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Taiwan Semiconductor Corporation SMAJ7.5CA
- Part No.:
- SMAJ7.5CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,888
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Product details
Overview
SMAJ7.5CA 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 7.5 V working stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR @ 1 mA), 12.9 V maximum clamping voltage (VC) at 100 A peak pulse current, and 400 W peak pulse power rating (10/1000 µs waveform). It is commonly deployed in automotive body electronics and industrial DC/DC converters requiring ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance.
For engineers reviewing the SMAJ7.5CA datasheet, SMAJ7.5CA pinout, SMAJ7.5CA application, or SMAJ7.5CA equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1 µA @ 7.5 V), DO-214AC (SMA) package compatibility with automated placement, and verified performance under repetitive surge stress per JESD22-A114.
Technical Context
The SMAJ7.5CA employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps from 0 V to VBR min) and stable clamping across temperature (–55 °C to +150 °C operating junction range). Its bidirectional configuration enables symmetrical protection without polarity sensitivity, supporting both positive and negative transients on the same line.
It meets ISO 7637-2 test requirements for automotive electrical systems-including Pulse 1 (inductive load dump suppression), Pulse 2a (sudden load disconnection), and Pulse 3a/3b (capacitive coupled transients)-with clamping performance validated under 10/1000 µs standardized surge waveforms and derated power handling above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR @ IT=1 mA | 8.33–9.21 V - Breakdown onset range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM=100 A | 12.9 V - Maximum clamped voltage during 100 A surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy absorption capacity; supports high-energy transients in automotive environments. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage; avoids parasitic loading on low-power sensor or logic circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060 g mass; compatible with J-STD-002 soldering and JESD201 Class 2 whisker resistance. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation eliminates functional polarity dependence).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no directional bias required-enables single-component protection of AC-coupled or floating lines. |
| Case | Mechanical mounting / thermal path | Non-electrical; thermally conductive epoxy body aids heat dissipation during repetitive surges. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of differential signals or ungrounded rails without polarity constraints-no need for dual-device configurations. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), and Pulse 3a/3b (capacitive coupling); reduces validation effort for automotive ECUs. |
| Fast response time | <1.0 ps junction turn-on; clamps transients before sensitive logic or analog circuitry experiences overvoltage stress. |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow; simplifies SMT line logistics and inventory management. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN bus transceivers from load dump and alternator ripple in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching ASIC-level ESD structures. Use Value: Limits clamped voltage to ≤12.9 V during 100 A pulses-well below 16 V absolute max ratings of common 5 V/3.3 V automotive MCUs. |
Use Scenario: Shields primary-side MOSFET gate drivers and controller ICs from switching-induced voltage spikes in 24 V to 5 V isolated buck converters. IC Role / Device Role / Timing Role: Fast-acting crowbar device absorbing energy from transformer leakage inductance and layout parasitics. Use Value: 400 W peak power rating sustains repeated 10/1000 µs surges without degradation-critical for long-lifetime industrial power supplies. |
| LED Driver Power Input | Smart Meter Communication Interface |
Use Scenario: Guards constant-current LED driver ICs against inrush and lightning-induced surges on 12–48 V input rails in outdoor signage and street lighting. IC Role / Device Role / Timing Role: Primary overvoltage defense upstream of input capacitors and active regulation circuitry. Use Value: 7.5 V VWM provides 20% headroom above nominal 6 V logic supply-prevents false triggering while maintaining tight clamping margin. |
Use Scenario: Protects RS-485 transceivers and microcontroller UART pins in utility smart meters exposed to induced surges on meter-to-concentrator communication lines. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF), bidirectional clamp placed adjacent to connector to minimize stub length. Use Value: Sub-1 µA leakage at 7.5 V avoids signal integrity degradation on high-impedance bias networks used in half-duplex RS-485 receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A | Unidirectional; 9.2 V VC @ 100 A; requires correct polarity orientation. | Suitable only where circuit ground reference is fixed and polarity known-e.g., single-rail DC inputs with defined anode/cathode routing. | Select SMAJ7.5A only if board layout enforces strict polarity and lower clamping voltage (9.2 V vs. 12.9 V) is prioritized over flexibility. |
| SMBJ7.5CA | Same electrical specs but DO-214AA (SMB) package; 1.5× larger footprint and higher thermal mass. | Better suited for high-reliability applications needing enhanced surge endurance or manual rework accessibility. | Choose SMBJ7.5CA when PCB space allows and thermal derating margin >20% is required for extended lifetime in harsh environments. |
Compared with SMAJ7.5A and SMBJ7.5CA, the SMAJ7.5CA uniquely balances bidirectional operation, compact DO-214AC footprint, and automotive-grade surge immunity-making it optimal for space-constrained, polarity-agnostic protection in modern embedded power interfaces.
Availability
SMAJ7.5CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED driver power inputs, and smart meter communication interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5CA 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, and rectifiers with global AEC-Q200 qualification capabilities.
The SMAJ series was developed specifically for automotive and industrial transient suppression-emphasizing ISO 7637-2 compliance, high surge robustness, and surface-mount manufacturability in compact packages.
FAQ
What is the clamping voltage of the SMAJ7.5CA under a 100 A surge?
The SMAJ7.5CA has a maximum clamping voltage (VC) of 12.9 V when subjected to a 100 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C) and ensures downstream components remain within safe operating voltage limits during transient events. The SMAJ7.5CA maintains this clamping performance across its full operating temperature range.
Is the SMAJ7.5CA unidirectional or bidirectional?
The SMAJ7.5CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive- and negative-going transients without requiring polarity-specific placement. This makes the SMAJ7.5CA ideal for protecting AC-coupled lines, floating sensors, or any interface where voltage polarity reversal is possible-unlike unidirectional variants such as SMAJ7.5A.
Does the SMAJ7.5CA meet automotive surge standards?
Yes, the SMAJ7.5CA meets ISO 7637-2 requirements for automotive electrical disturbances, including Pulse 1 (inductive load dump), Pulse 2a (sudden battery disconnection), and Pulses 3a/3b (capacitive coupled transients). Its 400 W peak pulse power rating and fast response time (<1.0 ps) are validated for these test profiles, making the SMAJ7.5CA suitable for use in body control modules, lighting systems, and infotainment power supplies.
What is the maximum operating temperature for the SMAJ7.5CA?
The SMAJ7.5CA has a maximum junction temperature (TJMAX) of +150 °C and an operating junction temperature range of –55 °C to +150 °C. Its thermal performance is supported by the DO-214AC (SMA) package's low thermal resistance and glass-passivated junction design. Derating curves in the official TSC datasheet specify reduced peak power capability above 25 °C ambient-critical for sustained surge duty in engine bay or industrial enclosures.
How does the SMAJ7.5CA compare to the SMAJ7.5A in terms of circuit design impact?
The SMAJ7.5CA eliminates polarity dependency, allowing placement without regard to anode/cathode orientation-reducing layout risk and assembly errors. In contrast, the SMAJ7.5A is unidirectional and must be oriented correctly relative to system ground. While the SMAJ7.5A offers slightly lower clamping (9.2 V vs. 12.9 V), the SMAJ7.5CA's bidirectional behavior provides greater design flexibility and robustness in real-world wiring scenarios where polarity may be ambiguous or reversed.
SMAJ7.5CA 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5CA FAQ
1.How can I place an order for SMAJ7.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA 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 SMAJ7.5CA reliable?
The price and inventory of SMAJ7.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CA is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA?
SMAJ7.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA 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 SMAJ7.5CA?
For technical support, including SMAJ7.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA requirements.
6.How does Aetrix verify that SMAJ7.5CA is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA 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 SMAJ7.5CA meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA?
All SMAJ7.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA, 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 SMAJ7.5CA part is unused and in its original packaging.
Return procedure for SMAJ7.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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