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Taiwan Semiconductor Corporation SMAJ75CAH
- Part No.:
- SMAJ75CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAH.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,905
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Product details
Overview
SMAJ75CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. It features a 75V working stand-off voltage (VWM), 83.3–92.1V breakdown voltage (VBR), 121V maximum clamping voltage (VC) at 3.3A peak impulse current, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMAJ75CAH datasheet, SMAJ75CAH pinout, SMAJ75CAH application, or SMAJ75CAH equivalent, this device is selected for robust ESD and surge immunity in DC/DC converters, automotive power modules, and ISO 7637-2-compliant vehicle subsystems where fast response (<1.0ps), low leakage (<1µA), and stable clamping under 10/1000µs transients are critical.
Technical Context
The SMAJ75CAH implements a glass-passivated silicon junction optimized for bidirectional transient suppression with symmetrical electrical characteristics in both polarities. Its clamping behavior is defined by a 10/1000µs waveform, delivering 400W peak pulse power up to 78V and 300W above that threshold.
It operates across –55°C to +150°C junction temperature range, meets JESD201 Class 2 whisker resistance, and complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive-switching immunity. Moisture sensitivity is rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold. |
| VBR min/max | 83.3 V / 92.1 V @ 1 mA - Verified breakdown range ensures reliable turn-on margin above VWM without premature conduction. |
| VC @ IPPM | 121 V @ 3.3 A - Clamping voltage during 10/1000µs surge; defines worst-case voltage seen by protected downstream circuitry. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating determines survivability against standardized automotive transients. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves efficiency in high-impedance bias networks and battery-powered systems. |
| TJ max | +150 °C - Enables placement near heat-generating components (e.g., MOSFETs, inductors) in engine-control units. |
| Package | DO-214AC (SMA) - Surface-mount outline compatible with automated assembly; 0.060 g mass supports vibration resilience. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common reference terminal, not unidirectional anode/cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Both terminals function identically; connected across protected line and ground to clamp surges in either polarity. |
| Cathode band marking | Reference orientation indicator | Ensures consistent PCB layout alignment; no functional polarity-used only for mechanical orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock per stress test requirements. |
| Fast response time | <1.0 ps rise-to-breakdown enables suppression before sensitive ICs experience damaging overvoltage. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and VC under repeated surge events and high-temperature operation. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant manufacturing and end-of-life handling. |
Applications
| Automotive Body Control Module (BCM) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O from load-dump spikes during alternator regulation faults. IC Role / Device Role: Bidirectional TVS placed between LIN line and chassis ground. Use Value: Limits transient voltage to ≤121 V, preventing latch-up or gate oxide damage in 5V-tolerant transceivers. |
Use Scenario: Shields primary-side controller ICs and gate drivers in 12V-to-5V/3.3V buck converters from switching noise and input surges. IC Role / Device Role: Line-to-ground clamping device on converter input rail. Use Value: Maintains <1 µA leakage at 75 V, avoiding quiescent current degradation while surviving 400W 10/1000µs pulses. |
| LED Headlamp Driver | Infotainment Power Supply |
Use Scenario: Safeguards constant-current LED driver ICs against inductive kickback from relay-controlled headlamp loads. IC Role / Device Role: Parallel-connected TVS across driver output and ground. Use Value: Clamps 8.3 ms half-sine surges up to 40 A (IFSM), ensuring driver survival during hot-swap or relay bounce events. |
Use Scenario: Guards USB-C PD controller and PMIC inputs against ESD and conducted transients from vehicle battery rail. IC Role / Device Role: Primary surge suppression stage before LDO or buck regulator input. Use Value: Provides 121 V clamping ceiling and AEC-Q101 qualification, meeting OEM EMC and reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA | Same electrical specs but lacks AEC-Q101 qualification; non-automotive grade. | Not approved for automotive under-hood deployment; suitable for industrial or consumer DC supplies. | Select SMAJ75CAH when automotive qualification, ISO 7637-2 compliance, or extended temperature operation is mandatory. |
| SMBJ75CA | DO-214AA (SMB) package; same VWM/VBR/VC but higher thermal resistance (RθJA ≈ 150°C/W vs. SMA's 120°C/W). | Lower power derating above 25°C; unsuitable for high-ambient-density layouts without thermal relief. | Choose SMAJ75CAH for space-constrained boards requiring higher power density and better thermal performance in DO-214AC footprint. |
Compared with SMAJ75CA and SMBJ75CA, the SMAJ75CAH delivers certified automotive reliability, tighter thermal management in the smaller SMA package, and guaranteed ISO 7637-2 immunity-making it the sole choice for production-grade vehicle electronics where failure modes carry safety implications.
Availability
SMAJ75CAH is available at Aetrix Electronics and suitable for automotive body control modules, on-board DC/DC converters, and LED lighting drivers requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.
Supply support for SMAJ75CAH 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 high-reliability protection devices and power management solutions.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust glass-passivated junctions for mission-critical overvoltage protection.
FAQ
What is the clamping voltage of SMAJ75CAH under a 10/1000µs surge?
The SMAJ75CAH clamps to a maximum of 121 V when subjected to its rated peak impulse current of 3.3 A under the standard 10/1000µs waveform. This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ75CAH unidirectional or bidirectional?
SMAJ75CAH is a bidirectional TVS diode, as confirmed by the "CAH" suffix and explicit documentation stating "electrical characteristics apply in both directions." Its symmetrical breakdown and clamping behavior make it ideal for AC-coupled lines or DC rails requiring protection against polarity-agnostic transients.
Does SMAJ75CAH meet automotive qualification standards?
Yes, SMAJ75CAH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. These certifications are documented in the product release version A2102 and verified through TSC's automotive reliability test reports.
What is the maximum operating temperature for SMAJ75CAH?
The SMAJ75CAH has a specified operating junction temperature range of –55°C to +150°C. This wide range supports deployment in engine compartments and other high-thermal-stress environments typical of automotive electronic control units.
How does SMAJ75CAH differ from SMAJ75AH?
SMAJ75CAH is the bidirectional variant (CAH suffix), whereas SMAJ75AH is unidirectional (AH suffix). Their VWM, VBR, and VC values differ slightly: SMAJ75AH has VBR = 83.3–92.1 V and VC = 129 V, while SMAJ75CAH has identical VBR but lower VC = 121 V due to symmetrical junction design and test conditions.
SMAJ75CAH 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:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75CAH FAQ
1.How can I place an order for SMAJ75CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAH 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 SMAJ75CAH reliable?
The price and inventory of SMAJ75CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAH is usually 5 days.
3.What payment methods are accepted for SMAJ75CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAH?
SMAJ75CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAH 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 SMAJ75CAH?
For technical support, including SMAJ75CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAH requirements.
6.How does Aetrix verify that SMAJ75CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAH 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 SMAJ75CAH meets industry standards.
7.What is the process for return or replacement of SMAJ75CAH?
All SMAJ75CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAH, 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 SMAJ75CAH part is unused and in its original packaging.
Return procedure for SMAJ75CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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