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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SAC45-E3/54

Name: SAC45-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: SAC45-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SAC45-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: SAC45-E3/54.pdf

Description:: TVS DIODE 45VWM 77VC DO204AC

Quantity:: RFQ Add To RFQ list

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Inventory:4,000

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Product details

Overview

SAC45-E3/54 from Vishay General Semiconductor is a unidirectional low-capacitance TRANSZORB® transient voltage suppressor in DO-15 package, rated for 45 V working inverse voltage (V_WM), 50.0 V minimum breakdown voltage (V_BR), 77.0 V maximum clamping voltage at 6.8 A peak pulse current, and 500 W peak pulse power with 10/1000 µs waveform - used to protect MOSFETs and sensor signal lines against inductive switching transients in industrial control systems.

For engineers reviewing the SAC45-E3/54 datasheet, SAC45-E3/54 pinout, SAC45-E3/54 application, or SAC45-E3/54 equivalent, key selection criteria include clamping performance under 6.8 A surge, unidirectional polarity, DO-15 mechanical compatibility, 175 °C max junction temperature, and compliance with JESD 22-B106 soldering limits.

Technical Context

The SAC45-E3/54 operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response time and low incremental surge resistance. Its 77.0 V clamping voltage at 6.8 A IPPM ensures robust overvoltage protection while maintaining low leakage (5.0 µA at 45 V) and 150 pF junction capacitance at 0 V.

Designed for repetitive transient suppression with 0.01 % duty cycle, it supports operation from –55 °C to +175 °C and dissipates 3.0 W continuously on an infinite heatsink at TL = 75 °C. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	45 V - maximum continuous reverse standoff voltage before conduction begins
V_BR (min)	50.0 V at 1.0 mA - guaranteed avalanche initiation threshold for reliable triggering
V_C (max)	77.0 V at I_PP = 6.8 A - clamped voltage during worst-case 10/1000 µs surge, limiting stress on downstream ICs
P_PPM	500 W - peak pulse power handling capability with standard 10/1000 µs waveform
Junction Capacitance	150 pF at 0 V - low enough for signal-line protection without distorting high-speed interfaces
T_J max	+175 °C - enables use in high-temperature industrial motor drives and power supplies
Polarity	Unidirectional - protects against positive-going transients only; requires external polarity alignment

Pinout & Package

DO-15 (DO-204AC) molded epoxy package with axial leads; cathode denoted by color band; body diameter 0.028–0.034 inch (0.71–0.86 mm), length 0.242–0.258 inch (6.15–6.55 mm).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side reference terminal	Connected to circuit ground or lowest potential node during transient clamp operation
Cathode	High-side transient input terminal	Connected to protected line; color band identifies this end for correct PCB orientation

Key Features

Feature	Design Value
Glass passivated chip junction	Ensures stable avalanche characteristics and long-term reliability under repeated surge stress
500 W peak pulse power (10/1000 µs)	Supports high-energy transient suppression in industrial power electronics without thermal runaway
150 pF junction capacitance	Minimizes signal distortion on data lines up to ~10 MHz while retaining effective ESD/EMI filtering
Matte tin plated leads	Guarantees solder wetting per J-STD-002 and eliminates whisker risk per JESD 201 Class 1A
UL 94 V-0 molding compound	Meets flammability safety requirements for enclosed industrial and telecom equipment

Applications

Industrial Motor Drive Protection	Automotive Sensor Signal Line Protection
Use Scenario: Suppresses voltage spikes induced by relay coil de-energization or IGBT switching in PLC output modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across load terminals to clamp inductive kickback. Use Value: Limits transient voltage to ≤77.0 V, preventing damage to 48 V-rated gate drivers and isolators.	Use Scenario: Shields analog outputs of pressure/temperature sensors connected to 12 V vehicle battery rails. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between sensor output and ground to absorb load-dump-induced surges. Use Value: Withstands 500 W pulses while adding only 150 pF loading, preserving signal integrity in 0–10 kHz sensor bandwidth.
Telecom Power Supply Input Protection	Consumer Appliance Control Board Surge Suppression
Use Scenario: Protects AC-DC converter primary-side rectifier and controller ICs from lightning-induced surges on 48 V telecom power feeds. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor input to clamp line-to-ground transients. Use Value: 45 V V_WM matches nominal 48 V system margin; 175 °C T_J max supports operation near hot power components.	Use Scenario: Guards microcontroller GPIOs and optocoupler inputs against ESD and relay bounce in washing machine control boards. IC Role / Device Role / Timing Role: Low-leakage (5.0 µA) unidirectional suppressor placed on 5 V/3.3 V signal paths. Use Value: 5.0 µA reverse leakage at 45 V prevents measurable current draw in standby mode, extending sleep current budget.

Industrial Motor Drive Protection

Automotive Sensor Signal Line Protection

Use Scenario: Suppresses voltage spikes induced by relay coil de-energization or IGBT switching in PLC output modules.

IC Role / Device Role / Timing Role: Transient voltage suppressor placed across load terminals to clamp inductive kickback.

Use Value: Limits transient voltage to ≤77.0 V, preventing damage to 48 V-rated gate drivers and isolators.

Use Scenario: Shields analog outputs of pressure/temperature sensors connected to 12 V vehicle battery rails.

IC Role / Device Role / Timing Role: Unidirectional TVS mounted between sensor output and ground to absorb load-dump-induced surges.

Use Value: Withstands 500 W pulses while adding only 150 pF loading, preserving signal integrity in 0–10 kHz sensor bandwidth.

Telecom Power Supply Input Protection

Consumer Appliance Control Board Surge Suppression

Use Scenario: Protects AC-DC converter primary-side rectifier and controller ICs from lightning-induced surges on 48 V telecom power feeds.

IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor input to clamp line-to-ground transients.

Use Value: 45 V V_WM matches nominal 48 V system margin; 175 °C T_J max supports operation near hot power components.

Use Scenario: Guards microcontroller GPIOs and optocoupler inputs against ESD and relay bounce in washing machine control boards.

IC Role / Device Role / Timing Role: Low-leakage (5.0 µA) unidirectional suppressor placed on 5 V/3.3 V signal paths.

Use Value: 5.0 µA reverse leakage at 45 V prevents measurable current draw in standby mode, extending sleep current budget.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ45A-E3/57	Same DO-214AC package; 45 V V_WM, 70.1 V V_C at 6.8 A, but 400 W P_PPM	Lower clamping voltage but reduced surge rating; better for space-constrained layouts	Prefer when board area is limited and 400 W surge capacity suffices
P6SMB45AHE3/A	DO-214AA package; 45 V V_WM, 73.0 V V_C at 6.8 A, 600 W P_PPM, higher thermal mass	Higher power rating and improved heat dissipation; requires larger footprint	Choose when sustained surge repetition or elevated ambient temperatures exist

Compared with SMAJ45A-E3/57 and P6SMB45AHE3/A, SAC45-E3/54 offers balanced 500 W surge capability and DO-15 axial lead compatibility for through-hole industrial assemblies, while its 150 pF capacitance provides tighter signal-line fidelity than the SMB variants.

Availability

SAC45-E3/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power supplies, and consumer appliance control boards requiring stable component supply and RoHS-compliant manufacturing.

Supply support for SAC45-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, and protection devices with emphasis on reliability and ruggedness.

The SAC series is engineered specifically for high-energy transient suppression in harsh environments - targeting industrial automation, transportation, and infrastructure where long-term stability under thermal and electrical stress is critical.

FAQ

What is the maximum clamping voltage of the SAC45-E3/54 under standard test conditions?

The SAC45-E3/54 has a maximum clamping voltage (V_C) of 77.0 V when subjected to a 10/1000 µs surge current of 6.8 A. This value is measured per Figure 3 in the official Vishay datasheet (Document Number: 88379) and defines the upper voltage limit imposed on protected circuitry during transient events. Maintaining V_C below downstream component ratings is essential for reliable protection - the SAC45-E3/54 achieves this while delivering 500 W peak pulse power.

Is SAC45-E3/54 suitable for bidirectional signal line protection?

No, SAC45-E3/54 is a unidirectional transient voltage suppressor and must not be used alone for AC or bidirectional signal lines. For such applications, two SAC45-E3/54 devices must be connected in series opposition (anode-to-anode or cathode-to-cathode), as explicitly shown in Figure 4 of the Vishay SAC5.0–SAC50 datasheet. Using a single SAC45-E3/54 on AC signals risks failure during negative transients due to lack of reverse conduction capability.

What is the junction capacitance of SAC45-E3/54 and how does it affect high-frequency signal integrity?

The SAC45-E3/54 exhibits 150 pF junction capacitance at 0 V bias, measured per the electrical characteristics table in the Vishay datasheet. This value introduces minimal loading on low-to-moderate frequency signal paths (e.g., <10 MHz sensor outputs or control lines), preserving rise/fall times and reducing crosstalk risk. However, for RF or high-speed digital traces (>50 MHz), lower-capacitance TVS options like the SMF45 or USB-protected arrays should be considered instead of SAC45-E3/54.

Does SAC45-E3/54 meet RoHS and lead-free assembly requirements?

Yes, SAC45-E3/54 is RoHS-compliant and qualified for lead-free reflow and wave soldering. The "E3" suffix confirms compliance with JEDEC J-STD-002 and JESD 22-B102 solderability standards, and the matte tin-plated leads pass JESD 201 Class 1A whisker testing. It supports solder dip up to 275 °C for 10 seconds per JESD 22-B106, making it compatible with standard commercial and industrial PCB assembly processes.

What is the operating temperature range for SAC45-E3/54 and how does it impact placement near heat sources?

The SAC45-E3/54 operates from –55 °C to +175 °C junction temperature, enabling direct placement near power MOSFETs, transformers, or heatsinks in industrial drives and power supplies. Its 175 °C T_J max exceeds typical ambient limits, allowing design margin even when local board temperatures reach 125 °C. Derating curves in Figure 2 of the Vishay datasheet confirm usable power dissipation down to 50 % at 125 °C case temperature - critical for SAC45-E3/54 reliability in thermally dense layouts.

SAC45-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):: 45V

Voltage - Breakdown (Min):: 50V

Voltage - Clamping (Max) @ Ipp:: 77V

Current - Peak Pulse (10/1000µs):: 6.8A

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)

SAC45-E3/54 FAQ

1.How can I place an order for SAC45-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for SAC45-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 SAC45-E3/54 reliable?

The price and inventory of SAC45-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 SAC45-E3/54 is usually 5 days.

3.What payment methods are accepted for SAC45-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAC45-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SAC45-E3/54?

SAC45-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SAC45-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 SAC45-E3/54?

For technical support, including SAC45-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAC45-E3/54 requirements.

6.How does Aetrix verify that SAC45-E3/54 is sourced from the original manufacturer or authorized distributors?

All SAC45-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 SAC45-E3/54 meets industry standards.

7.What is the process for return or replacement of SAC45-E3/54?

All SAC45-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SAC45-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 SAC45-E3/54 part is unused and in its original packaging.

Return procedure for SAC45-E3/54:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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