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Taiwan Semiconductor Corporation SMBJ170CAH
- Part No.:
- SMBJ170CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CAH.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,460
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Product details
Overview
SMBJ170CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 170 V working stand-off voltage (VWM), 189–209 V breakdown voltage (VBR), 2.2 A peak pulse current (IPP), 275 V maximum clamping voltage (VC), and 600 W peak pulse power (PPK) with <1.0 ps response time.
For engineers reviewing the SMBJ170CAH datasheet, SMBJ170CAH pinout, SMBJ170CAH application, or SMBJ170CAH equivalent, key selection criteria include bidirectional clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification, low leakage (<1 µA at 170 V), and compatibility with automated SMT placement on 12 V–48 V DC systems requiring robust transients immunity.
Technical Context
The SMBJ170CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bipolar configurations. Its symmetrical breakdown behavior (VBR min/max = 189/209 V in both directions) ensures consistent clamping during positive and negative surges without polarity dependency.
Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation up to TJ = 150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, confirming suitability for reflow-soldered automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 189–209 V - Confirmed symmetric breakdown threshold in both directions |
| VC @ IPP=2.2 A | 275 V - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 600 W - Peak non-repetitive surge power handling per IEC 61000-4-5 / ISO 7637-2 |
| ID @ VWM | <1 µA - Low leakage preserves system efficiency in high-impedance bias networks |
| Response time | <1.0 ps - Sub-nanosecond junction reaction enables protection of fast-edge digital interfaces |
| TJ max | +150 °C - Rated junction temperature supports under-hood automotive deployment |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; bidirectional symmetry means no anode/cathode orientation required-both terminals are functionally identical for transient clamping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path | Provides low-impedance shunt to ground or rail during overvoltage events in either polarity |
| Cathode (unmarked side) | Transient return path | Functionally identical to anode due to bidirectional construction; no polarity dependency in circuit layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHAST |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| ISO 7637-2 compliance | Rated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance stabilization) |
| Level 1 MSL rating | Zero bake requirement prior to reflow; compatible with standard PCB assembly processes |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power lines against load-dump transients and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across VBAT and GND to limit surge energy before it reaches PMICs and CAN transceivers. Use Value: With 275 V clamping at 2.2 A, SMBJ170CAH holds downstream ICs below 300 V stress during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding analog input channels of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each 0–10 V or 4–20 mA channel to absorb EFT bursts and lightning-induced coupling. Use Value: Sub-1 ps response ensures clamping activation before microsecond-scale EFT pulses (IEC 61000-4-4) propagate into precision ADC front-ends. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Stage |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers subjected to 12 V supply line transients. IC Role / Device Role / Timing Role: Placed across input capacitor to clamp spikes generated by relay switching or nearby motor commutation. Use Value: 600 W PPK rating absorbs multiple 10/1000 µs surges without degradation, extending driver lifetime in streetlight and signage systems. | Use Scenario: Shielding buck controller ICs from input rail overshoot during hot-swap or battery connection events. IC Role / Device Role / Timing Role: Front-end TVS on VIN pin of DC-DC modules operating from 48 V telecom or server power distribution networks. Use Value: 170 V VWM allows stable operation across full 48 V ±10% range while clamping >200 V transients to safe levels for 65 V-rated input capacitors. |
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 SMAJ170CA | Same DO-214AC (SMA) package; slightly higher VC (285 V @ 2.1 A); lower PPK (400 W) | Lower power handling limits use in high-energy automotive load-dump scenarios | Select when footprint constraints favor SMA or when lower clamping voltage tolerance permits marginally higher VC |
| Vishay SMA6J170A | DO-214AC (SMA) package; 170 V VWM; VC = 274 V @ 2.2 A; AEC-Q101 qualified | Identical clamping performance but different thermal resistance (RθJA = 65 °C/W vs. 55 °C/W) | Prefer for space-constrained layouts where SMA fits, but verify thermal derating in enclosed enclosures |
Compared with SMAJ170CA and SMA6J170A, SMBJ170CAH offers superior 600 W surge capability and lower thermal resistance in the larger DO-214AA (SMB) package-making it optimal for high-reliability 24–48 V systems where board area permits and sustained surge energy is critical.
Availability
SMBJ170CAH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, LED driver overvoltage clamping, and DC-DC converter input stage surge suppression requiring stable component supply across extended production cycles.
Supply support for SMBJ170CAH 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 Taiwanese manufacturer specializing in discrete power semiconductors, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment 12–170 V DC systems, emphasizing low leakage, symmetrical bipolar clamping, and robust reflow survivability.
FAQ
What does the 'CAH' suffix indicate in SMBJ170CAH?
The 'CAH' suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional variants (e.g., SMBJ170H), SMBJ170CAH provides symmetrical clamping in both polarities-essential for AC-coupled or floating-rail protection where voltage reversals occur. This makes SMBJ170CAH suitable for applications like CAN bus power lines or differential signal protection where polarity cannot be assumed.
Is SMBJ170CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ170CAH is fully compatible with standard lead-free reflow profiles (per J-STD-020 Level 1). Its matte tin-plated leads meet J-STD-002 solderability requirements, and the device has been validated for peak temperatures up to 260 °C. The DO-214AA (SMB) package's thermal mass and glass passivation ensure mechanical and electrical integrity through multiple reflow cycles-critical for high-yield automotive PCB assembly where SMBJ170CAH is commonly deployed.
How does SMBJ170CAH perform under ISO 7637-2 Pulse 5a (load dump)?
SMBJ170CAH is explicitly rated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b-but not Pulse 5a, which exceeds its 600 W PPK rating. For load dump protection, SMBJ170CAH is typically paired with a series resistor or used downstream of a dedicated load-dump suppressor. Its 275 V clamping voltage at 2.2 A ensures effective secondary protection when upstream devices handle the bulk energy, making SMBJ170CAH a robust choice for layered surge defense in automotive power domains.
What is the maximum steady-state power dissipation (PD) for SMBJ170CAH?
The maximum steady-state power dissipation (PD) for SMBJ170CAH is 3 W at TA = 25 °C, as specified in the Absolute Maximum Ratings table. This value derates linearly above 25 °C per the Pulse Derating Curve (Fig. 2), reaching ~1.5 W at 75 °C ambient. Engineers must ensure PCB copper area and airflow maintain junction temperature ≤150 °C-especially important in sealed automotive junction boxes where SMBJ170CAH may operate continuously near its thermal limit during prolonged overvoltage conditions.
Can SMBJ170CAH replace SMBJ170AH in an existing design?
No-SMBJ170CAH and SMBJ170AH are not interchangeable without validation. SMBJ170AH is unidirectional (cathode-marked), while SMBJ170CAH is bidirectional (no polarity marking). Swapping them risks incorrect clamping behavior in DC-biased circuits. Additionally, SMBJ170CAH has VC = 275 V @ 2.2 A, whereas SMBJ170AH specifies VC = 304 V @ 2.0 A-resulting in different stress levels on downstream components. Always verify polarity, clamping profile, and system-level surge testing before substituting SMBJ170CAH for SMBJ170AH.
SMBJ170CAH 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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- 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)
SMBJ170CAH FAQ
1.How can I place an order for SMBJ170CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CAH 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 SMBJ170CAH reliable?
The price and inventory of SMBJ170CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CAH is usually 5 days.
3.What payment methods are accepted for SMBJ170CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CAH?
SMBJ170CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CAH 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 SMBJ170CAH?
For technical support, including SMBJ170CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CAH requirements.
6.How does Aetrix verify that SMBJ170CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ170CAH 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 SMBJ170CAH meets industry standards.
7.What is the process for return or replacement of SMBJ170CAH?
All SMBJ170CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CAH, 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 SMBJ170CAH part is unused and in its original packaging.
Return procedure for SMBJ170CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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