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onsemi NSPM8181MUTBG
- Part No.:
- NSPM8181MUTBG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
NSPM8181MUTBG.pdf
- Description:
- TVS DIODE 18VWM 30VC 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
NSPM8181MUTBG from onsemi is a unidirectional ESD and surge protection diode designed for 18 V supply rail clamping in high-reliability interfaces. It delivers ±30 kV IEC 61000-4-2 contact ESD protection, clamps at 28 V under 119 A (8/20 µs), and features 18 V working peak reverse voltage with <1 µA leakage at VRWM - used in USB 2.0 data lines, HDMI hot-plug circuits, and industrial sensor I/O protection.
For engineers reviewing the NSPM8181MUTBG datasheet, pinout, applications, or equivalent options, key selection criteria include verified 119 A surge current rating, UDFN6 package thermal performance, grounded die attach pad implementation, and compatibility with 18 V DC-biased signal paths requiring low-leakage transient suppression.
Technical Context
This device implements a single-channel unidirectional Zener-based clamping structure optimized for supply rail protection. Its breakdown voltage is specified at 20–23.5 V (min/nom/max) with 1 mA test current, and clamping occurs at 28 V under full 119 A 8/20 µs surge - meeting IEC 61000-4-5 Level 4 lightning immunity requirements.
The UDFN6 package integrates an exposed die attach pad (DAP) that must be connected to ground for optimal thermal dissipation and ESD path integrity. Pin 1 (VCC) serves as the high-voltage anode input, while pins 5 and 6 are dedicated ground terminals - enabling low-inductance return paths critical for sub-nanosecond transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18 V - maximum continuous DC operating voltage before clamping initiates |
| VBR (min/nom/max) | 20 / 22.5 / 23.5 V @ 1 mA - defines precise turn-on threshold for overvoltage detection |
| VC @ IPP | 28 V @ 119 A (8/20 µs) - clamping voltage during worst-case lightning surge event |
| IPP | 119 A - peak pulse current capability per IEC 61000-4-5 waveform compliance |
| ESD Rating | ±30 kV contact discharge per IEC 61000-4-2 Level 4 - validated system-level ESD robustness |
| IR @ VRWM | <1 µA - ensures negligible standby power loss in battery-powered or low-power sensor nodes |
Pinout & Package
The NSPM8181MUTBG is housed in a 6-lead UDFN package (Case 517CS), measuring 1.8 mm × 2.0 mm × 0.55 mm with 0.4 mm pitch and an exposed die attach pad (DAP) on the bottom surface requiring PCB ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Anode input | High-voltage input terminal connected to protected supply rail or signal line |
| 2, 3, 4 (N/C) | No connect | Internally unconnected; must remain floating - no PCB trace or copper pour |
| 5 (GND) | Ground return | Primary low-inductance ground path for ESD current; connects to DAP via internal bond |
| 6 (GND) | Ground return | Secondary ground terminal enhancing current sharing and thermal spreading to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables DC-biased protection without forward conduction on signal lines during normal operation |
| Exposed DAP with ground requirement | Reduces thermal resistance by >40% vs. standard UDFN, supporting repeated 119 A surges without degradation |
| 18 V VRWM with tight VBR tolerance | Allows direct placement on 18 V rails without derating; eliminates need for series resistors in many applications |
| Pb-free and RoHS-compliant construction | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C |
Applications
| USB 2.0 Port Protection | HDMI Hot-Plug Detection |
|---|---|
Use Scenario: Protecting D+ and D− lines against ESD events during cable insertion/removal in embedded host controllers. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and PHY IC. Use Value: Maintains signal integrity with <1 µA leakage while clamping transients to 28 V - preventing PHY latch-up or damage. | Use Scenario: Safeguarding HPD (Hot Plug Detect) and DDC lines in HDMI source devices exposed to user-handled connectors. IC Role / Device Role / Timing Role: Rail clamp on 5 V or 18 V auxiliary supply lines feeding HDMI controller logic. Use Value: Withstands ±30 kV contact ESD and 119 A lightning surges without compromising HPD edge timing or DDC bus reliability. |
| Industrial Sensor I/O Protection | Automotive Body Control Module Inputs |
Use Scenario: Shielding analog and digital inputs of temperature/pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: Primary overvoltage protector on 12–24 V supply rails feeding sensor signal conditioning circuitry. Use Value: Clamps 119 A surges to 28 V while operating across –55 °C to +125 °C - ensuring uptime in harsh environments. | Use Scenario: Protecting LIN bus or discrete switch inputs in BCMs subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary surge limiter downstream of primary TVS, handling localized ESD near connectors. Use Value: Low leakage (<1 µA) prevents false triggering of wake-up circuits; 18 V VRWM matches common 12 V system bias with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | DO-214AC package; 18 V VRWM; 100 A IPP; higher clamping voltage (32.4 V) | Larger footprint; less suitable for space-constrained USB/HDMI layouts | Preferred where board area is available and higher clamping voltage is acceptable |
| NSPM8151MUTBG | Same UDFN6 package; 15 V VRWM; 100 A IPP; lower clamping (27 V) | Better fit for 12–15 V rails; not rated for 18 V continuous operation | Select when protecting 12 V or 15 V supplies with tighter clamping and identical layout |
Compared with SMAJ18A and NSPM8151MUTBG, the NSPM8181MUTBG uniquely balances 18 V rail compatibility, 119 A surge capacity, and ultra-compact UDFN6 packaging - making it optimal for next-generation portable and automotive interface designs requiring both high energy handling and minimal PCB real estate.
Availability
NSPM8181MUTBG is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI hot-plug circuits, and industrial sensor I/O requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for NSPM8181MUTBG 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NSPM8181MUTBG belongs to onsemi's transient voltage suppression portfolio, engineered specifically for high-density, high-reliability interface protection in space-constrained consumer and industrial electronics.
FAQ
What is the maximum continuous operating voltage for NSPM8181MUTBG?
The NSPM8181MUTBG has a working peak reverse voltage (VRWM) of 18 V, meaning it can safely operate on DC supply rails up to 18 V without entering conduction. This value is confirmed in Table 2 of the official onsemi datasheet and is critical for selecting appropriate overvoltage protection without false triggering during normal operation. Exceeding 18 V may cause premature clamping or degradation.
Does NSPM8181MUTBG require grounding of the die attach pad?
Yes, the exposed die attach pad (DAP) on the bottom of the NSPM8181MUTBG UDFN6 package must be soldered to a PCB ground plane. This connection is essential for thermal dissipation during 119 A surge events and provides a low-inductance return path for ESD current. The datasheet explicitly states "DAP - connect to ground" in the application diagram and mechanical drawings.
How does NSPM8181MUTBG compare to NSPM8151MUTBG in surge handling?
The NSPM8181MUTBG supports 119 A peak pulse current (8/20 µs), whereas NSPM8151MUTBG is rated for 100 A under the same waveform. Both share identical UDFN6 packaging and ESD ratings, but the NSPM8181MUTBG's higher IPP reflects its optimization for more demanding surge environments - such as industrial fieldbus nodes or automotive body electronics exposed to load dump transients.
Can NSPM8181MUTBG be used on bidirectional signal lines like RS-485?
No, NSPM8181MUTBG is strictly unidirectional and unsuitable for bidirectional differential buses. Its internal Zener structure conducts only from anode (pin 1) to ground (pins 5/6). For RS-485 or CAN, a bidirectional TVS such as NUP4105MR6T1G or SMBJ15CA would be required. Using NSPM8181MUTBG on bidirectional lines risks forward conduction during negative transients and signal distortion.
What is the leakage current specification for NSPM8181MUTBG at 18 V?
The NSPM8181MUTBG exhibits a maximum reverse leakage current (IR) of 1 µA at its rated VRWM of 18 V, measured at 25 °C ambient. This low leakage ensures minimal impact on battery life in portable systems and avoids loading sensitive reference or bias networks - a key advantage over higher-leakage alternatives like SMAJ-series diodes, which typically specify 5–10 µA at VRWM.
NSPM8181MUTBG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 6-UFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 30V
- Current - Peak Pulse (10/1000µs):
- 100A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UDFN (1.8x2)
NSPM8181MUTBG FAQ
1.How can I place an order for NSPM8181MUTBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NSPM8181MUTBG 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 NSPM8181MUTBG reliable?
The price and inventory of NSPM8181MUTBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NSPM8181MUTBG is usually 5 days.
3.What payment methods are accepted for NSPM8181MUTBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NSPM8181MUTBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NSPM8181MUTBG?
NSPM8181MUTBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NSPM8181MUTBG 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 NSPM8181MUTBG?
For technical support, including NSPM8181MUTBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NSPM8181MUTBG requirements.
6.How does Aetrix verify that NSPM8181MUTBG is sourced from the original manufacturer or authorized distributors?
All NSPM8181MUTBG 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 NSPM8181MUTBG meets industry standards.
7.What is the process for return or replacement of NSPM8181MUTBG?
All NSPM8181MUTBG units undergo pre-shipment inspection (PSI). If there is an issue with NSPM8181MUTBG, 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 NSPM8181MUTBG part is unused and in its original packaging.
Return procedure for NSPM8181MUTBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NSPM8181MUTBG 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.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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