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Taiwan Semiconductor Corporation SA54AH
- Part No.:
- SA54AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA54AH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,990
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Product details
Overview
SA54AH from Taiwan Semiconductor is a unidirectional AEC-Q101 qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive-grade surge protection. It features a 54 V working stand-off voltage (VWM), 60–73.3 V breakdown voltage (VBR @ 1 mA), 500 W peak pulse power (10/1000 µs), clamping voltage of 86.3 V at 5.4 A, and operating junction temperature up to +175 °C.
For engineers reviewing the SA54AH datasheet, SA54AH pinout, SA54AH application, or SA54AH equivalent, this device is selected for high-reliability DC power rail protection in automotive ECUs, industrial control I/O modules, and 24 V/48 V system interfaces where fast clamping (<1 ps response), low leakage (<1 µA @ 54 V), and AEC-Q101 qualification are mandatory.
Technical Context
The SA54AH operates as a unidirectional avalanche diode with precise breakdown triggered at ≥60 V under 1 mA test current, maintaining stable clamping at 86.3 V during 5.4 A 10/1000 µs transients. Its low dynamic impedance ensures minimal voltage overshoot during ESD and load-dump events.
Designed for automotive environments, it meets AEC-Q101 stress requirements including temperature cycling, humidity bias, and mechanical shock. The DO-204AC package supports lead-free reflow soldering per J-STD-002 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V automotive systems. |
| VBR min / max | 60.0 / 73.3 V @ 1 mA - Tight breakdown window ensures predictable turn-on without premature leakage or delayed clamping. |
| VC @ IPPM | 86.3 V @ 5.4 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <87 V under worst-case 500 W transient. |
| PPK | 500 W - Peak pulse power rating per 10/1000 µs waveform; validated for ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss and avoids false triggering in low-power sensor circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., power MOSFETs, DC-DC inductors) in engine bay applications. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400 g mass, UL 94V-0 molding compound, and pure tin-plated leads. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, epoxy-molded, cathode band marked on one end. Leads are pure tin-plated, solderable per J-STD-002. Polarity is unidirectional; cathode band denotes the cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference node | Connected to system ground or low-side return path; carries full surge current during clamping. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 48 V supply rail); voltage at this node is clamped to ≤86.3 V during transients. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature cycling, HAST, and mechanical shock - required for ECU, ADAS, and body control module deployment. |
| Sub-1 ps response time | Enables effective suppression of nanosecond-scale ESD events (IEC 61000-4-2 ±8 kV contact) before sensitive logic is damaged. |
| 500 W 10/1000 µs rating | Meets ISO 7637-2 Pulse 5a (load dump) energy requirements for 12 V/24 V/48 V vehicle electrical systems. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life recycling mandates. |
| Low IR & tight VBR tolerance | <1 µA leakage at 54 V and ±10% VBR spread ensure stable operation in battery-backed or always-on circuits without drift or false triggers. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 48 V DC Power Distribution |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load-dump transients during alternator regulation failure. IC Role / Device Role: Unidirectional TVS placed between 48 V supply and ground, upstream of DC-DC converter input. Use Value: Clamps 120 V/100 ms load dump to ≤86.3 V, preventing overvoltage damage to downstream 50 V-rated regulators and logic. |
Use Scenario: Shields programmable logic controller (PLC) digital input modules from inductive kickback when switching solenoids or relays. IC Role / Device Role: Standoff protection on 48 V field power bus feeding opto-isolated inputs. Use Value: Limits transient overshoot to <87 V during 500 W surges, preserving isolation barrier integrity and input comparator thresholds. |
| Telecom Remote Radio Unit (RRU) | EV Onboard Charger (OBC) Auxiliary Supply |
Use Scenario: Guards Ethernet PHY power pins against lightning-induced surges entering via outdoor fiber-to-copper interfaces. IC Role / Device Role: Primary-level TVS on 48 V PoE-derived bias rail, coordinated with secondary GDT/gas tube stages. Use Value: Sub-1 ps response captures fast-rising edges before secondary protectors activate, reducing let-through energy by >40%. |
Use Scenario: Safeguards 12 V auxiliary supply (derived from HV battery) against coupling noise from bidirectional DC-DC converters. IC Role / Device Role: Unidirectional clamp on isolated 12 V output rail feeding MCU, gate drivers, and sensors. Use Value: Withstands repeated 500 W transients while maintaining <1 µA leakage, ensuring no impact on sleep-mode 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 |
|---|---|---|---|
| SMAJ54A | Same 54 V VWM, but lower PPK (400 W), higher VC (93.6 V @ 4.3 A), and no AEC-Q101 qualification. | Suitable for commercial-grade 48 V systems only; not approved for automotive under-hood use. | Select SMAJ54A only if AEC-Q101 compliance is unnecessary and cost is prioritized over surge margin. |
| 1.5KE54A | Higher VBR spread (60–73.3 V vs. 64–77 V), same DO-204AC package, but rated for 1500 W (10/1000 µs) and lacks AEC-Q101 validation. | Used in legacy industrial power supplies; larger thermal mass but no automotive reliability documentation. | Choose 1.5KE54A only when higher peak power is needed and automotive qualification is not required. |
Compared with SMAJ54A and 1.5KE54A, the SA54AH delivers guaranteed AEC-Q101 qualification, tighter VBR tolerance, and optimized clamping (86.3 V) for modern 48 V automotive architectures - making it the preferred choice where functional safety and long-term reliability are non-negotiable.
Availability
SA54AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial 48 V power distribution, and EV onboard charger auxiliary supply applications requiring stable component supply, long-lifecycle support, and traceable AEC-Q101 qualified parts.
Supply support for SA54AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 certified production lines.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing robustness under load-dump, ESD, and EFT stress - with SA54AH targeting 48 V system protection where high-temperature operation and qualification rigor are critical.
FAQ
What is the AEC-Q101 qualification status of the SA54AH?
The SA54AH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirmed in the SA Series datasheet Version L2105. This includes full stress testing for temperature cycling, high-temperature operating life, unbiased highly accelerated stress test (uHAST), and mechanical shock - validating its suitability for automotive under-hood and chassis applications.
Does the SA54AH have bidirectional capability?
No, the SA54AH is a unidirectional TVS diode. Its marking includes a cathode band, and all electrical parameters (VBR, VC, IR) are specified for reverse-biased operation only. For bidirectional protection, the SA54A variant (with "A" suffix) must be used - it has symmetrical breakdown in both directions and no polarity marking.
What is the maximum clamping voltage of the SA54AH under standard test conditions?
The SA54AH has a maximum clamping voltage (VC) of 86.3 V at 5.4 A peak pulse current (IPPM), measured using the 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during a 500 W transient.
Can the SA54AH be used in surface-mount designs?
No, the SA54AH is packaged exclusively in the axial-leaded DO-204AC (DO-15) case and is intended for through-hole mounting. It does not have an SMD variant. For surface-mount equivalents with similar ratings, consider the SMAJ54A (SMA package) or SMCJ54A (SMC package), though neither carries AEC-Q101 qualification.
How does the SA54AH compare to the SA54A in terms of leakage current?
The SA54AH specifies reverse leakage current (IR) of <1 µA at 54 V, while the SA54A (bidirectional version) specifies <1 µA at 54 V in either direction. Both meet the same low-leakage threshold, but the SA54AH's unidirectional structure provides slightly better forward conduction characteristics - relevant for applications where forward voltage drop during fault conditions matters.
SA54AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 6A
- 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)
SA54AH FAQ
1.How can I place an order for SA54AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA54AH 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 SA54AH reliable?
The price and inventory of SA54AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA54AH is usually 5 days.
3.What payment methods are accepted for SA54AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA54AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA54AH?
SA54AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA54AH 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 SA54AH?
For technical support, including SA54AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA54AH requirements.
6.How does Aetrix verify that SA54AH is sourced from the original manufacturer or authorized distributors?
All SA54AH 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 SA54AH meets industry standards.
7.What is the process for return or replacement of SA54AH?
All SA54AH units undergo pre-shipment inspection (PSI). If there is an issue with SA54AH, 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 SA54AH part is unused and in its original packaging.
Return procedure for SA54AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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