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Vishay General Semiconductor - Diodes Division SMAJ188CAHE3/61
- Part No.:
- SMAJ188CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHE3/61.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,085
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Product details
Overview
SMAJ188CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), 328 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), with AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SMAJ188CAHE3/61 datasheet, SMAJ188CAHE3/61 pinout, SMAJ188CAHE3/61 application, or SMAJ188CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on PCBs requiring robust ESD/lightning/surge immunity per IEC 61000-4-2/4-5.
Technical Context
This TVS diode operates as a voltage-clamping device across two terminals, responding to transient overvoltages in either polarity due to its symmetrical bidirectional structure. Its glass-passivated junction enables fast response time (<1 ns) and stable clamping performance under repetitive surge conditions.
The device delivers 400 W peak pulse power at ≤78 V and 300 W above 78 V (per derating curve), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation on standard 0.2" × 0.2" copper pads without heatsinking in most industrial and automotive layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 209 V / 231 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 328 V - clamped voltage at peak surge current, limiting downstream voltage stress |
| IPPM | 328 A - peak surge current handling with 10/1000 μs waveform, critical for IEC 61000-4-5 Level 4 compliance |
| PPPM | 400 W - peak pulse power rating (≤78 V); reduces to 300 W above 78 V per thermal derating |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| ID @ VWM | 1.0 μA - ultra-low leakage at stand-off voltage, minimizing standby power loss |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, MSL Level 1 (260 °C reflow peak), RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; accepts surge current in either direction |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical PN junction; completes bidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges per IEC 61000-4-5 up to Level 4 (4 kV line-to-line) |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated chip junction | Ensures stable VBR and low leakage over lifetime, even under high-humidity or thermal stress conditions |
| Low profile SMA package | 0.208" × 0.157" footprint supports high-density PCB layouts and automated pick-and-place assembly |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN bus power rails and supply inputs in engine control units (ECUs) and body controllers exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between VCC and GND, absorbing energy from ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2a (inductive switching). Use Value: Limits voltage to ≤328 V during 328 A surge, preventing damage to 3.3 V/5 V microcontrollers and CAN transceivers while maintaining AEC-Q101 compliance. |
Use Scenario: Shielding analog front-end inputs of pressure, temperature, or position sensors in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) shunt protector mounted directly at connector entry point, clamping transients before they reach precision ADCs or op-amps. Use Value: Maintains signal integrity with <1 ns response and minimal capacitive loading (typ. <100 pF), ensuring no distortion of mV-level sensor outputs. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Safeguarding 48 V DC input stages of PoE-powered switches, base stations, and remote radio units against induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC rail, coordinated with upstream fuses and secondary TVS arrays for staged protection architecture. Use Value: Handles 400 W pulses without degradation, sustaining repeated exposure to IEC 61000-4-5 4 kV surges while operating up to +150 °C ambient. |
Use Scenario: Protecting USB-C or barrel-jack DC inputs of smart speakers, set-top boxes, and IoT gateways from user-induced ESD and accidental AC adapter misconnection. IC Role / Device Role / Timing Role: First-line defense at board edge, placed before input filter capacitors and LDO regulators to prevent latch-up or gate oxide rupture. Use Value: Delivers 328 A surge current capacity with only 0.064 g mass and 1.98 mm height, fitting space-constrained consumer enclosures without compromising safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected when halogen-free material compliance is required by OEM spec | Choose SMAJ188CA-M3/61 if environmental compliance mandates halogen-free construction |
| SMBJ188CAHE3/61 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W) | Higher power handling enables longer surge duration tolerance; requires larger PCB footprint (0.250" × 0.157") | Choose SMBJ188CAHE3/61 when system-level surge testing exceeds 400 W or thermal margin is constrained |
Compared with SMAJ188CA-M3/61, the SMAJ188CAHE3/61 offers identical protection performance with standard RoHS compliance; versus SMBJ188CAHE3/61, it trades 200 W peak power headroom for 25 % smaller board area and lower component mass-critical for compact automotive modules and portable electronics.
Availability
SMAJ188CAHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer DC-input devices requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ188CAHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting automated manufacturing and long-term supply stability.
FAQ
What does the "CA" suffix indicate in SMAJ188CAHE3/61?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ188CAHE3/61 provides symmetrical clamping for voltage transients of either polarity. Unlike unidirectional variants (e.g., SMAJ188A), it has no cathode band marking and functions identically in both directions-ideal for AC-coupled lines or differential signal protection where polarity is undefined.
Is SMAJ188CAHE3/61 suitable for IEC 61000-4-5 Level 4 surge testing?
Yes, SMAJ188CAHE3/61 supports IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) when implemented with proper PCB layout-specifically using 0.2" × 0.2" copper pads per terminal and minimizing trace inductance. Its 328 A IPPM and 328 V VC ensure clamped voltage remains within safe limits for downstream 150 V-rated components.
How does the HE3 suffix affect the specifications of SMAJ188CAHE3/61?
The HE3 suffix indicates RoHS-compliant construction with AEC-Q101 qualification-no electrical or thermal parameter changes versus non-HE3 versions. SMAJ188CAHE3/61 retains identical VWM (188 V), VBR (209–231 V), VC (328 V), and TJ max (+150 °C), but adds automotive-grade reliability validation including temperature cycling, HAST, and mechanical shock testing.
What is the thermal resistance of SMAJ188CAHE3/61, and how does it impact layout?
SMAJ188CAHE3/61 has RθJA = 120 °C/W (junction-to-ambient) and RθJL = 30 °C/W (junction-to-lead). This means effective thermal management requires minimum 0.2" × 0.2" copper pads per terminal. For continuous 3.3 W dissipation, ambient must stay below +75 °C; for transient surges, short-duration heating is managed by the device's low thermal impedance (Fig. 5 in datasheet).
Can SMAJ188CAHE3/61 replace SMAJ188A in an existing design?
No-SMAJ188CAHE3/61 is bidirectional while SMAJ188A is unidirectional. Substituting them without circuit review risks improper clamping: SMAJ188A conducts forward current during negative transients, potentially damaging upstream sources. SMAJ188CAHE3/61 must only replace other CA-suffixed parts unless the application explicitly requires polarity-aware suppression.
SMAJ188CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 910mA
- Power - Peak Pulse:
- 300W
- 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)
SMAJ188CAHE3/61 FAQ
1.How can I place an order for SMAJ188CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHE3/61 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 SMAJ188CAHE3/61 reliable?
The price and inventory of SMAJ188CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHE3/61?
SMAJ188CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHE3/61 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 SMAJ188CAHE3/61?
For technical support, including SMAJ188CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ188CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHE3/61 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 SMAJ188CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHE3/61?
All SMAJ188CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHE3/61, 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 SMAJ188CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ188CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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