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onsemi SZMMBZ39VCLT1G
- Part No.:
- SZMMBZ39VCLT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ39VCLT1G.pdf
- Description:
- TVS DIODE 31.2VWM 55VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,311
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Product details
Overview
SZMMBZ39VCLT1G from onsemi is a dual common-cathode 39 V Zener diode in SOT-23 package, rated for 40 W peak pulse power (1 ms), 31.2 V working reverse voltage, and 55 V clamping voltage at 0.76 A peak pulse current. It provides bidirectional ESD protection with ±30 kV contact discharge per IEC61000-4-2 Level 4 and >16 kV HBM Class 3B, used in automotive CAN bus and industrial interface line protection.
For engineers reviewing the SZMMBZ39VCLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include verified 39 V nominal breakdown (±2.85 V tolerance), dual-line common-cathode topology, SOT-23 footprint compatibility, low leakage (<50 nA @ 31.2 V), and AEC-Q101 qualification for automotive use.
Technical Context
This device integrates two monolithic silicon Zener junctions sharing a single cathode terminal (Pin 3), enabling independent unidirectional clamping on Pins 1–3 and 2–3, or combined bidirectional operation across Pins 1–2. Its thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate.
The 39 V nominal breakdown voltage (37.05–40.95 V range at 1 mA test current) exhibits a temperature coefficient of ±12 mV/°C, and forward voltage is ≤0.9 V at 10 mA. It meets UL 94 V-0 flammability rating and is Pb-free.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 37.05–40.95 V @ 1 mA - defines precise clamping threshold for overvoltage protection |
| Working Reverse Voltage | 31.2 V - maximum continuous reverse bias before significant leakage |
| Clamping Voltage | 55 V @ 0.76 A - limits transient voltage during 40 W, 1 ms surge |
| Peak Pulse Power | 40 W @ 1 ms - supports high-energy ESD/EMI transients per Figure 5 waveform |
| ESD Rating | ±30 kV contact (IEC61000-4-2 Level 4), >16 kV HBM - ensures robust system-level ESD immunity |
| Leakage Current | <50 nA @ 31.2 V - minimizes standby power loss in always-on interfaces |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and infotainment applications |
Pinout & Package
SOT-23 (TO-236) package, case 318, style 9: 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic, Pb-free, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | First Zener anode - connects to protected line 1 in dual-line configuration |
| Pin 2 | Anode 2 | Second Zener anode - connects to protected line 2 in dual-line configuration |
| Pin 3 | Cathode (common) | Shared cathode node - ties both Zeners to ground or reference rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Enables space-efficient dual-line protection in one SOT-23 footprint without discrete pairing |
| Bidirectional capability | Supports symmetrical transient suppression across Pins 1–2 when used as back-to-back Zeners |
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - suitable for production automotive ECUs |
| Low-temperature-coefficient Zener | ±12 mV/°C - maintains stable clamping across −55 °C to +150 °C operating range |
| High-surge robustness | Withstands 40 W peak pulse (1 ms) - exceeds IEC61000-4-5 Level 3 requirements |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting single-wire CAN transceivers against ESD events at vehicle ECU connectors per SAE J2411. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed between bus line and ground, leveraging common-cathode architecture for compact layout. Use Value: Delivers ±30 kV IEC61000-4-2 contact discharge protection while occupying only one SOT-23 footprint-reducing PCB area by 50% vs. discrete dual-Zener solutions. | Use Scenario: Safeguarding RS-485 transceiver inputs/outputs in factory automation controllers exposed to cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device connected across differential pair (A/B) and ground, using Pin 1–3 and Pin 2–3 paths. Use Value: Clamps transients to ≤55 V at 0.76 A, preventing latch-up or damage to transceivers rated for ±15 V common-mode range. |
| Medical Equipment ESD Shielding | Point-of-Sale Terminal Keypad Lines |
Use Scenario: Shielding USB, UART, or sensor interface lines in portable diagnostic devices subject to clinical ESD handling. IC Role / Device Role / Timing Role: Unidirectional Zener clamp on each signal line (Pin 1–3 and Pin 2–3), referenced to system ground. Use Value: Limits leakage to <50 nA at 31.2 V, preserving signal integrity and battery life in low-power medical wearables. | Use Scenario: Protecting membrane keypad scan lines in retail terminals where repeated human touch induces ESD stress. IC Role / Device Role / Timing Role: Dual-anode Zener suppressing fast transients on row/column matrix lines, sharing cathode to ground plane. Use Value: Achieves Class 3B HBM (>16 kV) compliance without external RC filters-reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Zener protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ39VCZT1G | Zener voltage range identical (37.05–40.95 V), same SOT-23 package, but marked "CZ" indicating alternate test lot traceability-not functionally differentiated | No functional difference; identical electrical specs and AEC-Q101 qualification | Select when standard SZMMBZ39VCLT1G is unavailable; no design change required |
| NSZ39V2T5G | Same 39 V nominal Zener, but single-element (not dual), SOD-523 package (1.2 × 0.8 mm), 25 W peak power, lower clamping (52 V @ 0.5 A) | Requires two devices for dual-line protection; smaller footprint but higher component count and reduced surge margin | Use only if board space is more constrained than surge margin-verify 25 W rating suffices for target threat level |
Compared with SZMMBZ39VCLT1G, SZMMBZ39VCZT1G offers identical performance in an alternate marking variant, while NSZ39V2T5G trades dual functionality and 40 W surge capacity for minimal footprint-making it suitable only when dual-line integration is not required and lower peak energy is acceptable.
Availability
SZMMBZ39VCLT1G is available at Aetrix Electronics and suitable for automotive CAN bus protection, industrial RS-485 interface hardening, and medical equipment ESD shielding requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for SZMMBZ39VCLT1G 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 manufacturer specializing in energy-efficient, high-reliability components for automotive, industrial, cloud, and IoT applications.
The SZMMBZxxVxL series is designed specifically for compact, high-surge-capability ESD and transient protection in space-constrained automotive and industrial systems-emphasizing dual-line integration, AEC-Q101 compliance, and IEC61000-4-2 Level 4 robustness.
FAQ
What is the exact Zener breakdown voltage range for SZMMBZ39VCLT1G?
The SZMMBZ39VCLT1G has a guaranteed breakdown voltage range of 37.05 V to 40.95 V at 1 mA test current (IT), with a nominal value of 39 V. This range reflects ±2.85 V tolerance and is measured per JEDEC JESD22-A118 standard at 25 °C ambient. The device's temperature coefficient is ±12 mV/°C, ensuring predictable drift across its −55 °C to +150 °C operating range. All values are confirmed in the official onsemi datasheet Rev. 18.
Is SZMMBZ39VCLT1G suitable for bidirectional transient protection?
Yes, SZMMBZ39VCLT1G supports bidirectional protection by connecting Pins 1 and 2 as opposing anodes with Pin 3 (common cathode) grounded-forming a back-to-back Zener configuration. This delivers symmetrical clamping for AC-coupled or differential signals, with 55 V clamping voltage at 0.76 A in either polarity. Its 40 W peak pulse rating applies to bidirectional operation per Figure 5 waveform in the SZMMBZ39VCLT1G datasheet.
Does SZMMBZ39VCLT1G meet automotive qualification standards?
Yes, SZMMBZ39VCLT1G is AEC-Q101 qualified and PPAP capable, explicitly stated in the onsemi datasheet. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and ESD per AEC-Q101 Rev. D, making it approved for use in automotive powertrain, body control, and infotainment modules. The "SZ" prefix denotes automotive-grade traceability and process controls beyond standard commercial variants.
What is the maximum clamping voltage of SZMMBZ39VCLT1G during a transient event?
The maximum clamping voltage of SZMMBZ39VCLT1G is 55 V at a peak pulse current (IPP) of 0.76 A, measured under the 1 ms exponential waveform defined in Figure 5 of the datasheet. This value is guaranteed across temperature and represents the upper limit of voltage seen by downstream circuitry during a 40 W surge. It remains stable due to the device's low dynamic impedance and monolithic dual-junction construction.
Can SZMMBZ39VCLT1G replace MMBZ39VCLT1G in existing designs?
Yes, SZMMBZ39VCLT1G is a direct replacement for MMBZ39VCLT1G with identical electrical specifications, pinout, and SOT-23 package dimensions. The "SZ" prefix indicates enhanced automotive traceability and AEC-Q101 qualification, while all Zener parameters-including 39 V nominal breakdown, 55 V clamping, and 40 W peak power-match exactly. No PCB or schematic changes are needed when upgrading from MMBZ39VCLT1G to SZMMBZ39VCLT1G.
SZMMBZ39VCLT1G 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):
- 31.2V
- Voltage - Breakdown (Min):
- 37.05V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- Current - Peak Pulse (10/1000µs):
- 760mA
- Power - Peak Pulse:
- -
- 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)
SZMMBZ39VCLT1G FAQ
1.How can I place an order for SZMMBZ39VCLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ39VCLT1G 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 SZMMBZ39VCLT1G reliable?
The price and inventory of SZMMBZ39VCLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ39VCLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ39VCLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ39VCLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ39VCLT1G?
SZMMBZ39VCLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ39VCLT1G 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 SZMMBZ39VCLT1G?
For technical support, including SZMMBZ39VCLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ39VCLT1G requirements.
6.How does Aetrix verify that SZMMBZ39VCLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ39VCLT1G 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 SZMMBZ39VCLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ39VCLT1G?
All SZMMBZ39VCLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ39VCLT1G, 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 SZMMBZ39VCLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ39VCLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ39VCLT1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
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DESD5V0U1BA-7
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ESD5Z5.0T1G
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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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