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Taiwan Semiconductor Corporation SMBJ100
- Part No.:
- SMBJ100
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ100.pdf
- Description:
- 600W, 123.5V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
SMBJ100 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 100V working stand-off voltage (VWM), 111–136V breakdown voltage (VBR), 179V maximum clamping voltage (VC) at 3.5A peak pulse current, and 600W peak pulse power rating with <1.0ps response time - deployed in automotive power supply inputs and industrial PLC I/O modules.
For engineers reviewing the SMBJ100 datasheet, SMBJ100 pinout, SMBJ100 application, or SMBJ100 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional polarity marking, DO-214AA (SMB) package thermal performance (RθJA = 55°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMBJ100 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 111–136V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR and low leakage (<1μA at 100V), while fast sub-picosecond response enables suppression of ESD and lightning-induced surges before downstream components are stressed.
Thermally, it supports 150°C max junction temperature and dissipates up to 3W steady-state power, with RθJC = 10°C/W enabling effective heat transfer to PCB copper. The device is rated for 100A non-repetitive forward surge (8.3ms half-sine) and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 111V / 136V @ 1mA - defines guaranteed avalanche onset window for design margining |
| VC @ IPP | 179V @ 3.5A - clamping voltage during 10/1000µs surge, limiting stress on protected ICs |
| PPK | 600W - peak impulse power handling per single 10/1000µs waveform |
| IR @ VWM | <1µA - ultra-low leakage preserves battery life and signal integrity in high-impedance circuits |
| VF @ 50A | 5.0V - forward voltage drop under high-current surge conduction, critical for unidirectional energy diversion |
| RθJA | 55°C/W - junction-to-ambient thermal resistance determines required PCB copper area for thermal management |
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; moisture sensitivity level 1 (per J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12V rail); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh environments |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Sub-1ps response time | Clamps ESD and fast transients before propagation into sensitive analog or digital circuitry |
| UL 94V-0 molding compound | Prevents flame propagation in enclosed industrial enclosures and automotive junction boxes |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance requirements for end-product certification |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 100V while remaining inactive below. Use Value: Limits voltage seen by LDOs and microcontrollers to ≤179V, preventing latch-up or gate oxide rupture during 100V+ transients. | Use Scenario: 24V digital input channels on programmable logic controllers subject to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protector on field-side input traces, absorbing repetitive 600W spikes without degradation. Use Value: Enables >100,000 surge cycles with <5% VBR shift, extending field reliability beyond 10 years in factory automation. |
| LED Driver Output Protection | Telecom DC Power Feed Protection |
Use Scenario: Constant-current LED driver outputs driving long cables susceptible to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional clamping not required; unidirectional SMBJ100 placed anode-to-ground protects against negative-going transients only. Use Value: Prevents catastrophic failure of MOSFET switches and current-sense amplifiers by clamping to 179V within 1ps. | Use Scenario: -48V telecom power feed lines entering remote radio units exposed to AC-coupled surges and EFT bursts. IC Role / Device Role / Timing Role: Reverse-connected SMBJ100 (cathode to -48V rail) clamps positive transients to ground. Use Value: Maintains system uptime by surviving 10/1000µs surges up to 600W without parametric shift or leakage increase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100A | Narrower VBR range (111–123V) and lower clamping voltage (162V @ 3.8A); tighter tolerance improves margin control | Better suited for systems with narrow VDD tolerance where 179V clamping is marginal | Select SMBJ100A when protected IC absolute maximum rating is <185V and tighter VBR consistency is required |
| SMCJ100 | Same VWM/VBR specs but larger DO-214AB (SMC) package; higher PPK (1500W) and lower RθJA (35°C/W) | Used where higher surge repetition rate or better thermal dissipation is needed | Choose SMCJ100 only if board layout allows larger footprint and thermal budget demands >600W single-pulse handling |
Compared with SMBJ100A, the SMBJ100 offers wider VBR tolerance and slightly higher clamping - advantageous where cost and standardization across voltage grades are priorities; versus SMCJ100, SMBJ100 trades power handling and thermal performance for compact DO-214AA size and automated placement compatibility.
Availability
SMBJ100 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and telecom power feeds requiring stable component supply and ISO 7637-2 compliance.
Supply support for SMBJ100 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, automotive, and consumer markets since 1979.
The SMBJ series was developed specifically for surface-mount surge protection in space-constrained, high-reliability applications - emphasizing low clamping ratio, fast response, and robustness against repetitive transients in automotive and industrial environments.
FAQ
What is the maximum clamping voltage of SMBJ100 under standard 10/1000µs surge conditions?
The SMBJ100 has a maximum clamping voltage (VC) of 179V at 3.5A peak pulse current under the standard 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMBJ100 suitable for bidirectional transient suppression?
No, SMBJ100 is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, TSC specifies SMBJ100C or SMBJ100CA variants - the SMBJ100 itself lacks symmetrical breakdown characteristics and must be installed with cathode toward the protected line and anode to ground.
What is the forward voltage drop of SMBJ100 during high-current surge conduction?
The SMBJ100 exhibits a forward voltage (VF) of 5.0V at 50A, per the manufacturer's absolute maximum ratings table. This VF value applies only during unidirectional forward conduction (e.g., during positive-going surges on a reverse-biased configuration) and directly impacts power dissipation and thermal stress during surge events.
Does SMBJ100 meet automotive transient immunity standards?
Yes, SMBJ100 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a/3b (capacitive coupling and ignition noise), as explicitly stated in the product features. This makes it suitable for 12V/24V automotive electronic control units and body electronics.
What is the thermal resistance from junction to ambient for SMBJ100 in standard mounting?
The SMBJ100 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single-layer 1-inch² copper pad). This value assumes no additional thermal vias or heatsinking - designers must verify actual board layout thermal performance using IR imaging or simulation when operating near 150°C junction limits.
SMBJ100 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 179V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
SMBJ100 FAQ
1.How can I place an order for SMBJ100 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ100 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 SMBJ100 reliable?
The price and inventory of SMBJ100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ100 is usually 5 days.
3.What payment methods are accepted for SMBJ100?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ100 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ100?
SMBJ100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ100 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 SMBJ100?
For technical support, including SMBJ100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ100 requirements.
6.How does Aetrix verify that SMBJ100 is sourced from the original manufacturer or authorized distributors?
All SMBJ100 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 SMBJ100 meets industry standards.
7.What is the process for return or replacement of SMBJ100?
All SMBJ100 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ100, 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 SMBJ100 part is unused and in its original packaging.
Return procedure for SMBJ100:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ100 Tags
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