My Inquiry
My Account
Taiwan Semiconductor Corporation SA12AH
- Part No.:
- SA12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,195
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA12AH 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 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR @ 1mA), and 22.0V clamping voltage (VC) at 23A peak pulse current - designed for automotive-level ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SA12AH datasheet, SA12AH pinout, SA12AH application, or SA12AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, thermal derating behavior, and direct alternatives with documented VWM/VBR/VC alignment for automotive and industrial overvoltage protection design.
Technical Context
The SA12AH operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified breakdown range (13.3–16.3V at 1mA test current), limiting transient energy via low-impedance clamping to ≤22.0V at 23A. Its fast response time (<1.0ps from 0V to VBR) ensures protection of downstream ICs against ESD and fast transients.
Rated for continuous operation from –55°C to +175°C junction temperature, it supports high-reliability automotive applications with RoHS-compliant, halogen-free molding compound, pure tin-plated leads, and JESD201 Class 2 whisker resistance - all validated per AEC-Q101 stress test requirements including HTGB, HTRB, and TCT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line |
| VBR min/max | 13.3 / 16.3 V @ 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots |
| VC @ IPPM | 22.0 V @ 23 A - clamped voltage during 10/1000μs surge; determines maximum stress on downstream components |
| PPK | 500 W - peak pulse power handling at TA = 25°C; derates linearly above 25°C per Fig.2 |
| TJ max | +175 °C - maximum junction temperature; enables under-hood deployment without thermal shutdown |
| IR @ VWM | <1 μA - reverse leakage at 12 V; minimizes standby power loss in battery-critical systems |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with 0.400 g mass; compatible with legacy through-hole assembly |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity; terminals are pure tin-plated, solderable per J-STD-002; meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V supply); conducts during overvoltage events to clamp to VC |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use with HTGB, HTRB, TCT, and mechanical stress testing - required for under-hood and powertrain modules |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump simulation) without degradation |
| <1.0 ps response time | Enables sub-nanosecond clamping onset - critical for protecting high-speed CAN, LIN, and sensor interfaces from ESD |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directives; supports green manufacturing and end-of-life recycling |
| Low IR & tight VBR tolerance | Leakage <1 μA at 12 V and ±12% VBR spread ensure stable biasing and predictable turn-on in safety-critical circuits |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and LDO/regulator input to clamp surges before they reach sensitive PMICs. Use Value: Clamps to 22.0V at 23A, limiting stress on downstream 36V-rated regulators while maintaining AEC-Q101 compliance. | Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed across noisy engine bays. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD (IEC 61000-4-2 ±8kV contact) and EFT (IEC 61000-4-4 ±2kV) transients. Use Value: Sub-1ps response ensures clamping occurs before transient propagates into op-amp input stages, preserving signal integrity. |
| LED Lighting Driver Protection | Industrial PLC Digital Input Protection |
Use Scenario: Constant-current LED drivers subjected to inductive switching spikes from relay coils or solenoids. IC Role / Device Role / Timing Role: SA12AH placed across driver output to absorb flyback energy and prevent MOSFET gate oxide damage. Use Value: 500W surge rating handles repetitive 10/1000μs transients up to 4 pulses/minute without parameter shift or thermal runaway. | Use Scenario: 24V digital inputs on PLC modules exposed to field wiring transients (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: TVS used in series with current-limiting resistor to protect optocoupler input stage from sustained overvoltage. Use Value: 12V VWM provides sufficient margin above 24V nominal while enabling reliable clamping at 22V before optocoupler breakdown. |
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 SMAJ12A | Same DO-204AC package, 12V VWM, 13.3–14.7V VBR, 19.9V VC @ 26.3A - tighter VBR tolerance but lower PPK (400W) | Lower clamping voltage suits ultra-low-voltage logic protection; insufficient for full ISO 7637-2 Pulse 5a compliance | Select SMAJ12A only if system-level surge testing confirms 400W sufficiency and lower VC is prioritized over automotive qualification |
| ON Semiconductor 1.5KE12A | DO-201AD package, 12V VWM, 13.3–14.7V VBR, 19.9V VC @ 26.3A - same electrical specs but higher PPK (1500W), non-AEC-Q101 | Higher surge margin supports harsher industrial environments; lacks automotive qualification documentation and thermal cycling validation | Choose 1.5KE12A for non-automotive industrial designs requiring higher single-pulse robustness without AEC-Q101 traceability |
Compared with SMAJ12A and 1.5KE12A, the SA12AH uniquely combines AEC-Q101 qualification, 500W capability, and DO-15 compatibility - making it the only option among the three qualified for automotive power rail protection where both regulatory compliance and standardized packaging are mandatory.
Availability
SA12AH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting drivers, and PLC digital input protection requiring stable component supply with full AEC-Q101 traceability and DO-204AC (DO-15) form factor compatibility.
Supply support for SA12AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, Zener diodes, and MOSFETs for automotive, industrial, and consumer markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems - emphasizing low clamping voltage, fast response, and long-term reliability under thermal cycling and humidity stress.
FAQ
What is the AEC-Q101 qualification status of the SA12AH?
The SA12AH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H" and datasheet Version L2105. It has undergone full stress testing including high-temperature reverse bias (HTGB), high-temperature operating life (HTOL), temperature cycling (TCT), and mechanical shock - with test reports available upon request for automotive program validation.
Does the SA12AH have bidirectional capability?
No, the SA12AH is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and confirmed by its single cathode band marking and specification table listing only unidirectional parameters (e.g., VF = 3.5V at 35A). For bidirectional protection, SA12A or SA12CA would be required instead.
What is the maximum clamping voltage of the SA12AH under standard surge conditions?
The SA12AH has a maximum clamping voltage (VC) of 22.0 V at 23 A peak pulse current, tested per the 10/1000μs waveform defined in ANSI/IEEE C62.35. This value is guaranteed across the full operating temperature range and forms the basis for downstream component voltage margining in circuit design.
Can the SA12AH be used in surface-mount designs?
No, the SA12AH is packaged exclusively in DO-204AC (DO-15), a through-hole axial-leaded format. It is not available in SMD packages such as SMA, SMB, or SMC. For surface-mount equivalents, consider TSC's SMAJ12AH or SMA6J12AH - both AEC-Q101 qualified and pin-compatible in SMA package.
How does the SA12AH's thermal derating behave above 25°C ambient?
The SA12AH's peak pulse power (PPK) derates linearly above TA = 25°C per Figure 2 in the datasheet: at 75°C ambient, PPK drops to approximately 350W; at 125°C, it falls to ~175W. This must be accounted for in under-hood applications where board temperature exceeds 75°C during sustained operation.
SA12AH 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 26.3A
- 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)
SA12AH FAQ
1.How can I place an order for SA12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA12AH 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 SA12AH reliable?
The price and inventory of SA12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA12AH is usually 5 days.
3.What payment methods are accepted for SA12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA12AH?
SA12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA12AH 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 SA12AH?
For technical support, including SA12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA12AH requirements.
6.How does Aetrix verify that SA12AH is sourced from the original manufacturer or authorized distributors?
All SA12AH 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 SA12AH meets industry standards.
7.What is the process for return or replacement of SA12AH?
All SA12AH units undergo pre-shipment inspection (PSI). If there is an issue with SA12AH, 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 SA12AH part is unused and in its original packaging.
Return procedure for SA12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA12AH 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…
