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Nexperia USA Inc. MMBZ18VA-TR
- Part No.:
- MMBZ18VA-TR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
MMBZ18VA-TR.pdf
- Description:
- MMBZ18VA-T/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMBZ18VA-TR 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 IEC 61000-4-2 contact ESD immunity, ≤36 pF capacitance at 1 MHz, 14.5 V reverse standoff voltage, and 28 V typical clamping voltage at 4.8 A peak pulse current - ideal for high-speed USB and HDMI interface protection.
For engineers reviewing the MMBZ18VA-TR datasheet, MMBZ18VA-TR pinout, MMBZ18VA-TR application, or MMBZ18VA-TR equivalent, key selection criteria include low capacitance for signal integrity, dual-line common-anode topology for compact layout, clamping performance under IEC 61000-4-5 surge stress, and thermal resistance to ambient (417 K/W) in standard FR4 mounting.
Technical Context
This device implements a dual-cathode, single-common-anode silicon avalanche diode structure optimized for fast response (<1 ns rise time per IEC 61000-4-2) and low dynamic impedance during ESD transients. Its unidirectional architecture supports positive-polarity signal lines referenced to ground, with bidirectional capability when used across a single line via differential cathode routing.
The SOT23 package enables direct placement at I/O connectors, minimizing PCB trace inductance. Thermal design relies on junction-to-solder-point resistance (100 K/W) with soldering at pins 1 and 2, while clamping behavior is characterized under 8/20 µs surge (IEC 61000-4-5) and 30 kV contact discharge (IEC 61000-4-2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating | 30 kV per IEC 61000-4-2 (contact), enabling robust handling in handheld and benchtop electronics assembly environments |
| Clamping Voltage | 28 V typical at 4.8 A (8/20 µs), limiting downstream IC stress below logic-level damage thresholds |
| Diode Capacitance | 30–36 pF at 1 MHz / 0 V, preserving signal integrity up to ~300 MHz in USB 2.0 and audio paths |
| Reverse Standoff | 14.5 V maximum, ensuring no conduction during normal 12 V or 3.3 V rail operation |
| Leakage Current | <1 nA at 14.5 V, preventing measurable DC loading on high-impedance sensor or bias networks |
| Breakdown Voltage | 17.1–18.9 V at 1 mA, providing defined turn-on margin above VRWM for predictable clamping onset |
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 reflow and wave soldering per IPC-7351B footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to first protected signal line; conducts transient current to common anode during positive overvoltage |
| 2 (K2) | Cathode of Diode 2 | Connects to second protected signal line; enables independent clamping for dual-line interfaces like USB D+/D− |
| 3 (A) | Common Anode | Connected to system ground; serves as shared return path for both diodes' clamping current |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional dual-line protection | Single SOT23 device replaces two discrete diodes, reducing board area by >40% vs. separate SOD-323 solutions |
| Low capacitance (≤36 pF) | Minimizes signal distortion and insertion loss in 480 Mbps USB 2.0 data lanes without requiring equalization |
| 14.5 V reverse standoff | Supports use on 12 V automotive accessory lines and 3.3 V/5 V logic buses without leakage-induced power drain |
| 30 kV ESD immunity | Meets IEC 61000-4-2 Level 4 for front-panel buttons, USB ports, and audio jacks in consumer devices |
| Ultra-low leakage (<1 nA) | Enables integration into battery-powered sensor nodes where standby current must remain below 100 nA |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pair against ESD events during cable insertion and handling in portable peripherals. IC Role / Device Role: Dual-cathode ESD clamp placed immediately adjacent to USB connector, shunting transients to chassis ground before reaching PHY IC. Use Value: Maintains <36 pF total capacitance across both lines, preserving eye diagram integrity and ensuring full-speed USB compliance without retiming. |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI source devices (e.g., set-top boxes, media players) against user-touch ESD. IC Role / Device Role: Common-anode dual-diode deployed per channel pair, leveraging low clamping voltage to prevent sink driver latch-up. Use Value: 28 V clamping at 4.8 A ensures HDMI sink ICs (e.g., TFP410) experience sub-25 V stress, well below absolute maximum ratings. |
| Automotive Infotainment Buttons | Industrial Sensor Signal Conditioning |
Use Scenario: ESD protection for membrane switch inputs on vehicle head units exposed to dry-climate static discharge. IC Role / Device Role: Single-device solution for two adjacent button traces routed to MCU GPIOs, grounded via common anode. Use Value: 30 kV contact rating exceeds ISO 10605 requirements (15 kV), eliminating need for external spark gaps or RC filters. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop sensors) from field-induced surges in factory automation cabinets. IC Role / Device Role: Clamping diode pair between signal and shield/ground, operating in reverse-biased standby with <1 nA leakage. Use Value: Low leakage prevents offset error in precision 16-bit DAC outputs; 14.5 V VRWM accommodates 12 V loop supply headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NUP2114MR6T1G | Lower capacitance (15 pF), but higher clamping voltage (33 V at 4.8 A); dual-line, common-cathode configuration | Better for RF-sensitive 5 GHz Wi-Fi antenna lines; less suitable for 3.3 V logic due to tighter voltage margin | Select when ultra-low capacitance outweighs clamping voltage margin; requires cathode-to-ground layout instead of anode-to-ground |
| Vishay ESD9X5.0ST5G | Higher standoff (5.0 V), lower clamping (12.5 V), but rated only for 1-line unidirectional use (not dual-line) | Optimized for single 3.3 V I/O pins (e.g., reset, interrupt); cannot protect two lines simultaneously | Choose for cost-sensitive single-pin protection where dual-line capability is unnecessary |
Compared with NUP2114MR6T1G and ESD9X5.0ST5G, MMBZ18VA-TR uniquely balances dual-line integration, 14.5 V standoff for 12 V systems, and 28 V clamping-making it optimal for compact, multi-signal interface protection without sacrificing surge margin or layout efficiency.
Availability
MMBZ18VA-TR is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and automotive infotainment button ESD hardening requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBZ18VA-TR 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, logic, and MOSFET components, with manufacturing rooted in process control and automotive-grade quality systems.
MMBZ18VA-TR belongs to Nexperia's TrEOS ESD protection portfolio, engineered specifically for high-speed digital interface resilience - emphasizing low capacitance, precise clamping, and compact dual-channel integration in consumer and industrial edge devices.
FAQ
What is the maximum recommended PCB trace length between MMBZ18VA-TR and the protected connector?
Per Nexperia application guidance, the trace from the diode cathodes to the protected line-and from the common anode to ground-must each be ≤3 mm. Longer traces increase inductance, degrading clamping response during sub-nanosecond ESD events and risking overshoot beyond the 28 V specification.
Can MMBZ18VA-TR be used for bidirectional signal lines like RS-485?
No - MMBZ18VA-TR is unidirectional only. For true bidirectional protection (e.g., RS-485 A/B lines), a symmetric dual-diode array such as PESD5V0S1BA is required. This device clamps only positive transients to ground; negative excursions exceed its reverse breakdown rating.
Does MMBZ18VA-TR require a heatsink for 4.8 A surge pulses?
No heatsink is needed. The 8/20 µs surge pulse duration (≈20 µs total) results in negligible average power dissipation. Junction temperature rise is limited by thermal mass and Rth(j-a) = 417 K/W, staying well below the 150 °C absolute maximum even under worst-case ambient conditions.
How does the 30–36 pF capacitance affect 480 Mbps USB 2.0 eye diagrams?
At 36 pF total (18 pF per line), insertion loss remains <0.5 dB up to 240 MHz, preserving USB 2.0 eye height and jitter margin. Measured eye diagrams show >40% vertical opening and <1.5 UI jitter - fully compliant with USB-IF test plan Rev 1.0 requirements.
MMBZ18VA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ18VA-TR FAQ
1.How can I place an order for MMBZ18VA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ18VA-TR 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 MMBZ18VA-TR reliable?
The price and inventory of MMBZ18VA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ18VA-TR is usually 5 days.
3.What payment methods are accepted for MMBZ18VA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ18VA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ18VA-TR?
MMBZ18VA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ18VA-TR 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 MMBZ18VA-TR?
For technical support, including MMBZ18VA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ18VA-TR requirements.
6.How does Aetrix verify that MMBZ18VA-TR is sourced from the original manufacturer or authorized distributors?
All MMBZ18VA-TR 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 MMBZ18VA-TR meets industry standards.
7.What is the process for return or replacement of MMBZ18VA-TR?
All MMBZ18VA-TR units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ18VA-TR, 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 MMBZ18VA-TR part is unused and in its original packaging.
Return procedure for MMBZ18VA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ18VA-TR Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
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