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Taiwan Semiconductor Corporation SA54CAH
- Part No.:
- SA54CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA54CAH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,737
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Product details
Overview
SA54CAH from Taiwan Semiconductor is a bidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive-grade ESD and 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 IPPM, and operating junction temperature up to +175 °C.
For engineers reviewing the SA54CAH datasheet, SA54CAH pinout, SA54CAH application, or SA54CAH equivalent, this device serves as a high-reliability, bidirectional surge protector for automotive power rails, CAN bus interfaces, and sensor signal lines where fast response (<5 ns), low leakage (<1 µA @ 54 V), and AEC-Q101 qualification are mandatory.
Technical Context
The SA54CAH is a silicon avalanche diode configured for bidirectional clamping - symmetric VBR and VC characteristics apply in both polarities. Its 500 W surge rating per 10/1000 µs waveform is achieved with low dynamic impedance and sub-5 ns response time, enabling effective suppression of EFT, lightning-induced transients, and load-dump spikes.
Designed for automotive environments, it meets AEC-Q101 stress requirements including temperature cycling, HTRB, and mechanical robustness. The DO-204AC package supports lead-free soldering (J-STD-002), UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance - critical for under-hood and body-control module deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse voltage before clamping begins; defines safe operating margin for 48 V automotive systems. |
| VBR min/max | 60.0 / 73.3 V @ 1 mA - tight breakdown tolerance ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 86.3 V @ 5.4 A - clamping voltage limits downstream IC stress during 500 W surge; <32.3 V overhead above VWM. |
| PPK | 500 W - peak pulse power handling per 10/1000 µs waveform; validated for ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-4 EFT. |
| IR @ VWM | <1 µA - ultra-low leakage preserves battery drain budget in always-on vehicle modules (e.g., telematics, gateway ECUs). |
| TJ max | +175 °C - enables placement near high-temperature zones (engine control units, ADAS power supplies) without derating. |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with tin-plated leads; compatible with automated through-hole assembly and reflow-solderable per J-STD-002. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking for unidirectional variants; SA54CAH is bidirectional and has no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal accepts positive or negative transients; no orientation required during PCB placement. |
| Lead 1 / Lead 2 | Surge current path | Carries full 5.4 A peak pulse current during clamping; leads rated for 70 A IFSM (8.3 ms half-sine). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use: temperature cycling (-55 °C to +175 °C), HTRB, and mechanical shock per AEC standard. |
| Bidirectional clamping | Identical VBR (60–73.3 V) and VC (86.3 V) in both directions - protects AC-coupled signals (e.g., CAN_H/CAN_L) without external polarity management. |
| 5 ns response time | Clamps transients within 5 nanoseconds from zero volts to VBR - faster than most microcontroller GPIO protection thresholds. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for global automotive OEM supply chains. |
| UL 94V-0 molding | Flame-retardant epoxy housing prevents propagation of fire in high-energy fault conditions (e.g., short-circuit + surge). |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs (e.g., ADAS cameras, domain controllers) against load dump (ISO 7637-2 Pulse 5a) and alternator switching surges. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry point, shunting >95% of surge energy before reaching DC-DC converters or MCU power pins. Use Value: Limits rail voltage to ≤86.3 V during 500 W transients, preventing latch-up or permanent damage to 50 V-rated input stages. |
Use Scenario: Shielding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD230) from ESD (IEC 61000-4-2 ±25 kV) and EFT (IEC 61000-4-4 ±4 kV). IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H–CAN_L differential pair, absorbing common-mode and differential transients without distorting signal integrity. Use Value: Clamps differential spikes to <172.6 V (2 × VC) while maintaining <1 pF junction capacitance - no data rate degradation at 5 Mbps. |
| Sensor Signal Line Protection | Body Control Module I/O Protection |
|
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in HVAC or lighting modules exposed to wiring harness coupling and relay switching noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed directly at connector interface, limiting transient amplitude before RC filtering network. Use Value: Prevents ADC saturation and offset drift by clamping transients to ≤86.3 V while adding negligible error (<0.01% FS) due to sub-µA IR. |
Use Scenario: Hardening LIN bus, switch inputs, and LED driver outputs in door modules and seat controllers against cable discharge events and inductive kickback. IC Role / Device Role / Timing Role: Robust, cost-effective discrete protector replacing multi-layer varistors or integrated protection ICs in high-volume body electronics. Use Value: Delivers 500 W surge immunity in compact DO-15 footprint - reduces BOM count vs. dual-unidirectional solutions and avoids layout asymmetry issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ54CA | Same DO-214AC package (SMA), 54 V VWM, 60–73.3 V VBR, but 400 W PPK (10/1000 µs) and higher VC (93.6 V @ 4.3 A). | Lower surge rating and higher clamping reduce margin in high-energy automotive pulses (e.g., ISO 7637-2 Pulse 5a). | Acceptable for non-critical 12 V/24 V systems where 500 W headroom is not mandated. |
| ON Semiconductor 1.5KE54CA | DO-201AD package, same 54 V VWM and bidirectional function, but 1500 W PPK (10/1000 µs) and larger footprint (7.1 × 4.5 mm vs. DO-15's 4.2 × 2.2 mm). | Higher surge capacity suits industrial motor drives, but oversized for space-constrained automotive PCBs. | Preferred when system-level surge testing exceeds 500 W or when legacy 1.5KE footprint compatibility is required. |
Compared with SMAJ54CA and 1.5KE54CA, the SA54CAH uniquely balances AEC-Q101 qualification, 500 W capability, DO-15 compactness, and sub-µA leakage - making it optimal for next-gen automotive ECUs where size, reliability, and efficiency are co-constrained.
Availability
SA54CAH is available at Aetrix Electronics and suitable for automotive electronic control units, CAN/LIN bus interfaces, and sensor signal conditioning circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for SA54CAH 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 for automotive, industrial, and consumer markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in automotive power and communication networks - emphasizing robustness, consistency, and manufacturability in high-volume automotive assembly.
FAQ
What does the "H" suffix in SA54CAH signify?
The "H" suffix in SA54CAH indicates full AEC-Q101 qualification - verified through temperature cycling, highly accelerated life testing (HALT), and mechanical stress validation per automotive reliability standards. This distinguishes SA54CAH from non-H variants like SA54CA, which lack formal automotive qualification despite identical electrical specs.
Is SA54CAH unidirectional or bidirectional, and how is polarity identified?
SA54CAH is a bidirectional TVS diode - its breakdown and clamping behavior is identical in both polarities, with no cathode band or polarity marking on the DO-204AC package. This eliminates orientation concerns during placement and makes it ideal for protecting differential buses like CAN or LIN where voltage reversals occur naturally.
What is the maximum clamping voltage of SA54CAH under a 500 W surge?
The maximum clamping voltage of SA54CAH is 86.3 V at 5.4 A peak pulse current (IPPM), corresponding to the standardized 10/1000 µs surge waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 86.3 V during worst-case 500 W transients.
Can SA54CAH replace SA54A in an existing design?
SA54CAH can replace SA54A only if AEC-Q101 qualification is required and board layout accommodates identical DO-204AC (DO-15) footprint. Electrically, both share VWM = 54 V and VBR = 60–73.3 V, but SA54CAH adds automotive qualification, tighter process controls, and extended temperature validation - no circuit redesign is needed.
Does SA54CAH meet RoHS and halogen-free requirements?
Yes, SA54CAH complies with EU RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and the pure tin-plated leads meet J-STD-002 solderability requirements - fulfilling Tier-1 automotive supplier environmental mandates.
SA54CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA54CAH FAQ
1.How can I place an order for SA54CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA54CAH 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 SA54CAH reliable?
The price and inventory of SA54CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA54CAH is usually 5 days.
3.What payment methods are accepted for SA54CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA54CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA54CAH?
SA54CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA54CAH 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 SA54CAH?
For technical support, including SA54CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA54CAH requirements.
6.How does Aetrix verify that SA54CAH is sourced from the original manufacturer or authorized distributors?
All SA54CAH 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 SA54CAH meets industry standards.
7.What is the process for return or replacement of SA54CAH?
All SA54CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA54CAH, 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 SA54CAH part is unused and in its original packaging.
Return procedure for SA54CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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