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Taiwan Semiconductor Corporation SMBJ75
- Part No.:
- SMBJ75
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75.pdf
- Description:
- 600W, 92.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,972
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Product details
Overview
SMBJ75 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 75 V working stand-off voltage (VWM), 83.3–102 V breakdown voltage (VBR), 134 V maximum clamping voltage (VC) at 4.7 A peak impulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ75 datasheet, SMBJ75 pinout, SMBJ75 application, or SMBJ75 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 75 V, thermal resistance (RθJA = 55 °C/W), and compatibility with automated SMT placement on industrial and automotive PCBs.
Technical Context
The SMBJ75 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (83.3–102 V at 1 mA test current). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the DO-214AA package supports high surge current handling (4.7 A IPP) without thermal runaway under 10/1000 µs transients.
Designed for robust ESD and electrical fast transient (EFT) immunity per IEC 61000-4-2/4-4, it delivers consistent clamping at 134 V under full-rated surge, with junction temperature rated from –55 °C to +150 °C and moisture sensitivity level 1 - enabling use in reflow-soldered automotive and industrial control modules without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin. |
| VBR min/max | 83.3 / 102 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPP | 134 V @ 4.7 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPK | 600 W - Peak pulse power handling per single transient; meets ISO 7637-2 Pulse 5a requirements. |
| ID @ VWM | <1 µA - Ultra-low leakage at rated stand-off; prevents battery drain or signal distortion in always-on circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine bay or enclosed industrial enclosures. |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient; informs heatsinking needs for repeated surge events. |
Pinout & Package
DO-214AA (SMB) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads solderable per J-STD-002, polarity indicated by cathode band, weight ≈0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when VREV > VBR. |
| Anode | Reference/ground return | Typically tied to system ground plane; completes low-inductance surge path for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Sub-1 ps response time | Clamps ESD events before sensitive logic or analog circuitry sustains damage. |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b). |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant manufacturing. |
Applications
| Automotive Power Line Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rails and sensor supply lines against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp surges up to 134 V while maintaining <1 µA leakage. Use Value: Prevents failure of CAN transceivers and microcontrollers during ISO 7637-2 Pulse 5a events without affecting normal 24 V operation. | Use Scenario: Shielding digital input terminals of programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection device across 24 V DC inputs, absorbing repetitive EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity and eliminates false triggering during factory floor electrical noise events. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Protection |
Use Scenario: Safeguarding constant-current LED drivers in street lighting against lightning-induced line surges. IC Role / Device Role / Timing Role: Primary surge suppression element on 48 V input rail, clamping transients within 134 V limit. Use Value: Extends driver lifetime by preventing gate oxide rupture in MOSFET controllers during outdoor grid disturbances. | Use Scenario: Protecting isolated DC-DC converter primary-side rectifiers from reflected switching spikes. IC Role / Device Role / Timing Role: Fast-acting clamp on 12–48 V input, limiting voltage overshoot during MOSFET turn-off. Use Value: Reduces need for snubber networks and improves efficiency by eliminating parasitic ringing-induced losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A (Taiwan Semiconductor) | Lower VBR range (83.3–92.1 V), lower VC (121 V @ 5.2 A), tighter breakdown tolerance. | Better suited for precision-clamp designs where lower clamping voltage is critical and higher IPP is acceptable. | Select SMBJ75A when system-level testing shows 121 V clamping improves downstream component margin. |
| SMBJ75CA (Littelfuse) | Bidirectional variant; symmetric VBR (83.3–102 V) in both polarities; same VC (134 V) and PPK (600 W). | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, Ethernet PHY). | Choose SMBJ75CA only if bidirectional protection is mandated by interface standard or signal swing range. |
Compared with SMBJ75, SMBJ75A offers lower clamping voltage at slightly higher surge current, improving protection margin for voltage-sensitive loads; SMBJ75CA enables AC-capable protection but requires layout verification for dual-polarity surge paths.
Availability
SMBJ75 is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC input hardening, and LED driver overvoltage clamp applications requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMBJ75 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 industrial, automotive, and consumer markets.
The SMBJ series was developed specifically for high-reliability, surface-mount surge protection in harsh environments - emphasizing low leakage, tight VBR distribution, and ISO 7637-2 compliance for automotive-grade deployments.
FAQ
What is the maximum clamping voltage of SMBJ75 under standard 10/1000 µs surge conditions?
The SMBJ75 has a maximum clamping voltage (VC) of 134 V when subjected to its rated peak impulse current of 4.7 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25°C and guarantees that downstream components experience no more than 134 V during transient events, making SMBJ75 suitable for protecting 75 V-rated systems with appropriate safety margin.
Is SMBJ75 unidirectional or bidirectional, and how is polarity identified?
SMBJ75 is a unidirectional TVS diode, with polarity marked by a cathode band on the DO-214AA (SMB) package body. The banded end is the cathode and must be connected toward the protected line (e.g., VIN), while the anode connects to ground. Bidirectional variants require "C" or "CA" suffixes (e.g., SMBJ75C), which SMBJ75 does not carry.
Does SMBJ75 meet automotive surge immunity standards such as ISO 7637-2?
Yes, SMBJ75 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled transients), and Pulse 3b (battery connection bounce). Its 600 W peak power rating and verified clamping behavior under 10/1000 µs waveforms make it qualified for 12 V and 24 V automotive subsystems.
What is the leakage current specification for SMBJ75 at its working stand-off voltage?
At its working stand-off voltage (VWM) of 75 V and TA = 25°C, SMBJ75 exhibits a maximum blocking leakage current (ID) of 1 µA. This ultra-low leakage ensures minimal power loss in battery-backed or energy-sensitive applications and avoids false triggering in high-impedance sensing circuits.
Can SMBJ75 be used in automated SMT assembly processes without special handling?
Yes, SMBJ75 is optimized for automated placement: it carries moisture sensitivity level 1 per J-STD-020 (no dry-pack or baking required), features matte tin-plated leads compliant with J-STD-002 solderability, and uses a DO-214AA (SMB) outline compatible with standard pick-and-place feeders and reflow profiles.
SMBJ75 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 4.7A
- 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)
SMBJ75 FAQ
1.How can I place an order for SMBJ75 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75 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 SMBJ75 reliable?
The price and inventory of SMBJ75 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75 is usually 5 days.
3.What payment methods are accepted for SMBJ75?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75?
SMBJ75 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75 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 SMBJ75?
For technical support, including SMBJ75 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75 requirements.
6.How does Aetrix verify that SMBJ75 is sourced from the original manufacturer or authorized distributors?
All SMBJ75 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 SMBJ75 meets industry standards.
7.What is the process for return or replacement of SMBJ75?
All SMBJ75 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75, 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 SMBJ75 part is unused and in its original packaging.
Return procedure for SMBJ75:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ75 Tags
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