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onsemi SZMMBZ27VCWT3G
- Part No.:
- SZMMBZ27VCWT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZMMBZ27VCWT3G.pdf
- Description:
- 27V COM CATHODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:9,578
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Product details
Overview
SZMMBZ27VCWT3G from onsemi is a dual common-cathode Zener diode TVS device in SC−70 (SOT−323) package, rated for 40 W peak pulse power at 1.0 ms, 27 V nominal Zener breakdown voltage, and 22 V working peak reverse voltage, designed for bidirectional transient voltage suppression in automotive CAN bus and ESD-sensitive signal lines.
For engineers reviewing the SZMMBZ27VCWT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (38 V @ 1.0 A), low leakage (<100 nA @ 22 V), AEC−Q101 qualification, UL 94 V−0 flammability rating, and dual-line protection capability in a space-constrained SC−70 footprint.
Technical Context
This dual Zener TVS operates in bidirectional mode when pins 1 and 2 serve as anodes and pin 3 as shared cathode, enabling symmetrical clamping across two independent signal paths. Its design supports single-wire CAN transceiver protection per SAE J2411, with clamping response defined by the Figure 4 1.0 ms pulse waveform.
The device delivers 16 kV HBM ESD immunity and maintains stable breakdown voltage (±5% tolerance, 25.65–28.35 V at 1 mA) over −55°C to +150°C junction temperature range, with thermal resistance of 618°C/W enabling reliable operation on FR−5 PCBs without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 40 W @ 1.0 ms - defines maximum transient energy absorption without failure |
| Zener Breakdown Voltage | 27 V nominal (25.65–28.35 V @ 1 mA) - sets precise clamping threshold for overvoltage events |
| Working Peak Reverse Voltage | 22 V - maximum continuous reverse bias before significant leakage onset |
| Clamping Voltage | 38 V @ 1.0 A IPP - actual voltage seen by protected circuit during surge |
| ESD Rating (HBM) | Class N (>16 kV) - meets stringent electrostatic discharge immunity for automotive interfaces |
| Leakage Current | <100 nA @ 22 V - ensures minimal signal loading and power loss in standby |
| Package | SC−70 (SOT−323), 3-pin - enables dual-line protection in 2.2 × 1.35 × 1.0 mm footprint |
Pinout & Package
SC−70 (SOT−323) surface-mount package with void-free thermosetting plastic case, UL 94 V−0 rated, solderable at 260°C for 10 seconds. Pin configuration follows Style 5: Pin 1 = Anode, Pin 2 = Anode, Pin 3 = Cathode (dual common-cathode topology).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | First protected line input; forms unidirectional Zener path with Pin 3 |
| Pin 2 | Anode | Second protected line input; forms independent unidirectional Zener path with Pin 3 |
| Pin 3 | Cathode | Shared cathode node; enables dual-line protection with single-package integration |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode Zener topology | Protects two independent signal lines using one SC−70 package, reducing board area by ~50% vs discrete solutions |
| AEC−Q101 qualification | Validated for automotive underhood and ECU environments including thermal cycling, humidity, and mechanical shock |
| Bidirectional surge capability | Supports symmetric clamping for AC-coupled or bidirectional buses like single-wire CAN without external polarity reversal |
| Pb−free, Halogen Free/BFR Free | Complies with RoHS Directive 2011/65/EU and automotive material restrictions (e.g., IMDS, ELV) |
Applications
| Automotive Single-Wire CAN | USB Data Line Protection |
|---|---|
Use Scenario: Transient suppression on SAE J2411-compliant single-wire CAN bus in body control modules and door ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting bus voltage to ≤38 V during load dump or ESD events. Use Value: Prevents transceiver latch-up and data corruption while maintaining <100 nA leakage to avoid bus bias shift. | Use Scenario: ESD protection for USB 2.0 D+ and D− lines in portable medical devices and industrial dongles. IC Role / Device Role / Timing Role: Dual-line Zener clamp absorbing ±16 kV HBM surges before signal integrity degrades. Use Value: Enables robust hot-plug operation without signal distortion, leveraging matched breakdown voltage tolerance (±5%). |
| Industrial Sensor Interface | POS Terminal Keypad Lines |
Use Scenario: Overvoltage protection for 4–20 mA current-loop sensor inputs exposed to field wiring transients. IC Role / Device Role / Timing Role: Unidirectional Zener clamp (Pins 1–3 or 2–3) shunting surges above 22 V working voltage. Use Value: Maintains loop accuracy with <100 nA leakage, avoiding offset errors in precision analog front-ends. | Use Scenario: ESD hardening of membrane keypad matrix rows/columns in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Dual-anode configuration protects up to two keypad scan lines simultaneously. Use Value: Reduces BOM count by 50% versus single-diode solutions while preserving UL 94 V−0 flame resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ27VCWT3G | No AEC−Q101 qualification; identical electrical specs and SC−70 package | Not approved for automotive production; suitable for industrial/commercial use only | Select when automotive qualification is not required and cost sensitivity is higher |
| SZMMBZ27VCWT1G | Same AEC−Q101 qualification and electrical specs; differs only in tape-and-reel quantity (3,000 vs 10,000 units) | Identical functional performance; used where smaller reel size aligns with SMT line setup | Select when production volume or feeder compatibility favors 3k reels |
Compared with MMBZ27VCWT3G, SZMMBZ27VCWT3G adds automotive qualification without altering clamping behavior or footprint; compared with SZMMBZ27VCWT1G, it offers identical protection performance in a higher-volume reel format for large-scale manufacturing.
Availability
SZMMBZ27VCWT3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and medical device USB port hardening requiring stable component supply and long-term lifecycle support.
Supply support for SZMMBZ27VCWT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
SZMMBZ27VCWT3G belongs to the MMBZ27VCW family of dual Zener TVS diodes, engineered specifically for space-constrained, high-reliability transient suppression in automotive communication networks and ESD-vulnerable I/O interfaces.
FAQ
What is the clamping voltage of SZMMBZ27VCWT3G and under what test condition is it specified?
The clamping voltage of SZMMBZ27VCWT3G is 38 V, measured at a peak pulse current (IPP) of 1.0 A using the 1.0 ms exponential waveform defined in Figure 4 of the datasheet. This value represents the maximum voltage imposed on the protected line during a transient event and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The 38 V clamping occurs consistently across the full operating temperature range.
Is SZMMBZ27VCWT3G suitable for bidirectional signal lines such as CAN or USB?
Yes, SZMMBZ27VCWT3G supports bidirectional protection via its dual common-cathode configuration: connecting Pins 1 and 2 to separate signal lines and Pin 3 to ground creates two symmetrical Zener paths. This architecture is explicitly validated for SAE J2411 single-wire CAN and USB 2.0 data lines, delivering matched ±38 V clamping without polarity-dependent layout constraints.
Does SZMMBZ27VCWT3G meet automotive qualification standards?
Yes, SZMMBZ27VCWT3G is AEC−Q101 qualified and PPAP capable, confirming compliance with stress tests including temperature cycling, high-temperature operating life, and ESD robustness required for automotive electronic control units. The "SZ" prefix denotes automotive-grade traceability, site control, and change management per customer requirements.
What is the maximum leakage current of SZMMBZ27VCWT3G and at what voltage is it measured?
The maximum reverse leakage current of SZMMBZ27VCWT3G is 100 nA, measured at the working peak reverse voltage (VRWM) of 22 V and ambient temperature of 25°C. This ultra-low leakage ensures minimal impact on high-impedance signal paths such as sensor interfaces or battery-powered keypad matrices, preserving system accuracy and standby power budget.
How does the SC−70 package of SZMMBZ27VCWT3G support high-density PCB layouts?
The SC−70 (SOT−323) package of SZMMBZ27VCWT3G measures 2.2 mm × 1.35 mm × 1.0 mm and integrates dual Zener protection into a single footprint-replacing two discrete SOD-323 devices and saving ~35% board area. Its standardized pinout (Style 5) and Pb−free finish ensure compatibility with standard reflow profiles and automated optical inspection systems.
SZMMBZ27VCWT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- 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:
- 38V
- Current - Peak Pulse (10/1000µs):
- 1A
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- CAN
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
SZMMBZ27VCWT3G FAQ
1.How can I place an order for SZMMBZ27VCWT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ27VCWT3G 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 SZMMBZ27VCWT3G reliable?
The price and inventory of SZMMBZ27VCWT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ27VCWT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ27VCWT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ27VCWT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ27VCWT3G?
SZMMBZ27VCWT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ27VCWT3G 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 SZMMBZ27VCWT3G?
For technical support, including SZMMBZ27VCWT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ27VCWT3G requirements.
6.How does Aetrix verify that SZMMBZ27VCWT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ27VCWT3G 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 SZMMBZ27VCWT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ27VCWT3G?
All SZMMBZ27VCWT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ27VCWT3G, 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 SZMMBZ27VCWT3G part is unused and in its original packaging.
Return procedure for SZMMBZ27VCWT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ27VCWT3G Tags
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ESD9B5.0ST5G
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ESD5Z3.3T1G
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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