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Taiwan Semiconductor Corporation SMAJ48CAH
- Part No.:
- SMAJ48CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
SMAJ48CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 48 V working stand-off voltage, 53.3–58.9 V breakdown voltage at 1 mA, and 77.4 V maximum clamping voltage at 5.2 A peak impulse current. It delivers 400 W peak pulse power (10/1000 µs waveform) and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for vehicle electronics.
For engineers reviewing the SMAJ48CAH datasheet, SMAJ48CAH pinout, SMAJ48CAH application, or SMAJ48CAH equivalent, this device is selected for robust overvoltage protection in DC/DC converters, lighting modules, and SMPS where AEC-Q101 qualification, low leakage (<1 µA at 48 V), and sub-1 ps response time are critical design requirements.
Technical Context
The SMAJ48CAH is a bidirectional TVS diode built on a glass-passivated silicon junction, enabling symmetrical clamping in both polarities without external polarity constraints. Its electrical behavior is defined by precise VBR min/max (53.3–58.9 V), VC of 77.4 V at IPPM = 5.2 A, and IR ≤ 1 µA at VWM = 48 V - all measured at TA = 25°C per JESD22-A114.
It operates across –55 °C to +150 °C junction temperature range, supports 40 A non-repetitive forward surge (8.3 ms half-sine), and complies with moisture sensitivity level 1 (J-STD-020), making it suitable for reflow-soldered automotive PCB assemblies requiring long-term reliability under thermal cycling and transient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; sets system DC bus rating limit. |
| VBR @ IT=1 mA | 53.3–58.9 V - Breakdown onset range; ensures predictable turn-on during transients above nominal rail. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage during 10/1000 µs surge; defines worst-case protected-circuit overvoltage. |
| PPPM | 400 W (10/1000 µs) - Peak pulse power handling; validates immunity to ISO 7637-2 Pulse 1 & 2b events. |
| IR @ VWM | ≤1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in always-on systems. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources in engine control units. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, polarity indicated by cathode band. Weight ≈ 0.060 g. Compliant with JESD201 Class 2 whisker resistance and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Transient conduction path | No functional anode/cathode distinction; terminals symmetrically clamp voltage in either polarity. |
| Cathode band marking | Polarity indicator | Visible band denotes terminal 1 per DO-214AC mechanical drawing; irrelevant for bidirectional operation but required for assembly verification. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test conditions including HTOL, TC, UHAST, and ESD-HBM/MM. |
| Fast response time | Typically <1.0 ps from 0 V to VBR min - enables suppression before sensitive ICs experience overstress. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge). |
| Glass passivated junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing. |
Applications
| Automotive Lighting Module | On-board DC/DC Converter |
|---|---|
Use Scenario: Protects LED driver ICs and MOSFETs from load dump and inductive switching spikes in headlamp/taillamp control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input rails to limit transient excursions to ≤77.4 V. Use Value: Prevents latch-up or gate oxide damage in 48 V automotive lighting systems while maintaining <1 µA standby leakage. |
Use Scenario: Shields buck controller and synchronous FETs from voltage reversals and coupling noise in 12 V → 5 V/3.3 V point-of-load converters. IC Role / Device Role / Timing Role: Fast-acting shunt protector located at DC/DC input filter stage, responding within picoseconds. Use Value: Ensures converter uptime during ISO 7637-2 Pulse 2b (battery disconnect) events without derating output capacitance. |
| Industrial SMPS Input Stage | USB-C PD Adapter Protection |
Use Scenario: Guards primary-side controller and bulk capacitor in 100–200 W industrial switch-mode power supplies subjected to AC line surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between rectified AC input and bulk cap to clamp differential-mode transients. Use Value: Absorbs 400 W pulses without degradation, supporting EN 61000-4-5 Level 3 immunity with no derating above 78 V. |
Use Scenario: Safeguards USB-C port controller and E-Marker ICs against hot-plug induced transients and cable ESD in 60 W adapters. IC Role / Device Role / Timing Role: Bidirectional rail clamp between VBUS and ground, activated before ±15 kV contact ESD reaches PHY layer. Use Value: Limits VBUS overshoot to 77.4 V during 10/1000 µs surges, preserving USB PD negotiation integrity and preventing VCONN latch-up. |
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 SMAJ48CA | Identical VWM (48 V), VBR (53.3–58.9 V), VC (77.4 V), and DO-214AC package; AEC-Q101 qualified per same test plan. | No functional difference in automotive or industrial surge environments; identical ISO 7637-2 coverage. | Select when dual-sourcing is required or Littelfuse supply chain alignment is preferred. |
| ON Semiconductor SMAJ48CA | VWM = 48 V, VBR = 53.3–58.9 V, VC = 77.4 V, same DO-214AC footprint; AEC-Q101 certified with minor variation in IR spec (≤1 µA vs ≤0.5 µA). | Same clamping performance and thermal rating; marginally lower leakage may benefit ultra-low-power always-on circuits. | Prefer for designs requiring lowest possible reverse leakage in battery-backed modules. |
Compared with SMAJ48CAH, the Littelfuse SMAJ48CA offers identical electrical and mechanical specs with full cross-qualification, while ON Semiconductor's version provides marginally tighter IR control - both serve as functionally aligned alternatives without layout changes.
Availability
SMAJ48CAH is available at Aetrix Electronics and suitable for automotive lighting modules, on-board DC/DC converters, and industrial SMPS requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ48CAH 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, and power devices since 1979.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, fast clamping response, and robust 10/1000 µs pulse handling in compact DO-214AC packaging.
FAQ
What does the "CAH" suffix indicate in SMAJ48CAH?
The "CAH" suffix in SMAJ48CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability construction (H). Unlike unidirectional "H" variants, SMAJ48CAH provides symmetrical clamping in both voltage polarities - essential for protecting AC-coupled or floating-rail circuits without polarity constraints. This makes SMAJ48CAH distinct from SMAJ48AH (unidirectional) and confirms its suitability for automotive data lines and dual-supply interfaces.
Is SMAJ48CAH compliant with ISO 7637-2, and which pulses does it cover?
Yes, SMAJ48CAH is explicitly rated to meet ISO 7637-2 for Pulse 1 (inductive load dump), Pulse 2a (sudden load removal), Pulse 2b (supply disconnection), Pulse 3a (capacitive discharge via wiring harness), and Pulse 3b (capacitive discharge to ground). This compliance is verified per the manufacturer's test report and confirmed in the datasheet's Applications section - ensuring SMAJ48CAH can protect ECUs and body control modules against real-world automotive transients without additional external filtering.
What is the maximum clamping voltage of SMAJ48CAH, and under what test condition is it specified?
The maximum clamping voltage of SMAJ48CAH is 77.4 V, measured at a peak impulse current (IPPM) of 5.2 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55 °C to +150 °C) and represents the worst-case voltage seen by downstream circuitry during a surge event - directly informing minimum breakdown margins for protected ICs and MOSFETs in the same rail.
Does SMAJ48CAH require derating above 25°C ambient, and how much peak power remains at 85°C?
Yes, SMAJ48CAH requires thermal derating above TA = 25°C per Figure 2 in the datasheet. At 85°C ambient, its peak pulse power capability drops to approximately 280 W (70% of 400 W), based on the linear derating curve. This must be accounted for in under-hood automotive applications or enclosed industrial enclosures where sustained high ambient temperatures reduce surge margin - confirming that SMAJ48CAH remains effective but with reduced headroom at elevated temperatures.
Can SMAJ48CAH replace SMAJ48AH in an existing design?
No - SMAJ48CAH cannot directly replace SMAJ48AH without circuit review. SMAJ48AH is unidirectional (anode-cathode asymmetry), while SMAJ48CAH is bidirectional (symmetric clamping). Substituting SMAJ48CAH for SMAJ48AH introduces unintended conduction paths in DC-biased rails and may compromise protection effectiveness or cause leakage in polarity-sensitive circuits. Always verify polarity requirements and clamping symmetry before interchanging SMAJ48CAH and SMAJ48AH.
SMAJ48CAH 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ48CAH FAQ
1.How can I place an order for SMAJ48CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAH 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 SMAJ48CAH reliable?
The price and inventory of SMAJ48CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CAH is usually 5 days.
3.What payment methods are accepted for SMAJ48CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAH?
SMAJ48CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAH 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 SMAJ48CAH?
For technical support, including SMAJ48CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAH requirements.
6.How does Aetrix verify that SMAJ48CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAH 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 SMAJ48CAH meets industry standards.
7.What is the process for return or replacement of SMAJ48CAH?
All SMAJ48CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAH, 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 SMAJ48CAH part is unused and in its original packaging.
Return procedure for SMAJ48CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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