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onsemi MMBZ27VCLT1
- Part No.:
- MMBZ27VCLT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ27VCLT1.pdf
- Description:
- TVS DIODE 22VWM 38VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,865
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Product details
Overview
MMBZ27VCLT1 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 a nominal breakdown voltage of 27 V, 40 W peak pulse power (1.0 ms), <50 nA reverse leakage at 22 V, ±30 kV IEC61000-4-2 contact ESD rating, and UL 94 V-0 flammability compliance - deployed in automotive single-wire CAN networks and industrial I/O interfaces.
For engineers reviewing the MMBZ27VCLT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, dual-zener circuit role clarification, SOT-23 terminal mapping, real-world ESD protection use cases, and validated alternative parts for board-level surge suppression design.
Technical Context
This device integrates two monolithic Zener junctions sharing a common cathode (Pin 3), enabling either independent unidirectional clamping (Pins 1–3 and 2–3) or combined bidirectional protection (Pins 1–2). Its 27 V nominal breakdown is specified at 1.0 mA test current with ±0.35 V tolerance (25.65–28.35 V), and exhibits a temperature coefficient of ±12 mV/°C.
The 40 W peak pulse power is defined per Figure 5's 1.0 ms exponential waveform, derated linearly above 25 °C per Figure 6. Thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting reliable operation from −55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 25.65–28.35 V @ 1.0 mA - defines precise clamping threshold for overvoltage events in 24 V systems. |
| Peak Pulse Power | 40 W @ 1.0 ms - sustains high-energy transients like ISO 7637-2 pulses without failure. |
| Clamping Voltage (VC) | 38 V @ 1.0 A peak - ensures downstream ICs see limited voltage during ESD strikes. |
| ESD Rating | ±30 kV contact discharge (IEC61000-4-2 Level 4) - exceeds automotive and industrial immunity requirements. |
| Reverse Leakage | <50 nA @ 22 V - minimizes standby current in always-on sensor or bus lines. |
| Package | SOT-23 (Case 318, Style 9) - enables compact dual-line protection with 2.9 × 1.3 mm footprint. |
Pinout & Package
SOT-23 package (Case 318, Style 9) with void-free thermosetting plastic case, Pb-free finish, and 260 °C soldering tolerance (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | First Zener anode - connects to protected line 1 in unidirectional mode or forms one side of bidirectional clamp. |
| Pin 2 | Anode 2 | Second Zener anode - connects to protected line 2; paired with Pin 1 for differential or separate line protection. |
| Pin 3 | Cathode (Common) | Shared cathode node - ties both Zeners to ground or reference rail; enables dual-channel integration in one footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Reduces PCB area by 50% vs. two discrete SOT-23 Zeners while maintaining independent line protection capability. |
| Bidirectional configuration support | Enables symmetric ±27 V clamping across Pins 1–2 without external components - ideal for AC-coupled data lines. |
| Class 3B HBM ESD rating | Withstands >16 kV human-body-model discharges, eliminating need for supplemental ESD diodes in cost-sensitive designs. |
| UL 94 V-0 flammability | Meets safety standards for enclosed industrial equipment where flame propagation must be prevented under fault conditions. |
Applications
| Automotive Single-Wire CAN | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Transient suppression on single-wire CAN bus lines exposed to load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Dual-line bidirectional TVS protecting transceiver pins against ISO 16750-2 surges and IEC61000-4-2 ESD events. Use Value: Clamps bus voltage to ≤38 V during 1 A transients, preserving CAN signal integrity and preventing transceiver latch-up. |
Use Scenario: Input/output port protection in PLC modules handling 24 V digital signals subject to field wiring faults. IC Role / Device Role / Timing Role: Unidirectional Zener clamp on each I/O line (Pins 1–3 and 2–3) referenced to system ground. Use Value: Limits induced surges to safe levels while drawing <50 nA leakage - avoids false triggering of optocoupler inputs. |
| Medical Equipment Data Ports | Point-of-Sale Terminal Interfaces |
Use Scenario: ESD safeguarding of RS-232 or USB D+/D− lines in portable diagnostic devices. IC Role / Device Role / Timing Role: Bidirectional clamping element (Pins 1–2) placed before interface ICs to absorb ±8 kV contact discharges. Use Value: Achieves IEC61000-4-2 Level 4 compliance with single-device solution, reducing BOM count and layout complexity. |
Use Scenario: Protection of Ethernet PHY or serial communication lines in retail kiosks exposed to user-handling ESD. IC Role / Device Role / Timing Role: Common-cathode dual Zener guarding two independent signal paths (e.g., power + data) sharing ground return. Use Value: Maintains <100 nA leakage at 22 V working voltage - prevents battery drain in always-on payment terminals. |
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 |
|---|---|---|---|
| PESD5V0S1BA,115 (Nexperia) | Single-channel 5 V unidirectional TVS; lower clamping (12 V @ 1 A), no dual-anode topology. | Requires two devices for dual-line protection; unsuitable for 24 V systems due to low VBR. | Select when protecting 3.3/5 V logic lines with tighter clamping and higher ESD rating (±30 kV air). |
| SMAJ28A (Littelfuse) | Single-channel 28 V unidirectional TVS in SMA package; 400 W peak power but larger footprint (4.5 × 2.7 mm). | Lacks dual-line integration; used where higher energy handling is needed but board space allows discrete placement. | Choose for higher surge robustness in industrial power supply rails where SOT-23 density is not critical. |
Compared with PESD5V0S1BA,115 and SMAJ28A, the MMBZ27VCLT1 uniquely delivers dual 27 V Zener protection in SOT-23, balancing 24 V system compatibility, board-space efficiency, and certified ESD immunity - making it optimal for space-constrained dual-signal protection where 40 W pulse handling suffices.
Availability
MMBZ27VCLT1 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, and medical data port protection requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ27VCLT1 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.
The MMBZxxVxL series was engineered specifically for compact, high-reliability transient voltage suppression in space-constrained electronics - emphasizing dual-line integration, AEC-Q101 readiness, and certified ESD robustness.
FAQ
What is the exact breakdown voltage tolerance of MMBZ27VCLT1?
The MMBZ27VCLT1 has a guaranteed breakdown voltage range of 25.65 V to 28.35 V at 1.0 mA test current, corresponding to ±0.35 V deviation from the nominal 27 V rating. This tight tolerance ensures consistent clamping behavior across production lots and temperature ranges, critical for reliable overvoltage protection in 24 V automotive and industrial systems.
Can MMBZ27VCLT1 be used in bidirectional signal lines like RS-485?
Yes, MMBZ27VCLT1 supports bidirectional clamping when connected between Pins 1 and 2 - its dual common-cathode structure allows symmetric ±27 V protection without external components. This configuration is validated for transient suppression on balanced differential buses, provided the steady-state common-mode voltage remains within the 22 V working peak reverse voltage limit.
Is MMBZ27VCLT1 AEC-Q101 qualified?
No - only the SZMMBZ27VCLT1G variant carries AEC-Q101 qualification and PPAP capability. The MMBZ27VCLT1 is intended for industrial and commercial applications; its datasheet explicitly reserves automotive-grade certification for parts marked with the "SZ" prefix, which undergo additional stress testing and process controls.
What is the maximum clamping voltage of MMBZ27VCLT1 under surge conditions?
The MMBZ27VCLT1 clamps to a maximum of 38 V at 1.0 A peak pulse current (per Figure 5 waveform), measured at 25 °C ambient. This value increases slightly with temperature due to positive Zener temperature coefficient (+12 mV/°C), reaching ~39.2 V at 85 °C - still well below the 40 V absolute maximum rating of typical 24 V interface ICs.
Does MMBZ27VCLT1 require external current-limiting resistors?
No external resistor is required for ESD protection, as the device self-limits current during sub-microsecond events. However, for sustained overvoltage (e.g., load dump), a series impedance is recommended to limit average power dissipation within the 225 mW FR-5 board rating. The MMBZ27VCLT1's low leakage (<50 nA) eliminates DC bias concerns in high-impedance circuits.
MMBZ27VCLT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ27VCLT1 FAQ
1.How can I place an order for MMBZ27VCLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ27VCLT1 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 MMBZ27VCLT1 reliable?
The price and inventory of MMBZ27VCLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ27VCLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ27VCLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ27VCLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ27VCLT1?
MMBZ27VCLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ27VCLT1 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 MMBZ27VCLT1?
For technical support, including MMBZ27VCLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ27VCLT1 requirements.
6.How does Aetrix verify that MMBZ27VCLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ27VCLT1 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 MMBZ27VCLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ27VCLT1?
All MMBZ27VCLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ27VCLT1, 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 MMBZ27VCLT1 part is unused and in its original packaging.
Return procedure for MMBZ27VCLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ27VCLT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
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.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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