My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ188CAHE3/5A
- Part No.:
- SMAJ188CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAHE3/5A.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,898
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ188CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 328 V at 0.91 A peak pulse current (10/1000 μs), with 188 V stand-off voltage and 400 W peak pulse power rating (derated to 300 W above 78 V). It protects sensitive signal lines and power rails in automotive, industrial, and telecom systems against ESD, lightning surges, and inductive switching spikes.
For engineers reviewing the SMAJ188CAHE3/5A datasheet, SMAJ188CAHE3/5A pinout, SMAJ188CAHE3/5A application, or SMAJ188CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 120 °C/W junction-to-ambient thermal resistance, low leakage (<1.0 μA at 188 V), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche breakdown when reverse voltage exceeds its 188 V stand-off threshold, limiting transient energy by diverting surge current to ground. Its bidirectional symmetry enables use on AC-coupled or floating signal paths without polarity concerns.
It features glass-passivated junction construction for stable breakdown characteristics, meets MSL Level 1 per J-STD-020, and supports reflow soldering up to 260 °C peak. The device is rated for -55 °C to +150 °C operating junction temperature and exhibits a typical 0.108 %/°C temperature coefficient of breakdown voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 188 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for protected circuitry. |
| Breakdown Voltage (VBR min/max) | 209 V / 231 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 328 V at IPPM = 0.91 A (10/1000 μs) - Peak voltage seen by downstream circuit during worst-case surge; determines required voltage headroom. |
| Peak Pulse Power (PPPM) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity under standardized waveform; defines protection level for IEC 61000-4-5 compliance testing. |
| Reverse Leakage (ID) | ≤1.0 μA at 188 V - Negligible standby current draw; avoids loading of high-impedance sensor or reference circuits. |
| Junction Temperature Range | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom enclosures. |
| Thermal Resistance (RθJA) | 120 °C/W - Predicts junction temperature rise under DC power dissipation; informs PCB copper pad sizing for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Meets UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards. No polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path | Bidirectional terminals-either end serves as cathode or anode depending on transient polarity; no functional distinction in layout. |
| Anode (Cathode) | Transient current return path | Identical to opposite terminal; symmetric conduction enables placement across differential or AC signals without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness-enables use in ADAS, body control, and infotainment modules. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge events (4 kV line-earth, 2 kV line-line) when properly mounted on 5 mm × 5 mm copper pads. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge), improving protection fidelity. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking-reduces manufacturing overhead in high-volume SMT lines. |
| Glass passivated junction | Ensures stable VBR over time and temperature, with <0.1 %/°C drift-critical for long-lifetime industrial equipment and EV charging infrastructure. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load-dump and jump-start induced transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential bus lines to limit voltage excursions to <330 V during 12 V system surges. Use Value: Prevents latch-up or permanent damage to transceiver ICs while maintaining signal integrity due to sub-1 nF junction capacitance. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring faults and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input channel and common rail to clamp transients before reaching optocoupler or MCU GPIO. Use Value: Enables >100,000 surge cycles without degradation, supporting 15+ year service life in factory automation environments. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD Guard |
|
Use Scenario: Shielding Ethernet PHY front-end and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on RJ45 magnetics secondary side, coordinated with GDT and MOV for multi-stage protection. Use Value: Fast response (<1 ns) and precise 188 V standoff prevent false triggering during normal 100BASE-TX signaling while blocking >6 kV surges. |
Use Scenario: Adding secondary-side surge immunity to USB-C PD adapters and wireless charger control boards. IC Role / Device Role / Timing Role: Clamping component across 5–20 V output rails to absorb ESD events from user port insertion and cable coupling. Use Value: RoHS-compliant and halogen-free (HE3 suffix) meets global regulatory requirements for consumer electronics without compromising clamping performance. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No difference in protection function or layout; selected where halogen-free material compliance is mandated. | Choose for green manufacturing programs requiring IEC 61249-2-21 compliance. |
| SMAJ188AHE3/5A | Unidirectional version-cathode-marked, forward voltage drop (~3.5 V @ 25 A), higher ID leakage at VWM. | Requires polarity-aware placement; unsuitable for AC or floating signal paths but offers lower forward conduction loss in DC power rail protection. | Select only when protecting unidirectional DC supplies where reverse conduction must be blocked. |
Compared with SMAJ188CAHE3/5A, the M3/5A alternative provides identical protection performance with halogen-free packaging, while the unidirectional SMAJ188AHE3/5A requires careful polarity alignment and introduces forward voltage drop-making it less suitable for bidirectional interfaces like CAN or Ethernet but viable for dedicated DC rail clamping.
Availability
SMAJ188CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer power adapter designs requiring stable component supply, AEC-Q101 validation, and long-term lifecycle support.
Supply support for SMAJ188CAHE3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping, thermal stability, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ188CAHE3/5A at its rated peak pulse current?
The SMAJ188CAHE3/5A has a maximum clamping voltage (VC) of 328 V when subjected to its peak pulse current (IPPM) of 0.91 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ188CAHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ188CAHE3/5A suitable for automotive applications?
Yes, SMAJ188CAHE3/5A is AEC-Q101 qualified and explicitly rated for automotive use. Its construction-including glass-passivated junction, MSL Level 1 rating, and operation from -55 °C to +150 °C-meets stringent automotive reliability requirements. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification, making SMAJ188CAHE3/5A appropriate for engine control units, ADAS sensors, and body electronics.
How does the bidirectional design of SMAJ188CAHE3/5A affect PCB layout?
The bidirectional nature of SMAJ188CAHE3/5A eliminates polarity constraints during placement-no cathode band marking is present, and either terminal functions identically under positive or negative transients. This simplifies layout for differential interfaces (e.g., CAN, RS-485) and AC-coupled signal paths, allowing symmetric routing without orientation checks. The SMAJ188CAHE3/5A can be placed across any two nodes requiring symmetrical overvoltage protection.
What is the thermal resistance and how does it impact heatsinking for SMAJ188CAHE3/5A?
SMAJ188CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads. This value assumes no additional heatsinking; for sustained power dissipation, larger copper areas or internal layers improve thermal performance. Since SMAJ188CAHE3/5A is intended for transient-not continuous-dissipation, heatsinking is rarely required unless used in repetitive surge scenarios.
Does SMAJ188CAHE3/5A meet industry surge immunity standards such as IEC 61000-4-5?
Yes, SMAJ188CAHE3/5A supports compliance with IEC 61000-4-5 when implemented with proper PCB layout-specifically using 5.0 mm × 5.0 mm copper pads per terminal and coordinated with upstream filtering. Its 400 W (≤78 V) / 300 W (>78 V) peak pulse power rating aligns with Level 3 (2 kV line-earth) and Level 4 (4 kV line-earth) test requirements. System-level validation is required, but SMAJ188CAHE3/5A forms a validated first stage in multi-tier protection architectures.
SMAJ188CAHE3/5A 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)
SMAJ188CAHE3/5A FAQ
1.How can I place an order for SMAJ188CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAHE3/5A 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 SMAJ188CAHE3/5A reliable?
The price and inventory of SMAJ188CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ188CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAHE3/5A?
SMAJ188CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAHE3/5A 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 SMAJ188CAHE3/5A?
For technical support, including SMAJ188CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ188CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAHE3/5A 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 SMAJ188CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ188CAHE3/5A?
All SMAJ188CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAHE3/5A, 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 SMAJ188CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ188CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188CAHE3/5A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
