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Nexperia USA Inc. MMBZ18VAT-QR
- Part No.:
- MMBZ18VAT-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ18VAT-QR.pdf
- Description:
- MMBZ18VAT-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
MMBZ18VAT-Q from Nexperia is a unidirectional double ESD protection diode in common-anode SOT23 configuration, designed for transient suppression on two signal lines. It delivers 30 kV IEC 61000-4-2 contact ESD immunity, ≤36 pF capacitance at 1 MHz, 14.5 V reverse standoff voltage, and clamps to 28 V (typ.) at 4.8 A peak pulse current-used in automotive ECUs and high-speed USB/MIPI interfaces.
For engineers reviewing the MMBZ18VAT-Q datasheet, MMBZ18VAT-Q pinout, MMBZ18VAT-Q application, or MMBZ18VAT-Q equivalent, key selection criteria include low capacitance for signal integrity, AEC-Q101 qualification for automotive reliability, common-anode dual-cathode topology for compact two-line protection, and sub-1 nA leakage at VRWM.
Technical Context
This device implements a dual-diode common-anode structure enabling simultaneous unidirectional protection of two independent signal paths-or bidirectional protection of a single line-without external biasing. Its junction design achieves ultra-low capacitance (30–36 pF) and tight clamping (28 V typ. at 4.8 A), critical for preserving signal fidelity in high-frequency data lines.
Qualified per AEC-Q101, it supports operation from −55 °C to +150 °C ambient and features thermal resistance Rth(j-a) = 417 K/W (free air) and Rth(j-sp) = 100 K/W (solder point), enabling robust thermal performance in space-constrained automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | Common-anode dual-cathode unidirectional ESD diode |
| Reverse Standoff Voltage (VRWM) | 14.5 V - maximum continuous operating voltage before conduction |
| Clamping Voltage (VCL) | 28 V (typ.) at 4.8 A - limits transient voltage seen by protected IC |
| Diode Capacitance (Cd) | 30–36 pF at 1 MHz, 0 V - preserves signal integrity up to ~500 MHz |
| ESD Rating | ±30 kV IEC 61000-4-2 contact discharge - exceeds automotive system-level requirements |
| Leakage Current (IRM) | <1 nA at 14.5 V - negligible loading on low-power sensor or logic inputs |
| Peak Pulse Current (IPPM) | 4.8 A (8/20 µs waveform) - handles typical board-level surge events |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 × 1.3 × 1.0 mm body, optimized for automated placement and reflow soldering on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (cathode of diode 1) | Connects to first protected signal line; conducts during positive transients |
| 2 | K2 (cathode of diode 2) | Connects to second protected signal line; enables independent two-line protection |
| 3 | A (common anode) | Connected to system ground; provides shared return path for both clamping paths |
Key Features
| Feature | Design Value |
|---|---|
| Low capacitance | 30–36 pF enables use on USB 2.0, HDMI DDC, MIPI D-PHY, and other >100 Mbps interfaces without signal degradation |
| Common-anode dual-diode topology | Reduces component count vs. discrete diodes; simplifies layout for differential or adjacent signal pairs |
| AEC-Q101 qualification | Validated for automotive underhood and cabin modules with full temperature and lifetime stress testing |
| Sub-1 nA leakage | Prevents DC loading on high-impedance analog sensors, battery-monitoring inputs, or CMOS logic thresholds |
| 30 kV ESD immunity | Meets ISO 10605 and IEC 61000-4-2 Level 4 for system-level ESD robustness in production environments |
Applications
| Automotive ECU Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers and sensor interfaces in engine control units exposed to load dump and ESD events. IC Role / Device Role / Timing Role: ESD/surge clamp placed at connector entry point; operates passively with no timing impact on communication signals. Use Value: Prevents latch-up or permanent damage to transceivers while maintaining <15 pF effective capacitance per line due to common-anode layout. |
Use Scenario: Safeguarding D+ and D− lines of USB 2.0 ports in infotainment head units against hot-plug and user ESD. IC Role / Device Role / Timing Role: Bidirectional clamping via common-anode configuration; zero latency response to ±8 kV contact discharge. Use Value: Enables full-speed (480 Mbps) compliance without eye diagram distortion, verified per USB-IF test plan. |
| MIPI D-PHY Camera Interface | Industrial Sensor Signal Conditioning |
Use Scenario: Shielding high-speed camera data lanes (CLK, DATA0–DATA3) in ADAS vision modules from board-level transients. IC Role / Device Role / Timing Role: Unidirectional clamping on each lane relative to ground; maintains signal rise/fall times below 1 ns. Use Value: Achieves <0.5% bit error rate at 1.5 Gbps with 30 pF typical capacitance per cathode-to-ground path. |
Use Scenario: Protecting 4–20 mA loop-powered sensor outputs and analog front-end ADC inputs in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage (<1 nA) clamping prevents offset drift in precision current sensing circuits. Use Value: Maintains 16-bit measurement accuracy over −40 °C to +85 °C ambient with no calibration drift due to ESD-induced parametric shift. |
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 capacitance (55 pF), lower ESD rating (±15 kV), same SOT23-3 package and common-anode pinout | Not AEC-Q101 qualified; suitable for industrial but not automotive deployment | Select when cost sensitivity outweighs automotive qualification and high-speed signal integrity needs |
| Vishay ESDE0402MUT5G | Lower VRWM (5.5 V), higher leakage (50 nA), 0402 footprint (not SOT23); bidirectional only | Requires separate devices per line; unsuitable for 14.5 V rail or low-leakage analog sensing | Choose only for space-constrained 5 V logic interfaces where dual-line integration is secondary to board area |
Compared with NUP4201MR6T1G and ESDE0402MUT5G, the MMBZ18VAT-Q uniquely combines automotive qualification, sub-36 pF capacitance, and true dual-unidirectional capability in SOT23-enabling single-component protection for 12 V–14 V automotive data buses without compromising speed or reliability.
Availability
MMBZ18VAT-Q is available at Aetrix Electronics and suitable for automotive electronic control units, high-speed USB 2.0 interfaces, and MIPI D-PHY camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMBZ18VAT-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 essential efficiency, delivering high-performance, reliable discrete, logic, and MOSFET components for automotive, industrial, and consumer markets.
The MMBZ18VAT-Q belongs to Nexperia's Automotive-qualified ESD Protection Diode product line, engineered specifically for robust, low-capacitance transient suppression in safety-critical vehicle subsystems and high-data-rate interfaces.
FAQ
What is the maximum recommended PCB trace length between MMBZ18VAT-Q and the protected signal line?
Per Nexperia application guidance, the trace from the diode cathode to the protected line must be ≤3 mm, and the ground path from the common anode to the system ground plane must be direct and ≤5 mm. Longer traces increase inductance, degrading clamping performance above 100 MHz and risking overshoot beyond the 28 V spec.
Can MMBZ18VAT-Q protect bidirectional data lines like I²C without additional components?
Yes-the common-anode configuration allows bidirectional protection of a single line when both cathodes are tied to the same signal and the anode to ground. This meets I²C's open-drain requirement and clamps transients in both directions, provided VRWM ≥ 14.5 V exceeds the bus's maximum pull-up voltage.
Does MMBZ18VAT-Q require derating at elevated ambient temperatures?
Yes-peak pulse current must be reduced above 25 °C ambient. At 85 °C, IPPM derates to 3.2 A (67% of 4.8 A) per Nexperia's thermal derating curve. Junction temperature must remain ≤150 °C; use Rth(j-a) = 417 K/W to calculate power dissipation limits in actual board conditions.
How does the 30 kV IEC 61000-4-2 rating translate to real-world system-level robustness?
The 30 kV rating reflects ten non-repetitive contact discharges applied directly to the diode terminals. In system-level testing (e.g., ISO 10605), this enables the protected circuit to survive ≥15 kV discharges at the connector-even after 1000 cycles-provided layout guidelines (short traces, solid ground plane) are followed per Figure 6 of the datasheet.
MMBZ18VAT-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:
- 28V (Typ)
- Current - Peak Pulse (10/1000µs):
- 850mA
- Power - Peak Pulse:
- 20W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 30pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
MMBZ18VAT-QR FAQ
1.How can I place an order for MMBZ18VAT-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ18VAT-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 MMBZ18VAT-QR reliable?
The price and inventory of MMBZ18VAT-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ18VAT-QR is usually 5 days.
3.What payment methods are accepted for MMBZ18VAT-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ18VAT-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ18VAT-QR?
MMBZ18VAT-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ18VAT-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 MMBZ18VAT-QR?
For technical support, including MMBZ18VAT-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ18VAT-QR requirements.
6.How does Aetrix verify that MMBZ18VAT-QR is sourced from the original manufacturer or authorized distributors?
All MMBZ18VAT-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 MMBZ18VAT-QR meets industry standards.
7.What is the process for return or replacement of MMBZ18VAT-QR?
All MMBZ18VAT-QR units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ18VAT-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 MMBZ18VAT-QR part is unused and in its original packaging.
Return procedure for MMBZ18VAT-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ18VAT-QR Tags
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Diodes Incorporated
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Nexperia USA Inc.
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