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Vishay General Semiconductor - Diodes Division SMBJ17A/54
- Part No.:
- SMBJ17A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17A/54.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,548
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Product details
Overview
SMBJ17A/54 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown range at 1 mA, clamps transients to ≤27.6 V at 21.7 A peak pulse current (10/1000 µs), and delivers 600 W peak pulse power - deployed in industrial motor drives, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ17A/54 datasheet, SMBJ17A/54 pinout, SMBJ17A/54 application, or SMBJ17A/54 equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package thermal performance (RθJA = 100 °C/W), low leakage (<1.0 µA at 17 V), and AEC-Q101 qualification availability - critical for automotive-grade transient immunity validation and board-level ESD/surge co-design.
Technical Context
The SMBJ17A/54 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to voltage transients. Its clamping behavior is defined by a 27.6 V maximum VC at IPPM = 21.7 A under standardized 10/1000 µs waveform conditions, with incremental surge resistance optimized for low-voltage overshoot during high-energy surges.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with derating applied above 25 °C ambient per Figure 2. The device is rated for 100 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and exhibits a VBR temperature coefficient of +0.090 %/°C - confirming stable breakdown across automotive and industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | ≤27.6 V at IPPM = 21.7 A (10/1000 µs) - Limits downstream IC stress during 600 W surge events. |
| IPPM (Peak Pulse Current) | 21.7 A - Sustains 600 W transient energy without failure when mounted on 5.0 mm × 5.0 mm copper pads. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM = 17 V - Negligible standby power loss and minimal impact on high-impedance sensor bias networks. |
| TJmax | +150 °C - Enables placement near heat-generating components (e.g., MOSFETs, DC-DC inductors) without derating concerns. |
| RθJA | 100 °C/W - Thermal resistance informs PCB copper area requirements for sustained 5.0 W power dissipation at elevated ambient temperatures. |
Pinout & Package
Package: SMB (DO-214AA) - surface-mount, low-profile plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, MSL Level 1 (260 °C reflow peak), and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to protected circuit ground or low-side return path; must be routed with low-inductance trace for effective surge shunting. |
| Cathode | Current exit terminal; marked by band on package body | Connected to line being protected (e.g., 12 V rail, CAN_H); polarity-critical - reverse installation disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 12 V systems without degradation when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream 24 V-rated ICs - e.g., microcontrollers, gate drivers, and analog front-ends. |
| Fast response time (<1 ns) | Activates before most semiconductor switching transients (e.g., MOSFET turn-off spikes) propagate into sensitive logic. |
| AEC-Q101 qualified option (HE3/HM3 suffix) | Validated for automotive under-hood applications including engine control units and ADAS power supplies. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow assembly - compatible with standard SMT production lines. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC bus against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping positive transients only. Use Value: Limits bus overshoot to ≤27.6 V, preventing latch-up or oxide rupture in 32-bit MCUs and isolated gate drivers. |
Use Scenario: Guarding LIN bus transceivers and window lift motor controllers against load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply input, absorbing repetitive 100 V/50 ms pulses per ISO 7637-2. Use Value: Maintains <1.0 µA leakage at 12 V, preserving battery life while surviving >1000 surge events per AEC-Q101 test plan. |
| Power-over-Ethernet (PoE) PSE | Consumer Appliance Power Supplies |
Use Scenario: Secondary-side DC output protection in IEEE 802.3af/at PSE controllers delivering up to 57 V. IC Role / Device Role / Timing Role: Unidirectional clamp on 48 V output rail, coordinated with primary-side OVP and secondary-side crowbar. Use Value: Clamps 600 W surges within 27.6 V, ensuring compliance with EN 61000-4-5 and protecting PoE PD interface ICs. |
Use Scenario: Input-stage surge suppression in 19 V laptop adapters and smart home hub AC/DC converters. IC Role / Device Role / Timing Role: Primary TVS on bulk capacitor input, absorbing differential-mode lightning-induced transients. Use Value: Withstands 21.7 A peak current without parametric shift - verified over 1000 cycles at 125 °C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17CA | Bidirectional variant with same VWM (17 V), VBR (18.9–20.9 V), and VC (27.6 V), but symmetric clamping in both polarities. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, USB D+/D−), not suitable for DC rail protection where polarity is fixed. | Select SMBJ17CA only when bidirectional surge immunity is mandated - otherwise SMBJ17A/54 offers lower cost and simpler layout. |
| SMAJ17A | Same electrical specs but in smaller SMA (DO-214AC) package; lower PPPM rating (400 W vs. 600 W) and higher RθJA (140 °C/W). | Acceptable for low-energy transients (e.g., ESD-only zones) but insufficient for IEC 61000-4-5 Level 3+ surges in industrial environments. | Choose SMAJ17A only for space-constrained consumer designs with verified <400 W surge exposure - SMBJ17A/54 remains preferred for robustness-critical applications. |
Compared with SMBJ17CA and SMAJ17A, SMBJ17A/54 provides optimal balance of 600 W surge handling, thermal reliability in SMB footprint, and unidirectional efficiency - making it the default choice for 12–24 V DC power rail protection where polarity is known and surge energy exceeds 400 W.
Availability
SMBJ17A/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and Power-over-Ethernet (PoE) power sourcing equipment requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ17A/54 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the maximum clamping voltage of SMBJ17A/54 under standard surge conditions?
The SMBJ17A/54 has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current of 21.7 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards. The SMBJ17A/54 maintains this clamping performance across its full operating temperature range, supporting reliable protection of 24 V-rated ICs.
Is SMBJ17A/54 suitable for automotive applications?
Yes - the SMBJ17A/54 is available in AEC-Q101 qualified versions (suffix HE3 or HM3), which undergo rigorous stress testing for temperature cycling, humidity, and surge endurance. While the base SMBJ17A/54 is commercial-grade, its thermal rating (TJmax = +150 °C), low leakage (<1.0 µA), and robust 600 W pulse capability make it suitable for under-dash and cabin applications. For certified deployment, specify SMBJ17AHE3/54 or SMBJ17AHM3/54.
How does SMBJ17A/54 differ from SMBJ17CA?
SMBJ17A/54 is unidirectional, with cathode band marking and clamping only for positive transients relative to ground. SMBJ17CA is bidirectional - identical VWM, VBR, and VC values but symmetric conduction in both directions. The SMBJ17A/54 cannot replace SMBJ17CA in AC-coupled circuits like RS-485 or CAN bus, where negative-going transients must also be suppressed. Their pinouts are identical, but polarity assignment differs fundamentally.
What PCB layout practices optimize SMBJ17A/54 performance?
To maximize SMBJ17A/54 effectiveness, route the anode and cathode traces with minimum length and maximum width - ideally directly to ground and protected line planes. Use ≥5.0 mm × 5.0 mm copper pads per terminal to achieve specified 600 W pulse rating and thermal dissipation. Avoid vias in TVS paths, and place the SMBJ17A/54 as close as possible to the connector or IC input it protects. The SMBJ17A/54's low inductance design delivers best results when parasitic loop inductance is kept below 10 nH.
Does SMBJ17A/54 require derating at elevated ambient temperatures?
Yes - the SMBJ17A/54 must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet (Document Number: 88392). At 75 °C ambient, its peak pulse power drops to ~420 W (70 % of 600 W), and at 125 °C, it falls to ~240 W (40 %). Derating applies to both single-pulse and repetitive surge conditions. The SMBJ17A/54's RθJA = 100 °C/W and TJmax = +150 °C define the usable thermal envelope - always verify junction temperature rise using actual board layout and airflow conditions.
SMBJ17A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ17A/54 FAQ
1.How can I place an order for SMBJ17A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17A/54 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 SMBJ17A/54 reliable?
The price and inventory of SMBJ17A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17A/54 is usually 5 days.
3.What payment methods are accepted for SMBJ17A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17A/54?
SMBJ17A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17A/54 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 SMBJ17A/54?
For technical support, including SMBJ17A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17A/54 requirements.
6.How does Aetrix verify that SMBJ17A/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ17A/54 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 SMBJ17A/54 meets industry standards.
7.What is the process for return or replacement of SMBJ17A/54?
All SMBJ17A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17A/54, 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 SMBJ17A/54 part is unused and in its original packaging.
Return procedure for SMBJ17A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17A/54 Tags
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