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Taiwan Semiconductor Corporation SMBJ54AH
- Part No.:
- SMBJ54AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54AH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
SMBJ54AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 54 V working stand-off voltage (VWM), 60.0–66.3 V breakdown voltage (VBR) at 1 mA test current, 87.1 V maximum clamping voltage (VC) at 7.2 A peak pulse current (IPP), and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ54AH datasheet, SMBJ54AH pinout, SMBJ54AH application, or SMBJ54AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, leakage current ≤1 µA at 54 V, and thermal resistance (RθJA = 55 °C/W) for board-level thermal design in 12 V/24 V automotive subsystems.
Technical Context
The SMBJ54AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with sub-nanosecond response. Its clamping behavior follows IEEE C62.35 standards, delivering consistent VC = 87.1 V at IPP = 7.2 A under 10/1000 µs waveform, with junction temperature rated from –55 °C to +150 °C.
It is optimized for DC power line protection where low leakage (<1 µA @ VWM) and stable VBR tolerance (±10.5% typical) are critical. The device supports automated SMT placement, meets JESD201 Class 2 whisker resistance, and complies with RoHS and halogen-free requirements per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; sets system overvoltage trip threshold for 12 V/24 V automotive rails. |
| VBR min/max | 60.0 / 66.3 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM; ±5.5% tolerance enables predictable protection window. |
| VC @ IPP | 87.1 V @ 7.2 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe levels in load-dump or EFT events. |
| PPK | 600 W - Peak pulse power handling per single transient; validated per Fig. 3 waveform, enabling robustness against ISO 7637-2 Pulse 5a (load dump). |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves battery drain budget in always-on vehicle modules (e.g., CAN transceivers, body control units). |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in under-hood environments without derating at ambient ≤125 °C. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance defines PCB copper area requirement for sustained power dissipation in high-reliability designs. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input return path for transient energy | Connected to protected circuit ground or low-side rail; completes clamping loop during positive surge events. |
| Cathode | Protected line connection point | Connected to power rail (e.g., 12 V battery feed); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and infotainment systems. |
| Glass-passivated junction | Enables stable VBR and low leakage across lifetime; prevents moisture-induced degradation in humid under-hood environments. |
| Clamping voltage ≤87.1 V @ 7.2 A | Provides 33% headroom below 120 V absolute max for downstream 100 V-rated MOSFETs or regulators in 24 V systems. |
| Response time <1.0 ps | Ensures suppression initiates before ESD or EFT transients propagate into sensitive analog front-ends or microcontroller I/O pins. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) - covers full automotive EMC immunity scope. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply lines in body control modules (BCM), lighting drivers, and HVAC controllers from load dump and jump-start surges. IC Role / Device Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp transients before reaching PMICs and MCU power inputs. Use Value: Limits peak rail voltage to ≤87.1 V during 600 W surges, preventing latch-up or burnout of 3.3 V/5 V logic supplies downstream. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role: Front-end transient suppressor on 24 V DC input terminals, absorbing repetitive EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity by holding clamped voltage below 90 V, ensuring optocoupler or Schmitt-trigger input thresholds remain unbreached. |
| Automotive CAN Transceiver Protection | LED Driver Overvoltage Suppression |
|
Use Scenario: Shielding high-speed CAN FD transceivers (e.g., TJA1044) from battery line coupling during ignition or alternator regulation faults. IC Role / Device Role: Secondary protection stage after common-mode choke, placed on VCC pin to absorb differential-mode surges exceeding primary filter capability. Use Value: Delivers 87.1 V clamping at 7.2 A with <1 ps response, preserving CAN bus signal rise/fall times and minimizing bit error rate under ISO 7637-2 Pulse 5a. |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers in automotive exterior lighting subjected to 12 V battery reversal or jump-start spikes. IC Role / Device Role: Reverse-polarity and overvoltage protector on driver input, conducting fault current away from internal FETs and sense resistors. Use Value: Withstands 600 W single pulses and maintains <1 µA leakage at 54 V, eliminating standby current penalty while enabling fail-safe open-circuit detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54A | Same VWM (54 V), but wider VBR range (60.0–73.3 V); higher VC = 96.3 V @ 6.5 A; no AEC-Q101 qualification. | Lacks automotive qualification; suitable only for industrial or consumer-grade 24 V systems without ISO 7637-2 compliance requirements. | Select SMBJ54A only if AEC-Q101 is not mandated and higher clamping voltage is acceptable for downstream component ratings. |
| SAC54 | Same VWM (54 V), bidirectional configuration; VBR = 60.0–66.3 V (both polarities); VC = 93.6 V @ 6.7 A; AEC-Q101 qualified. | Supports AC-coupled or floating-rail applications (e.g., sensor bridges, RS-485 lines); clamps both positive and negative transients. | Choose SAC54 when protecting bidirectional signals or ungrounded circuits; SMBJ54AH remains optimal for unidirectional DC rail protection. |
Compared with SMBJ54A and SAC54, the SMBJ54AH offers the tightest VBR tolerance (60.0–66.3 V), lowest clamping voltage (87.1 V), and AEC-Q101 validation - making it the preferred choice for safety-critical 24 V automotive power domains requiring precise, repeatable surge suppression.
Availability
SMBJ54AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and LED lighting systems requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMBJ54AH 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-compliant production lines.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing low clamping voltage, fast response, and robust thermal performance in compact SMB packages for space-constrained ECUs and control units.
FAQ
What is the maximum clamping voltage of SMBJ54AH under standard 10/1000 µs surge conditions?
The SMBJ54AH has a maximum clamping voltage (VC) of 87.1 V when subjected to a 10/1000 µs waveform at a peak impulse current (IPP) of 7.2 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the official Taiwan Semiconductor datasheet revision A2102, ensuring predictable overvoltage limiting for downstream 100 V-rated components in 24 V systems.
Is SMBJ54AH qualified for automotive applications per AEC-Q101?
Yes, SMBJ54AH is explicitly AEC-Q101 qualified, as stated in the "FEATURES" section of the Taiwan Semiconductor datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, confirming its suitability for under-hood and chassis-mounted automotive modules such as BCMs and lighting controllers.
How does SMBJ54AH differ from SMBJ54H in terms of electrical performance?
SMBJ54AH has a tighter breakdown voltage range (60.0–66.3 V) versus SMBJ54H (60.0–73.3 V), resulting in lower clamping voltage (87.1 V vs. 96.3 V) and higher peak surge current rating (7.2 A vs. 6.5 A). Both share identical VWM (54 V) and PPK (600 W), but SMBJ54AH delivers superior precision and energy-handling consistency for critical automotive rails.
What is the leakage current specification for SMBJ54AH at its working stand-off voltage?
The SMBJ54AH exhibits a maximum blocking leakage current (ID) of ≤1 µA at its working stand-off voltage (VWM) of 54 V, measured at TA = 25°C. This ultra-low leakage is critical for battery-powered or always-on automotive subsystems, minimizing parasitic drain while maintaining rapid avalanche response during transients.
Does SMBJ54AH support automated SMT assembly, and what is its moisture sensitivity level?
Yes, SMBJ54AH is optimized for automated placement with JEDEC-standard DO-214AA (SMB) packaging and matte tin-plated leads compliant with J-STD-002. Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without dry-pack requirements - simplifying manufacturing logistics and reducing floor-life constraints.
SMBJ54AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ54AH FAQ
1.How can I place an order for SMBJ54AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54AH 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 SMBJ54AH reliable?
The price and inventory of SMBJ54AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54AH is usually 5 days.
3.What payment methods are accepted for SMBJ54AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54AH?
SMBJ54AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54AH 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 SMBJ54AH?
For technical support, including SMBJ54AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54AH requirements.
6.How does Aetrix verify that SMBJ54AH is sourced from the original manufacturer or authorized distributors?
All SMBJ54AH 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 SMBJ54AH meets industry standards.
7.What is the process for return or replacement of SMBJ54AH?
All SMBJ54AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54AH, 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 SMBJ54AH part is unused and in its original packaging.
Return procedure for SMBJ54AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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