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Vishay General Semiconductor - Diodes Division SA18-E3/54
- Part No.:
- SA18-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA18-E3/54.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,403
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Product details
Overview
SA18-E3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 10 mA), 29.2 V maximum clamping voltage (VC) at 17.1 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - used in automotive body control modules, industrial PLC I/O protection, and DC power supply input stages.
For engineers reviewing the SA18-E3/54 datasheet, SA18-E3/54 pinout, SA18-E3/54 application, or SA18-E3/54 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-15 mechanical dimensions, clamping behavior under surge, and direct alternatives for ESD/surge protection design-in.
Technical Context
The SA18-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient events and low incremental surge resistance. Its uni-directional polarity uses a cathode band marking and supports reverse-biased clamping only - forward conduction is limited to 3.5 V at 100 A surge.
Rated for -55 °C to +175 °C junction temperature, it delivers 3.0 W steady-state power dissipation on infinite heatsink at 75 °C lead temperature and meets JESD 201 Class 1A whisker resistance. It is RoHS-compliant and qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets DC rail protection threshold. |
| VBR (min/max) | 20.0 V / 22.1 V at 10 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC @ IPPM | 29.2 V at 17.1 A - Clamped voltage during 10/1000 μs surge; defines worst-case stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling per single transient; validated per Fig. 1 in datasheet 88378. |
| IFSM | 70 A - Non-repetitive forward surge rating (10 ms half-sine); supports inrush current immunity in power-up scenarios. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with 0.300" lead spacing; UL 94 V-0 molded epoxy body. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, cylindrical epoxy body, matte tin-plated leads solderable per J-STD-002. Cathode identified by color band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked lead) | Forward current entry / reverse voltage reference | Connected to lower-potential side (e.g., GND or return path) in uni-directional clamp configuration. |
| Cathode (banded lead) | Avalanche clamping node / high-side connection | Connected to protected line (e.g., 12 V rail or signal trace); conducts when reverse voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables stable avalanche characteristics and long-term reliability under thermal cycling and humidity exposure. |
| 500 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a transients and IEC 61000-4-5 Level 3 surges without degradation. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, infotainment power supplies, and ADAS sensor interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during clamping - critical for protecting 24 V-rated microcontrollers and CAN transceivers. |
| Matte tin-plated leads, JESD 201 Class 1A | Prevents tin whisker growth in high-reliability systems; compatible with wave and reflow soldering up to 275 °C for 10 s. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 12 V supply inputs of BCM microcontrollers against load dump and inductive switching spikes from relays and solenoids. IC Role / Device Role / Timing Role: Uni-directional TVS clamps reverse transients while blocking normal forward bias; responds within <1 ns. Use Value: Limits voltage to ≤29.2 V during 17.1 A surge, preventing latch-up or gate oxide damage in 3.3 V/5 V logic ICs downstream. |
Use Scenario: Shields 24 V digital input channels of programmable logic controllers from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Standoff at 18 V allows safe operation during nominal 24 V ±10 % supply; clamps >30 V transients. Use Value: Maintains signal integrity by limiting transient duration and amplitude - avoids false triggering of optocoupler inputs. |
| DC Power Supply Input Stage | Automotive Sensor Signal Line Protection |
Use Scenario: Installed at AC/DC or DC/DC converter input to absorb line surges and prevent upstream regulator failure. IC Role / Device Role / Timing Role: Primary overvoltage suppression device placed before fuse and common-mode choke. Use Value: Handles 500 W pulses without derating at TA = 25 °C; thermal design accommodates 3.0 W steady-state dissipation. |
Use Scenario: Protects LIN bus or analog sensor outputs (e.g., temperature, pressure) from battery disconnect transients. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) uni-directional clamp minimizes signal distortion on kHz-range signals. Use Value: Clamps 10/1000 μs surges to ≤29.2 V while adding <0.5 pF parasitic capacitance - preserves rise time in 10–100 kbps LIN. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5T | Same VWM (18 V), but SMC (DO-214AB) surface-mount package; 400 W PPPM; higher VC (32.4 V). | Requires PCB redesign for SMD layout; better suited for space-constrained automotive modules. | Select SMAJ18A-E3/5T when board area is constrained and reflow assembly is preferred over through-hole. |
| 1.5KE18A | Same VWM (18 V), but larger DO-201AD package; 1500 W PPPM; higher IPPM (65.2 A); slower response due to higher junction capacitance. | Used where higher surge margin is required (e.g., alternator output lines); not AEC-Q101 qualified. | Choose 1.5KE18A for non-automotive industrial mains-input protection needing >1 kW surge headroom. |
Compared with SMAJ18A-E3/5T and 1.5KE18A, the SA18-E3/54 offers AEC-Q101 qualification, DO-15 through-hole compatibility, and optimal clamping performance (29.2 V) for cost-sensitive 12 V/24 V automotive and industrial control designs - balancing reliability, ease of assembly, and transient suppression efficiency.
Availability
SA18-E3/54 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and DC power supply designs requiring stable component supply, AEC-Q101 compliance, and proven surge immunity in harsh environments.
Supply support for SA18-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, automotive qualification, and high-volume manufacturability.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust, low-clamping overvoltage protection in automotive, industrial, and telecom infrastructure applications where AEC-Q101 compliance and repeatable surge performance are mandatory.
FAQ
What is the clamping voltage of SA18-E3/54 at its rated peak pulse current?
The SA18-E3/54 has a maximum clamping voltage (VC) of 29.2 V at 17.1 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 7 in Vishay datasheet 88378 and defines the upper voltage limit imposed on protected circuitry during surge events. The SA18-E3/54 maintains this clamping performance across its full operating temperature range.
Is SA18-E3/54 qualified for automotive applications?
Yes, SA18-E3/54 is AEC-Q101 qualified, as confirmed in the "Notes" section of Vishay document 88378 (Revision 18-Sep-12). This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making SA18-E3/54 suitable for under-hood and cabin automotive systems. The SA18-E3/54 meets all requirements for use in body control modules and sensor interfaces.
What is the standoff voltage and breakdown range of SA18-E3/54?
The SA18-E3/54 has a reverse stand-off voltage (VWM) of 18 V and a breakdown voltage (VBR) range of 20.0 V to 22.1 V at 10 mA test current. This ensures reliable non-conduction below 18 V and consistent avalanche initiation above 20 V - critical for protecting 12 V and 24 V systems without false triggering. These values are specified in Table 1 of the SA5.0A–SA170CA datasheet.
Does SA18-E3/54 have polarity markings, and how is it installed?
Yes, SA18-E3/54 is a uni-directional TVS diode with a cathode band marking on the banded lead. It must be installed with the banded (cathode) end connected to the line being protected and the unmarked (anode) end tied to ground or the lower-potential reference. Reverse installation prevents clamping action and may cause catastrophic failure during overvoltage events. The SA18-E3/54 polarity is defined in the "Polarity" section of the mechanical data.
What package type and lead finish does SA18-E3/54 use?
SA18-E3/54 uses the DO-204AC (DO-15) axial-leaded package with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The E3 suffix confirms RoHS compliance and JESD 201 Class 1A whisker resistance. Lead spacing is 0.300" (7.6 mm), and the epoxy body meets UL 94 V-0 flammability rating - fully documented in the "Mechanical Data" section of datasheet 88378.
SA18-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SA18-E3/54 FAQ
1.How can I place an order for SA18-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA18-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 SA18-E3/54 reliable?
The price and inventory of SA18-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 SA18-E3/54 is usually 5 days.
3.What payment methods are accepted for SA18-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA18-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA18-E3/54?
SA18-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA18-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 SA18-E3/54?
For technical support, including SA18-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA18-E3/54 requirements.
6.How does Aetrix verify that SA18-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA18-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 SA18-E3/54 meets industry standards.
7.What is the process for return or replacement of SA18-E3/54?
All SA18-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA18-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 SA18-E3/54 part is unused and in its original packaging.
Return procedure for SA18-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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