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Taiwan Semiconductor Corporation SMBJ150A
- Part No.:
- SMBJ150A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ150A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:12,044
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Product details
Overview
SMBJ150A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 150 V working stand-off voltage (VWM), 167–185 V breakdown voltage (VBR), 243 V maximum clamping voltage (VC) at 2.5 A peak impulse current, and 600 W peak pulse power rating with sub-1 ps response time - deployed in automotive body control modules to suppress load-dump transients.
For engineers reviewing the SMBJ150A datasheet, SMBJ150A pinout, SMBJ150A application, or SMBJ150A equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD rails, leakage current below 1 µA at 150 V, DO-214AA (SMB) package compatibility with automated SMT assembly, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b test waveforms.
Technical Context
The SMBJ150A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (167–185 V at 1 mA test current). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at VWM = 150 V), while thermal resistance of 55 °C/W (junction-to-ambient) supports operation up to +150 °C junction temperature.
It delivers 243 V clamping voltage at 2.5 A peak impulse current under 10/1000 µs waveform, enabling robust protection of 150 V-rated systems against ESD, EFT, and inductive switching surges without forward conduction during normal operation due to its unidirectional polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's steady-state DC rail. |
| VBR min/max | 167 / 185 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on above system overvoltage threshold with tight process control. |
| VC @ IPP | 243 V @ 2.5 A (10/1000 µs) - Clamping voltage defines worst-case stress on downstream components during surge events. |
| PPK | 600 W - Peak pulse power handling capacity determines survivability against standardized ISO 7637-2 transients. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| Response time | <1.0 ps - Enables suppression of fast-rising ESD and EFT pulses before sensitive logic or analog stages are damaged. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline compatible with IPC-7351B footprint and J-STD-002 solderability requirements. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.090 g weight, UL 94V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to system ground or low-voltage return; enables unidirectional clamping from cathode to anode during overvoltage. |
| Cathode | Protected line input / high-side connection | Connected to the line being protected (e.g., 150 V supply rail); reverse-biased under normal operation, avalanches during surge. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance across temperature and lifetime, critical for automotive-grade reliability in -55°C to +150°C environments. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT), meeting OEM-level EMC requirements. |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing cost and avoiding moisture-induced popcorning during assembly. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, supporting green electronics initiatives and end-of-life recycling. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 150 V DC bus in vehicle body control units from load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between fused battery feed and downstream DC-DC converter input. Use Value: Limits transient voltage to ≤243 V, preventing damage to 200 V-rated MOSFETs and gate drivers while maintaining <1 µA leakage during quiescent operation. |
Use Scenario: Safeguarding 24–150 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at connector entry point, upstream of optocoupler or Schmitt trigger interface. Use Value: Sub-1 ps response captures fast EFT bursts before propagation into logic circuitry; DO-214AA footprint allows dense PCB layout near connectors. |
| LED Streetlight Driver Input | Telecom Power Feeds |
Use Scenario: Shielding constant-current LED driver inputs from lightning-induced surges on outdoor AC/DC power feeds. IC Role / Device Role / Timing Role: First-line transient absorber on bulk capacitor input stage, coordinated with MOV and fuse. Use Value: 600 W PPK rating handles multi-kA induced surges; 150 V VWM matches nominal 120–150 VDC output of off-line rectifiers. |
Use Scenario: Protecting 48 V telecom power distribution boards from hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Secondary clamping device after primary GDT/MOV, providing precise low-leakage voltage limiting. Use Value: 243 V clamping voltage provides safe margin above 48 V nominal with headroom for ripple and tolerance; RoHS/halogen-free compliance meets Telcordia GR-1089-CORE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ150A | Same DO-214AC (SMA) package; 243 V VC @ 2.5 A; slightly higher RθJA (65 °C/W vs. 55 °C/W). | Lower power density due to larger thermal resistance; requires more board area for equivalent thermal performance. | Select SMAJ150A only if existing design uses SMA footprint and thermal derating margins allow. |
| ON Semiconductor 1.5SMC150A | DO-214AB (SMC) package; 243 V VC @ 2.5 A; same 600 W rating but 0.12 g mass and 10% larger footprint. | Higher mounting height may conflict with enclosure clearance; better heat dissipation via larger copper pad area. | Choose 1.5SMC150A when board layout permits SMC size and enhanced thermal management is prioritized over space constraints. |
Compared with SMAJ150A and 1.5SMC150A, the SMBJ150A offers optimal balance of compact DO-214AA footprint, industry-leading 55 °C/W thermal resistance, and verified ISO 7637-2 compliance - making it preferred for space-constrained automotive and industrial modules where leakage, response speed, and assembly compatibility are critical.
Availability
SMBJ150A is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, LED streetlight driver input, and telecom power feed applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ150A 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, with ISO/TS 16949-certified production facilities.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low leakage, tight VBR tolerance, and full ISO 7637-2 waveform compliance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMBJ150A under standard test conditions?
The SMBJ150A has a maximum clamping voltage (VC) of 243 V when subjected to a 10/1000 µs surge waveform at 2.5 A peak impulse current. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ150A achieves this while maintaining <1 µA leakage at its 150 V working stand-off voltage.
Is SMBJ150A suitable for bidirectional transient protection?
No, SMBJ150A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking. It conducts only during reverse overvoltage events and blocks forward current - making it appropriate for DC power line protection where polarity is fixed. For bidirectional protection (e.g., AC lines or data buses), SMBJ150CA or equivalent bipolar variants must be used instead of SMBJ150A.
Does SMBJ150A meet automotive EMC standards?
Yes, SMBJ150A is explicitly validated to meet ISO 7637-2 Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (electrical fast transients), as stated in Taiwan Semiconductor's official documentation. Its 600 W peak pulse power rating, sub-1 ps response time, and controlled clamping behavior make it suitable for Tier-1 automotive subsystems including body control modules and lighting drivers - provided layout follows recommended grounding and trace length guidelines.
What is the thermal resistance profile of SMBJ150A?
The SMBJ150A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case resistance (RθJC) of 10 °C/W, measured under standard JEDEC conditions. These values enable reliable operation up to +150 °C junction temperature when mounted on 1-inch² 1 oz copper with two thermal vias - essential for sustained surge duty cycles in enclosed industrial enclosures. The DO-214AA package's low 0.090 g mass also minimizes thermal inertia during transient events.
How does SMBJ150A compare to SMBJ150 in terms of electrical performance?
SMBJ150A offers tighter breakdown voltage tolerance (167–185 V) versus SMBJ150 (167–204 V), resulting in more predictable clamping onset and reduced risk of premature conduction. Both share identical 150 V VWM, 243 V/266 V clamping voltages, and 600 W PPK rating, but SMBJ150A's lower max VBR improves margin for systems with narrow overvoltage windows. The "A" suffix denotes enhanced VBR uniformity - a key differentiator for precision protection in safety-critical applications.
SMBJ150A 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):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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)
SMBJ150A FAQ
1.How can I place an order for SMBJ150A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ150A 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 SMBJ150A reliable?
The price and inventory of SMBJ150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ150A is usually 5 days.
3.What payment methods are accepted for SMBJ150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ150A?
SMBJ150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ150A 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 SMBJ150A?
For technical support, including SMBJ150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ150A requirements.
6.How does Aetrix verify that SMBJ150A is sourced from the original manufacturer or authorized distributors?
All SMBJ150A 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 SMBJ150A meets industry standards.
7.What is the process for return or replacement of SMBJ150A?
All SMBJ150A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ150A, 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 SMBJ150A part is unused and in its original packaging.
Return procedure for SMBJ150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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