT1G offers integrated dual-line protection in minimal area, while SZMMBZ18VALT1G provides identical performance with enhanced automotive compliance documentation - making S2ZMMBZ18VALT1G optimal for cost-sensitive industrial designs where dual-channel integration is prioritized.
Availability
S2ZMMBZ18VALT1G is available at Aetrix Electronics and suitable for USB interface protection, I²C bus hardening, and microcontroller GPIO safeguarding requiring stable component supply and consistent parametric performance across production lots.
Supply support for S2ZMMBZ18VALT1G 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 MMBZxxxALT1G/SZMMBZxxxALT1G series targets compact, high-reliability transient protection for space-constrained digital interfaces - engineered specifically for ESD-hardened communication links and automotive signal conditioning.
FAQ
What is the Zener breakdown voltage tolerance for S2ZMMBZ18VALT1G?
The S2ZMMBZ18VALT1G has a nominal Zener breakdown voltage of 18 V with a tolerance of ±5%, specified as 17.1 V minimum to 18.9 V maximum at IT = 1.0 mA. This tight tolerance ensures predictable clamping behavior in precision voltage reference and overvoltage protection circuits where consistent trip thresholds are required.
Can S2ZMMBZ18VALT1G be used in bidirectional signal lines like RS-485 or CAN?
Yes, S2ZMMBZ18VALT1G supports bidirectional operation between pins 1 and 2 (cathodes), with pin 3 (common anode) grounded - enabling symmetric clamping for AC-coupled differential signals. While not a dedicated CAN bus protector, it provides effective secondary-level ESD suppression for auxiliary CAN-related control lines operating below 18 V.
Is S2ZMMBZ18VALT1G compatible with lead-free reflow soldering processes?
Yes, S2ZMMBZ18VALT1G is Pb-free and RoHS compliant, qualified for lead-free reflow with a maximum solder temperature of 260 °C for 10 seconds. Its thermosetting plastic package and corrosion-resistant finish ensure reliable wetting and joint integrity under standard J-STD-020 profile conditions.
What is the maximum clamping voltage of S2ZMMBZ18VALT1G under ESD stress?
The S2ZMMBZ18VALT1G clamps to a maximum of 25 V at 1.6 A peak pulse current (IPP), per the 1.0 ms rectangular waveform in Figure 6 of the datasheet. This value is measured under unidirectional configuration (pins 1–3 or 2–3) and ensures downstream 3.3 V or 5 V logic remains within safe operating limits during IEC 61000-4-2 Level 4 events.
Does S2ZMMBZ18VALT1G meet automotive qualification standards?
No - S2ZMMBZ18VALT1G is part of the commercial MMBZxxxALT1G series. For automotive use, the functionally identical SZMMBZ18VALT1G variant is AEC-Q101 qualified and PPAP capable. The "SZ" prefix denotes automotive-specific process controls, extended testing, and full documentation required for Tier-1 vehicle programs.
S2ZMMBZ18VALT1G 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:
- -
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
S2ZMMBZ18VALT1G FAQ
1.How can I place an order for S2ZMMBZ18VALT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for S2ZMMBZ18VALT1G 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 S2ZMMBZ18VALT1G reliable?
The price and inventory of S2ZMMBZ18VALT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2ZMMBZ18VALT1G is usually 5 days.
3.What payment methods are accepted for S2ZMMBZ18VALT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2ZMMBZ18VALT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2ZMMBZ18VALT1G?
S2ZMMBZ18VALT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2ZMMBZ18VALT1G 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 S2ZMMBZ18VALT1G?
For technical support, including S2ZMMBZ18VALT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2ZMMBZ18VALT1G requirements.
6.How does Aetrix verify that S2ZMMBZ18VALT1G is sourced from the original manufacturer or authorized distributors?
All S2ZMMBZ18VALT1G 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 S2ZMMBZ18VALT1G meets industry standards.
7.What is the process for return or replacement of S2ZMMBZ18VALT1G?
All S2ZMMBZ18VALT1G units undergo pre-shipment inspection (PSI). If there is an issue with S2ZMMBZ18VALT1G, 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 S2ZMMBZ18VALT1G part is unused and in its original packaging.
Return procedure for S2ZMMBZ18VALT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
S2ZMMBZ18VALT1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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