My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ75A
- Part No.:
- SMBJ75A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,975
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ75A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 75V working stand-off voltage (VWM), 83.3–92.1V breakdown voltage (VBR), and 121V maximum clamping voltage (VC) at 5.2A peak impulse current - designed for automotive load-dump and inductive switching protection in power supply rails and DC input stages.
For engineers reviewing the SMBJ75A datasheet, SMBJ75A pinout, SMBJ75A application, or SMBJ75A equivalent, key selection criteria include clamping performance under 10/1000µs surge, low leakage (<1µA @ 75V), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal derating capability up to +150°C junction temperature.
Technical Context
The SMBJ75A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (83.3–92.1V @ 1mA), clamping transients to ≤121V within <1.0ps response time. Its glass-passivated junction ensures stable breakdown and low leakage (<1µA @ VWM = 75V).
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, supporting 3W steady-state dissipation at 25°C ambient and derated operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR @ IT=1mA | 83.3–92.1 V - Verified avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPP=5.2A | 121 V - Clamped voltage during 10/1000µs surge; determines protected circuit's maximum transient stress. |
| PPK | 600 W - Peak pulse power rating per 10/1000µs waveform; defines single-event surge energy handling. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; critical for low-power standby circuits and battery-backed systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial power modules. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090g mass; compatible with automated pick-and-place. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance. Weight: 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge events (e.g., reverse-battery protection). |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 75V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping speed | <1.0 ps response - Enables suppression of ultrafast ESD and EFT transients before sensitive ICs latch up. |
| ISO 7637-2 compliance | Pulse 1, 2a, 2b, 3a, 3b - Validated for automotive power-line immunity testing without external filtering. |
| Glass passivation | Junction stability over 1000+ thermal cycles - Ensures long-term reliability in engine control units and industrial PLCs. |
| Halogen-free & RoHS | IEC 61249-2-21 compliant - Meets environmental requirements for EU and global electronics manufacturing. |
| Moisture sensitivity | J-STD-020 Level 1 - No bake requirement prior to reflow; supports standard SMT assembly flow. |
Applications
| Automotive Power Rail Protection | Industrial DC Input Stage |
|---|---|
|
Use Scenario: 12V/24V vehicle battery line exposed to load dump (up to 120V) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and DC-DC converter input. Use Value: Limits transient voltage to ≤121V, protecting downstream regulators and microcontrollers from damage per ISO 7637-2 Pulse 5a. |
Use Scenario: 48V DC input to programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Standoff-rated clamping device on main power entry, upstream of bulk capacitance. Use Value: Absorbs 600W surges from relay coil flyback or cable coupling, maintaining VWM = 75V margin above nominal 48V rail. |
| LED Driver Overvoltage Clamp | Telecom Power Interface |
|
Use Scenario: Constant-current LED string driver subjected to inductive switching spikes from nearby solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals. Use Value: Clamps spikes to 121V within sub-nanosecond, preventing MOSFET gate oxide failure and LED open-circuit faults. |
Use Scenario: -48V telecom power feed entering remote radio unit (RRU) enclosure. IC Role / Device Role / Timing Role: First-stage transient protector on primary DC input before DC-DC isolation stage. Use Value: Withstands repeated 10/1000µs surges up to 5.2A while maintaining <1µA leakage at -48V, preserving standby current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA | Bidirectional variant; symmetric VBR (83.3–92.1V) in both polarities; same VC = 121V @ 5.2A. | Required where AC-coupled signals or reversible polarity lines (e.g., RS-485, CAN bus) need protection. | Select SMBJ75CA only if bidirectional clamping is required; SMBJ75A offers lower leakage in unidirectional DC rails. |
| SAC75 | Same VWM = 75V, but lower PPK = 400W; VC = 125V @ 3.2A; DO-214AB (SMC) package (larger footprint). | Suitable for lower-energy transients; requires PCB layout change due to larger SMC package. | Choose SAC75 only if space allows SMC and 400W rating suffices; SMBJ75A delivers 50% higher surge capacity in SMB footprint. |
Compared with SMBJ75CA and SAC75, the SMBJ75A provides optimal balance of 600W surge rating, SMB package compatibility, and minimal leakage in unidirectional DC protection - making it preferred for automotive body control modules and industrial 24/48V power supplies where layout density and clamping precision are critical.
Availability
SMBJ75A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC input stage hardening, LED driver overvoltage clamp, and telecom power interface applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMBJ75A 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, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, robust thermal performance, and automated assembly readiness.
FAQ
What is the clamping voltage of SMBJ75A under a 10/1000µs surge?
The SMBJ75A clamps to a maximum of 121 V when subjected to a 10/1000µs surge current of 5.2 A, as specified in the Electrical Specifications table. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during standardized transient events. The SMBJ75A maintains this clamping performance across its qualified operating temperature range.
Is SMBJ75A unidirectional or bidirectional?
SMBJ75A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single-polarity breakdown specification (VBR min/max applies only in reverse bias). It features a cathode band marking and is intended for DC line protection where polarity is fixed - unlike SMBJ75CA, which provides symmetrical clamping in both directions.
What is the maximum junction temperature rating for SMBJ75A?
The SMBJ75A has a maximum junction temperature (TJ) rating of +150°C, verified per Absolute Maximum Ratings. This enables reliable operation in under-hood automotive environments and enclosed industrial power modules. Derating curves (Fig.2) define allowable peak power reduction above 25°C ambient, ensuring thermal safety up to the rated TJ.
Does SMBJ75A meet automotive transient immunity standards?
Yes, SMBJ75A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances from conduction and coupling in automotive 12V and 24V systems. Its 600W peak pulse rating, fast <1.0ps response, and validated clamping behavior make it suitable for ECU, BCM, and infotainment power rail protection without additional filtering.
What is the leakage current of SMBJ75A at its working stand-off voltage?
At VWM = 75 V and TA = 25°C, the SMBJ75A exhibits a maximum blocking leakage current (ID) of 1 µA. This low leakage preserves power efficiency in always-on systems such as telematics modules and battery-backed sensors, and remains stable across its -55°C to +150°C operating temperature range.
SMBJ75A 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:
- 121V
- Current - Peak Pulse (10/1000µs):
- 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)
SMBJ75A FAQ
1.How can I place an order for SMBJ75A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75A 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 SMBJ75A reliable?
The price and inventory of SMBJ75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75A is usually 5 days.
3.What payment methods are accepted for SMBJ75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75A?
SMBJ75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75A 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 SMBJ75A?
For technical support, including SMBJ75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75A requirements.
6.How does Aetrix verify that SMBJ75A is sourced from the original manufacturer or authorized distributors?
All SMBJ75A 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 SMBJ75A meets industry standards.
7.What is the process for return or replacement of SMBJ75A?
All SMBJ75A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75A, 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 SMBJ75A part is unused and in its original packaging.
Return procedure for SMBJ75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ75A 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…
