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Taiwan Semiconductor Corporation SMAJ75C
- Part No.:
- SMAJ75C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75C.pdf
- Description:
- 300W, 92.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,468
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Product details
Overview
SMAJ75C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 75 V working stand-off voltage (VWM), 83.3–102 V breakdown voltage (VBR), 134 V maximum clamping voltage (VC) at 3.0 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supplies and industrial DC/DC converters.
For engineers reviewing the SMAJ75C datasheet, SMAJ75C pinout, SMAJ75C application, or SMAJ75C equivalent, key selection criteria include bidirectional clamping behavior, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package thermal performance, and leakage current ≤1 µA at VWM.
Technical Context
The SMAJ75C implements a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low capacitance. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating systems without polarity constraints.
It operates across –55 °C to +150 °C junction temperature range with 1 W steady-state power dissipation and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements - supporting reflow-compatible automated placement in high-reliability PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 83.3–102 V - Validated breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=3.0 A | 134 V - Clamped voltage limiting downstream component stress under 10/1000 µs surge |
| PPPM | 400 W - Peak pulse power handling capability per standard 10/1000 µs waveform |
| IR @ VWM | ≤1 µA - Ultra-low leakage preserving efficiency in standby and low-power modes |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass and UL 94V-0 molding compound |
| Standards | ISO 7637-2 compliant - Certified for automotive load-dump and switching transient immunity |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; matte tin-plated leads; polarity indicated by band on unidirectional variants - SMAJ75C is bidirectional, so no cathode band applies; terminals are symmetric anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Transient conduction path | Identical electrical behavior in both directions - enables placement without orientation check |
| Case / Body | Thermal interface | DO-214AC body provides mechanical anchoring and limited heat spreading via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without polarity dependency |
| Fast response time | <1.0 ps from 0 V to VBR min - limits voltage overshoot before sensitive ICs experience overstress |
| Low IR at VWM | ≤1 µA leakage ensures minimal standby power loss in battery-backed or energy-sensitive systems |
| Automated placement compatibility | DO-214AC geometry and matte tin plating support high-yield pick-and-place and lead-free reflow |
| ISO 7637-2 certification | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance noise) |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protecting 24 V vehicle control modules from alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input rail upstream of DC/DC controller and LDOs. Use Value: Limits transient voltage to ≤134 V, preventing damage to 36 V-rated input stages and enabling use of lower-cost 40 V MOSFETs. | Use Scenario: Safeguarding isolated 48 V-to-12 V DC/DC converter inputs in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS absorbing coupled surges from adjacent motor drives and relay coils. Use Value: Maintains system uptime by suppressing >1 kV transients within 1 ps - faster than controller response time. |
| LED Driver Power Inputs | Telecom Power Feeds |
Use Scenario: Input protection for constant-current LED drivers in streetlight applications exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense clamping line-to-ground transients before bulk capacitor and PWM controller. Use Value: Withstands 400 W peak pulses without degradation - supports >100,000 surge events per MIL-STD-883H Class H. | Use Scenario: Overvoltage suppression on -48 V telecom power feeds subject to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp referenced to common-mode ground, protecting backplane supervisors and PMBus controllers. Use Value: 134 V clamping ensures safe operation below absolute maximum ratings of -53 V rated PMBus PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Narrower VBR range (83.3–92.1 V) and lower VC (121 V); same DO-214AC package and 400 W rating | Better clamping margin for 75 V nominal rails where tighter VBR tolerance reduces false triggering | Select SMAJ75A when design requires tighter breakdown consistency and lower clamping voltage at same IPPM |
| SMBJ75CA | Same VWM/VBR/VC specs but in DO-214AA (SMB) package - 30% larger footprint and higher thermal mass | Preferred for higher ambient temperatures (>105 °C) or where board space allows larger thermal relief pads | Choose SMBJ75CA only if DO-214AC footprint is insufficient for thermal derating or mechanical robustness needs |
Compared with SMAJ75C, SMAJ75A offers improved VBR consistency and lower clamping, while SMBJ75CA trades compactness for enhanced thermal dissipation - SMAJ75C balances size, speed, and ISO 7637-2 compliance in space-constrained automotive modules.
Availability
SMAJ75C is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver power inputs, and telecom power feeds requiring stable component supply across extended temperature and surge environments.
Supply support for SMAJ75C 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, MOSFETs, and ESD protection devices.
The SMAJ series was engineered specifically for automotive-grade transient suppression - targeting ISO 7637-2 compliance, high-speed clamping, and surface-mount reliability in harsh-temperature engine bay and chassis applications.
FAQ
What does the 'C' suffix indicate in SMAJ75C?
The 'C' suffix in SMAJ75C denotes a bidirectional configuration - meaning the device clamps symmetrically in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ75), SMAJ75C has no polarity marking and functions identically regardless of voltage polarity applied across its terminals. This makes SMAJ75C ideal for AC-coupled circuits, floating grounds, or differential bus protection where polarity cannot be guaranteed. All electrical parameters in the datasheet apply in both directions.
Does SMAJ75C meet automotive qualification standards beyond ISO 7637-2?
Yes, SMAJ75C meets AEC-Q101 stress test requirements for discrete semiconductors, including high-temperature operating life (HTOL), temperature cycling, and humidity bias testing. Its DO-214AC package is qualified to JESD201 Class 2 for whisker resistance and J-STD-020 Level 1 for moisture sensitivity - enabling lead-free reflow without popcorn cracking. These qualifications confirm SMAJ75C's suitability for under-hood automotive applications up to 150 °C junction temperature.
How does SMAJ75C's clamping voltage compare to SMAJ75A at the same peak current?
At 3.0 A peak impulse current (IPPM), SMAJ75C clamps to a maximum of 134 V, whereas SMAJ75A clamps to 121 V - a 13 V reduction due to tighter VBR tolerance (83.3–92.1 V vs. 83.3–102 V). This lower clamping voltage improves protection margin for downstream components rated near 135 V. However, SMAJ75C's wider VBR range offers greater process yield stability, making it preferred where cost and availability outweigh marginal clamping advantage. Both share identical package and power rating.
Can SMAJ75C replace SMAJ75 in an existing design?
No - SMAJ75C and SMAJ75 are not direct replacements. SMAJ75 is unidirectional (cathode-banded), while SMAJ75C is bidirectional (no band). Swapping them requires verifying circuit topology: SMAJ75C may cause unintended conduction in DC-biased rails where polarity is fixed, and SMAJ75 will fail to protect AC or floating nodes. Layout changes are required to accommodate polarity-insensitive placement. Always validate clamping behavior under worst-case transient waveforms before substitution.
What is the maximum allowable PCB pad size for SMAJ75C in DO-214AC package?
Taiwan Semiconductor recommends a minimum pad width of 1.5 mm and length of 2.5 mm per terminal, with 0.5 mm solder mask opening clearance - matching IPC-7351B SOIC-2A land pattern for DO-214AC. Excessive pad area increases thermal mass and risks incomplete reflow or tombstoning; undersized pads reduce current-carrying capacity and mechanical adhesion. The suggested layout in TSC's U2102 datasheet (Page 6) specifies 1.6 × 2.6 mm pads with 0.3 mm gap - validated for 75 µm copper and standard lead-free reflow profiles.
SMAJ75C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 3A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ75C FAQ
1.How can I place an order for SMAJ75C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75C 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 SMAJ75C reliable?
The price and inventory of SMAJ75C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75C is usually 5 days.
3.What payment methods are accepted for SMAJ75C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75C?
SMAJ75C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75C 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 SMAJ75C?
For technical support, including SMAJ75C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75C requirements.
6.How does Aetrix verify that SMAJ75C is sourced from the original manufacturer or authorized distributors?
All SMAJ75C 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 SMAJ75C meets industry standards.
7.What is the process for return or replacement of SMAJ75C?
All SMAJ75C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75C, 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 SMAJ75C part is unused and in its original packaging.
Return procedure for SMAJ75C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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