My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ8.0
- Part No.:
- SMBJ8.0
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.0.pdf
- Description:
- 600W, 9.9V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,290
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ8.0 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power lines and signal paths. It features a 8.0 V working stand-off voltage (VWM), 8.89–10.9 V breakdown voltage (VBR) at 1 mA test current, 15.0 V maximum clamping voltage (VC) at 42.0 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ8.0 datasheet, SMBJ8.0 pinout, SMBJ8.0 application, or SMBJ8.0 equivalent, key selection criteria include clamping performance under IEC 61000-4-5 surge conditions, leakage current ≤50 µA at VWM, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and thermal derating above 25°C ambient per RθJA = 55°C/W.
Technical Context
The SMBJ8.0 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with low capacitance and stable VBR tolerance. Its clamping behavior is defined by a 10/1000 µs waveform, delivering 15.0 V VC at 42.0 A IPP while maintaining <1 µA ID at 8.0 V VWM - critical for protecting low-voltage logic interfaces and automotive ECUs.
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, supporting automated SMT placement without lead finish concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before significant leakage begins; sets system-level overvoltage trip threshold. |
| VBR min/max | 8.89–10.9 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients without premature conduction. |
| VC @ IPP | 15.0 V @ 42.0 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs event; supports automotive load-dump and EFT immunity testing. |
| ID @ VWM | ≤50 µA - Reverse leakage at rated stand-off; preserves low-power standby integrity in battery-backed systems. |
| TJ max | +150°C - Maximum junction temperature; enables use in under-hood automotive environments with minimal heatsinking. |
| RθJA | 55°C/W - Junction-to-ambient thermal resistance; determines required PCB copper area for sustained power dissipation. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Surge return path | Connected to protected line (e.g., 12 V rail); conducts during positive transients when cathode is biased higher. |
| Cathode | Clamping reference / Ground reference | Connected to system ground or low-impedance return; establishes clamping voltage relative to reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| Response time <1.0 ps | Ensures sub-nanosecond reaction to ESD and EFT events, preventing damage to sensitive CMOS inputs before clamping activates. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive electronics protection against battery disconnect, inductive switching, and ignition noise in 12 V systems. |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow; supports standard SMT assembly without moisture-related popcorning risk. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export to regulated markets. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in body control modules (BCM) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp surges before they reach voltage regulators. Use Value: Limits clamped voltage to 15.0 V, ensuring downstream 16 V-rated LDOs remain within safe operating area during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding 4–20 mA analog sensor outputs from ESD coupling via field wiring in factory automation. IC Role / Device Role / Timing Role: Bidirectional protection (using SMBJ8.0A variant) across differential pair, referenced to local ground plane. Use Value: Sub-1 ns response prevents latch-up in precision op-amps; 15.0 V clamping avoids saturation of 24 V loop-powered receivers. |
| LED Driver Input Protection | USB Port ESD Suppression |
Use Scenario: Safeguarding constant-current LED drivers in outdoor signage from lightning-induced surges on 24 V DC input. IC Role / Device Role / Timing Role: Primary surge shunt on DC input rail, coordinated with upstream fuse and downstream bulk capacitor. Use Value: 600 W PPK rating handles multi-pulse surges; 8.0 V VWM allows compatibility with 24 V nominal systems using 12 V logic controllers. | Use Scenario: Adding secondary-level ESD protection on USB VBUS line in embedded host devices. IC Role / Device Role / Timing Role: Standoff diode placed after primary polyfuse, clamping fast transients before reaching USB controller PHY. Use Value: 15.0 V VC ensures USB 2.0 PHY (rated to 6 V) sees no more than 15 V peak - requires coordination with series impedance for full IEC 61000-4-2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A (Taiwan Semiconductor) | Narrower VBR range: 8.89–9.83 V vs. 8.89–10.9 V; lower VC = 13.6 V @ 46.0 A. | Better clamping margin for 5 V logic rails; tighter VBR improves predictability in low-tolerance designs. | Select SMBJ8.0A when lower clamping voltage and tighter breakdown tolerance are prioritized over cost or legacy BOM alignment. |
| SMAJ8.0 (ON Semiconductor) | Same DO-214AC (SMA) package; 600 W rating but higher RθJA = 65°C/W; VC = 15.0 V @ 42.0 A. | Lower power density due to smaller package; less thermal margin in high-ambient industrial enclosures. | Choose SMAJ8.0 only if footprint compatibility with existing SMA layouts is mandatory and thermal derating is verified. |
Compared with SMBJ8.0, the SMBJ8.0A offers superior clamping consistency for precision-sensitive circuits, while the SMAJ8.0 trades thermal performance for smaller footprint - neither is pin-compatible due to differing DO-214AA vs. DO-214AC packages, requiring PCB revision for substitution.
Availability
SMBJ8.0 is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and LED driver input protection requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ8.0 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer applications.
The SMBJ series was developed specifically for robust, high-energy transient suppression in 12 V and 24 V automotive and industrial systems, emphasizing low clamping voltage, fast response, and AEC-Q200 readiness.
FAQ
What is the maximum clamping voltage of SMBJ8.0 under standard 10/1000 µs surge conditions?
The SMBJ8.0 has a maximum clamping voltage (VC) of 15.0 V when subjected to a 42.0 A peak impulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ8.0 maintains this clamping performance across its specified operating temperature range, making it suitable for automotive and industrial applications where voltage margin is critical.
Is SMBJ8.0 suitable for bidirectional transient protection?
No, SMBJ8.0 is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications such as AC signal lines or differential buses, the SMBJ8.0A variant or bipolar part numbers with "C" or "CA" suffixes (e.g., SMBJ8.0C) must be used. Using SMBJ8.0 in reverse-biased configurations beyond its specified VWM risks permanent breakdown and failure.
What is the leakage current specification for SMBJ8.0 at its working stand-off voltage?
The SMBJ8.0 exhibits a maximum blocking leakage current (ID) of 50 µA when biased at its 8.0 V working stand-off voltage (VWM) and tested at TA = 25°C. This low leakage ensures minimal power loss in always-on systems and preserves battery life in portable or energy-harvesting applications where quiescent current is tightly constrained.
Does SMBJ8.0 meet automotive surge immunity standards?
Yes, SMBJ8.0 is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronic components. Its 600 W peak pulse power rating, fast <1.0 ps response, and stable clamping behavior make it appropriate for protecting ECUs, lighting modules, and infotainment systems against conducted transients from alternator load dump, inductive switching, and ignition noise.
What is the thermal resistance profile of SMBJ8.0 and how does it affect PCB layout?
SMBJ8.0 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W. To maintain TJ ≤ 150°C under 600 W surge conditions, PCB layout must provide adequate copper area - typically ≥ 100 mm² of 2 oz copper connected to both terminals - and avoid thermal isolation. Insufficient copper results in rapid junction temperature rise and potential thermal runaway during repetitive surges.
SMBJ8.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 42A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ8.0 FAQ
1.How can I place an order for SMBJ8.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.0 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 SMBJ8.0 reliable?
The price and inventory of SMBJ8.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.0 is usually 5 days.
3.What payment methods are accepted for SMBJ8.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.0?
SMBJ8.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.0 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 SMBJ8.0?
For technical support, including SMBJ8.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.0 requirements.
6.How does Aetrix verify that SMBJ8.0 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.0 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 SMBJ8.0 meets industry standards.
7.What is the process for return or replacement of SMBJ8.0?
All SMBJ8.0 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.0, 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 SMBJ8.0 part is unused and in its original packaging.
Return procedure for SMBJ8.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.0 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.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
