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Vishay General Semiconductor - Diodes Division SAC18-E3/54
- Part No.:
- SAC18-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SAC18-E3/54.pdf
- Description:
- TVS DIODE 18VWM 28.8VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,750
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Product details
Overview
SAC18-E3/54 from Vishay General Semiconductor is a unidirectional low-capacitance TRANSZORB® transient voltage suppressor (TVS) diode in DO-15 package, designed for clamping fast voltage transients on signal and power lines. It features 18 V working peak reverse voltage (VWM), 20.0 V minimum breakdown voltage at 1.0 mA, 28.8 V maximum clamping voltage at 5.0 A, 500 W peak pulse power (10/1000 µs), and operates from –55 °C to +175 °C junction temperature.
For engineers reviewing the SAC18-E3/54 datasheet, SAC18-E3/54 pinout, SAC18-E3/54 application, or SAC18-E3/54 equivalent, key selection criteria include clamping voltage under 5 A surge, unidirectional polarity, DO-15 mechanical compatibility, thermal derating above 25 °C, and compliance with JESD 22-B106 soldering conditions.
Technical Context
The SAC18-E3/54 employs a glass-passivated silicon junction optimized for fast response to ESD and lightning-induced transients. Its low incremental surge resistance ensures stable clamping performance during repetitive 10/1000 µs pulses at 0.01 % duty cycle, with thermal derating applied above ambient 25 °C per Figure 2 of the datasheet.
Designed for unidirectional protection only, it exhibits 5.0 µA max reverse leakage at VWM = 18 V and 50 pF typical junction capacitance at 0 V - enabling use on high-speed signal lines without signal integrity degradation. Polarity is marked by a cathode band on the DO-15 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V working peak reverse voltage - defines maximum continuous reverse bias before conduction begins |
| VBR (min) | 20.0 V at IT = 1.0 mA - ensures reliable turn-on above normal operating voltage |
| VC (max) | 28.8 V at IPP = 5.0 A - limits downstream voltage stress during surge events |
| PPPM | 500 W peak pulse power (10/1000 µs) - supports robust protection against IEC 61000-4-5 Level 4 surges |
| TJ max | +175 °C - enables operation in high-temperature industrial and automotive under-hood environments |
| Capacitance | 50 pF at 0 V - suitable for <10 Mbps data lines without significant signal attenuation |
| Polarity | Unidirectional - requires correct orientation for DC-biased circuits; not suitable for AC line protection alone |
Pinout & Package
DO-15 (DO-204AC) molded epoxy package with matte tin-plated leads; cathode indicated by color band. Body dimensions: 3.3–3.5 mm diameter × 6.15–6.55 mm length; lead length ≥25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge current sink path | Connected to protected line side; conducts surge current to ground when clamped |
| Cathode | Reverse-biased terminal / Reference node | Marked by band; connected to system ground or lower-potential rail; defines unidirectional blocking direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable long-term reliability and consistent VBR over temperature and life cycles |
| 500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial control interfaces |
| Low 50 pF junction capacitance | Minimizes loading on USB 2.0, RS-485, CAN, and sensor analog signal paths |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance and commercial-grade environmental compliance |
| UL 94 V-0 molding compound | Provides flame-retardant housing for safety-critical industrial and telecom equipment |
Applications
| Industrial Sensor Interface Protection | Automotive Power Line Clamping |
|---|---|
Use Scenario: Protecting 4–20 mA current loop transmitters and analog sensor outputs from load dump and inductive switching transients in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients within 1 ns response time. Use Value: Limits voltage excursion to ≤28.8 V during 5 A surge, preserving ADC input stages and isolator ICs downstream. | Use Scenario: Safeguarding 12 V power rails feeding infotainment ECUs and body control modules against ISO 7637-2 Pulse 1 and Pulse 2a transients. IC Role / Device Role / Timing Role: Primary clamping device across supply rail, absorbing up to 500 W for 1 ms to prevent brownout or latch-up. Use Value: Maintains 175 °C junction rating for under-hood deployment while meeting AEC-Q200 stress test thresholds. |
| USB 2.0 Data Line ESD Suppression | Telecom DSL Line Surge Protection |
Use Scenario: Adding secondary-level ESD protection on D+ and D– lines of embedded USB host ports exposed to human contact. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed in series with each data line, referenced to ground. Use Value: 50 pF capacitance avoids signal rise-time degradation; 28.8 V clamping prevents PHY damage during ±8 kV HBM ESD events. | Use Scenario: Front-end surge suppression on ADSL/VDSL line cards handling POTS/ISDN co-location with broadband signals. IC Role / Device Role / Timing Role: Paired unidirectional SAC18-E3/54 units used in back-to-back configuration for AC line protection per Figure 4. Use Value: Enables dual-direction clamping without polarity conflict; 500 W rating handles lightning-induced longitudinal surges up to 10/700 µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same VWM (18 V), higher PPPM (600 W), SMB package (smaller footprint, lower thermal mass) | Better suited for space-constrained PCBs; requires re-layout due to different pad geometry and lead spacing | Select when board area is limited and thermal coupling to copper is optimized for SMB footprint |
| P6KE18A | Same VWM (18 V), same DO-15 package, but 600 W PPPM and higher VC (32.4 V at 5 A) | Higher clamping voltage reduces protection margin for sensitive 3.3 V logic; identical mounting and soldering process | Select when legacy P6KE footprint reuse is required and 3.6 V higher clamping is acceptable |
Compared with SMBJ18A-E3/52 and P6KE18A, the SAC18-E3/54 offers tighter clamping (28.8 V vs. 32.4 V), lower capacitance (50 pF vs. 100+ pF), and optimized thermal stability for sustained surge duty - making it preferred for precision analog and high-speed digital interfaces where voltage margin and signal fidelity are critical.
Availability
SAC18-E3/54 is available at Aetrix Electronics and suitable for industrial sensor interface protection, automotive power line clamping, USB 2.0 data line ESD suppression, and telecom DSL line surge protection requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SAC18-E3/54 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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and application-specific optimization.
The SAC series is engineered specifically for low-capacitance transient suppression in signal integrity–sensitive applications, balancing clamping voltage, surge power, and package robustness for industrial, automotive, and communications infrastructure.
FAQ
What is the maximum clamping voltage of the SAC18-E3/54 at 5.0 A surge current?
The SAC18-E3/54 has a maximum clamping voltage (VC) of 28.8 V when subjected to a 5.0 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SAC18-E3/54 maintains this clamping performance across its specified operating temperature range, with minor variation accounted for in derating curves.
Is the SAC18-E3/54 suitable for bidirectional AC line protection?
No, the SAC18-E3/54 is a unidirectional TVS diode and must be used in back-to-back configuration with another unit to protect AC signal lines. As stated in the Vishay application note, two SAC18-E3/54 devices mounted in opposite polarity are required for full-cycle clamping. Using a single SAC18-E3/54 on an AC line would result in forward conduction during one half-cycle and no protection during the other.
What is the junction capacitance of the SAC18-E3/54 and how does it affect high-speed signal lines?
The SAC18-E3/54 exhibits 50 pF typical junction capacitance at 0 V, making it appropriate for data lines operating up to 10 Mbps, including RS-485, CAN FD, and USB 2.0 differential pairs. This low capacitance minimizes signal edge distortion and insertion loss. For higher-speed interfaces like USB 3.0 or PCIe, lower-capacitance alternatives such as SOD-323 packaged TVS devices are recommended instead of the DO-15 SAC18-E3/54.
Does the SAC18-E3/54 meet automotive qualification standards?
The SAC18-E3/54 is rated for operation from –55 °C to +175 °C and complies with JESD 22 reliability tests, but it is not AEC-Q200 qualified. It is designated as commercial grade (E3 suffix). For automotive applications requiring formal qualification, engineers should verify system-level validation and consider AEC-Q200–rated alternatives such as the SMAJ18A or SMCJ18A series, which share similar electrical specs but carry explicit automotive qualification.
What is the meaning of the "/54" suffix in SAC18-E3/54?
Per Vishay's ordering information, the "/54" suffix in SAC18-E3/54 indicates the preferred package code for tape-and-reel delivery: 13-inch diameter paper tape with 4000 units per reel. This packaging format supports automated SMT placement and is distinct from bulk or ammo-pack options. The "E3" denotes RoHS-compliant matte tin plating and JESD 201 Class 1A whisker resistance.
SAC18-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 28.8V
- Current - Peak Pulse (10/1000µs):
- 15A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SAC18-E3/54 FAQ
1.How can I place an order for SAC18-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAC18-E3/54 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 SAC18-E3/54 reliable?
The price and inventory of SAC18-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAC18-E3/54 is usually 5 days.
3.What payment methods are accepted for SAC18-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAC18-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAC18-E3/54?
SAC18-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAC18-E3/54 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 SAC18-E3/54?
For technical support, including SAC18-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAC18-E3/54 requirements.
6.How does Aetrix verify that SAC18-E3/54 is sourced from the original manufacturer or authorized distributors?
All SAC18-E3/54 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 SAC18-E3/54 meets industry standards.
7.What is the process for return or replacement of SAC18-E3/54?
All SAC18-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SAC18-E3/54, 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 SAC18-E3/54 part is unused and in its original packaging.
Return procedure for SAC18-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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