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onsemi SZMMBZ27VCLT1G
- Part No.:
- SZMMBZ27VCLT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ27VCLT1G.pdf
- Description:
- TVS DIODE 22VWM 38VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,460
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Product details
Overview
SZMMBZ27VCLT1G from onsemi is a dual common-cathode Zener diode array in SOT-23 package, designed for bidirectional ESD and transient voltage protection of two signal lines. It features 27 V nominal breakdown voltage (25.65–28.35 V at 1 mA), 40 W peak pulse power (1 ms), <50 nA reverse leakage at 22 V, and IEC61000-4-2 Level 4 (±30 kV contact) ESD rating - deployed in automotive Single-Wire CAN networks and medical equipment interfaces.
For engineers reviewing the SZMMBZ27VCLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (38 V @ 1.0 A), unidirectional/bidirectional configuration flexibility, AEC-Q101 qualification, and dual-line protection in space-constrained PCB layouts.
Technical Context
This device integrates two monolithic silicon Zener junctions sharing a common cathode (Pin 3), enabling either independent unidirectional protection (Pins 1–3 and Pins 2–3) or combined bidirectional protection (Pins 1–2). Its thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting stable operation from −55 °C to +150 °C junction temperature.
The 27 V nominal Zener voltage exhibits a typical temperature coefficient of ±12 mV/°C, with clamping voltage tightly specified at 38 V under 1.0 A peak pulse current (Figure 5 waveform). It meets Class 3B HBM ESD rating (>16 kV) and UL 94 V-0 flammability standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 25.65–28.35 V @ 1 mA - defines precise overvoltage threshold for line protection |
| Clamping Voltage | 38 V @ 1.0 A peak pulse - limits transient voltage seen by downstream ICs |
| Peak Pulse Power | 40 W @ 1.0 ms - handles high-energy ESD and surge events per IEC61000-4-2 |
| ESD Rating | ±30 kV contact discharge (IEC61000-4-2 Level 4) - exceeds automotive and industrial immunity requirements |
| Reverse Leakage | <50 nA @ 22 V - ensures minimal standby current in high-impedance signal paths |
| Package | SOT-23 (Case 318, Style 9) - 2.90 × 1.30 × 1.00 mm surface-mount footprint for dense routing |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability and temperature cycling performance |
Pinout & Package
SOT-23 package (Case 318, Style 9) with void-free thermosetting plastic body, Pb-free finish, and UL 94 V-0 flammability rating. Maximum soldering temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | First protected line input - connects to signal trace requiring clamping to cathode rail |
| Pin 2 | Anode 2 | Second protected line input - enables dual-line protection without extra components |
| Pin 3 | Cathode (common) | Shared reference node - ties both Zeners to ground or bias rail for unidirectional or bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Reduces component count and PCB area by protecting two lines in one SOT-23 package |
| Bidirectional configuration support | Enables symmetric ±27 V clamping across Pins 1–2 when used as a single transient suppressor |
| AEC-Q101 qualification | Validates suitability for automotive ECUs including Single-Wire CAN bus nodes |
| Low leakage & tight VZ tolerance | <50 nA IR and ±5% VZ spread ensure predictable turn-on and minimal signal distortion |
| Pb-free and RoHS compliant | Meets global environmental compliance mandates without sacrificing electrical performance |
Applications
| Automotive Single-Wire CAN | Medical Equipment Interface |
|---|---|
Use Scenario: Protection of SW-CAN bus lines against ESD and load-dump transients in vehicle ECUs and diagnostic connectors. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between CAN-H and chassis ground, referenced to DLC connector pins. Use Value: Clamps surges to ≤38 V while maintaining signal integrity via low capacitance and fast response (<1 ns). | Use Scenario: Safeguarding analog sensor inputs and digital communication ports (e.g., RS-232, USB) in portable diagnostic devices. IC Role / Device Role / Timing Role: Front-end ESD clamp on patient-connected signal paths and external interface connectors. Use Value: Prevents latch-up or damage in precision front-end amplifiers with <50 nA leakage and ±30 kV contact ESD immunity. |
| Industrial Printer Port | Business Machine Data Line |
Use Scenario: Surge suppression on parallel/USB printer cables exposed to handling-induced ESD in office environments. IC Role / Device Role / Timing Role: Dual-line protector on bidirectional data and strobe lines connecting controller to print head. Use Value: Eliminates need for two discrete Zeners - saves 1.5 mm² board area and simplifies layout verification. | Use Scenario: Protecting keyboard matrix scan lines and display interface buses in POS terminals and ATMs. IC Role / Device Role / Timing Role: Common-cathode Zener pair guarding multiple low-voltage I/O lines against accidental contact discharge. Use Value: Achieves Class 3B HBM (>16 kV) and IEC61000-4-2 Level 4 compliance in compact, cost-sensitive designs. |
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 |
|---|---|---|---|
| SZMMBZ27VCW1T1G | Same electrical specs but W1 suffix indicates different tape-and-reel packaging (10,000 pcs/reel vs. 3,000 pcs/reel); identical SOT-23 pinout and thermal performance | Optimized for high-volume automated assembly where reel size impacts changeover frequency | Select when production volume justifies larger reels and feeder compatibility is confirmed |
| SMF27A | Single-line 27 V TVS diode in SOD-123; no dual-anode topology - requires two devices for same function; higher clamping voltage (41.5 V @ 1 A) | Lacks integrated dual-line capability; suited for discrete line-by-line protection where layout allows extra footprint | Choose only if dual-line integration is unnecessary and existing design uses SOD-123 footprints |
Compared with SZMMBZ27VCLT1G, SZMMBZ27VCW1T1G offers identical protection performance with optimized logistics, while SMF27A provides lower-cost single-line protection at the expense of board area and component count - making SZMMBZ27VCLT1G optimal for space-constrained dual-signal applications.
Availability
SZMMBZ27VCLT1G is available at Aetrix Electronics and suitable for automotive ECUs, medical diagnostics interfaces, and industrial printer port protection requiring stable component supply and AEC-Q101-compliant transient suppression.
Supply support for SZMMBZ27VCLT1G 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 focused on energy-efficient electronics, delivering power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
SZMMBZ27VCLT1G belongs to the MMBZ/SZMMBZxxVxL series - a family of dual Zener diodes engineered specifically for compact, high-reliability ESD and surge protection in safety-critical and space-constrained systems.
FAQ
What is the exact Zener breakdown voltage range for SZMMBZ27VCLT1G?
The SZMMBZ27VCLT1G has a guaranteed breakdown voltage range of 25.65 V to 28.35 V at test current IT = 1.0 mA, measured at 25 °C ambient temperature. This ±5% tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage threshold setting in protected circuits.
Is SZMMBZ27VCLT1G qualified for automotive applications?
Yes, SZMMBZ27VCLT1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. It operates reliably from −55 °C to +150 °C and meets stringent automotive ESD and thermal cycling standards.
How does the dual common-cathode configuration of SZMMBZ27VCLT1G improve PCB layout?
The dual common-cathode configuration of SZMMBZ27VCLT1G allows protection of two independent signal lines using a single SOT-23 footprint - reducing component count by 50%, saving ~1.5 mm² board area, and eliminating routing complexity associated with two discrete Zeners. Pin 3 serves as shared cathode reference for both anodes (Pins 1 and 2).
What is the clamping voltage of SZMMBZ27VCLT1G under surge conditions?
The clamping voltage of SZMMBZ27VCLT1G is 38 V maximum at 1.0 A peak pulse current (per Figure 5 waveform, 1.0 ms pulse width). This value represents the maximum voltage imposed on protected circuitry during standardized ESD and surge events, ensuring downstream ICs remain within safe operating limits.
Does SZMMBZ27VCLT1G support bidirectional transient suppression?
Yes, SZMMBZ27VCLT1G supports bidirectional suppression when configured across Pins 1 and 2 (with Pin 3 floating or tied to a reference), forming a symmetrical ±27 V Zener pair. This enables balanced clamping for AC-coupled or differential signal lines without requiring external components.
SZMMBZ27VCLT1G 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):
- 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:
- -
- 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)
SZMMBZ27VCLT1G FAQ
1.How can I place an order for SZMMBZ27VCLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ27VCLT1G 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 SZMMBZ27VCLT1G reliable?
The price and inventory of SZMMBZ27VCLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ27VCLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ27VCLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ27VCLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ27VCLT1G?
SZMMBZ27VCLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ27VCLT1G 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 SZMMBZ27VCLT1G?
For technical support, including SZMMBZ27VCLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ27VCLT1G requirements.
6.How does Aetrix verify that SZMMBZ27VCLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ27VCLT1G 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 SZMMBZ27VCLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ27VCLT1G?
All SZMMBZ27VCLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ27VCLT1G, 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 SZMMBZ27VCLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ27VCLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ27VCLT1G 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
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
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D5V0L1B2WS-7
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