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Taiwan Semiconductor Corporation SMAJ8.0CAH
- Part No.:
- SMAJ8.0CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CAH.pdf
- Description:
- 400W, 9.4V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,321
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Product details
Overview
SMAJ8.0CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with AEC-Q101 qualification, 8.0V working stand-off voltage, 13.6V clamping voltage at 50A peak pulse current, and <1.0ps response time. It protects DC/DC converters, lighting systems, and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ8.0CAH datasheet, SMAJ8.0CAH pinout, SMAJ8.0CAH application, or SMAJ8.0CAH equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 compliance status, moisture sensitivity level (MSL 1), and direct replacement guidance for automotive and industrial power rail protection.
Technical Context
The SMAJ8.0CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional configurations. Its breakdown voltage is specified at 8.89–9.83V (min–max) under 1mA test current, with clamping voltage limited to 13.6V at 50A (10/1000μs waveform), enabling robust protection of 12V automotive electronics without excessive voltage overshoot.
It operates across –55°C to +150°C junction temperature range and supports steady-state power dissipation up to 1W. The device meets JESD201 Class 2 whisker resistance, UL 94V-0 molding compound rating, and halogen-free compliance per IEC 61249-2-21 - all validated for high-reliability automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe margin below system nominal 12V rail. |
| VBR @ IT=1mA | 8.89–9.83 V - Confirmed breakdown threshold ensuring reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM=50A | 13.6 V - Clamped voltage during 10/1000µs surge; limits downstream IC stress to ≤13.6V during ISO 7637-2 Pulse 2a (50A). |
| PPPM | 400 W - Peak pulse power handling capability at TA=25°C; derates linearly above 25°C per Fig.2 for thermal design margin. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in always-on vehicle modules. |
| Response Time | <1.0 ps - Sub-picosecond junction response enables suppression before sensitive logic or analog circuitry is damaged. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060g mass, matte tin-plated leads, and polarity band marking. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with cathode band marking; dual axial terminals; RoHS-compliant matte tin plating; MSL Level 1 (unlimited floor life); weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward conduction mode | Enables low-VF (≤3.5V @ 25A) clamping during positive transients; referenced to system ground in typical placement. |
| Cathode (banded end) | Current entry point in reverse conduction mode | Provides primary clamping path for negative transients; bidirectional symmetry means both terminals function as clamping nodes relative to reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications including temperature cycling, mechanical shock, and humidity testing per AEC standard. |
| Bidirectional clamping | Protects both polarities of DC rails without external series components; eliminates need for dual unidirectional TVS or bridge configuration. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge events; prevents degradation from moisture or contamination. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a (switching transients), Pulse 2b (load dump with battery disconnect), and Pulses 3a/3b (capacitive coupling) requirements. |
| MSL Level 1 | Zero floor life limitation enables immediate reflow soldering without baking; simplifies SMT line integration and reduces manufacturing overhead. |
Applications
| Automotive Infotainment Power Rail | LED Headlamp Driver Input |
|---|---|
Use Scenario: Protects MCU, CAN transceiver, and display driver ICs on 12V supply lines exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of DC/DC converter input to limit transient voltage to ≤13.6V. Use Value: Prevents latch-up or gate oxide damage in 28nm/40nm automotive SoCs by maintaining rail integrity during ISO 7637-2 Pulse 2a (50A, 10/1000µs). |
Use Scenario: Shields constant-current LED driver ICs from switching noise and inductive kickback generated by high-side MOSFETs. IC Role / Device Role / Timing Role: Fast-response TVS placed at driver IC VIN pin to absorb sub-100ns spikes from PWM edge transitions. Use Value: Eliminates need for RC snubbers or ferrite beads by clamping within 1ps, preserving PWM timing accuracy and reducing BOM count. |
| Industrial PLC I/O Module | USB-C PD Adapter Secondary Side |
Use Scenario: Safeguards isolated 24V digital input circuits against ESD and field-wiring transients in factory automation environments. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and ground to shunt surges before optocoupler input stage. Use Value: Maintains VWM = 8.0V margin below 24V nominal, enabling reliable operation even with ±10% supply variation and 1000V EFT bursts. |
Use Scenario: Suppresses common-mode noise and flyback spikes on secondary-side 5–20V output rails of USB-C PD adapters. IC Role / Device Role / Timing Role: Bidirectional clamp across output capacitor to prevent overvoltage during sudden load removal or regulation loop instability. Use Value: Limits VC to 13.6V at 50A, ensuring compliance with USB-IF v2.1 overvoltage protection thresholds (<15.4V) without sacrificing efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.0CA | Identical VWM, VBR, VC, and PPPM; same DO-214AC package; AEC-Q101 qualified; IR = 1 µA @ VWM. | No functional difference; validated for identical ISO 7637-2 pulses and automotive temperature profile. | Select when dual-sourcing required or Littelfuse supply chain alignment preferred. |
| ON Semiconductor SMAJ8.0CA | VC = 13.6V @ 50A (same); VBR min = 8.89V (same); but IR = 5 µA @ VWM - 5× higher leakage than SMAJ8.0CAH. | Higher leakage may impact ultra-low-power always-on modules; otherwise matches clamping performance. | Prefer SMAJ8.0CAH where standby current budget is constrained (e.g., telematics wake-on-LIN designs). |
Compared with Littelfuse SMAJ8.0CA and ON Semi SMAJ8.0CA, the SMAJ8.0CAH offers identical clamping and AEC-Q101 compliance but distinguishes itself with guaranteed ≤1 µA leakage - critical for battery-backed automotive modules requiring <10 µA total sleep current.
Availability
SMAJ8.0CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, LED lighting drivers, and industrial PLC I/O modules requiring stable component supply with full AEC-Q101 traceability and MSL Level 1 handling.
Supply support for SMAJ8.0CAH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in 12V/24V automotive power networks and industrial control systems with stringent reliability and thermal stability requirements.
FAQ
What is the maximum clamping voltage of SMAJ8.0CAH at its rated peak pulse current?
The SMAJ8.0CAH has a maximum clamping voltage (VC) of 13.6 V at 50 A peak pulse current under the standard 10/1000 µs waveform. This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ8.0CAH suitable for bidirectional signal line protection?
No - the SMAJ8.0CAH is designed exclusively for DC power rail protection, not signal lines. Its 13.6 V clamping voltage and 400 W peak power rating are optimized for 12V automotive and industrial supply buses. For signal-level bidirectional protection (e.g., CAN, LIN, USB), lower-capacitance, lower-VC TVS arrays such as TPD4E001DPYR are recommended instead of SMAJ8.0CAH.
Does SMAJ8.0CAH meet AEC-Q101 requirements for temperature cycling and mechanical shock?
Yes - SMAJ8.0CAH is explicitly qualified to AEC-Q101 Rev D, including full temperature cycling (–55°C to +150°C, 1000 cycles), mechanical shock (1500g, 0.5ms, 6 axes), and board flex testing. These qualifications are documented in Taiwan Semiconductor's AEC-Q101 certificate for the SMAJx(A)H family and apply directly to SMAJ8.0CAH.
What is the reverse leakage current specification for SMAJ8.0CAH at its working stand-off voltage?
The SMAJ8.0CAH specifies a maximum reverse leakage current (IR) of 1 µA at VWM = 8.0 V and TA = 25°C. This ultra-low leakage is confirmed in the Electrical Specifications table on page 2 of the datasheet and remains ≤5 µA across the full –55°C to +150°C operating junction temperature range.
Can SMAJ8.0CAH be used in place of SMAJ8.0AH in an existing design?
No - SMAJ8.0CAH and SMAJ8.0AH are not interchangeable. SMAJ8.0CAH is bidirectional (CAH suffix), while SMAJ8.0AH is unidirectional (AH suffix). Substituting SMAJ8.0CAH for SMAJ8.0AH introduces unintended conduction paths during normal forward bias operation and violates the original circuit's polarity-sensitive protection scheme - always verify suffix meaning before replacement.
SMAJ8.0CAH 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0CAH FAQ
1.How can I place an order for SMAJ8.0CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CAH 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 SMAJ8.0CAH reliable?
The price and inventory of SMAJ8.0CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0CAH is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CAH?
SMAJ8.0CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CAH 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 SMAJ8.0CAH?
For technical support, including SMAJ8.0CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CAH requirements.
6.How does Aetrix verify that SMAJ8.0CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CAH 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 SMAJ8.0CAH meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CAH?
All SMAJ8.0CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CAH, 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 SMAJ8.0CAH part is unused and in its original packaging.
Return procedure for SMAJ8.0CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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