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onsemi MMBZ39VCLT1G
- Part No.:
- MMBZ39VCLT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ39VCLT1G.pdf
- Description:
- ZENER DIODE PROTECTION, COMMON C
- Quantity:
- Payment:
- Shipping:
Inventory:5,757
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Product details
Overview
MMBZ39VCLT1G 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 reverse voltage, and 55 V clamping voltage at 0.76 A peak pulse current. It delivers ESD protection per IEC61000-4-2 Level 4 (±30 kV contact) and HBM Class 3B (>16 kV), with <50 nA leakage at VRWM - used in bidirectional transient suppression for CAN bus lines and I/O ports.
For engineers reviewing the MMBZ39VCLT1G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, dual-anode-to-cathode terminal mapping, real-world clamping behavior under surge conditions, and validated alternatives for ESD-sensitive signal line protection.
Technical Context
This device implements two monolithic silicon Zener junctions sharing a single cathode terminal (Pin 3), enabling either dual unidirectional protection (Pins 1–3 and 2–3) or one bidirectional configuration (Pins 1–2). Its 39 V nominal breakdown voltage (37.05–40.95 V range at 1.0 mA) supports robust overvoltage clamping in automotive and industrial interfaces.
The SOT-23 package supports surface-mount assembly with 260 °C soldering tolerance, UL 94 V-0 flammability rating, and Pb-free compliance. Thermal resistance is 556 °C/W on FR-5 board, limiting steady-state dissipation to 225 mW at 25 °C ambient - requiring derating above that temperature per Figure 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V - precise clamping threshold for 3.3 V/5 V/12 V system rails and CAN FD transceivers |
| Working Peak Reverse Voltage | 31.2 V - maximum continuous reverse bias before significant leakage; sets safe operating window below breakdown |
| Clamping Voltage @ IPP | 55 V @ 0.76 A - measured surge voltage during 1.0 ms pulse; defines worst-case voltage seen by protected IC |
| Peak Pulse Power | 40 W @ 1.0 ms - energy-handling capability for IEC61000-4-2 contact discharge events |
| ESD Rating | IEC61000-4-2 Level 4 (±30 kV contact) - meets automotive and industrial immunity requirements without external RC networks |
| Leakage Current | <50 nA @ 31.2 V - negligible standby current draw in always-on sensor or communication circuits |
| Package | SOT-23 (Case 318, Style 9) - 2.90 × 1.30 × 1.00 mm footprint; enables high-density layout for dual-line protection |
Pinout & Package
SOT-23 package (Case 318, Style 9) with void-free thermosetting plastic body, corrosion-resistant finish, and Pb-free construction. 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 protection or forms one side of bidirectional clamp |
| Pin 2 | Anode 2 | Second Zener anode - connects to Line 2; enables dual-line protection with shared cathode |
| Pin 3 | Cathode | Common cathode node - ties both Zeners to ground or reference rail; defines low-impedance return path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Enables simultaneous protection of two signal lines (e.g., CAN_H/CAN_L) using one compact SOT-23 device |
| Bidirectional configuration support | Pins 1 and 2 function as symmetric terminals - allows use as ±39 V clamp across differential pairs without polarity constraints |
| Low leakage & tight VBR tolerance | <50 nA IR at VRWM and ±3.5% VBR spread (37.05–40.95 V) ensure predictable turn-on and minimal standby power loss |
| High ESD robustness | Exceeds IEC61000-4-2 Level 4 (±30 kV contact) - eliminates need for secondary TVS stages in cost-sensitive designs |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed industrial equipment and automotive ECUs where flame propagation must be prevented |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Transient suppression on single-wire or differential CAN bus lines exposed to load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between CAN_H/CAN_L and chassis ground to limit surge-induced voltage excursions. Use Value: Clamps to 55 V during 0.76 A surge, preventing damage to CAN transceivers rated for ≤40 V absolute maximum ratings. |
Use Scenario: ESD protection for RS-485 transceiver I/O pins in factory automation controllers subject to operator contact discharge. IC Role / Device Role / Timing Role: Dual unidirectional Zener array protecting A and B lines independently while sharing ground return via Pin 3. Use Value: Delivers ±30 kV contact ESD immunity per IEC61000-4-2 without degrading signal integrity up to 20 Mbps. |
| Medical Equipment Sensor Inputs | Point-of-Sale Terminal Keypad Lines |
|
Use Scenario: Protecting analog sensor inputs (e.g., temperature, pressure) in portable medical devices from handling ESD. IC Role / Device Role / Timing Role: Low-leakage (≤50 nA) Zener pair shunting each sensor line to AGND, preserving DC accuracy and offset stability. Use Value: Maintains signal fidelity with sub-100 nA leakage while clamping transients faster than µC GPIO protection diodes. |
Use Scenario: Safeguarding membrane keypad scan lines in retail terminals against repeated human-body-model ESD events. IC Role / Device Role / Timing Role: Dual-anode configuration isolates key matrix rows/columns, preventing latch-up in microcontroller port drivers. Use Value: Withstands >16 kV HBM discharges without parameter shift, ensuring long-term reliability in high-touch environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ39VALT1G | Same SOT-23 package and 39 V nominal Zener voltage, but uses common-anode configuration (Pins 1+2 = cathode, Pin 3 = anode) | Requires PCB layout inversion: protected lines connect to Pins 1/2 instead of Pin 3; not drop-in compatible | Select when existing layout routes cathodes to signal lines and anode to ground - matches MMBZ39VCLT1G's functional role but opposite polarity mapping |
| SZMMBZ39VCLT1G | Identical electrical specs and pinout, but AEC-Q101 qualified and PPAP-capable for automotive production | Required for Tier 1 automotive programs; not suitable for cost-sensitive consumer applications due to qualification overhead | Choose SZMMBZ39VCLT1G only when automotive qualification documentation and traceability are contractually mandated |
Compared with MMBZ39VCLT1G, MMBZ39VALT1G offers identical clamping performance but inverted terminal polarity - demanding layout revision, whereas SZMMBZ39VCLT1G provides full drop-in compatibility with added automotive compliance overhead.
Availability
MMBZ39VCLT1G is available at Aetrix Electronics and suitable for automotive CAN bus protection, industrial RS-485 interface hardening, and medical sensor input safeguarding requiring stable component supply despite its discontinued status through legacy channel sourcing.
Supply support for MMBZ39VCLT1G 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 space-constrained, high-reliability ESD and surge protection in signal-line applications - emphasizing low leakage, tight voltage tolerance, and dual-junction integration in SOT-23.
FAQ
What is the exact Zener breakdown voltage range for MMBZ39VCLT1G?
The MMBZ39VCLT1G has a guaranteed breakdown voltage range of 37.05 V to 40.95 V at 1.0 mA test current (IT), with a nominal value of 39 V. This ±3.5% tolerance ensures consistent clamping behavior across production lots and temperature extremes from −55 °C to +150 °C, as confirmed in the onsemi datasheet Table 3.
Is MMBZ39VCLT1G still in active production?
No - MMBZ39VCLT1G is officially marked as discontinued per the onsemi datasheet Revision 18 (October 2025). However, Aetrix Electronics maintains access to remaining legacy inventory and authorized distributor stock, supporting continuity for existing designs through controlled allocation and traceable sourcing.
Can MMBZ39VCLT1G be used for bidirectional ESD protection?
Yes - MMBZ39VCLT1G supports bidirectional operation by connecting Pins 1 and 2 across a differential signal pair (e.g., CAN_H/CAN_L) with Pin 3 grounded. This configuration leverages both Zener junctions to clamp positive and negative transients symmetrically to ±55 V at 0.76 A, meeting IEC61000-4-2 Level 4 requirements.
What is the maximum clamping voltage of MMBZ39VCLT1G during a surge event?
The MMBZ39VCLT1G clamps to 55 V at a peak pulse current (IPP) of 0.76 A under the standard 1.0 ms exponential waveform (Figure 5). This value is measured per IEC61000-4-5 test conditions and defines the maximum voltage imposed on protected circuitry during worst-case surge events.
Does MMBZ39VCLT1G require external current-limiting resistors?
No - MMBZ39VCLT1G is designed for direct placement across protected lines without series impedance. Its 40 W peak power rating and thermal design accommodate transient energy absorption; however, sustained overvoltage beyond its 31.2 V VRWM will cause thermal runaway, so it must be used only in transient-suppression roles, not as a voltage regulator.
MMBZ39VCLT1G 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)
MMBZ39VCLT1G FAQ
1.How can I place an order for MMBZ39VCLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ39VCLT1G 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 MMBZ39VCLT1G reliable?
The price and inventory of MMBZ39VCLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ39VCLT1G is usually 5 days.
3.What payment methods are accepted for MMBZ39VCLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ39VCLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ39VCLT1G?
MMBZ39VCLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ39VCLT1G 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 MMBZ39VCLT1G?
For technical support, including MMBZ39VCLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ39VCLT1G requirements.
6.How does Aetrix verify that MMBZ39VCLT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ39VCLT1G 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 MMBZ39VCLT1G meets industry standards.
7.What is the process for return or replacement of MMBZ39VCLT1G?
All MMBZ39VCLT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ39VCLT1G, 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 MMBZ39VCLT1G part is unused and in its original packaging.
Return procedure for MMBZ39VCLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ39VCLT1G Tags
-
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
-
D12V0L1B2LP-7B
Diodes Incorporated
-
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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