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Nexperia USA Inc. MMBZ18VAL-QR
- Part No.:
- MMBZ18VAL-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ18VAL-QR.pdf
- Description:
- MMBZ18VAL-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,539
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Product details
Overview
MMBZ18VAL-Q from Nexperia is a unidirectional double ESD protection diode in common-anode SOT23 configuration, designed for transient overvoltage protection of two signal lines. It delivers 30 kV contact ESD immunity (IEC 61000-4-2 Level 4), 70–90 pF capacitance at 1 MHz, and clamps transients to ≤25 V at 1.6 A peak pulse current - deployed in automotive ECUs and high-speed USB/USB-C data lines.
For engineers reviewing the MMBZ18VAL-Q datasheet, MMBZ18VAL-Q pinout, MMBZ18VAL-Q application, or MMBZ18VAL-Q equivalent, key selection criteria include its dual-line unidirectional topology, low 5 nA leakage at 14.5 V standoff, AEC-Q101 qualification, and 40 W peak pulse power handling per diode leg.
Technical Context
This device implements a common-anode dual-diode structure enabling simultaneous unidirectional protection of two independent signal paths - each cathode (Pin 1 and Pin 2) connects to a protected line, while the shared anode (Pin 3) ties to ground. Its IEC 61000-4-2 Level 4 compliance and 30 kV contact discharge rating confirm robust system-level ESD resilience.
The diode exhibits a 17.1–18.9 V breakdown voltage at 1 mA, a 14.5 V reverse standoff voltage, and clamps to ≤25 V under 1.6 A 10/1000 µs surge pulses per IEC 61643-321. Thermal resistance from junction to solder point is 340 K/W on standard FR4 PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage | 14.5 V - maximum continuous operating voltage before conduction begins on either protected line |
| Clamping Voltage | ≤25 V at 1.6 A - limits transient-induced voltage overshoot during ESD events to protect downstream IC inputs |
| Diode Capacitance | 70–90 pF at 1 MHz - preserves signal integrity on high-speed interfaces like USB 2.0 and HDMI without excessive loading |
| Peak Pulse Power | 40 W per diode - sustains 10/1000 µs surges up to 1.6 A without degradation under IEC 61643-321 conditions |
| ESD Rating | 30 kV contact discharge - meets IEC 61000-4-2 Level 4 for direct human-body ESD stress on connectors and ports |
| Leakage Current | 0.1–5 nA at 14.5 V - minimizes standby power loss and avoids false triggering in low-current sensor or bias circuits |
| Breakdown Voltage | 17.1–18.9 V at 1 mA - ensures reliable turn-on margin above 14.5 V standoff, preventing premature conduction |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body; optimized for automated placement and reflow soldering on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to first protected signal line; conducts ESD current to common anode (Pin 3) when voltage exceeds VRWM |
| 2 (K2) | Cathode of Diode 2 | Connects to second protected signal line; enables independent unidirectional clamping for dual-line protection |
| 3 (A) | Common Anode | Ground reference node for both diodes; must be routed with low-inductance path to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Common-anode dual-diode architecture | Enables compact, single-component protection of two unidirectional signal lines without cross-talk or shared cathode routing |
| AEC-Q101 qualification | Validated for automotive environments including temperature cycling (−55 °C to +150 °C) and mechanical shock, supporting ECU deployment |
| Ultra-low leakage (≤5 nA) | Prevents DC loading on high-impedance analog sensors or battery-powered I²C/SPI bus lines during normal operation |
| Bidirectional capability on one line | When used with external series resistor, supports bidirectional ESD protection on single-ended lines such as audio or CAN stubs |
| 460 K/W junction-to-ambient thermal resistance | Allows safe operation at full 40 W pulse power in free-air conditions without heatsinking on standard FR4 PCB layouts |
Applications
| Automotive ECUs | USB 2.0 Data Lines |
|---|---|
Use Scenario: Protecting LIN/CAN physical layer interface pins and sensor input traces in engine control units exposed to under-hood ESD events. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point to shunt ESD energy before reaching MCU GPIO or transceiver inputs. Use Value: Prevents latch-up or gate oxide damage in AEC-Q100 qualified microcontrollers by clamping transients to ≤25 V within nanoseconds. |
Use Scenario: Shielding D+ and D− differential pairs in USB 2.0 host ports against user-handling ESD during cable insertion. IC Role / Device Role / Timing Role: Dual-cathode ESD clamp ensuring matched capacitance (<90 pF) and timing response across both signal lines to preserve eye diagram integrity. Use Value: Maintains USB 2.0 full-speed signaling (480 Mbps) without jitter increase or bit error rate degradation due to parasitic loading. |
| Portable Audio Interfaces | Industrial HMI Touch Panels |
Use Scenario: Guarding analog audio input/output jacks (3.5 mm TRRS) in Bluetooth headsets and portable DACs against pocket-discharge ESD. IC Role / Device Role / Timing Role: Low-leakage (≤5 nA) unidirectional clamp preserving DC bias stability on op-amp inputs while suppressing ±30 kV transients. Use Value: Eliminates audible pop/crackle during plug insertion and prevents permanent distortion in Class AB amplifier stages. |
Use Scenario: Protecting projected-capacitive touch controller I/O pins (SCL/SDA, INT, RST) on factory-floor HMIs subject to operator glove discharge. IC Role / Device Role / Timing Role: Common-anode dual-diode layout allows single-device coverage of I²C bus and interrupt line without footprint duplication. Use Value: Reduces BOM count by 50% versus discrete TVS solutions while maintaining <100 ps response time for touch event reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-line ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NUP4201MR6T1G | Higher 120 pF capacitance; 24 V clamping at 1 A; non-AEC-Q101 rated | Acceptable for consumer USB but unsuitable for automotive due to lack of AEC-Q101 qualification and higher clamping voltage | Select only for cost-sensitive industrial or commercial designs where AEC-Q101 and sub-25 V clamping are not required |
| Vishay VEML6030X01 | Single-channel ESD diode (not dual); 15 pF typical; 12 V standoff; no common-anode configuration | Requires two devices for dual-line protection, increasing PCB area and routing complexity vs. MMBZ18VAL-Q's integrated solution | Prefer when ultra-low capacitance (<20 pF) is mandatory for >1 GHz RF front-end protection, not for general-purpose data lines |
Compared with NUP4201MR6T1G and VEML6030X01, MMBZ18VAL-Q uniquely combines AEC-Q101 qualification, common-anode dual-line topology, and ≤25 V clamping - making it the only option validated for automotive-grade USB and CAN interface protection without design compromise.
Availability
MMBZ18VAL-Q is available at Aetrix Electronics and suitable for automotive electronic control units, USB 2.0 interface protection, and portable audio equipment requiring stable component supply across multi-year production cycles.
Supply support for MMBZ18VAL-Q 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET components, with core expertise in ESD protection and automotive-qualified devices.
MMBZ18VAL-Q belongs to Nexperia's Automotive ESD Protection Diode product line, engineered specifically for robust, space-constrained transient suppression in safety-critical vehicle subsystems and high-speed digital interfaces.
FAQ
What is the maximum recommended PCB trace length between MMBZ18VAL-Q and the protected connector?
Per Nexperia application guidance, the trace from Pin 1 or Pin 2 to the protected line entry point must be ≤3 mm, and the common-anode (Pin 3) ground connection must route directly to a solid ground plane with minimal loop area. Longer traces increase inductance, degrading clamping response and allowing voltage overshoot beyond the 25 V spec.
Can MMBZ18VAL-Q protect bidirectional signal lines like RS-485 or CAN without external components?
No - MMBZ18VAL-Q is unidirectional only. For true bidirectional protection of RS-485 or CAN, a dedicated bidirectional TVS array (e.g., PESD5V0S1BA) or external series resistors + back-to-back diodes are required. Its common-anode structure inherently supports only positive-going transients on each cathode line.
Does the 30 kV ESD rating apply to both pins simultaneously or per pin?
The 30 kV rating applies individually to Pin 1-to-Pin 3 and Pin 2-to-Pin 3 under IEC 61000-4-2 contact discharge testing. Each diode leg is independently stressed during qualification - no derating is needed when protecting two lines concurrently in real-world use.
How does thermal resistance affect MMBZ18VAL-Q's surge handling in high-temperature ambient conditions?
At 100 °C ambient, junction temperature rise during a 40 W pulse is limited by Rth(j-a) = 460 K/W. Without forced cooling, sustained surges may exceed 150 °C junction limit. For repeated surge duty, use PCB copper pour under Pin 3 and minimize Rth(j-sp) via thermal vias to maintain reliability.
MMBZ18VAL-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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):
- 14.5V (Max)
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 70pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
MMBZ18VAL-QR FAQ
1.How can I place an order for MMBZ18VAL-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ18VAL-QR 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 MMBZ18VAL-QR reliable?
The price and inventory of MMBZ18VAL-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ18VAL-QR is usually 5 days.
3.What payment methods are accepted for MMBZ18VAL-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ18VAL-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ18VAL-QR?
MMBZ18VAL-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ18VAL-QR 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 MMBZ18VAL-QR?
For technical support, including MMBZ18VAL-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ18VAL-QR requirements.
6.How does Aetrix verify that MMBZ18VAL-QR is sourced from the original manufacturer or authorized distributors?
All MMBZ18VAL-QR 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 MMBZ18VAL-QR meets industry standards.
7.What is the process for return or replacement of MMBZ18VAL-QR?
All MMBZ18VAL-QR units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ18VAL-QR, 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 MMBZ18VAL-QR part is unused and in its original packaging.
Return procedure for MMBZ18VAL-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ18VAL-QR 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
-
ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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