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onsemi MMBZ27VCWT3G
- Part No.:
- MMBZ27VCWT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ27VCWT3G.pdf
- Description:
- SC-70 3 EUT SNGL CPR PBF
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MMBZ27VCWT3G 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. It provides bidirectional transient voltage suppression and ESD protection exceeding 16 kV per HBM, designed for space-constrained I/O line protection in automotive CAN networks and industrial interfaces.
For engineers reviewing the MMBZ27VCWT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (38 V @ 1.0 A), low leakage (<100 nA @ 22 V), thermal resistance (618 °C/W), and dual-line protection capability in a single 3-pin surface-mount package.
Technical Context
The MMBZ27VCWT3G integrates two monolithic Zener junctions sharing a common cathode (Pins 1 & 2 = anodes, Pin 3 = cathode), enabling either dual unidirectional or single bidirectional configuration. Its 27 V nominal breakdown voltage is specified at 1 mA test current with ±5% tolerance (25.65–28.35 V) and exhibits a positive temperature coefficient of ≤26 mV/°C.
It delivers 38 V clamping voltage at 1.0 A peak pulse current under the Figure 4 1.0 ms waveform, with steady-state power dissipation limited to 200 mW on FR-5 board and derating above 25°C at 1.6 mW/°C. Junction temperature range spans −55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 27 V nominal (25.65–28.35 V min/max @ 1 mA); defines precise DC voltage threshold for conduction onset. |
| Working Peak Reverse Voltage (VRWM) | 22 V maximum; safe continuous operating voltage before significant leakage or clamping begins. |
| Clamping Voltage (VC) | 38 V @ 1.0 A IPP; maximum voltage seen by protected circuit during transient event. |
| Peak Pulse Power (PPk) | 40 W @ 1.0 ms; surge energy handling capacity per IEC 61000-4-5 waveform compliance. |
| ESD Rating (HBM) | >16 kV; meets Class N ESD immunity for robust interface port protection. |
| Leakage Current (IR) | <100 nA @ 22 V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Package | SC−70 (SOT−323); 3-pin, 1.25 mm × 2.1 mm footprint ideal for dense PCB layouts. |
Pinout & Package
SC−70 (SOT−323) package: void-free thermosetting plastic case, Pb-free/RoHS-compliant, UL 94 V−0 flammability rating, solderable at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode of Zener Diode 1 | Connects to first protected line (e.g., CAN-H or data line A); enables independent or shared cathode routing. |
| Pin 2 | Anode of Zener Diode 2 | Connects to second protected line (e.g., CAN-L or data line B); dual-anode/common-cathode topology saves board area. |
| Pin 3 | Common Cathode | Shared return path to ground or reference; critical for bidirectional clamping when both anodes are used. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Zener Junctions in One Package | Protects two signal lines (e.g., differential CAN bus) with single SC−70 footprint-reduces component count and layout area by 50% vs. discrete diodes. |
| Bidirectional Transient Suppression | Configurable as single bidirectional TVS via Pins 1+3 or 2+3; clamps both positive and negative transients without external polarity reversal. |
| High ESD Robustness | Class N rating (>16 kV HBM) ensures reliable protection against human-body discharge events in connector-facing circuits. |
| Low-Leakage Zener Operation | <100 nA reverse leakage at 22 V enables use in battery-powered or high-impedance sensor interfaces without signal degradation. |
| AEC−Q101 Qualified Variant Available | SZ prefix versions (e.g., SZMMBZ27VCWT3G) support automotive applications requiring PPAP documentation and site-specific control. |
Applications
| Automotive Single-Wire CAN Bus Protection | Industrial RS-485 Interface Protection |
|---|---|
Use Scenario: Protecting ECU-level single-wire CAN transceivers (per SAE J2411) from load-dump-induced transients and ESD at vehicle harness connectors. IC Role / Device Role / Timing Role: Dual-line TVS clamp placed between bus line and ground, leveraging common-cathode architecture to suppress both polarities on CAN-H and CAN-L simultaneously. Use Value: Maintains signal integrity below 38 V clamping level during 1.0 A surges while occupying <2.6 mm² PCB area-critical for compact ECU modules. | Use Scenario: Safeguarding RS-485 transceiver I/O pins in factory automation controllers exposed to cable-induced surges and field ESD. IC Role / Device Role / Timing Role: Unidirectional Zener clamp on each differential line (A/B), using Pins 1+3 and 2+3 independently to limit voltage excursions during lightning-induced ring waves. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (1 kV line-to-ground) with no additional passive components beyond 220 pF decoupling capacitor. |
| Medical Equipment ESD-Sensitive Ports | Point-of-Sale Terminal Keypad Interfaces |
Use Scenario: Shielding USB, UART, or analog sensor inputs on diagnostic imaging devices from operator-handling ESD events in clinical environments. IC Role / Device Role / Timing Role: Bidirectional TVS configured across signal and ground using one MMBZ27VCWT3G per port, exploiting 16 kV HBM rating for regulatory pass/fail margin. Use Value: Eliminates need for separate TVS diodes per line while maintaining <100 nA leakage-preserving accuracy of microvolt-level biomedical signal paths. | Use Scenario: Protecting membrane keypad scan lines in retail terminals subjected to repeated electrostatic discharge from customer interaction. IC Role / Device Role / Timing Role: Dual unidirectional Zener configuration (Pin 1+3 and Pin 2+3) clamping each row/column line to ground, preventing latch-up in microcontroller GPIOs. Use Value: Achieves >100,000 insertion cycles reliability with no performance drift due to stable 27 V breakdown and <26 mV/°C tempco over −40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P6SMB27CA | DO-214AA package (larger), 400 W peak power, 36.8 V clamping @ 10.5 A, unidirectional dual-channel variant only. | Used where higher surge energy (IEC 61000-4-5 Level 4) is required; not suitable for space-constrained designs. | Select P6SMB27CA only when board area permits larger package and clamping voltage margin >36 V is acceptable. |
| ESD9L27ST5G | SOD-923 package (smaller), 12 W peak power, 38 V clamping @ 1.0 A, single-line configuration; lower power rating but same clamping voltage. | Preferred for ultra-dense portable electronics where dual-line integration is unnecessary and 12 W surge capacity suffices. | Choose ESD9L27ST5G when protecting individual lines separately and minimizing footprint is prioritized over dual-line consolidation. |
Compared with P6SMB27CA and ESD9L27ST5G, the MMBZ27VCWT3G uniquely balances dual-line protection, 40 W surge capability, and SC−70 compactness-making it optimal for automotive and industrial interfaces needing both space efficiency and robust 1.0 ms transient suppression.
Availability
MMBZ27VCWT3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial communication interface development, and medical equipment I/O protection requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ27VCWT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ27VCW series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for high-reliability, space-constrained overvoltage protection in automotive and industrial serial bus systems.
FAQ
What is the exact pin configuration of the MMBZ27VCWT3G?
The MMBZ27VCWT3G uses SC−70 (SOT−323) package with Pin 1 = Anode 1, Pin 2 = Anode 2, Pin 3 = Common Cathode. This dual-anode/common-cathode arrangement allows either two independent unidirectional clamps or one bidirectional device. The marking "AC" on the top surface identifies the device code, and the "G" suffix confirms Pb-free compliance.
Does the MMBZ27VCWT3G support bidirectional transient suppression?
Yes, the MMBZ27VCWT3G supports bidirectional suppression by connecting both anodes (Pins 1 and 2) to the protected line and the common cathode (Pin 3) to ground. This configuration leverages the inherent symmetry of dual Zener junctions to clamp both positive and negative transients without external components-verified in onsemi's Figure 6 CAN protection schematic.
What is the clamping voltage of the MMBZ27VCWT3G at its rated peak pulse current?
The MMBZ27VCWT3G has a clamping voltage of 38 V at 1.0 A peak pulse current (IPP), measured using the 1.0 ms exponential waveform defined in Figure 4 of the datasheet. This value ensures protected circuits remain below critical voltage thresholds during standardized surge events such as IEC 61000-4-5.
Is the MMBZ27VCWT3G qualified for automotive applications?
The base MMBZ27VCWT3G is not AEC−Q101 qualified, but its automotive-grade variant SZMMBZ27VCWT3G is fully AEC−Q101 qualified and PPAP capable. Both share identical electrical specs and SC−70 packaging; only the SZ prefix indicates automotive qualification, traceability, and extended process controls required for vehicle systems.
How does the MMBZ27VCWT3G compare to single-Zener TVS diodes in terms of board space?
The MMBZ27VCWT3G occupies just 2.6 mm² (1.25 mm × 2.1 mm) in SC−70 package while protecting two lines-equivalent to ~50% less area than two discrete SOD-323 Zeners. Its dual-junction design eliminates inter-component routing, reduces solder joints, and improves layout repeatability in high-volume manufacturing of compact modules like CAN ECUs.
MMBZ27VCWT3G 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
MMBZ27VCWT3G FAQ
1.How can I place an order for MMBZ27VCWT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ27VCWT3G 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 MMBZ27VCWT3G reliable?
The price and inventory of MMBZ27VCWT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ27VCWT3G is usually 5 days.
3.What payment methods are accepted for MMBZ27VCWT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ27VCWT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ27VCWT3G?
MMBZ27VCWT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ27VCWT3G 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 MMBZ27VCWT3G?
For technical support, including MMBZ27VCWT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ27VCWT3G requirements.
6.How does Aetrix verify that MMBZ27VCWT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ27VCWT3G 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 MMBZ27VCWT3G meets industry standards.
7.What is the process for return or replacement of MMBZ27VCWT3G?
All MMBZ27VCWT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ27VCWT3G, 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 MMBZ27VCWT3G part is unused and in its original packaging.
Return procedure for MMBZ27VCWT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ27VCWT3G 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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