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onsemi MMBZ39VCLT3G
- Part No.:
- MMBZ39VCLT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ39VCLT3G.pdf
- Description:
- ZENER DIODE PROTECTION, COMMON C
- Quantity:
- Payment:
- Shipping:
Inventory:9,263
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Product details
Overview
MMBZ39VCLT3G from onsemi is a dual common-cathode 39 V Zener diode array in SOT-23 package, rated for 40 W peak pulse power (1.0 ms), 31.2 V working peak reverse voltage, and ±30 kV IEC61000-4-2 contact ESD protection - used for bidirectional transient suppression on data lines in automotive CAN networks and industrial I/O interfaces.
For engineers reviewing the MMBZ39VCLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage at 0.76 A (55 V), low leakage (<50 nA @ 31.2 V), dual-line protection capability in one footprint, and Pb-free SOT-23 packaging with UL 94 V-0 flammability rating.
Technical Context
This device integrates two monolithic Zener junctions sharing a common cathode (Pin 3), enabling either two independent unidirectional clamps (Pins 1–3 and 2–3) or a single bidirectional clamp (Pins 1–2). Its 39 V nominal breakdown voltage is specified at 1.0 mA test current with ±1.95 V tolerance (37.05–40.95 V).
The MMBZ39VCLT3G delivers 55 V clamping voltage at 0.76 A peak pulse current per IEC 61000-4-2 Level 4 surge waveform, with thermal resistance of 556 °C/W on FR-5 board and junction temperature range from −55 °C to +150 °C - supporting operation in harsh automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 37.05–40.95 V @ IT = 1.0 mA - defines precise DC regulation threshold for overvoltage cutoff |
| Clamping Voltage (VC) | 55 V @ IPP = 0.76 A - limits transient voltage during 30 kV ESD events to safe levels for downstream ICs |
| Working Peak Reverse Voltage (VRWM) | 31.2 V - maximum continuous reverse voltage before significant leakage or conduction begins |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - supports high-energy transients without failure under IEC 61000-4-5 surge conditions |
| ESD Rating | ±30 kV contact discharge (IEC61000-4-2 Level 4) - exceeds automotive and industrial immunity requirements |
| Leakage Current (IR) | <50 nA @ VRWM - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Package | SOT-23 (Case 318, Style 9) - 2.90 × 1.30 × 1.00 mm surface-mount footprint conserving PCB area |
Pinout & Package
SOT-23 package (Case 318, Style 9) with void-free thermosetting plastic case, Pb-free finish, and UL 94 V-0 flammability rating. Maximum solder temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | First Zener anode - connects to Line 1 for unidirectional clamping or forms one side of bidirectional path |
| Pin 2 | Anode 2 | Second Zener anode - connects to Line 2; enables dual-line protection or completes bidirectional configuration with Pin 1 |
| Pin 3 | Cathode (Common) | Shared cathode node - ties both Zeners to reference (e.g., ground or supply rail) for coordinated clamping action |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Protects two independent signal lines (e.g., CAN_H/CAN_L or RS-485 A/B) using single SOT-23 footprint |
| Bidirectional transient suppression | Configurable as single ±39 V clamp between Pins 1 and 2 - ideal for AC-coupled or differential bus protection |
| High ESD robustness | Class 3B HBM (>16 kV) and IEC61000-4-2 Level 4 (±30 kV contact) - eliminates need for external TVS arrays |
| Pb-free and RoHS-compliant | Meets global environmental regulations without compromising thermal or electrical performance |
| Low thermal resistance | RJA = 556 °C/W on FR-5 board - sustains repeated 40 W pulses with minimal junction temperature rise |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Single-wire CAN network exposed to load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between bus line and ground to clamp surges before reaching transceiver. Use Value: Limits clamping voltage to 55 V during 0.76 A pulses, preventing damage to ISO 11898-3 compliant transceivers. |
Use Scenario: Factory automation node with long RS-485 trunk lines subject to lightning-induced surges. IC Role / Device Role / Timing Role: Dual-line protector on differential A/B pair, leveraging common-cathode architecture for balanced clamping. Use Value: Maintains signal integrity by holding leakage below 50 nA at 31.2 V while absorbing 40 W transients per line. |
| Medical Equipment I/O Ports | Point-of-Sale Terminal Interfaces |
Use Scenario: ESD-prone USB or serial ports on diagnostic imaging devices requiring Class 3B compliance. IC Role / Device Role / Timing Role: Primary ESD shunt on connector-facing traces, routed to chassis ground. Use Value: Withstands >16 kV HBM discharges without parametric shift, ensuring regulatory certification retention. |
Use Scenario: Retail kiosk with exposed keypad and display cables vulnerable to customer-handling ESD. IC Role / Device Role / Timing Role: Bidirectional clamp across VCC/GND rails or data lines to suppress contact discharge events. Use Value: Delivers ±30 kV IEC61000-4-2 protection in compact SOT-23 - critical for space-constrained enclosure designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ39VALT3G | Same SOT-23 package and 39 V nominal breakdown, but unidirectional (single anode/cathode) - lacks dual-line capability | Only protects one line; requires two devices for dual-line use, increasing BOM count and PCB area | Select when protecting isolated single-ended signals where common-cathode topology is unnecessary |
| SZMMBZ39VCLT3G | Identical electrical specs and pinout, but AEC-Q101 qualified and PPAP-capable for automotive production | Required for OEM automotive programs; not necessary for industrial or medical non-safety-critical use | Choose SZMMBZ39VCLT3G only if automotive qualification and change control traceability are mandatory |
Compared with MMBZ39VCLT3G, MMBZ39VALT3G doubles component count for dual-line protection, while SZMMBZ39VCLT3G adds automotive compliance overhead without electrical benefit - making MMBZ39VCLT3G optimal for cost-sensitive industrial and medical designs needing verified dual-Zener functionality.
Availability
MMBZ39VCLT3G is available at Aetrix Electronics and suitable for automotive CAN bus protection, industrial RS-485 interface hardening, and medical I/O port ESD suppression requiring stable component supply and legacy design continuity.
Supply support for MMBZ39VCLT3G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZxxVxL series was designed specifically for compact, high-reliability transient voltage suppression in space-constrained systems - emphasizing dual-junction integration, industry-standard ESD robustness, and SOT-23 manufacturability.
FAQ
Is MMBZ39VCLT3G still actively manufactured or marked as discontinued?
Yes, MMBZ39VCLT3G is marked as discontinued per onsemi's October 2025 datasheet revision (Rev. 18). However, Aetrix Electronics maintains active inventory and provides lifecycle coordination support, including last-time-buy planning and cross-reference guidance for ongoing production programs.
What is the exact pin configuration and polarity of MMBZ39VCLT3G?
MMBZ39VCLT3G uses SOT-23 Style 9: Pin 1 = Anode 1, Pin 2 = Anode 2, Pin 3 = Common Cathode. This dual-anode/common-cathode arrangement enables either two independent unidirectional clamps (1–3 and 2–3) or one bidirectional clamp (1–2), confirmed in the official mechanical drawings and marking diagram.
Can MMBZ39VCLT3G be used for bidirectional ESD protection on a single data line?
Yes, MMBZ39VCLT3G can be configured bidirectionally by connecting the signal line between Pins 1 and 2, with Pin 3 grounded. This leverages both Zener junctions to clamp positive and negative transients to ±39 V - validated in onsemi's typical applications and supported by its 55 V clamping voltage at 0.76 A in either polarity.
How does the 40 W peak pulse rating of MMBZ39VCLT3G translate to real-world surge handling?
The 40 W rating applies to a 1.0 ms pulse per Figure 5 in the datasheet - corresponding to IEC 61000-4-5 combination wave surges. At 0.76 A peak current, MMBZ39VCLT3G clamps to 55 V, limiting energy dissipation to 42 mJ per pulse, which aligns with standard industrial surge immunity requirements for protected I/O ports.
What is the difference between MMBZ39VCLT3G and SZMMBZ39VCLT3G?
SZMMBZ39VCLT3G is functionally identical to MMBZ39VCLT3G in electrical specs, pinout, and package, but carries AEC-Q101 qualification and PPAP documentation for automotive production. The "SZ" prefix denotes automotive-grade change control and traceability - MMBZ39VCLT3G remains suitable for non-automotive applications where qualification overhead is unnecessary.
MMBZ39VCLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- MMBZxxVxL
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 31.2V
- Voltage - Breakdown (Min):
- 37.05V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- Current - Peak Pulse (10/1000µs):
- 760mA
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ39VCLT3G FAQ
1.How can I place an order for MMBZ39VCLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ39VCLT3G 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 MMBZ39VCLT3G reliable?
The price and inventory of MMBZ39VCLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ39VCLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ39VCLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ39VCLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ39VCLT3G?
MMBZ39VCLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ39VCLT3G 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 MMBZ39VCLT3G?
For technical support, including MMBZ39VCLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ39VCLT3G requirements.
6.How does Aetrix verify that MMBZ39VCLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ39VCLT3G 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 MMBZ39VCLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ39VCLT3G?
All MMBZ39VCLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ39VCLT3G, 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 MMBZ39VCLT3G part is unused and in its original packaging.
Return procedure for MMBZ39VCLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ39VCLT3G 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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