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Vishay General Semiconductor - Diodes Division SMA5J18CAHE3/61
- Part No.:
- SMA5J18CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18CAHE3/61.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,945
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Product details
Overview
SMA5J18CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 μs), clamping voltage of 29.2 V at 17.1 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMA5J18CAHE3/61 datasheet, SMA5J18CAHE3/61 pinout, SMA5J18CAHE3/61 application, or SMA5J18CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and RoHS-compliant AEC-Q101 qualification for under-hood and ADAS sensor line protection.
Technical Context
This TVS diode operates symmetrically in both polarities due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and robust surge handling up to 17.1 A (10/1000 μs waveform) with low incremental surge resistance.
Thermally, it exhibits RθJA = 80 °C/W and RθJL = 25 °C/W, supporting reliable operation up to TJ = +150 °C. The device is rated for non-repetitive surge events and requires derating above 25 °C ambient per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 29.2 V at 17.1 A - Clamped voltage during 500 W surge; determines maximum stress imposed on protected IC. |
| PPPM | 500 W - Peak pulse power handling (10/1000 μs); supports IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | <1.0 μA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources in automotive ECUs. |
| MSL Level | Level 1 (J-STD-020) - No floor life limitation; compatible with standard SMT reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity: unmarked for bidirectional types; no cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping allows placement across any two points needing surge suppression. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad mounting (0.2" × 0.2") required for rated thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and floating power rails without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control, ADAS sensors, and infotainment power inputs. |
| 500 W peak pulse rating | Meets IEC 61000-4-5 (10/1000 μs) surge requirements for industrial and automotive end equipment. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
| MSL Level 1 compliance | Eliminates dry-pack requirements and floor-life tracking; simplifies SMT manufacturing logistics. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and ECU input to limit transient voltage to ≤29.2 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V ADC front-ends while maintaining signal integrity below 18 V nominal swing. | Use Scenario: Surge suppression on CAN_H/CAN_L differential pair in factory automation gateways subject to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: One SMA5J18CAHE3/61 across each line-to-ground; symmetrical clamping preserves common-mode noise rejection. Use Value: Maintains CAN FD data integrity up to 5 Mbps by limiting overshoot/undershoot without adding capacitance or propagation delay. |
| Telecom Power Input Stage | Consumer USB-C Port Protection |
Use Scenario: Secondary-side transient protection on 12 V DC input of PoE-powered network switches after DC-DC conversion. IC Role / Device Role / Timing Role: Parallel-mounted TVS across input capacitor to absorb 500 W surges from upstream cabling faults. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) without derating or parallel device stacking. | Use Scenario: Overvoltage clamp on VBUS line of USB-C receptacles in portable monitors exposed to hot-plug and adapter fault conditions. IC Role / Device Role / Timing Role: Stand-off at 18 V allows full 20 V PD negotiation range while clamping 100 V+ transients to 29.2 V. Use Value: Prevents damage to USB PD controller and port controller ICs without interfering with BC1.2 or USB PD communication timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18CA | Same VWM (18 V), identical SMA package, but not AEC-Q101 qualified; VC = 29.2 V at 17.1 A matches exactly. | Approved for commercial/industrial use only; unsuitable for automotive production without additional qualification testing. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| ON Semiconductor 1.5SMC18CA | Higher package thermal resistance (RθJA = 110 °C/W vs. 80 °C/W); same VWM/VC, but lower IPPM (16.7 A) and PPPM (400 W). | Marginally compliant with IEC 61000-4-5 Level 3; insufficient for Level 4 or automotive load dump. | Select only for space-constrained designs where 400 W rating suffices and thermal margin permits. |
Compared with SMAJ18CA and 1.5SMC18CA, the SMA5J18CAHE3/61 delivers verified AEC-Q101 qualification, superior thermal performance (RθJA = 80 °C/W), and full 500 W IEC 61000-4-5 Level 4 compliance-making it the preferred choice for automotive and high-reliability industrial deployments.
Availability
SMA5J18CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, and telecom power input stages requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMA5J18CAHE3/61 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J family is engineered for high-power-density transient suppression in harsh environments, targeting automotive powertrain, ADAS, and industrial control systems where compact size, AEC-Q101 validation, and 500 W surge capability are mandatory.
FAQ
What is the clamping voltage of the SMA5J18CAHE3/61 under a 10/1000 μs surge?
The SMA5J18CAHE3/61 clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 17.1 A (10/1000 μs waveform). This value is measured per JEDEC standards and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for protected circuitry.
Is the SMA5J18CAHE3/61 suitable for automotive applications?
Yes, the SMA5J18CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stringent requirements for under-hood environments, including operation from −55 °C to +150 °C junction temperature and robust surge immunity-making SMA5J18CAHE3/61 appropriate for engine control units and ADAS sensor modules.
Does the SMA5J18CAHE3/61 have polarity markings?
No, the SMA5J18CAHE3/61 is a bidirectional TVS diode and carries no polarity marking such as a cathode band. Its symmetrical construction allows installation in either orientation across protected lines-this is confirmed in the Vishay mechanical data section and applies specifically to all "CA"-suffixed variants like SMA5J18CAHE3/61.
What is the maximum reverse leakage current for SMA5J18CAHE3/61 at its stand-off voltage?
At VWM = 18 V and TA = 25 °C, the SMA5J18CAHE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage preserves signal integrity in high-impedance sensor interfaces and extends battery life in always-on automotive subsystems.
How does the thermal performance of SMA5J18CAHE3/61 compare to standard SMA-package TVS diodes?
The SMA5J18CAHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" copper pads-20–30 % lower than many legacy SMA TVS devices. This improved thermal efficiency directly supports sustained surge handling and higher ambient operating temperatures in dense PCB layouts.
SMA5J18CAHE3/61 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 17.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J18CAHE3/61 FAQ
1.How can I place an order for SMA5J18CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18CAHE3/61 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 SMA5J18CAHE3/61 reliable?
The price and inventory of SMA5J18CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J18CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J18CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18CAHE3/61?
SMA5J18CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18CAHE3/61 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 SMA5J18CAHE3/61?
For technical support, including SMA5J18CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18CAHE3/61 requirements.
6.How does Aetrix verify that SMA5J18CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J18CAHE3/61 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 SMA5J18CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J18CAHE3/61?
All SMA5J18CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18CAHE3/61, 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 SMA5J18CAHE3/61 part is unused and in its original packaging.
Return procedure for SMA5J18CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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