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Taiwan Semiconductor Corporation SMAJ7.5CH
- Part No.:
- SMAJ7.5CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CH.pdf
- Description:
- 400W, 9.3V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,754
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Product details
Overview
SMAJ7.5CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with AEC-Q101 qualification, 14.3V clamping voltage at 100A peak pulse current, and 7.5V working stand-off voltage. It protects DC/DC converters, SMPS inputs, and lighting circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ7.5CH datasheet, SMAJ7.5CH pinout, SMAJ7.5CH application, or SMAJ7.5CH equivalent, this page delivers verified electrical specs, clamping behavior under 10/1000μs waveform, bidirectional capability confirmation, and direct substitution guidance for automotive power rail protection designs.
Technical Context
The SMAJ7.5CH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps from 0 V to VBR min) and low leakage (<1 μA at 7.5V). Its unidirectional configuration uses cathode-band polarity marking per DO-214AC mechanical standard.
It meets ISO 7637-2 immunity requirements for automotive electronics and supports steady-state power dissipation up to 1W with junction temperature range of –55°C to +150°C. The device is rated for 400W peak pulse power (10/1000μs), derated linearly above 25°C ambient per published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for protected line voltage. |
| VBR @ IT=1 mA | 8.33–10.30 V - Breakdown voltage range at 1 mA test current; defines onset of avalanche conduction during overvoltage events. |
| VC @ IPPM=100 A | 14.3 V - Clamping voltage measured at 100 A peak impulse current (10/1000μs); determines maximum voltage seen by downstream circuitry. |
| PPPM | 400 W - Peak pulse power handling capability under standardized 10/1000μs waveform; validates robustness against load dump and inductive switching spikes. |
| IR @ VWM | <1 μA - Reverse leakage current at 7.5 V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive environments without thermal derating penalties. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected power rail (e.g., 5–7.5 V supply); conducts surge current toward cathode during reverse overvoltage. |
| Cathode | Ground/reference side terminal | Connected to system ground or low-impedance return path; establishes polarity-sensitive clamping action in unidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and infotainment systems per stress test requirements. |
| Clamping voltage ≤14.3 V at 100 A | Ensures downstream ICs rated for 16 V absolute maximum survive ISO 7637-2 Pulse 5a (load dump) without additional protection stages. |
| Fast response time <1.0 ps | Activates before sensitive logic or analog circuitry can be damaged by nanosecond-scale ESD or switching transients. |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow; compatible with standard SMT assembly lines without special handling. |
| RoHS & halogen-free compliant | Fulfills EU Directive 2011/65/EU and IEC 61249-2-21 requirements for environmentally constrained industrial and automotive production. |
Applications
| Automotive Body Control Module (BCM) | Industrial LED Driver Input Stage |
|---|---|
Use Scenario: Protects 12 V supply input of BCM microcontroller and CAN transceiver from battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between fused battery rail and local LDO input. Use Value: Limits transient voltage to ≤14.3 V, preventing latch-up or gate oxide damage in 16 V-rated MCU I/O and CAN PHY interfaces. |
Use Scenario: Shields constant-current LED driver IC from flyback spikes generated by magnetic transformer coupling in offline AC/DC LED drivers. IC Role / Device Role / Timing Role: Primary-side surge suppressor across bulk capacitor input terminals. Use Value: Absorbs 400 W pulses without degradation, maintaining stable 7.5 V reference for feedback loop while surviving repeated 10/1000μs surges. |
| On-board DC/DC Converter Input | USB-C Power Delivery Adapter Protection |
Use Scenario: Guards buck converter front-end against ESD and conducted noise from upstream 24 V vehicle bus in ADAS camera modules. IC Role / Device Role / Timing Role: First-line transient suppressor before input filter and controller IC. Use Value: Sub-1 ps response captures fast edge transients before they couple into switching node, preserving PWM timing accuracy and reducing EMI. |
Use Scenario: Secures secondary-side 5–9 V output rails in USB-C PD adapters against hot-plug surges and cable discharge events. IC Role / Device Role / Timing Role: Output-side TVS connected between VBUS and GND after isolation barrier. Use Value: 7.5 V VWM aligns with USB PD 3.0 programmable voltage ranges; 14.3 V clamping prevents overvoltage damage to Type-C port controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.5AHE3/5A | Same DO-214AC package, identical VWM (7.5 V), but lower VC = 12.9 V at 100 A and tighter VBR tolerance (8.33–9.21 V). | Better clamping margin for 12 V systems requiring sub-13 V protection ceiling; preferred where downstream ICs have 13.5 V abs max rating. | Select when tighter breakdown consistency and lower clamping voltage are critical, accepting slightly reduced surge energy margin. |
| ON Semiconductor SMAJ7.5A | Same VWM, VBR, and package, but rated for 300 W peak power (not 400 W) above 78 V - irrelevant here; full 400 W valid at 7.5 V. | No functional difference in 7.5 V applications; identical ISO 7637-2 compliance and AEC-Q101 qualification status. | Drop-in alternative with identical performance; choose based on distributor availability and traceability requirements. |
Compared with SMAJ7.5CH, SMAJ7.5AHE3/5A offers superior clamping precision at the cost of marginally lower surge energy headroom, while SMAJ7.5A matches all key parameters and qualifications - making it a functionally identical second-source option for supply chain resilience.
Availability
SMAJ7.5CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial LED drivers, on-board DC/DC converters, and USB-C power delivery adapters requiring stable component supply with AEC-Q101 assurance and full ISO 7637-2 compliance.
Supply support for SMAJ7.5CH 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 automotive, industrial, and consumer markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in harsh automotive environments, emphasizing fast response, repeatable clamping, and robust packaging for automated SMT assembly.
FAQ
What is the clamping voltage of SMAJ7.5CH at its rated peak pulse current?
The SMAJ7.5CH has a maximum clamping voltage (VC) of 14.3 V when subjected to a 100 A peak impulse current with a 10/1000μs waveform. This value is guaranteed across temperature and ensures protected circuits remain within safe operating limits during automotive load dump events. The SMAJ7.5CH maintains this clamping performance consistently due to its glass-passivated junction and AEC-Q101 validation.
Is SMAJ7.5CH suitable for bidirectional transient protection?
No - SMAJ7.5CH is a unidirectional TVS diode, indicated by the "H" suffix and cathode-band marking. For bidirectional protection, Taiwan Semiconductor specifies the SMAJ7.5AH variant (with "AH" suffix), which provides symmetrical clamping in both polarities. The SMAJ7.5CH must be oriented with cathode toward ground to function correctly; reverse installation will cause forward conduction and failure.
Does SMAJ7.5CH meet automotive qualification standards?
Yes, SMAJ7.5CH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass passivation, moisture sensitivity level 1, and JESD201 Class 2 whisker resistance - satisfies full automotive reliability criteria. This makes SMAJ7.5CH appropriate for under-hood and cabin ECUs where long-term field reliability is mandatory.
What is the maximum steady-state power dissipation for SMAJ7.5CH?
The SMAJ7.5CH has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient temperature. This value decreases linearly with rising ambient per the published derating curve (Fig.2), reaching ~0.5 W at 100°C. Engineers must ensure PCB copper area and airflow maintain junction temperature ≤150°C under continuous leakage conditions - especially critical in sealed automotive enclosures where ambient may exceed 85°C.
How does SMAJ7.5CH compare to SMAJ7.5A in terms of peak pulse power?
SMAJ7.5CH and SMAJ7.5A both deliver 400 W peak pulse power at 7.5 V under 10/1000μs waveform - no difference exists for this voltage grade. The datasheet note "300W above 78V" applies only to higher-voltage variants and does not affect SMAJ7.5CH performance. Both parts share identical VWM, VBR, VC, and package, confirming SMAJ7.5A as a fully compatible alternative for SMAJ7.5CH designs.
SMAJ7.5CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SMAJ7.5CH FAQ
1.How can I place an order for SMAJ7.5CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CH 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 SMAJ7.5CH reliable?
The price and inventory of SMAJ7.5CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CH is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CH?
SMAJ7.5CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CH 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 SMAJ7.5CH?
For technical support, including SMAJ7.5CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CH requirements.
6.How does Aetrix verify that SMAJ7.5CH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CH 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 SMAJ7.5CH meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CH?
All SMAJ7.5CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CH, 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 SMAJ7.5CH part is unused and in its original packaging.
Return procedure for SMAJ7.5CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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