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Nexperia USA Inc. MMBZ18VCL-QR
- Part No.:
- MMBZ18VCL-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ18VCL-QR.pdf
- Description:
- MMBZ18VCL-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,601
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Product details
Overview
MMBZ18VCL-Q from Nexperia is a unidirectional double ESD protection diode in common-cathode SOT23 configuration, designed for transient overvoltage suppression on up to two signal lines. It delivers 30 kV contact ESD immunity (IEC 61000-4-2 Level 4), clamps at ≤25 V under 1.6 A 10/1000 µs surge, and maintains ≤90 pF capacitance - enabling robust protection of high-speed USB, CAN, or LIN interfaces in automotive ECUs.
For engineers reviewing the MMBZ18VCL-Q datasheet, MMBZ18VCL-Q pinout, MMBZ18VCL-Q application, or MMBZ18VCL-Q equivalent, key selection criteria include its dual-line unidirectional topology, 14.5 V reverse standoff voltage, ultra-low 5 nA leakage, AEC-Q101 qualification, and SOT23 footprint compatibility with space-constrained PCB layouts.
Technical Context
This device implements a common-cathode dual-diode architecture where Pins 1 and 2 serve as independent anodes tied to separate signal lines, while Pin 3 provides a shared cathode connection to system ground. Its unidirectional conduction path enables precise polarity-aware clamping without bidirectional leakage trade-offs.
It meets IEC 61643-321 for 10/1000 µs surge handling and IEC 61000-4-2 Level 4 ESD immunity, with thermal resistance Rth(j-sp) = 60 K/W measured at the cathode solder point - confirming suitability for thermally demanding automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 14.5 V - Ensures no conduction during normal operation of 12 V automotive or 3.3 V/5 V logic lines. |
| Clamping Voltage (VCL) | ≤25 V at 1.6 A - Limits transient-induced voltage overshoot to safe levels for downstream 3.3 V or 5 V ICs. |
| Diode Capacitance (Cd) | 70–90 pF at 1 MHz - Preserves signal integrity on data lines up to ~100 Mbps (e.g., USB 2.0, CAN FD). |
| ESD Rating | 30 kV contact discharge - Exceeds IEC 61000-4-2 Level 4, eliminating need for external pre-filtering in most ECU ports. |
| Peak Pulse Power (PPPM) | 40 W - Sustains 10/1000 µs surges per IEC 61643-321 without degradation. |
| Leakage Current (IRM) | ≤5 nA at 14.5 V - Prevents DC loading or battery drain in always-on automotive modules. |
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 FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | Anode of Diode 1 | Connects to first protected signal line (e.g., CAN_H); conducts only when line voltage exceeds VRWM + VF. |
| 2 (A2) | Anode of Diode 2 | Connects to second protected signal line (e.g., CAN_L); operates independently but shares cathode return path. |
| 3 (CC) | Common Cathode | Single ground reference point for both diodes; minimizes ground loop area and ensures consistent clamping reference. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional dual-line protection | Enables independent ESD clamping on two positive-referenced signals (e.g., differential bus pairs) without cross-talk or reverse-bias leakage. |
| AEC-Q101 qualification | Validated for automotive use across −55 °C to +150 °C junction temperature, including temperature cycling, HTRB, and ESD stress testing. |
| Low 70–90 pF capacitance | Minimizes signal rise-time degradation and reflection on high-speed serial links, supporting >100 Mbps data rates. |
| 40 W peak pulse power rating | Handles repetitive 10/1000 µs transients per ISO 7637-3 without parameter shift or failure. |
| Ultra-low 5 nA leakage | Eliminates measurable current draw in sleep-mode vehicle networks (e.g., LIN standby), preserving battery life. |
Applications
| Automotive ECU Protection | CAN/LIN Bus Interface |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and transceiver pins in engine control units exposed to load dump and ESD events. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed at connector entry point before signal conditioning circuitry. Use Value: Maintains functional safety integrity by limiting clamped voltage to ≤25 V during 1.6 A surges, preventing latch-up or gate oxide damage in 3.3 V MCUs. |
Use Scenario: Shielding CAN_H and CAN_L lines in body control modules against cable-discharge events and ISO 10605 pulses. IC Role / Device Role / Timing Role: Dual-anode clamp providing matched clamping thresholds and low inter-line capacitance for differential signaling integrity. Use Value: Enables <100 ps skew between channels due to matched diode characteristics and shared cathode, preserving CAN bit timing margins. |
| USB 2.0 Port Protection | Audio Line Input Protection |
Use Scenario: Safeguarding USB D+ and D− lines in infotainment head units against hot-plug ESD and electrostatic coupling. IC Role / Device Role / Timing Role: Low-capacitance shunt protector placed directly at USB receptacle, minimizing trace inductance. Use Value: 70–90 pF capacitance avoids signal integrity loss at 480 Mbps, meeting USB 2.0 eye diagram mask requirements. |
Use Scenario: Protecting analog audio inputs (e.g., AUX, microphone) in car stereos from user-hand ESD and RF rectification. IC Role / Device Role / Timing Role: High-impedance DC blocker that remains non-conductive below 14.5 V, avoiding audio path distortion. Use Value: ≤5 nA leakage prevents DC offset accumulation in AC-coupled amplifier stages, eliminating audible pop/click artifacts. |
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 | Bidirectional dual-diode (common-anode), higher 120 pF capacitance, lower 20 kV ESD rating. | Requires symmetric signal swing; less suitable for unidirectional 12 V automotive buses. | Select only if protecting bidirectional lines like I²C or SMBus where polarity reversal occurs. |
| Vishay ESDE0402MUT5G | Single-line device (SOD-523), 15 pF capacitance, 12 V VRWM, not AEC-Q101 qualified. | Lacks dual-line integration; requires two devices and extra PCB area for same function. | Prefer for ultra-high-speed (>1 Gbps) applications where sub-20 pF is mandatory, and automotive qualification is not required. |
Compared with NUP4201MR6T1G and ESDE0402MUT5G, MMBZ18VCL-Q uniquely combines AEC-Q101 compliance, common-cathode unidirectional topology, and 70–90 pF capacitance - making it the optimal single-device solution for cost-sensitive, space-constrained automotive CAN, LIN, and USB 2.0 protection.
Availability
MMBZ18VCL-Q is available at Aetrix Electronics and suitable for automotive electronic control units, industrial communication interfaces, and portable consumer electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ18VCL-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 discrete and logic devices, with leadership in ESD protection, MOSFETs, and bipolar transistors.
This device belongs to Nexperia's Automotive-qualified ESD Protection Diode product line, engineered specifically for robust transient suppression in harsh automotive environments while maintaining signal fidelity on high-speed data lines.
FAQ
What is the maximum operating temperature for MMBZ18VCL-Q in continuous use?
The MMBZ18VCL-Q supports continuous operation up to 150 °C junction temperature, validated per AEC-Q101 thermal cycling and high-temperature reverse bias tests. Its Rth(j-sp) of 60 K/W at the cathode pin ensures reliable heat dissipation when mounted on standard FR4 PCBs with appropriate copper pour.
Can MMBZ18VCL-Q protect bidirectional signal lines like I²C?
No - MMBZ18VCL-Q is unidirectional and configured for positive-going transients only. For bidirectional lines such as I²C, a bidirectional dual-diode like NUP4201MR6T1G or a dedicated bidirectional array is required to clamp both positive and negative excursions relative to ground.
How does the common-cathode configuration affect PCB layout?
The common-cathode design mandates a single low-inductance ground connection at Pin 3, reducing ground loop area and ensuring identical clamping reference for both protected lines. Layout best practice requires placing the device within 3 mm of the connector and routing both anode traces symmetrically to the cathode pad.
Is MMBZ18VCL-Q compatible with lead-free reflow soldering profiles?
Yes - the SOT23 package is qualified for standard JEDEC J-STD-020 lead-free reflow profiles, with peak temperatures up to 260 °C. The recommended solder paste stencil aperture is 0.6 mm × 0.6 mm per pad, and wave soldering footprints specify 1.4 mm × 1.4 mm land dimensions per terminal.
MMBZ18VCL-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
MMBZ18VCL-QR FAQ
1.How can I place an order for MMBZ18VCL-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ18VCL-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 MMBZ18VCL-QR reliable?
The price and inventory of MMBZ18VCL-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ18VCL-QR is usually 5 days.
3.What payment methods are accepted for MMBZ18VCL-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ18VCL-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ18VCL-QR?
MMBZ18VCL-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ18VCL-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 MMBZ18VCL-QR?
For technical support, including MMBZ18VCL-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ18VCL-QR requirements.
6.How does Aetrix verify that MMBZ18VCL-QR is sourced from the original manufacturer or authorized distributors?
All MMBZ18VCL-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 MMBZ18VCL-QR meets industry standards.
7.What is the process for return or replacement of MMBZ18VCL-QR?
All MMBZ18VCL-QR units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ18VCL-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 MMBZ18VCL-QR part is unused and in its original packaging.
Return procedure for MMBZ18VCL-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ18VCL-QR 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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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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Diodes Incorporated
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