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onsemi MMBZ20VALT1
- Part No.:
- MMBZ20VALT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
MMBZ20VALT1.pdf
- Description:
- TVS ZENER DUAL CA 40W 20V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,525
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Product details
Overview
MMBZ20VALT1 from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient overvoltage and ESD protection of two independent signal lines. It features 20 V nominal Zener breakdown voltage (19.0–21.0 V), 40 W peak pulse power at 1.0 ms, clamping voltage of 28 V at 1.4 A peak pulse current, and IEC 61000-4-2 Level 4 ±30 kV contact discharge rating. It is used in USB, HDMI, and GPIO line protection in portable computing and industrial control interfaces.
For engineers reviewing the MMBZ20VALT1 datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional/unidirectional configuration flexibility, low clamping voltage relative to working voltage, dual-line protection density, and automotive-grade AEC-Q101 qualification status.
Technical Context
This device integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling either two independent unidirectional clamps (Pins 1–3 and Pins 2–3) or a single bidirectional clamp (Pins 1–2). Its 40 W peak power rating applies under the standardized 1.0 ms rectangular surge waveform per Figure 6, with thermal derating above 25 °C per Figure 7.
The MMBZ20VALT1 operates with 17 V working peak reverse voltage (VRWM), 50 nA max reverse leakage at VRWM, and 1.0 mA test current for breakdown verification. Its temperature coefficient of VBR is +1.4 mV/°C, supporting stable clamping across −55 to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 19.0–21.0 V @ IT = 1.0 mA - defines precise clamping threshold for overvoltage events |
| Working Peak Reverse Voltage (VRWM) | 17 V - maximum continuous reverse voltage before significant leakage begins |
| Clamping Voltage (VC) | 28 V @ IPP = 1.4 A - actual voltage seen by protected circuit during 40 W surge |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - energy-handling capacity for transient suppression per IEC 61000-4-2 |
| ESD Rating | ±30 kV contact discharge (IEC 61000-4-2 Level 4) - meets industrial and medical equipment immunity requirements |
| Leakage Current (IR) | ≤50 nA @ VRWM = 17 V - ensures minimal signal loading in high-impedance interfaces |
| Package | SOT-23 (Case 318, Style 12) - surface-mount footprint measuring 2.90 × 1.30 × 1.00 mm for high-density PCB layout |
Pinout & Package
SOT-23 package with molded thermosetting plastic case, UL 94 V-0 flammability rating, and Pb-free/RoHS-compliant construction. Designed for automated placement and reflow soldering at up to 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First Zener junction cathode - connects to Line 1 for unidirectional protection or forms one side of bidirectional clamp |
| Pin 2 | Cathode 2 | Second Zener junction cathode - connects to Line 2 for independent clamping or completes bidirectional path with Pin 1 |
| Pin 3 | Anode (Common) | Shared anode node - ties both Zener junctions to GND or reference rail; enables dual-line protection in single footprint |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Protects two signal lines with one SOT-23 device - reduces board area by ~50% vs. discrete dual-diode solutions |
| IEC 61000-4-2 Level 4 compliance | ±30 kV contact discharge rating - satisfies stringent ESD immunity for end-user accessible ports |
| Low clamping-to-working voltage ratio | VC/VRWM = 28 V / 17 V ≈ 1.65 - provides robust margin between operating and clamping thresholds |
| High surge current capability | 1.4 A peak pulse current - handles fast transients without degradation in compact form factor |
| AEC-Q101 qualified option available | SZMMBZ20VALT1G variant supports automotive applications with PPAP documentation and site-controlled manufacturing |
Applications
| USB 2.0 Data Line Protection | HDMI Hot-Plug Detection Line |
|---|---|
|
Use Scenario: Protecting D+ and D− differential pair against ESD events during cable insertion/removal in portable peripherals. IC Role / Device Role / Timing Role: Dual unidirectional clamp - Pin 1–3 protects D+, Pin 2–3 protects D−, common anode tied to system ground. Use Value: Prevents latch-up or damage to USB transceivers while maintaining signal integrity below 480 Mbps due to low capacitance (<30 pF). |
Use Scenario: Safeguarding HDMI HPD (Hot-Plug Detect) line from user-induced ESD when connecting/disconnecting displays. IC Role / Device Role / Timing Role: Unidirectional Zener clamp - Pin 1–3 connected between HPD and GND; Pin 2 unused or grounded. Use Value: Ensures reliable HPD logic-level detection (0–5 V) without false triggers, leveraging 17 V VRWM and 28 V VC to avoid interference during normal operation. |
| Industrial I/O Port Protection | Medical Sensor Interface |
|
Use Scenario: Shielding RS-485 or CAN bus termination resistors and transceiver pins from field-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamp - Pins 1 and 2 connected to differential bus lines, Pin 3 to chassis ground. Use Value: Withstands repetitive 40 W transients without parameter shift, supporting long-term reliability in harsh electromagnetic environments. |
Use Scenario: Guarding analog front-end inputs of patient-monitoring devices (e.g., ECG, SpO₂) against electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Dual unidirectional clamp - one channel for sensor excitation line, second for return path, shared anode to isolated safety ground. Use Value: Meets IEC 60601-1-2 ESD immunity requirements while introducing <1 nA leakage to preserve microvolt-level signal accuracy. |
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 |
|---|---|---|---|
| MMBZ20VALT1G | Same electrical specs; "G" suffix denotes Pb-free/RoHS-compliant version with microdot marking | No functional difference - identical performance and footprint; required for RoHS-constrained designs | Select MMBZ20VALT1G when full RoHS compliance documentation and traceable Pb-free sourcing are mandatory. |
| SZMMBZ20VALT1G | Automotive-grade variant with AEC-Q101 qualification, enhanced process controls, and PPAP support | Required for automotive infotainment, ADAS, or body electronics where qualification evidence is contractually enforced | Choose SZMMBZ20VALT1G only when automotive OEM requirements mandate AEC-Q101 certification and controlled change management. |
Compared with MMBZ20VALT1, the MMBZ20VALT1G offers identical protection performance with formal RoHS compliance, while SZMMBZ20VALT1G adds automotive qualification overhead - neither is pin-compatible with non-SOT-23 dual-Zener alternatives like SO-8 packages, and all three share identical pinout and thermal behavior.
Availability
MMBZ20VALT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial I/O safeguarding, and medical sensor front-end designs requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBZ20VALT1 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 management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The MMBZxxxALT1G series targets high-density transient voltage suppression in space-constrained applications, with design emphasis on ESD robustness, low clamping voltage, and dual-line integration to reduce bill-of-materials count.
FAQ
What is the maximum clamping voltage of the MMBZ20VALT1 during a 40 W ESD event?
The MMBZ20VALT1 clamps to 28 V at its specified peak pulse current of 1.4 A, which corresponds to the 40 W surge condition defined by the 1.0 ms rectangular waveform in the datasheet. This value is measured under standard test conditions (TA = 25 °C) and remains valid across the full −55 to +150 °C junction temperature range, making it suitable for use in environments with wide thermal variation. The MMBZ20VALT1 maintains this clamping performance without degradation after repeated surges within its rated limits.
Can the MMBZ20VALT1 be used in bidirectional signal line protection?
Yes, the MMBZ20VALT1 supports bidirectional protection by connecting Pins 1 and 2 to the differential signal pair and Pin 3 to ground - forming a symmetrical clamp using both Zener junctions back-to-back. This configuration delivers ±28 V clamping for AC-coupled or floating lines such as RS-485 or HDMI TMDS pairs. The MMBZ20VALT1 achieves this without external components, leveraging its internal common-anode architecture to eliminate the need for discrete dual-diode arrangements.
What is the working peak reverse voltage (VRWM) specification for the MMBZ20VALT1?
The MMBZ20VALT1 has a working peak reverse voltage (VRWM) of 17 V, meaning it sustains less than 50 nA reverse leakage current up to this voltage under DC or low-frequency conditions. This parameter ensures the MMBZ20VALT1 remains effectively invisible to circuits operating below 17 V, preserving signal integrity and power efficiency in protected interfaces like 12 V industrial buses or 5 V logic lines. Exceeding VRWM initiates controlled conduction, triggering clamping action only during transient overvoltage events.
Is the MMBZ20VALT1 suitable for automotive applications?
The base MMBZ20VALT1 is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ20VALT1G is fully qualified and PPAP-capable. While the MMBZ20VALT1 shares identical electrical and mechanical characteristics, only the SZ-prefixed variant meets automotive process control, lot traceability, and stress-test requirements. For non-automotive industrial or medical use, the MMBZ20VALT1 delivers equivalent protection performance with standard commercial qualification - confirming that MMBZ20VALT1 remains appropriate for non-automotive ESD-sensitive systems.
How does the thermal resistance of the MMBZ20VALT1 affect its power handling on a standard PCB?
The MMBZ20VALT1 exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W on FR-5 board, limiting its steady-state power dissipation to 225 mW at 25 °C ambient. However, its 40 W peak pulse rating applies only to short-duration transients (≤1.0 ms), where thermal mass prevents immediate junction overheating. For sustained operation, the MMBZ20VALT1 must be placed on copper pours or thermally enhanced substrates - its RJA drops to 417 °C/W on alumina, enabling higher continuous dissipation. This distinction ensures the MMBZ20VALT1 safely absorbs surge energy without requiring oversized heatsinks.
MMBZ20VALT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ20VALT1 FAQ
1.How can I place an order for MMBZ20VALT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ20VALT1 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 MMBZ20VALT1 reliable?
The price and inventory of MMBZ20VALT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ20VALT1 is usually 5 days.
3.What payment methods are accepted for MMBZ20VALT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ20VALT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ20VALT1?
MMBZ20VALT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ20VALT1 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 MMBZ20VALT1?
For technical support, including MMBZ20VALT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ20VALT1 requirements.
6.How does Aetrix verify that MMBZ20VALT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ20VALT1 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 MMBZ20VALT1 meets industry standards.
7.What is the process for return or replacement of MMBZ20VALT1?
All MMBZ20VALT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ20VALT1, 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 MMBZ20VALT1 part is unused and in its original packaging.
Return procedure for MMBZ20VALT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ20VALT1 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
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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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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