My Inquiry
My Account
Taiwan Semiconductor Corporation SMA4S47AH
- Part No.:
- SMA4S47AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S47AH.pdf
- Description:
- TVS DIODE 47VWM 76.3VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:9,979
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA4S47AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in SOD-128 package, with a working stand-off voltage of 47 V, breakdown voltage range 52.5–58.1 V at 1 mA, and clamping voltage of 76.3 V at 5.2 A (10/1000 µs waveform), designed for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4S47AH datasheet, SMA4S47AH pinout, SMA4S47AH application, or SMA4S47AH equivalent, key selection criteria include its AEC-Q101 qualification, ±0.095%/°C VBR temperature coefficient, 175°C maximum junction temperature, and compatibility with high-reliability automotive power rail protection where fast response to transients and stable thermal performance are required.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve robust surge handling and low leakage. Its unidirectional polarity enables integration into DC power rails with defined anode-cathode orientation, and its 20°C/W junction-to-lead thermal resistance supports reliable operation under pulsed power dissipation up to 400 W.
The device complies with JESD201 Class 2 whisker testing and J-STD-020 moisture sensitivity level 1, confirming suitability for standard reflow assembly. Its 16°C/W junction-to-case thermal resistance and UL 94V-0 molding compound support use in thermally constrained PCB layouts with 5 mm × 5 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 47 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 52.5–58.1 V - Voltage at which device enters avalanche breakdown; defines minimum clamping threshold |
| VC @ IPPM=5.2 A | 76.3 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's peak stress level |
| PPPM | 400 W - Peak pulse power handling capability; defines surge energy absorption capacity |
| TJ max | +175°C - Maximum allowable junction temperature; enables operation in under-hood automotive environments |
| RθJL | 20°C/W - Junction-to-lead thermal resistance; informs heatsinking requirements when mounted on PCB |
Pinout & Package
Package: SOD-128 - Surface-mount plastic package with matte tin-plated leads, 0.028 g weight, and cathode band marking for polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side of protected DC rail; must be routed with low-inductance path |
| Cathode | Current exit terminal in forward bias; marked by band | Connected to higher-potential side (e.g., battery positive); defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per AEC standard |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under repeated surge stress |
| VBR tempco ≤ 0.095%/°C | Minimizes variation in breakdown voltage across -55°C to +175°C operating range |
| Moisture sensitivity level 1 | Permits standard SMT reflow without baking or special handling prior to assembly |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally restricted substances |
Applications
| Automotive Power Rail Protection | BLDC Motor Drive Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules against load dump and inductive switching transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across power input to clamp surges above 47 V before they reach downstream regulators and microcontrollers. Use Value: Withstands 400 W pulses and clamps to 76.3 V, preventing damage to 60 V-rated ICs while maintaining AEC-Q101 compliance. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers in three-phase BLDC inverters subject to back-EMF spikes. IC Role / Device Role / Timing Role: Mounted near motor controller ICs to absorb fast-rising (<100 ns) inductive kickback energy from phase switching. Use Value: Low 20°C/W RθJL ensures rapid heat transfer to PCB copper, sustaining repetitive surge immunity without thermal runaway. |
| Battery Management System (BMS) | LED Lighting Driver Protection |
Use Scenario: Overvoltage suppression on cell-balancing circuits and communication lines in 12–48 V modular BMS stacks. IC Role / Device Role / Timing Role: Placed at input of analog front-end ICs to limit transient-induced latch-up or ADC saturation events. Use Value: 1 µA max leakage at 47 V preserves low-power sleep mode integrity; 175°C TJ rating supports operation near hot battery cells. | Use Scenario: Protecting constant-current LED drivers from line transients in commercial streetlight and signage applications. IC Role / Device Role / Timing Role: Connected across driver output to shunt surge energy away from sensitive LED strings and MOSFET switches. Use Value: 76.3 V clamping voltage aligns with 48 V system derating margins; SOD-128 footprint allows compact layout near high-noise switching nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ47A | Lower PPPM (400 W same), but higher VC = 77 V at 5.2 A; non-AEC-Q101 rated | Not qualified for automotive; suitable only for industrial/commercial SMPS | Select SMAJ47A only if AEC-Q101 is not required and board space permits same SOD-128 footprint |
| SMB47A | Same VWM/VBR specs, but lower PPPM = 600 W; SOD-123 package (smaller, higher RθJA) | Higher thermal resistance limits sustained surge duty cycle in high-ambient environments | Choose SMB47A only for space-constrained designs where peak surge energy is lower and ambient temperature remains <105°C |
Compared with SMAJ47A and SMB47A, the SMA4S47AH delivers AEC-Q101 assurance and optimized thermal performance in SOD-128, making it the preferred choice for automotive and high-reliability industrial applications requiring validated surge immunity and stable parametric behavior across temperature.
Availability
SMA4S47AH is available at Aetrix Electronics and suitable for automotive power rail protection, BLDC motor drive circuits, and battery management systems requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMA4S47AH 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 industrial and automotive markets.
The SMA4SxxAH series was developed specifically for AEC-Q101-compliant transient suppression in 12–60 V automotive subsystems, emphasizing thermal robustness, low leakage, and consistent clamping performance under real-world surge conditions.
FAQ
What is the maximum clamping voltage of the SMA4S47AH under a 10/1000 µs surge?
The SMA4S47AH has a maximum clamping voltage (VC) of 76.3 V when subjected to a 5.2 A peak pulse current with a 10/1000 µs waveform. This value is measured per the device's electrical specifications table and defines the upper voltage limit imposed on protected circuitry during transient events. The SMA4S47AH maintains this clamping performance across its specified operating temperature range and is validated for repeatable behavior in automotive-grade applications.
Is the SMA4S47AH suitable for bidirectional signal line protection?
No, the SMA4S47AH is a unidirectional TVS diode, intended only for DC power rail protection where polarity is fixed. It does not provide symmetrical clamping for AC or bidirectional data lines. For such applications, a bidirectional variant like SMA4S47AY (if available) or a dedicated bidirectional TVS array would be required. The SMA4S47AH's cathode band marking and single-polarity breakdown behavior confirm its unidirectional design.
What is the thermal resistance from junction to ambient for the SMA4S47AH?
The SMA4S47AH has a junction-to-ambient thermal resistance (RθJA) of 62°C/W when mounted on a standard 5 mm × 5 mm copper pad test board. This value assumes no external heatsink and reflects typical PCB-level thermal performance. Designers should use this parameter to estimate steady-state junction temperature rise under continuous power dissipation, though the device is primarily rated for transient (not continuous) power handling.
Does the SMA4S47AH require special handling during PCB assembly?
No - the SMA4S47AH is rated at moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and processed using standard lead-free reflow profiles without pre-baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the SOD-128 package is compatible with automated pick-and-place and reflow equipment used in high-volume manufacturing.
How does the SMA4S47AH's VBR temperature coefficient affect system design?
The SMA4S47AH has a maximum VBR temperature coefficient of 0.095%/°C, meaning its breakdown voltage increases predictably with junction temperature. This allows designers to accurately model worst-case clamping behavior across the full -55°C to +175°C operating range. For example, at 150°C, VBR may increase ~11.9% over room-temperature value - a factor critical for margining protection thresholds in under-hood automotive electronics using the SMA4S47AH.
SMA4S47AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-128
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 47V
- Voltage - Breakdown (Min):
- 52.5V
- Voltage - Clamping (Max) @ Ipp:
- 76.3V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-128
SMA4S47AH FAQ
1.How can I place an order for SMA4S47AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S47AH 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 SMA4S47AH reliable?
The price and inventory of SMA4S47AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S47AH is usually 5 days.
3.What payment methods are accepted for SMA4S47AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S47AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S47AH?
SMA4S47AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S47AH 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 SMA4S47AH?
For technical support, including SMA4S47AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S47AH requirements.
6.How does Aetrix verify that SMA4S47AH is sourced from the original manufacturer or authorized distributors?
All SMA4S47AH 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 SMA4S47AH meets industry standards.
7.What is the process for return or replacement of SMA4S47AH?
All SMA4S47AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S47AH, 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 SMA4S47AH part is unused and in its original packaging.
Return procedure for SMA4S47AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA4S47AH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
