My Inquiry
My Account
Taiwan Semiconductor Corporation SA45AH
- Part No.:
- SA45AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45AH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,240
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA45AH 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, 45V working stand-off voltage (VWM), and clamps to ≤80.3V at 6.5A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 45V), and operates from –55°C to +175°C - deployed in automotive power line and ECU front-end protection.
For engineers reviewing the SA45AH datasheet, SA45AH pinout, SA45AH application, or SA45AH equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, clamping behavior under 10/1000μs surge, thermal derating guidance, and direct alternatives with documented VWM/VC/IPPM trade-offs.
Technical Context
The SA45AH is a silicon avalanche diode designed for unidirectional transient suppression, leveraging controlled breakdown at 50.0–61.1V (VBR @ 1mA) to clamp overvoltage events before downstream circuitry sustains damage. Its low dynamic impedance ensures stable clamping during 500W surges, while the 1.0ps response time enables protection against sub-nanosecond ESD and EFT transients.
It complies with AEC-Q101 stress test requirements including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. The device exhibits a positive VBR temperature coefficient of +58 mV/°C, requiring derating above 25°C per Fig.2 - critical for under-hood automotive applications where junction temperatures exceed 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse voltage before significant leakage; sets minimum system operating margin for 12V/24V automotive rails. |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - guaranteed breakdown range defines clamping onset threshold; used to verify margin vs. IC absolute maximum ratings. |
| VC @ IPPM | ≤80.3 V @ 6.5 A - peak clamped voltage during 10/1000μs surge; determines worst-case stress on protected IC inputs. |
| PPK | 500 W - peak pulse power handling per single 10/1000μs waveform; validates compliance with ISO 7637-2 Pulse 1/2a/5a immunity tests. |
| IR @ VWM | <1 μA - reverse leakage at 45V; ensures negligible standby current draw in always-on vehicle modules. |
| TJ max | +175 °C - maximum junction temperature; supports placement near high-power components without thermal shutdown risk. |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Weight: ~0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to ground or low-impedance return; carries full surge current during clamping event. |
| Cathode | Transient voltage reference node | Connected to protected line (e.g., battery rail); voltage at this terminal rises to VC during surge, limiting stress on downstream load. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements - eliminates need for customer requalification in Tier 1 designs. |
| 500W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 500W without degradation - enables single-device protection for 12V systems. |
| Clamping voltage ≤80.3V | Ensures protected ICs with 85V abs max rating remain within safe operating area during worst-case surge. |
| Response time <1.0ps | Activates before ESD transients propagate across PCB traces - critical for protecting high-speed CAN/LIN transceivers. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives - supports global automotive OEM material declarations. |
Applications
| Automotive Power Line Protection | ECU Input Stage Protection |
|---|---|
Use Scenario: Installed across battery feed to engine control unit (ECU) to suppress load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamps 12V rail to ≤80.3V during 500W surge, shielding MCU, CAN transceiver, and analog sensors. Use Value: Prevents latch-up or gate oxide rupture in 3.3V/5V logic powered from local LDOs fed by protected 12V input. | Use Scenario: Placed at LIN bus input of body control module to absorb EFT bursts (IEC 61000-4-4) and ESD (IEC 61000-4-2). IC Role / Device Role / Timing Role: Fast-response TVS diverts nanosecond-scale transients away from LIN transceiver's RX/TX pins before internal protection triggers. Use Value: Maintains bus communication integrity during door actuator switching noise without requiring external RC filters or layout changes. |
| DC Motor Driver Protection | LED Headlamp Power Stage |
Use Scenario: Mounted across H-bridge high-side MOSFET drain-source to suppress inductive kickback during PWM commutation. IC Role / Device Role / Timing Role: Absorbs energy from motor coil flyback, limiting VDS spikes to ≤80.3V and preventing MOSFET avalanche failure. Use Value: Enables use of lower RDS(on) MOSFETs without overvoltage derating - improves efficiency and thermal margin in compact motor drivers. | Use Scenario: Connected between LED string anode and 45V constant-current driver output to protect against supply overvoltage and hot-swap transients. IC Role / Device Role / Timing Role: Clamps driver output to safe level during cold-crank dips or alternator regulation faults, preserving LED driver IC and optical stack. Use Value: Eliminates need for redundant OVP circuitry - reduces BOM count and PCB area in space-constrained headlamp modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | VWM = 45V, VC = 72.7V @ 7.2A, PPK = 400W, DO-214AC package | Lower clamping voltage but 100W less surge rating; surface-mount only | Select SMAJ45A when board space is constrained and 400W suffices for ISO 16750-2 load dump simulation. |
| P6SMB45A | VWM = 45V, VC = 72.7V @ 7.2A, PPK = 600W, DO-214AA package | Higher surge rating and same clamping, but larger footprint and no AEC-Q101 qualification | Choose P6SMB45A for industrial power supplies where AEC-Q101 is not required and 600W margin is needed. |
Compared with SA45AH, SMAJ45A offers tighter clamping but sacrifices 100W surge capacity and automotive qualification; P6SMB45A provides higher power headroom but lacks AEC-Q101 validation and uses a larger package - making SA45AH the optimal choice for cost-sensitive, space-tolerant automotive front-end protection where 500W and qualification are mandatory.
Availability
SA45AH is available at Aetrix Electronics and suitable for automotive ECU design, 12V/24V power distribution units, and LED lighting control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA45AH 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 is engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, high-temperature operation, and precise clamping performance across 5V–170V VWM range.
FAQ
What does the "H" suffix in SA45AH signify?
The "H" suffix in SA45AH indicates full AEC-Q101 qualification - verified through temperature cycling, high-temperature operating life, and unbiased HAST testing. This distinguishes SA45AH from standard SA45A, which lacks automotive qualification. SA45AH is intended for under-hood and safety-critical applications where reliability under thermal and mechanical stress is mandatory.
What is the maximum clamping voltage of SA45AH under a 10/1000μs surge?
The maximum clamping voltage (VC) of SA45AH is 80.3 V at 6.5 A peak pulse current (IPPM), measured per 10/1000μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during standardized surge events such as ISO 7637-2 Pulse 5a.
Can SA45AH be used in bidirectional configurations?
No, SA45AH is a unidirectional TVS diode and must be installed with correct polarity - cathode toward the protected line. Bidirectional protection requires SA45AH's counterpart SA45AHA or other explicitly bipolar variants (e.g., SA45CA). Using SA45AH in reverse-biased configuration will not provide symmetrical clamping and may fail catastrophically under positive transients.
How does SA45AH's temperature coefficient affect its performance at 125°C?
SA45AH has a VBR temperature coefficient of +58 mV/°C. At 125°C (ΔT = +100°C), VBR increases by ~5.8 V - shifting from 50.0–61.1 V at 25°C to approximately 55.8–66.9 V. This upward drift must be accounted for in margin analysis to ensure clamping remains below protected IC absolute maximum ratings at elevated ambient temperatures.
Is SA45AH compatible with lead-free reflow soldering processes?
Yes, SA45AH features pure tin-plated leads compliant with J-STD-002 and rated for standard lead-free reflow profiles (peak temperature ≤260°C, 60–90 sec above 217°C). The DO-204AC molding compound meets UL 94V-0 flammability rating, and the device passes JEDEC JESD22-A113 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life before assembly.
SA45AH 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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)
SA45AH FAQ
1.How can I place an order for SA45AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45AH 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 SA45AH reliable?
The price and inventory of SA45AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45AH is usually 5 days.
3.What payment methods are accepted for SA45AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45AH?
SA45AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45AH 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 SA45AH?
For technical support, including SA45AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45AH requirements.
6.How does Aetrix verify that SA45AH is sourced from the original manufacturer or authorized distributors?
All SA45AH 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 SA45AH meets industry standards.
7.What is the process for return or replacement of SA45AH?
All SA45AH units undergo pre-shipment inspection (PSI). If there is an issue with SA45AH, 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 SA45AH part is unused and in its original packaging.
Return procedure for SA45AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45AH 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…
