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onsemi SZMMBZ15VALT3G
- Part No.:
- SZMMBZ15VALT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ15VALT3G.pdf
- Description:
- TVS DIODE 12VWM 21VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,872
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Product details
Overview
SZMMBZ15VALT3G 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 15 V nominal Zener breakdown voltage (±5%), 40 W peak pulse power at 1.0 ms, clamping voltage of 21 V at 1.9 A peak pulse current, and AEC-Q101 qualification for automotive applications.
For engineers reviewing the SZMMBZ15VALT3G 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 at 12 V), and space-saving dual-cathode/common-anode topology for high-density PCB layouts.
Technical Context
This device implements a monolithic dual-junction Zener structure with shared anode (Pin 3) and isolated cathodes (Pins 1 and 2), enabling either two independent unidirectional clamps or one bidirectional clamp per line. Its thermal resistance junction-to-ambient is 417 °C/W on alumina substrate, supporting sustained operation up to +150 °C junction temperature.
The 40 W peak power rating applies under the non-repetitive 1.0 ms rectangular waveform per Figure 6, with derating above 25 °C ambient per Figure 7. Clamping performance is specified at 1.9 A peak pulse current, delivering 21 V maximum clamping voltage - critical for protecting 12–15 V logic interfaces without overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 14.25–15.75 V @ 1.0 mA test current - ensures precise voltage clamping for 12 V rail protection |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - handles high-energy transients like ISO 7637-2 pulse 1/2a in automotive ECUs |
| Clamping Voltage (VC) | 21 V @ IPP = 1.9 A - guarantees safe voltage ceiling during ESD events per IEC 61000-4-2 |
| ESD Rating | ±30 kV contact discharge (IEC 61000-4-2 Level 4) - exceeds industrial and automotive immunity requirements |
| Leakage Current (IR) | <50 nA @ 12 V reverse bias - prevents signal loading on high-impedance sensor or communication lines |
| Package | SOT-23 (Case 318, Style 12) - surface-mount footprint measuring 2.90 × 1.30 × 1.00 mm for ultra-compact layout |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and infotainment applications requiring PPAP compliance |
Pinout & Package
SOT-23 package (Case 318, Style 12) with gull-wing leads; void-free thermosetting plastic case rated UL 94 V-0; maximum solder temperature 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line - connects to signal trace requiring clamping to common anode (Pin 3) |
| Pin 2 | Cathode 2 | Second protected line - enables dual-line ESD protection without discrete components |
| Pin 3 | Anode (Common) | Shared reference node - typically tied to ground or supply rail depending on unidirectional/bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode Zener topology | Enables two independent unidirectional clamps or one bidirectional clamp per line - reduces component count by 50% vs. discrete diodes |
| 40 W peak pulse power | Withstands high-energy transients such as load dump surges in 12 V automotive systems without degradation |
| IEC 61000-4-2 Level 4 ESD rating | ±30 kV contact discharge - eliminates need for external ESD suppressors in USB, CAN, LIN, and sensor interfaces |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock - supports PPAP documentation |
| Pb-free and RoHS compliant | Meets global environmental regulations and lead-free reflow soldering profiles (J-STD-020) |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Transceiver Clamp |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor - clamps both signal and return path relative to chassis ground. Use Value: Prevents latch-up or damage to 12-bit ADC inputs while maintaining <50 nA leakage to avoid offset errors. |
Use Scenario: Safeguarding RS-485 differential bus lines (A/B) against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Bidirectional clamping device - Pins 1 & 2 protect A and B lines, Pin 3 tied to local ground. Use Value: Limits bus voltage excursion to ≤21 V during 1.9 A surge, preserving transceiver integrity without adding propagation delay. |
| USB 2.0 Data Line ESD Suppression | Medical Patient Monitor Signal Conditioning |
|
Use Scenario: Adding IEC 61000-4-2 Level 4 ESD protection to D+ and D− lines in portable diagnostic devices. IC Role / Device Role / Timing Role: Dual unidirectional Zener clamp - each cathode protects one data line referenced to common ground. Use Value: Achieves <0.3 pF typical capacitance per line (per Fig. 3), avoiding signal integrity loss at 480 Mbps full-speed USB. |
Use Scenario: Shielding ECG electrode inputs and analog front-end amplifiers from electrostatic discharge in hospital-grade monitors. IC Role / Device Role / Timing Role: Low-leakage transient suppressor - isolates high-impedance biopotential nodes from transient coupling paths. Use Value: Maintains input bias current integrity with <50 nA leakage at 12 V, preventing baseline drift in sub-mV physiological measurements. |
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 |
|---|---|---|---|
| SZMMBZ15VAWT3G | Same Zener voltage and package, but 2% tolerance (vs. 5%) and tighter VBR spread (14.7–15.3 V) | Better suited for precision clamping where ±0.3 V variation is unacceptable, e.g., regulated 15 V supply monitoring | Select when tighter voltage matching across production lots is required; otherwise SZMMBZ15VALT3G offers optimal cost/performance balance |
| SMF15AT1G | Single-channel TVS diode, same 15 V VBR, but higher 200 W peak power and lower 24.4 V clamping at 12.3 A | Requires two devices for dual-line protection; better for high-current surges but increases board area and BOM count | Choose only if system-level testing confirms >1.9 A surge currents - otherwise SZMMBZ15VALT3G provides superior integration and layout efficiency |
Compared with SZMMBZ15VAWT3G, SZMMBZ15VALT3G trades tighter voltage tolerance for broader availability and lower unit cost; versus SMF15AT1G, it delivers dual-line protection in half the footprint and simplifies routing, though with lower single-pulse energy handling.
Availability
SZMMBZ15VALT3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial fieldbus interface development, and medical device signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SZMMBZ15VALT3G 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 specializing in energy-efficient technologies for automotive, industrial, cloud, and medical applications, with manufacturing sites across Asia, North America, and Europe.
The MMBZ/SZMMBZxxxALT1G series targets compact, high-reliability transient suppression in space-constrained systems - specifically engineered for dual-line ESD and surge protection in automotive and industrial electronics.
FAQ
What is the Zener breakdown voltage tolerance for SZMMBZ15VALT3G?
The SZMMBZ15VALT3G has a nominal Zener breakdown voltage of 15 V with a ±5% tolerance, meaning the actual VBR falls between 14.25 V and 15.75 V when measured at 1.0 mA test current. This tolerance aligns with standard industrial and automotive grade specifications and is verified per the onsemi datasheet revision 22, page 3.
How is the SZMMBZ15VALT3G configured for bidirectional ESD protection?
The SZMMBZ15VALT3G is configured for bidirectional protection by connecting Pin 3 (common anode) to ground and using Pins 1 and 2 as protected signal lines - each cathode forms a unidirectional clamp to ground, collectively enabling bidirectional clamping behavior. This configuration is explicitly supported in the datasheet's Typical Common Anode Applications section (page 6).
Is SZMMBZ15VALT3G qualified for automotive applications?
Yes, SZMMBZ15VALT3G is AEC-Q101 qualified and PPAP capable, as confirmed in the datasheet's Features section and Ordering Information table. The "SZ" prefix denotes automotive-grade screening, including stress testing for temperature cycling, humidity, and mechanical robustness required for under-hood and cabin electronics.
What is the maximum clamping voltage of SZMMBZ15VALT3G during an ESD event?
The maximum clamping voltage (VC) of SZMMBZ15VALT3G is 21 V at a peak pulse current (IPP) of 1.9 A, per the Electrical Characteristics table on page 3 of the datasheet. This value is measured under the 1.0 ms rectangular waveform defined in Figure 6 and ensures safe voltage limiting for 12 V interface circuits.
Can SZMMBZ15VALT3G replace discrete Zener diodes in existing designs?
Yes, SZMMBZ15VALT3G can replace two discrete 15 V Zener diodes in common-anode configurations - its Pin 1/Cathode 1 and Pin 2/Cathode 2 provide independent clamping paths, while Pin 3/Anode serves as the shared reference. Layout adaptation is minimal, requiring only routing adjustment to accommodate the SOT-23 footprint and dual-cathode topology.
SZMMBZ15VALT3G 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):
- 12V
- Voltage - Breakdown (Min):
- 14.25V
- Voltage - Clamping (Max) @ Ipp:
- 21V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- 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)
SZMMBZ15VALT3G FAQ
1.How can I place an order for SZMMBZ15VALT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ15VALT3G 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 SZMMBZ15VALT3G reliable?
The price and inventory of SZMMBZ15VALT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ15VALT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ15VALT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ15VALT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ15VALT3G?
SZMMBZ15VALT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ15VALT3G 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 SZMMBZ15VALT3G?
For technical support, including SZMMBZ15VALT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ15VALT3G requirements.
6.How does Aetrix verify that SZMMBZ15VALT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ15VALT3G 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 SZMMBZ15VALT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ15VALT3G?
All SZMMBZ15VALT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ15VALT3G, 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 SZMMBZ15VALT3G part is unused and in its original packaging.
Return procedure for SZMMBZ15VALT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ15VALT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
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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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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