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

Vishay General Semiconductor - Diodes Division SA28CAHE3/54

Name: SA28CAHE3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA28CAHE3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA28CAHE3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: SA28CAHE3/54.pdf

Description:: TVS DIODE 28VWM 45.4VC DO204AC

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Product details

Overview

SA28CAHE3/54 from Vishay General Semiconductor is a bidirectional TransZORB® transient voltage suppressor diode in DO-15 package, rated for 28 V stand-off voltage (V_WM), 31.1–34.4 V breakdown voltage (V_BR), 500 W peak pulse power (10/1000 μs), 11 A peak pulse current (I_PPM), and 45.4 V clamping voltage (V_C). It protects signal lines and power rails in automotive sensor interfaces against ESD and inductive switching transients.

For engineers reviewing the SA28CAHE3/54 datasheet, SA28CAHE3/54 pinout, SA28CAHE3/54 application, or SA28CAHE3/54 equivalent, this AEC-Q101 qualified TVS diode delivers verified bidirectional clamping, low incremental surge resistance, fast response time, and RoHS-compliant matte tin-plated leads suitable for reflow and wave soldering per J-STD-002.

Technical Context

The SA28CAHE3/54 operates as a bidirectional avalanche diode with symmetrical breakdown behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable V_BR tolerance (±5 %) and low leakage (<1.0 μA at 28 V).

Designed for repetitive transient suppression under 0.01 % duty cycle, it sustains 500 W peak pulse power with 10/1000 μs waveform and derates linearly above 25 °C ambient, maintaining reliable operation up to T_J = 175 °C. The device exhibits 31 mV/°C temperature coefficient of V_BR, supporting predictable clamping across automotive temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin in protected circuit.
V_BR (min/max)	31.1 V / 34.4 V at 1.0 mA - Confirmed avalanche onset range; ensures consistent turn-on across production lots and temperature.
V_C @ I_PPM	45.4 V at 11 A - Clamped voltage during 10/1000 μs transient; determines maximum stress on downstream ICs.
P_PPM	500 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 surge immunity design.
I_PPM	11 A - Maximum non-repetitive surge current; sets minimum trace width and fuse coordination requirements.
T_J max.	175 °C - Junction temperature limit; enables placement near heat sources in engine control units and ADAS modules.
AEC-Q101	Qualified - Validated for automotive electronics per stress test conditions including HTOL, TC, UHAST; required for under-hood applications.

Pinout & Package

Package: DO-15 (DO-204AC), axial-leaded, molded epoxy case meeting UL 94 V-0; no polarity marking (bidirectional configuration).

Pin/Terminal	Circuit Role	Design Meaning
Anode / Cathode (symmetrical)	Bidirectional avalanche junction	No functional distinction between leads; either terminal serves as input/output for transient energy dissipation in both directions.
Lead 1	Matte tin-plated copper alloy	Solderable per J-STD-002; withstands 275 °C dip for 10 s; meets JESD 201 Class 2 whisker resistance.
Lead 2	Matte tin-plated copper alloy	Identical to Lead 1; enables automated placement and dual-side PCB routing without orientation constraints.

Key Features

Feature	Design Value
Glass-passivated chip junction	Ensures stable V_BR tolerance (±5 %), low leakage (<1 μA), and long-term reliability under thermal cycling.
500 W peak pulse power (10/1000 μs)	Supports IEC 61000-4-5 surge testing up to 4 kV open-circuit voltage in industrial and automotive environments.
AEC-Q101 qualification	Validates suitability for automotive powertrain, body electronics, and ADAS systems requiring extended lifetime and high-temperature operation.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving system-level EMI resilience.
RoHS-compliant HE3 suffix	Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance-critical for high-reliability automotive supply chains.

Applications

Automotive Sensor Protection	Industrial CAN Bus Interface
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Limits voltage excursion to ≤45.4 V during 11 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and transceivers.	Use Scenario: Safeguarding RS-485/CAN FD physical layer nodes in factory automation PLCs exposed to motor drive noise and relay switching. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) bidirectional TVS placed across differential pair to clamp common-mode transients without distorting signal integrity. Use Value: Maintains <1.0 μA leakage at 28 V, avoiding bias current errors in precision current-loop receivers while surviving repetitive 500 W pulses.
Consumer Power Adapter Input	Telecom Line Card Surge Protection
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices subjected to lightning-induced surges on DC output lines. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between +VOUT and GND to clamp flyback transformer ringing and external surge coupling. Use Value: 28 V V_WM allows compatibility with 24 V nominal outputs; 45.4 V V_C ensures downstream DC-DC converters remain within absolute maximum ratings.	Use Scenario: Primary protection stage on telecom line cards handling POTS or xDSL signals, where bidirectional clamping prevents polarity-dependent failure modes. IC Role / Device Role / Timing Role: First-line defense mounted at RJ-11/RJ-45 jack to absorb induced surges before reaching hybrid transformers and SLIC circuits. Use Value: Symmetrical V_BR (31.1–34.4 V) guarantees identical clamping in tip/ring directions, eliminating need for dual unidirectional devices and reducing BOM count.

Automotive Sensor Protection

Industrial CAN Bus Interface

Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in vehicle ECUs.

IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching PHY layer.

Use Value: Limits voltage excursion to ≤45.4 V during 11 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and transceivers.

Use Scenario: Safeguarding RS-485/CAN FD physical layer nodes in factory automation PLCs exposed to motor drive noise and relay switching.

IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) bidirectional TVS placed across differential pair to clamp common-mode transients without distorting signal integrity.

Use Value: Maintains <1.0 μA leakage at 28 V, avoiding bias current errors in precision current-loop receivers while surviving repetitive 500 W pulses.

Consumer Power Adapter Input

Telecom Line Card Surge Protection

Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices subjected to lightning-induced surges on DC output lines.

IC Role / Device Role / Timing Role: Standoff-rated TVS connected between +VOUT and GND to clamp flyback transformer ringing and external surge coupling.

Use Value: 28 V V_WM allows compatibility with 24 V nominal outputs; 45.4 V V_C ensures downstream DC-DC converters remain within absolute maximum ratings.

Use Scenario: Primary protection stage on telecom line cards handling POTS or xDSL signals, where bidirectional clamping prevents polarity-dependent failure modes.

IC Role / Device Role / Timing Role: First-line defense mounted at RJ-11/RJ-45 jack to absorb induced surges before reaching hybrid transformers and SLIC circuits.

Use Value: Symmetrical V_BR (31.1–34.4 V) guarantees identical clamping in tip/ring directions, eliminating need for dual unidirectional devices and reducing BOM count.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ28CA	Same V_WM (28 V), higher P_PPM (600 W), SMC package (surface-mount), lower V_C (45.4 V same), 12.5 A I_PPM.	Requires PCB redesign for SMD footprint; better suited for space-constrained designs with higher surge margin.	Select SMBJ28CA when board area is limited and 600 W rating is needed; SA28CAHE3/54 remains optimal for through-hole legacy or high-vibration mounting.
1.5KE28CA	Same V_WM (28 V), higher P_PPM (1500 W), DO-201 package (larger axial), V_C = 43.4 V, I_PPM = 34.7 A.	Larger mechanical footprint and higher clamping energy; used in mains-input or high-energy industrial surge stages.	Choose 1.5KE28CA for primary AC-line protection where energy absorption dominates; SA28CAHE3/54 targets secondary-side, low-leakage, AEC-Q101–required locations.

Compared with SMBJ28CA and 1.5KE28CA, the SA28CAHE3/54 offers AEC-Q101 qualification and DO-15 form factor ideal for automotive through-hole assembly, while delivering precise 28 V standoff and verified 45.4 V clamping-making it the preferred choice for cost-sensitive, vibration-resistant, and qualification-mandated applications.

Availability

SA28CAHE3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer power adapter outputs, and telecom line card protection requiring stable component supply and full AEC-Q101 traceability.

Supply support for SA28CAHE3/54 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 TVS devices with emphasis on reliability, efficiency, and qualification for harsh environments.

The SAxxCA series is designed specifically for bidirectional transient suppression in automotive, industrial, and telecom systems-delivering AEC-Q101 compliance, precise V_WM/V_C matching, and robust surge handling in standardized DO-15 packaging.

FAQ

What is the clamping voltage of the SA28CAHE3/54 under a 10/1000 μs surge?

The SA28CAHE3/54 has a maximum clamping voltage (V_C) of 45.4 V at 11 A peak pulse current (I_PPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number 88378) and defines the upper voltage limit imposed on protected circuitry during transient events. The SA28CAHE3/54 maintains this clamping performance across its qualified operating temperature range.

Is the SA28CAHE3/54 suitable for automotive applications?

Yes, the SA28CAHE3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and body electronics. Its DO-15 package, glass-passivated junction, 175 °C maximum junction temperature, and JESD 201 Class 2 whisker resistance meet stringent automotive reliability requirements. The SA28CAHE3/54 is commonly deployed in ECU sensor protection and infotainment interface circuits.

How does the bidirectional nature of the SA28CAHE3/54 affect its circuit placement?

The SA28CAHE3/54 has no polarity marking and functions identically in both directions, allowing placement across any two nodes requiring symmetrical overvoltage protection-such as differential signal pairs, AC-coupled lines, or floating power domains. Unlike unidirectional TVS diodes, the SA28CAHE3/54 eliminates orientation sensitivity during assembly and avoids reverse-bias failure modes in bipolar signal environments.

What is the maximum steady-state power dissipation of the SA28CAHE3/54?

The SA28CAHE3/54 has a maximum steady-state power dissipation (P_D) of 3.0 W when mounted on an infinite heatsink at lead temperature (T_L) = 75 °C. This rating applies to continuous DC or low-frequency reverse leakage conditions-not transient events. Derating is required above 25 °C ambient, per Figure 5 in the Vishay datasheet (88378), ensuring safe thermal operation in enclosed enclosures or high-temperature environments.

Does the SA28CAHE3/54 have RoHS and lead-free compliance?

Yes, the SA28CAHE3/54 carries the HE3 suffix, indicating RoHS-compliant construction and AEC-Q101 qualification. Its matte tin-plated leads meet J-STD-002 solderability standards and JESD 201 Class 2 whisker resistance requirements. The molding compound complies with UL 94 V-0 flammability rating, and the entire device is manufactured without lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE per EU RoHS Directive 2011/65/EU.

SA28CAHE3/54 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:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 28V

Voltage - Breakdown (Min):: 31.1V

Voltage - Clamping (Max) @ Ipp:: 45.4V

Current - Peak Pulse (10/1000µs):: 11A

Power - Peak Pulse:: 500W

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

SA28CAHE3/54 FAQ

1.How can I place an order for SA28CAHE3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA28CAHE3/54 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 SA28CAHE3/54 reliable?

The price and inventory of SA28CAHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28CAHE3/54 is usually 5 days.

3.What payment methods are accepted for SA28CAHE3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28CAHE3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA28CAHE3/54?

SA28CAHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA28CAHE3/54 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 SA28CAHE3/54?

For technical support, including SA28CAHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28CAHE3/54 requirements.

6.How does Aetrix verify that SA28CAHE3/54 is sourced from the original manufacturer or authorized distributors?

All SA28CAHE3/54 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 SA28CAHE3/54 meets industry standards.

7.What is the process for return or replacement of SA28CAHE3/54?

All SA28CAHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA28CAHE3/54, 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 SA28CAHE3/54 part is unused and in its original packaging.

Return procedure for SA28CAHE3/54:

1.Submit a request within 90 days.

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

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