My Inquiry
My Account
Taiwan Semiconductor Corporation SA43AH
- Part No.:
- SA43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,024
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA43AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 43V working stand-off voltage (VWM), 47.8–58.4V breakdown voltage (VBR), and 76.7V maximum clamping voltage (VC) at 6.8A peak pulse current - deployed for automotive ESD and load-dump protection in engine control units.
For engineers reviewing the SA43AH datasheet, SA43AH pinout, SA43AH application, or SA43AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000μs surge, thermal derating behavior, and direct alternatives for automotive-grade TVS selection.
Technical Context
The SA43AH operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its VBR range (47.8–58.4V at 1mA test current), clamping transients to ≤76.7V at 6.8A. Its low leakage (<1μA at 43V) ensures minimal standby power loss in always-on automotive circuits.
Designed for non-repetitive surge suppression per IEC 61000-4-5 and ISO 7637-2, it sustains 175°C junction temperature and exhibits 55 mV/°C VBR temperature coefficient - enabling stable overvoltage protection across extended automotive ambient ranges (-40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe system bus voltage margin. |
| VBR min/max | 47.8 / 58.4 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above nominal 43V rail. |
| VC @ IPPM | 76.7 V at 6.8 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to sub-80V level. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; meets ISO 7637-2 Pulse 5a load-dump immunity. |
| TJ max | 175 °C - Maximum junction temperature; supports under-hood placement without thermal derating penalties. |
| IR @ VWM | <1 μA - Reverse leakage at 43V; negligible current draw in battery-sensitive always-on modules. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package; compatible with legacy through-hole PCB assembly. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals support unidirectional transient shunting from protected line to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground plane; completes clamping path during overvoltage events. |
| Cathode | Protected line input | Connected to supply rail or signal line requiring protection; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a load-dump surges up to 500W without degradation or parametric shift. |
| Fast response time <1.0 ps | Sub-picosecond avalanche initiation enables protection of high-speed CAN/LIN transceivers against ESD-induced latch-up. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for automotive OEM production with strict material restrictions. |
| Low clamping ratio VC/VBR | Clamping ratio ≤1.61 (76.7V/47.8V) ensures tight voltage limiting - critical for 48V mild-hybrid system compatibility. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Lighting Driver Protection |
|---|---|
Use Scenario: Protects 12V/42V power inputs of engine control units against ISO 7637-2 load-dump transients up to 120V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps overvoltage spikes before they reach DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 76.7V at 6.8A, preventing damage to 80V-rated input stages in automotive PMICs. | Use Scenario: Shields LED driver ICs in headlamp modules from inductive switching transients generated by relay or MOSFET turn-off. IC Role / Device Role / Timing Role: Fast-response TVS absorbs energy from L×di/dt spikes on 12V supply rails feeding constant-current LED drivers. Use Value: Sub-1ps response ensures clamping initiates before driver IC internal protection triggers, avoiding false shutdowns. |
| Body Control Module (BCM) LIN Bus Protection | Start-Stop System Battery Monitoring Circuit |
Use Scenario: Safeguards LIN transceivers connected to vehicle chassis wiring against ESD and coupled fast transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN bus line and ground, referenced to local ground plane. Use Value: Low 1μA leakage at 43V prevents signal distortion on LIN's 12V nominal bus while maintaining noise immunity. | Use Scenario: Protects precision voltage dividers and ADC inputs monitoring 12V/48V battery voltage in start-stop systems. IC Role / Device Role / Timing Role: Standoff-rated TVS shunts surges before they saturate op-amp front-ends or damage SAR ADC reference nodes. Use Value: Tight VWM/VBR margin (43V/47.8V) avoids false triggering during cranking dips while ensuring robust surge response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Same DO-214AC package; 43V VWM but bidirectional configuration; higher IR (5μA @ 43V) | Requires redesign for bidirectional signal lines; unsuitable for unidirectional power rail protection without polarity check | Select SMAJ43A only if protecting AC-coupled or differential buses like CAN FD where bidirectional clamping is required |
| P6SMB43AH | DO-214AA package; identical 43V VWM and AEC-Q101 qualification; slightly higher VC (77.0V @ 6.8A) | Same footprint compatibility not guaranteed due to DO-214AA vs DO-204AC lead spacing and body dimensions | Prefer P6SMB43AH for SMT-based automotive modules where board space constraints favor surface-mount over axial leads |
Compared with SMAJ43A and P6SMB43AH, the SA43AH offers unidirectional operation in axial DO-204AC packaging with lowest clamping voltage (76.7V) and tightest VBR tolerance - making it optimal for cost-sensitive, through-hole automotive power rail protection where polarity is fixed and lead-forming flexibility is needed.
Availability
SA43AH is available at Aetrix Electronics and suitable for automotive ECU power inputs, lighting driver protection, body control module (BCM) interfaces, and start-stop battery monitoring circuits requiring stable component supply with AEC-Q101 compliance and long-term automotive lifecycle support.
Supply support for SA43AH 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 automotive-qualified components since 1979.
The SA Series is designed specifically for automotive-grade transient suppression - delivering AEC-Q101-qualified, high-power TVS diodes with optimized clamping performance and thermal stability for 12V/48V vehicle electrical systems.
FAQ
What is the AEC-Q101 qualification status of the SA43AH?
The SA43AH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirmed in the SA Series datasheet Version L2105. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating its suitability for under-hood automotive applications such as engine control units and body electronics modules where SA43AH is deployed for load-dump and ESD protection.
Does the SA43AH support bidirectional transient suppression?
No, the SA43AH is a unidirectional TVS diode, as indicated by its single cathode band marking and specification table entries limited to VBR (uni-directional) values. It is intended for DC power rail protection where polarity is fixed - unlike SA43CA or SA43A variants which provide bidirectional clamping. Using SA43AH on AC or differential lines would result in forward conduction during negative half-cycles, potentially damaging the device or circuit.
What is the maximum clamping voltage of the SA43AH at its rated peak pulse current?
The SA43AH has a maximum clamping voltage (VC) of 76.7 V at 6.8 A peak pulse current (IPPM), measured under the standard 10/1000μs double-exponential surge waveform. This value is specified in the "Maximum clamping voltage VC@IPPM" row of the SA Series electrical characteristics table for part number SA43, and applies directly to SA43AH as the "H" suffix denotes AEC-Q101 qualification without altering core electrical parameters.
Can the SA43AH be used in 48V mild-hybrid vehicle systems?
Yes, the SA43AH is suitable for 48V mild-hybrid systems due to its 43V working stand-off voltage (VWM), 47.8–58.4V breakdown range, and 76.7V clamping voltage - providing adequate margin above nominal 48V bus while limiting transients to levels compatible with 80V-rated power semiconductors. Its 175°C TJ max and AEC-Q101 qualification further support under-hood deployment in 48V architectures where SA43AH protects DC-DC controllers and battery management interfaces.
What is the reverse leakage current of the SA43AH at its working stand-off voltage?
The SA43AH exhibits reverse leakage current (IR) of less than 1 μA at its 43V working stand-off voltage (VWM), as specified in the SA Series datasheet under "Reverse leakage @ VWM". This ultra-low leakage ensures minimal power loss in always-on automotive subsystems such as telematics modules and gateway ECUs, where SA43AH is used to protect low-quiescent-current power rails without compromising battery drain budgets.
SA43AH 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SA43AH FAQ
1.How can I place an order for SA43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43AH 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 SA43AH reliable?
The price and inventory of SA43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43AH is usually 5 days.
3.What payment methods are accepted for SA43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43AH?
SA43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43AH 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 SA43AH?
For technical support, including SA43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43AH requirements.
6.How does Aetrix verify that SA43AH is sourced from the original manufacturer or authorized distributors?
All SA43AH 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 SA43AH meets industry standards.
7.What is the process for return or replacement of SA43AH?
All SA43AH units undergo pre-shipment inspection (PSI). If there is an issue with SA43AH, 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 SA43AH part is unused and in its original packaging.
Return procedure for SA43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA43AH 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…
