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Taiwan Semiconductor Corporation SMAJ26CAH
- Part No.:
- SMAJ26CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,389
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Product details
Overview
SMAJ26CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 26V working stand-off voltage, 28.9–31.9V breakdown range at 1mA, and 42.1V clamping voltage at 9.5A peak impulse current. It protects DC/DC converters and power supplies against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ26CAH datasheet, SMAJ26CAH pinout, SMAJ26CAH application, or SMAJ26CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150°C junction temperature rating, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, enabling robust protection of differential signal lines and floating power rails without polarity dependency. Its glass-passivated junction ensures stable leakage performance (<1µA at 26V) and fast response (<1.0ps), critical for suppressing fast-rising ESD and load-dump events.
The device delivers 400W peak pulse power under 10/1000µs waveform up to 78V VWM; above that, derated to 300W. It meets ISO 7637-2 immunity requirements across all five defined pulses and supports operation from –55°C to +150°C with UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 42.1 V at 9.5 A - Clamped voltage during 10/1000µs surge, defining protected circuit voltage ceiling |
| PPPM | 400 W (10/1000µs) - Peak transient energy absorption capacity for automotive load-dump suppression |
| IR @ VWM | <1 µA - Negligible leakage current ensuring minimal standby power loss in battery-critical systems |
| TJ max | +150 °C - Enables under-hood deployment in automotive power modules and engine control units |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation renders band non-functional but retained per standard marking convention). Weight: 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Bidirectional terminal pair | Identical electrical behavior in either direction; band denotes conventional cathode orientation only - no functional polarity |
| Case | Non-connection | Plastic encapsulation provides mechanical protection and UL 94V-0 flame resistance; no thermal or electrical connection to die |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and bond wire integrity |
| Glass passivated junction | Ensures long-term stability of VBR and IR under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience overstress - critical for CAN/LIN bus protection |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Guarantees immunity to real-world automotive electrical disturbances without external filtering |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or dry-pack handling - reduces manufacturing cost and risk |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN transceiver power rails from battery line transients during load dump and jump-start events. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to limit voltage excursion to ≤42.1 V. Use Value: Eliminates need for series resistors or RC filters while maintaining full signal integrity on 12 V nominal systems. |
Use Scenario: Shields isolated flyback controller ICs and optocoupler inputs from reflected surges originating in unregulated 24 V industrial supply rails. IC Role / Device Role / Timing Role: Primary-side transient absorber located between input bulk capacitor and primary FET gate driver. Use Value: Prevents false triggering and latch-up in PWM controllers during repetitive 10/1000 µs surges up to 400 W. |
| LED Headlamp Driver Unit | On-Board Charger (OBC) Auxiliary Power Supply |
Use Scenario: Safeguards constant-current LED driver ICs from ignition-induced spikes and alternator ripple coupling in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Parallel-connected TVS across input filter capacitor to clamp fast-edge transients before they propagate to analog current-sense circuitry. Use Value: Maintains ±0.5% LED current regulation accuracy by limiting voltage overshoot to <43 V during 100 ns edge events. |
Use Scenario: Secures low-voltage auxiliary supply (5 V/3.3 V) feeding MCU, CAN transceivers, and sensors in EV on-board chargers. IC Role / Device Role / Timing Role: Final-stage protection device after DC/DC conversion, placed immediately upstream of LDO regulators. Use Value: Guarantees uninterrupted operation during ISO 7637-2 Pulse 3b (capacitive coupled burst) with <1 µA leakage at 26 V. |
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 SMAJ26CA | Same DO-214AC package, identical VWM/VBR/VC specs, AEC-Q101 qualified, but marked "SMAJ26CA" (no "H" suffix); RoHS/halogen-free compliance verified per Littelfuse documentation | No functional difference in circuit design or layout; same mounting and reflow profile | Select when sourcing from Littelfuse-authorized channels or requiring alternate logistics path |
| Vishay SMAJ26CAHE3/5A | DO-214AC package, AEC-Q101 qualified, same 26 V VWM and 42.1 V VC, but specified with enhanced moisture resistance (MSL 1 per J-STD-020) and tighter VBR tolerance (±5% vs ±10% typical) | Better suited for high-humidity environments or extended storage prior to assembly | Prefer for sealed enclosures or tropical-climate deployments where long-term IR stability is critical |
Compared with SMAJ26CAH, Littelfuse SMAJ26CA offers identical electrical and mechanical performance with equivalent automotive qualification, while Vishay SMAJ26CAHE3/5A adds tighter parametric control and enhanced MSL assurance - both require no PCB changes but differ in traceability and long-term reliability validation scope.
Availability
SMAJ26CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting drivers, and on-board charger auxiliary supplies requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ26CAH 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 with global distribution and AEC-Q101 certification capability.
The SMAJxxCAH series was developed specifically for automotive and industrial transient suppression, emphasizing robustness under ISO 7637-2 stress, high-temperature reliability, and compatibility with high-speed SMT assembly lines.
FAQ
What does the "CAH" suffix indicate in SMAJ26CAH?
The "CAH" suffix in SMAJ26CAH denotes a bidirectional TVS diode (C = bidirectional), AEC-Q101 qualified (A), and halogen-free construction (H). This distinguishes it from unidirectional "AH" variants and confirms compliance with automotive reliability and environmental standards required for under-hood applications.
Is SMAJ26CAH pin-compatible with SMAJ26AHE3/5A from Vishay?
Yes, SMAJ26CAH is mechanically and electrically pin-compatible with Vishay SMAJ26AHE3/5A - both use DO-214AC (SMA) package with identical footprint, lead pitch, and bidirectional terminal configuration. No PCB redesign is needed, though Vishay's variant specifies tighter VBR tolerance and enhanced MSL rating.
What is the maximum clamping voltage of SMAJ26CAH under a 10/1000µs surge?
The maximum clamping voltage of SMAJ26CAH under a 10/1000µs surge is 42.1 V at 9.5 A peak impulse current. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuits during transient events.
Does SMAJ26CAH meet ISO 7637-2 Pulse 3b requirements?
Yes, SMAJ26CAH meets ISO 7637-2 Pulse 3b (capacitive coupled burst) requirements as part of its full ISO 7637-2 compliance covering Pulses 1, 2a, 2b, 3a, and 3b. Its sub-1µA leakage at 26 V and fast response ensure effective suppression of repetitive low-energy transients common in vehicle communication networks.
Can SMAJ26CAH be used in place of SMAJ26AH in a new design?
No - SMAJ26AH is unidirectional, while SMAJ26CAH is bidirectional. Substituting SMAJ26CAH for SMAJ26AH requires verifying that the protected circuit has no inherent polarity constraints (e.g., DC-biased signal lines). In floating or AC-coupled paths, SMAJ26CAH provides broader protection coverage without polarity concerns.
SMAJ26CAH 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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)
SMAJ26CAH FAQ
1.How can I place an order for SMAJ26CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAH 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 SMAJ26CAH reliable?
The price and inventory of SMAJ26CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CAH is usually 5 days.
3.What payment methods are accepted for SMAJ26CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAH?
SMAJ26CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAH 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 SMAJ26CAH?
For technical support, including SMAJ26CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAH requirements.
6.How does Aetrix verify that SMAJ26CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAH 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 SMAJ26CAH meets industry standards.
7.What is the process for return or replacement of SMAJ26CAH?
All SMAJ26CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAH, 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 SMAJ26CAH part is unused and in its original packaging.
Return procedure for SMAJ26CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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