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Taiwan Semiconductor Corporation SMBJ54CAH
- Part No.:
- SMBJ54CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54CAH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,397
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Product details
Overview
SMBJ54CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 54 V working stand-off voltage (VWM), 600 W peak pulse power rating (PPK), clamping voltage of 87.1 V at 7.2 A peak current, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMBJ54CAH datasheet, SMBJ54CAH pinout, SMBJ54CAH application, or SMBJ54CAH equivalent, key selection criteria include bidirectional clamping performance, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package compatibility, and leakage current ≤1 µA at 54 V.
Technical Context
The SMBJ54CAH operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling robust protection against reverse- and forward-polarity transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR (60.0–66.3 V) and low leakage (<1 µA at VWM), while the 10/1000 µs waveform response supports fast transient suppression per IEC 61000-4-5.
Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W, allowing reliable operation up to TJ = 150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, confirming suitability for lead-free reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 60.0 / 66.3 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold |
| VC @ IPP | 87.1 V at 7.2 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum overvoltage |
| PPK | 600 W - Peak transient power dissipation capability; validates immunity to ISO 7637-2 Pulse 3b (50 V/µs) |
| ID @ VWM | <1 µA - Low leakage preserves system standby current and avoids false triggering |
| Package | DO-214AA (SMB) - Standard surface-mount outline with 0.090 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity-indicating band denotes terminal 1 (anode/cathode reference for unidirectional variants; symmetric for bidirectional SMBJ54CAH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | Common connection point; symmetric conduction in both directions; no polarity dependency |
| Terminal 2 | Cathode (bidirectional) | Common connection point; identical electrical behavior to Terminal 1; marked with cathode band for orientation only |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD/coupled noise) |
| Fast response time | <1.0 ps - Enables clamping before transient energy couples into downstream ICs |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life handling |
| Moisture sensitivity level 1 | No floor life limitation; safe for standard SMT reflow without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits voltage to ≤87.1 V during 7.2 A transients, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD events on factory-floor wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transients between signal line and ground near connector entry point. Use Value: Sub-1 µA leakage avoids loading high-impedance sensor outputs; 600 W rating absorbs contact discharge per IEC 61000-4-2. |
| LED Lighting Driver Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding constant-current LED drivers from inductive switching spikes generated by relay or MOSFET control circuits. IC Role / Device Role / Timing Role: TVS connected across driver output terminals to absorb flyback energy from inductive loads. Use Value: 87.1 V clamping prevents overvoltage stress on driver FETs rated for 100 V drain-source breakdown. | Use Scenario: Protecting RS-485 transceivers on outdoor telecom nodes exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across A/B bus lines and common-mode to ground. Use Value: Symmetrical 60.0–66.3 V VBR ensures balanced clamping in both polarities, preserving signal integrity during ±1 kV surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54CA | Same VWM (54 V), VBR (60.0–66.3 V), and PPK (600 W); differs only in AEC-Q101 qualification status - SMBJ54CAH is qualified, SMBJ54CA is not | Not suitable for automotive safety-critical modules requiring AEC-Q101 evidence | Select SMBJ54CAH when automotive qualification and ISO 7637-2 compliance are mandatory |
| SAC54CA | Same DO-214AA package and bidirectional configuration; lower PPK (400 W); higher VC (93.6 V at 5.4 A) | Insufficient for 600 W surge requirements such as ISO 7637-2 Pulse 1 (12 V systems) | Choose SMBJ54CAH where full 600 W immunity and tighter clamping (87.1 V vs. 93.6 V) are required |
Compared with SMBJ54CA and SAC54CA, the SMBJ54CAH delivers certified automotive reliability, superior 600 W surge handling, and lower clamping voltage-making it the preferred choice for demanding 12 V/24 V automotive and industrial power rail protection.
Availability
SMBJ54CAH is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interfaces, LED lighting driver circuits, and telecom line protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ54CAH 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 validation capabilities.
The SMBJH series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing robust clamping, low leakage, and process-controlled glass-passivated junctions for consistent VBR tolerance.
FAQ
What does the "CAH" suffix indicate in SMBJ54CAH?
The "CAH" suffix in SMBJ54CAH denotes a bidirectional TVS diode (C), AEC-Q101 qualified (A), and part of the high-reliability SMBJH series (H). Unlike unidirectional variants (e.g., SMBJ54H), SMBJ54CAH provides symmetrical clamping in both polarities and carries formal AEC-Q101 certification for automotive use.
Is SMBJ54CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ54CAH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AA (SMB) package is rated for MSL Level 1 per J-STD-020-meaning no moisture preconditioning is needed prior to assembly.
How does SMBJ54CAH perform under ISO 7637-2 Pulse 3b conditions?
SMBJ54CAH is explicitly validated for ISO 7637-2 Pulse 3b (capacitive coupling, 150 Ω source impedance). With its 600 W PPK rating and 87.1 V clamping voltage at 7.2 A, it limits induced transients to safe levels for 12 V/24 V systems, preventing damage to downstream regulators and microcontrollers.
What is the maximum junction temperature for SMBJ54CAH during surge events?
The absolute maximum junction temperature for SMBJ54CAH is +150 °C. Under repetitive surge conditions, thermal derating per Figure 2 must be applied; at 125 °C ambient, the device retains ~50% of its 600 W PPK rating due to RθJA = 55 °C/W and RθJC = 10 °C/W thermal resistance.
Can SMBJ54CAH replace SMBJ54A in an existing design?
SMBJ54CAH can replace SMBJ54A only if AEC-Q101 qualification and ISO 7637-2 compliance are required. Electrically, both share identical VWM (54 V), VBR (60.0–66.3 V), and PPK (600 W), but SMBJ54A lacks AEC-Q101 certification and may not meet automotive audit requirements for SMBJ54CAH's target applications.
SMBJ54CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ54CAH FAQ
1.How can I place an order for SMBJ54CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54CAH 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 SMBJ54CAH reliable?
The price and inventory of SMBJ54CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54CAH is usually 5 days.
3.What payment methods are accepted for SMBJ54CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54CAH?
SMBJ54CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54CAH 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 SMBJ54CAH?
For technical support, including SMBJ54CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54CAH requirements.
6.How does Aetrix verify that SMBJ54CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ54CAH 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 SMBJ54CAH meets industry standards.
7.What is the process for return or replacement of SMBJ54CAH?
All SMBJ54CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54CAH, 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 SMBJ54CAH part is unused and in its original packaging.
Return procedure for SMBJ54CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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