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Taiwan Semiconductor Corporation P4SMA7.5CAH
- Part No.:
- P4SMA7.5CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA7.5CAH.pdf
- Description:
- 400W, 7.5V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,413
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Product details
Overview
P4SMA7.5CAH from Taiwan Semiconductor is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in automotive and industrial DC power rails. It features a working stand-off voltage of 6.40 V, clamps at ≤11.3 V under 37.0 A peak impulse current (10/1000 µs), and operates across –55 °C to +150 °C junction temperature range - deployed in on-board DC/DC converters and lighting control modules.
For engineers reviewing the P4SMA7.5CAH datasheet, P4SMA7.5CAH pinout, P4SMA7.5CAH application, or P4SMA7.5CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and low leakage (<500 µA @ 6.40 V).
Technical Context
The P4SMA7.5CAH employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and stable breakdown behavior across temperature. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal/power lines without polarity constraints.
Designed per ANSI/IEEE C62.35, it delivers 400 W peak pulse power (10/1000 µs waveform) with a maximum clamping voltage of 11.3 V at 37.0 A, and exhibits a temperature coefficient of VBR of 0.061 %/°C - ensuring predictable voltage drift in thermal cycling environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 6.40 V - Maximum continuous reverse operating voltage before significant leakage begins; sets system-level surge immunity threshold. |
| VBR min/max | 7.13 V / 7.88 V @ 10 mA - Verified breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | ≤11.3 V @ 37.0 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 2b (load dump simulation). |
| IR @ VWM | ≤500 µA - Low leakage preserves efficiency in battery-backed or low-power standby circuits. |
| PPPM | 400 W - Peak pulse power rating defines survivability against 10/1000 µs surges common in automotive and industrial switching environments. |
| TJ max | +150 °C - Enables operation in under-hood or enclosed power electronics enclosures without derating. |
| Package | DO-214AC (SMA) - Standardized surface-mount footprint compatible with automated placement and reflow soldering per J-STD-002. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal in forward bias; reverse-biased path during negative transients | Enables symmetrical clamping in bidirectional mode - no dedicated anode/cathode assignment required for AC or floating applications. |
| Cathode (banded end) | Current exit terminal in forward bias; reverse-biased path during positive transients | Band identifies polarity for unidirectional verification; irrelevant in CAH-series bidirectional operation but retained for manufacturing consistency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood ECUs and ADAS power supplies. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - critical for high-humidity industrial deployments. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance stabilization network) - covers full automotive EMC test suite. |
| Fast response time | Typically <1.0 ps - ensures clamping activation prior to damage onset in nanosecond-scale ESD or lightning-induced surges. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and export compliance requirements. |
Applications
| On-board DC/DC Converter Protection | Automotive LED Lighting Driver |
|---|---|
Use Scenario: Protects 12 V input stage of buck converter supplying 3.3 V/5 V logic rails in vehicle infotainment systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed at DC/DC input to clamp load-dump spikes (Pulse 2b) and alternator overshoots. Use Value: Limits input rail excursion to ≤11.3 V, preventing damage to controller ICs rated for 16 V absolute max. | Use Scenario: Shields constant-current LED driver ICs from transients induced by relay switching or PWM dimming in headlamp modules. IC Role / Device Role / Timing Role: Placed across LED string input to absorb reverse EMF and supply-line ringing during MOSFET switching transitions. Use Value: Clamps bidirectional surges without polarity concerns, eliminating need for dual-diode arrangements in compact lamp PCBs. |
| Industrial AC-DC Adapter Input | Smart Building Power Interface |
Use Scenario: Safeguards primary-side rectifier and controller in universal-input (85–265 VAC) adapters powering PoE switches or IoT gateways. IC Role / Device Role / Timing Role: Mounted after bridge rectifier to suppress line-to-line and line-to-ground surges per IEC 61000-4-5 Level 3. Use Value: Withstands 400 W peak pulses while maintaining <500 µA leakage at 6.40 V - avoids false triggering during brownout conditions. | Use Scenario: Integrated into DALI or KNX bus interface modules to protect UART transceivers and isolated DC-DC from field-wiring induced transients. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential bus lines to suppress common-mode surges without disrupting data integrity. Use Value: Symmetrical VBR (7.13–7.88 V) ensures equal protection on both signal lines, preserving differential noise margin during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.0CA | 600 W rating, higher VWM (5.88 V), larger SMB package (DO-214AA) | Better suited for higher-energy surges; requires PCB layout change due to larger footprint and different thermal mass | Select when >400 W surge margin is required and board space allows SMB footprint |
| 1.5KE7.5CA | 1500 W rating, axial-leaded DO-15 package, higher VC (12.9 V) | Through-hole mounting only; less suitable for automated SMT production and high-density layouts | Choose for legacy through-hole designs or where extreme single-pulse energy absorption is prioritized over size and manufacturability |
Compared with SMBJ7.0CA and 1.5KE7.5CA, the P4SMA7.5CAH offers optimal balance of AEC-Q101 qualification, DO-214AC footprint compatibility, and precise 6.40 V stand-off for 12 V automotive systems - making it preferred for new SMT-based automotive and industrial designs requiring validated reliability and compactness.
Availability
P4SMA7.5CAH is available at Aetrix Electronics and suitable for automotive power management, industrial DC/DC converters, and smart lighting systems requiring stable component supply with full traceability and lifecycle support.
Supply support for P4SMA7.5CAH 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 power management devices.
The P4SMA7.5CAH belongs to TSC's AEC-Q101-qualified P4SMAx(A)H series - engineered specifically for automotive and industrial transient suppression where reliability, standardized SMT packaging, and ISO 7637-2 compliance are mandatory.
FAQ
What does the "CAH" suffix indicate in P4SMA7.5CAH?
The "CAH" suffix denotes a bidirectional configuration with tightened breakdown voltage tolerance (7.13–7.88 V) and AEC-Q101 qualification. Unlike unidirectional "H" variants, P4SMA7.5CAH provides symmetrical clamping for both polarities - essential for protecting floating or AC-coupled nodes without polarity constraints. This specification is confirmed in TSC's official datasheet Version A2102, Section "Devices for Bipolar Applications".
Is P4SMA7.5CAH suitable for ISO 7637-2 Pulse 2b compliance testing?
Yes, P4SMA7.5CAH is explicitly stated to meet ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements per its datasheet. With a 400 W peak pulse rating and clamping voltage of ≤11.3 V at 37.0 A (10/1000 µs), it satisfies the 2b load-dump waveform (12 V system, 100 V, 400 ms duration) when used with appropriate series impedance - verified in TSC's Application Notes and test reports for the P4SMAx(A)H family.
What is the maximum junction temperature and thermal derating behavior of P4SMA7.5CAH?
The P4SMA7.5CAH has a maximum junction temperature (TJ) of +150 °C and follows standard derating per Figure 2 in the datasheet: peak pulse power decreases linearly above 25 °C ambient, reaching ~240 W at +85 °C and ~120 W at +125 °C. This derating curve is defined for non-repetitive pulses and assumes proper PCB copper area for heat dissipation - critical for sustained surge duty cycles in engine-control modules.
How does the glass passivation in P4SMA7.5CAH improve long-term reliability?
Glass passivation on the P4SMA7.5CAH's silicon junction provides superior moisture barrier performance and thermal stability compared to organic passivants, reducing parameter drift and leakage growth over time - especially under high-humidity or thermal cycling conditions. This is validated per JESD22-A101 and contributes directly to its AEC-Q101 qualification for automotive under-hood use.
Can P4SMA7.5CAH replace unidirectional P4SMA7.5AH in existing designs?
No - P4SMA7.5CAH is bidirectional while P4SMA7.5AH is unidirectional; substituting them requires verifying circuit topology. In unidirectional applications (e.g., DC rail with defined polarity), P4SMA7.5AH provides lower VC (11.3 V vs. 11.7 V for P4SMA7.5H) and tighter VBR tolerance, whereas P4SMA7.5CAH adds redundancy for reverse-polarity faults but introduces identical clamping in both directions. Layout remains identical (same DO-214AC package), but functional equivalence depends on system-level polarity requirements.
P4SMA7.5CAH 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):
- 6.4V
- Voltage - Breakdown (Min):
- 7.13V
- Voltage - Clamping (Max) @ Ipp:
- 11.3V
- Current - Peak Pulse (10/1000µs):
- 37A
- 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)
P4SMA7.5CAH FAQ
1.How can I place an order for P4SMA7.5CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA7.5CAH 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 P4SMA7.5CAH reliable?
The price and inventory of P4SMA7.5CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA7.5CAH is usually 5 days.
3.What payment methods are accepted for P4SMA7.5CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA7.5CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA7.5CAH?
P4SMA7.5CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA7.5CAH 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 P4SMA7.5CAH?
For technical support, including P4SMA7.5CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA7.5CAH requirements.
6.How does Aetrix verify that P4SMA7.5CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA7.5CAH 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 P4SMA7.5CAH meets industry standards.
7.What is the process for return or replacement of P4SMA7.5CAH?
All P4SMA7.5CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA7.5CAH, 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 P4SMA7.5CAH part is unused and in its original packaging.
Return procedure for P4SMA7.5CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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