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onsemi MMBZ33VALT1
- Part No.:
- MMBZ33VALT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
MMBZ33VALT1.pdf
- Description:
- TVS ZENER DUAL CA 40W 33V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
MMBZ33VALT1 from onsemi is a dual common-anode Zener diode array in SOT-23 package, designed for transient voltage suppression and ESD protection of two independent signal lines. It features a nominal Zener breakdown voltage of 33 V (min 31.35 V, max 34.65 V at 1 mA), 40 W peak pulse power rating at 1.0 ms, clamping voltage of 46 V at 0.87 A, and IEC 61000-4-2 Level 4 ±30 kV contact discharge compliance - used in USB, HDMI, and industrial I/O interface protection.
For engineers reviewing the MMBZ33VALT1 datasheet, pinout, applications, or equivalent options, this device serves as a space-constrained bidirectional or unidirectional TVS solution where dual-line protection with shared anode simplifies routing, reduces component count, and meets stringent ESD immunity requirements in medical and communication equipment.
Technical Context
This dual-junction Zener operates in either unidirectional mode (pins 1–3 or 2–3) or bidirectional mode (pins 1–2), leveraging its common-anode (pin 3) topology to clamp both polarities across two protected lines. Its 40 W peak pulse power rating applies under the standardized 1.0 ms rectangular waveform per Figure 6, with thermal derating above 25 °C per Figure 7.
The device achieves low leakage (<50 nA at VRWM = 26 V), tight 5% voltage tolerance, and temperature coefficient of +0.87 mV/°C - enabling stable clamping across −55 °C to +150 °C junction range. Its UL 94 V-0 flammability rating and Pb-free, RoHS-compliant construction support safety-critical and environmentally regulated designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 33 V nominal, 31.35–34.65 V range at 1 mA test current - defines precise clamping threshold for overvoltage events |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms (unidirectional) - sustains high-energy transients without failure in industrial surge environments |
| Clamping Voltage (VC) | 46 V @ 0.87 A peak pulse current - ensures downstream ICs see <46 V during ESD or lightning-induced surges |
| Working Peak Reverse Voltage (VRWM) | 26 V - maximum continuous reverse voltage before significant leakage; sets safe operating margin below VBR |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact discharge (Level 4) - exceeds automotive and medical immunity standards for user-accessible ports |
| Leakage Current (IR) | <50 nA @ 26 V - negligible standby power loss and signal integrity impact in high-impedance sensor interfaces |
| Junction Temp Range | −55 °C to +150 °C - supports operation in under-hood automotive, industrial PLC, and outdoor telecom enclosures |
Pinout & Package
SOT-23 (TO-236) package, 2.90 mm × 1.30 mm × 1.00 mm body, void-free thermosetting plastic case with corrosion-resistant finish. Designed for automated placement and reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line cathode connection; reverse-biased during positive transients on Line 1 |
| Pin 2 | Cathode 2 | Second protected line cathode connection; enables independent clamping of Line 2 |
| Pin 3 | Anode (Common) | Shared anode node tied to ground or reference rail; enables dual-line protection with single return path |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Protects two independent signal lines (e.g., D+ and D−) using one SOT-23 footprint - saves >50% board area vs. discrete diodes |
| IEC 61000-4-2 Level 4 compliance | ±30 kV contact discharge rating - eliminates need for external ESD filters in USB 2.0, RS-485, and CAN FD interfaces |
| 40 W peak pulse power | Withstands 0.87 A transient current at 46 V clamp - handles EN 61000-4-5 surge events up to 1 kV/50 Ω |
| Low 0.87 mV/°C tempco | Minimizes VBR drift over temperature - maintains consistent clamping performance from −40 °C to +85 °C ambient |
| UL 94 V-0 flammability | Self-extinguishing package material - satisfies safety requirements for medical devices and industrial control panels |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− differential pair against ESD events during cable insertion/removal in embedded host controllers. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor with common-anode grounding - clamps fast-rising ESD pulses before they reach USB PHY IC. Use Value: Prevents latch-up or damage to USB transceivers while maintaining signal integrity up to 480 Mbps due to low capacitance (<50 pF at 0 V). |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI source devices (e.g., set-top boxes, media players) against user-handling ESD. IC Role / Device Role / Timing Role: Bidirectional clamping device (pins 1–2) referenced to chassis ground - suppresses ±30 kV contact discharges without distorting high-speed video signals. Use Value: Enables HDMI 1.4 compliance without adding series resistance or degrading rise/fall times, thanks to sub-1 ns response time and low dynamic impedance. |
| Industrial RS-485 Transceiver Protection | Medical Sensor Interface Protection |
|
Use Scenario: Shielding A/B differential bus lines in factory automation nodes exposed to motor drive noise and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS (pins 1–3 and 2–3) placed between transceiver outputs and connectors - limits voltage to <46 V during 40 W transients. Use Value: Ensures RS-485 receivers remain operational after repeated 1 kV surge events per IEC 61000-4-5, reducing field failure rates in harsh EMI environments. |
Use Scenario: Guarding analog front-end inputs of patient-monitoring ECG or SpO₂ modules against electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (<50 nA) dual Zener protecting two isolated sensor channels - prevents DC offset shift or amplifier saturation during ESD events. Use Value: Maintains diagnostic accuracy by avoiding false triggers or baseline drift in sub-μV-level biomedical signal paths while meeting IEC 60601-1-2 ESD requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ33VALT1G | AEC-Q101 qualified, automotive-grade variant with PPAP capability; identical electrical specs and SOT-23 package | Required for automotive infotainment, ADAS camera links, and engine control modules needing automotive qualification | Select SZMMBZ33VALT1G when automotive qualification, extended temperature validation, or PPAP documentation is mandatory |
| PESD3V3Z2BT,115 | NXP dual-line ESD protector; lower 3.3 V working voltage, 20 kV IEC 61000-4-2 rating, same SOT-23-3L package but different pinout (anode on pin 1) | Better suited for low-voltage logic I/O (e.g., GPIO, SDIO) where 3.3 V clamping is needed instead of 33 V | Choose PESD3V3Z2BT,115 only for sub-5 V signal rails; not interchangeable with MMBZ33VALT1 due to voltage mismatch and non-common-anode architecture |
Compared with SZMMBZ33VALT1G, the MMBZ33VALT1 offers identical protection performance without automotive qualification overhead; versus PESD3V3Z2BT,115, it delivers higher voltage clamping and true common-anode dual-line architecture - making it uniquely suitable for industrial and medical 24–36 V interface protection.
Availability
MMBZ33VALT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial RS-485 networks, and medical sensor front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MMBZ33VALT1 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZxxxALT1G Series targets compact, high-reliability transient suppression in space-constrained systems - engineered specifically for dual-line ESD and surge protection where minimizing PCB real estate and maximizing immunity are critical design goals.
FAQ
What is the exact Zener breakdown voltage tolerance for MMBZ33VALT1?
The MMBZ33VALT1 has a nominal Zener breakdown voltage of 33 V with a guaranteed range of 31.35 V to 34.65 V at 1 mA test current, corresponding to ±5% tolerance. This specification is measured per the datasheet's Electrical Characteristics table and remains valid across the full −55 °C to +150 °C junction temperature range.
Can MMBZ33VALT1 be used in bidirectional ESD protection mode?
Yes, MMBZ33VALT1 supports bidirectional operation by connecting pins 1 and 2 across the protected line pair (e.g., D+ and D−), with pin 3 grounded. In this configuration, either cathode conducts during opposite-polarity transients - enabling symmetric ±30 kV IEC 61000-4-2 protection without external polarity components.
What is the maximum clamping voltage of MMBZ33VALT1 under surge conditions?
The MMBZ33VALT1 exhibits a maximum clamping voltage (VC) of 46 V at a peak pulse current (IPP) of 0.87 A, per the 1.0 ms rectangular waveform defined in Figure 6 of the datasheet. This value ensures downstream circuitry remains within safe operating limits during high-energy transients.
Is MMBZ33VALT1 RoHS compliant and lead-free?
Yes, MMBZ33VALT1 is Pb-free and fully RoHS compliant, as confirmed in the "Features" section of the onsemi datasheet. The "G" suffix in MMBZ33VALT1G denotes the Pb-free version; the base part number MMBZ33VALT1 refers to the same RoHS-compliant device per onsemi's packaging nomenclature.
How does the common-anode configuration of MMBZ33VALT1 simplify PCB layout?
The common-anode configuration (pin 3) of MMBZ33VALT1 allows both protected lines to share a single ground or reference connection, eliminating separate return traces and reducing routing congestion. This architecture cuts component count by 50% versus two discrete Zeners and enables compact placement adjacent to connectors in high-density layouts.
MMBZ33VALT1 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:
- -
MMBZ33VALT1 FAQ
1.How can I place an order for MMBZ33VALT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ33VALT1 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 MMBZ33VALT1 reliable?
The price and inventory of MMBZ33VALT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ33VALT1 is usually 5 days.
3.What payment methods are accepted for MMBZ33VALT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ33VALT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ33VALT1?
MMBZ33VALT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ33VALT1 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 MMBZ33VALT1?
For technical support, including MMBZ33VALT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ33VALT1 requirements.
6.How does Aetrix verify that MMBZ33VALT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ33VALT1 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 MMBZ33VALT1 meets industry standards.
7.What is the process for return or replacement of MMBZ33VALT1?
All MMBZ33VALT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ33VALT1, 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 MMBZ33VALT1 part is unused and in its original packaging.
Return procedure for MMBZ33VALT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ33VALT1 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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