My Inquiry
My Account
Diodes Incorporated ALS5W16A
- Part No.:
- ALS5W16A
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
ALS5W16A.pdf
- Description:
- Transient Voltage Suppressor PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,307
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ALS5W16A from Diodes Incorporated is a unidirectional surface-mount load dump transient voltage suppressor in DO-218 package, rated for 16 V stand-off voltage (VWM), 17.8–19.7 V breakdown (VBR), 3600 W peak pulse power (10/1000 µs), and 138 A peak pulse current, designed specifically for automotive ECU load dump protection.
For engineers reviewing the ALS5W16A datasheet, ALS5W16A pinout, ALS5W16A application, or ALS5W16A equivalent, key selection criteria include clamping voltage (26.0 V at IPPM), thermal resistance performance up to +175 °C junction temperature, unidirectional polarity with heatsink-anode configuration, and AEC-Q101 qualification for under-hood automotive environments.
Technical Context
This TVS diode operates as a clamping device during ISO 7637-2 and ISO 16750-2 load dump transients, responding to exponential 10 ms surges with 2800 W capability and sustaining 500 A forward surge (8.3 ms half-sine). Its low thermal resistance enables stable operation at case temperatures up to 175 °C.
The DO-218 package integrates a heatsink-anode terminal structure optimized for high-power dissipation in compact automotive PCB layouts. Polarity is fixed: cathode marked by bar; anode is the metal heatsink tab - critical for correct mounting and thermal path design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 16.0 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below system nominal 12 V/24 V rails. |
| VBR (Breakdown Voltage) | 17.8–19.7 V @ 5 mA - Confirmed avalanche onset range; ensures reliable triggering before downstream IC damage. |
| VC (Clamping Voltage) | 26.0 V @ 138 A (10/1000 µs) - Actual voltage seen by protected circuit during worst-case surge; defines safe clamp ceiling. |
| PPPM (Peak Pulse Power) | 3600 W (10/1000 µs) - Sustained transient energy handling per ISO 7637-2 Pulse 5a; validates robustness against fast load dump events. |
| IFSM (Surge Current) | 500 A (8.3 ms half-sine) - Forward surge rating confirms survivability during inrush or short-circuit recovery scenarios. |
| TJ Range | −55 to +175 °C - Full automotive-grade junction temperature range; supports engine bay placement without derating. |
| Leakage ID | ≤10 µA @ 16 V, 25 °C - Low reverse leakage preserves battery drain budget in always-on vehicle modules. |
Pinout & Package
DO-218 plastic package with integrated heatsink anode; polarity marked by cathode bar on molded body. Anode is electrically connected to the exposed metal tab (heatsink), cathode to the leaded terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Positive DC reference / Thermal path | Must be soldered to large copper pour or heatsink; serves as primary thermal conduction path and circuit return node. |
| Cathode (Lead) | Transient current sink | Connected to protected line (e.g., battery rail); conducts surge current to anode/heatsink during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per stress test requirements. |
| ISO 7637-2 & ISO 16750-2 compliant | Meets Pulse 5a (load dump) and Pulse 5b (superimposed ripple) test profiles without failure or parameter shift. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles; no moisture sensitivity concerns pre-assembly. |
| Halogen- and antimony-free "Green" | Br & Cl < 900 ppm each, Br+Cl < 1500 ppm, Sb < 1000 ppm - satisfies EU environmental compliance and OEM sustainability mandates. |
| Low VF (≤2.0 V @ 100 A) | Minimizes conduction loss during high-current forward events such as motor stall or short-circuit recovery. |
Applications
| Engine Control Unit Protection | Body Control Module Input Protection |
|---|---|
Use Scenario: Protects microcontroller power inputs in gasoline/diesel ECUs subjected to alternator load dump surges up to 120 V. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and LDO input, triggered within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤26.0 V during 3600 W transients, preventing latch-up or gate oxide damage in 5 V/3.3 V regulators and MCU I/O. | Use Scenario: Shields LIN bus transceivers and power switches in BCMs from battery line transients during door lock actuation or lighting load switching. IC Role / Device Role / Timing Role: Primary front-end protection element on 12 V supply rail, positioned upstream of DC-DC converters and CAN/LIN interface ICs. Use Value: Maintains system uptime by absorbing >2800 W (10/10,000 µs) surges without degradation, enabling compliance with OEM EMC validation plans. |
| LED Headlamp Driver Protection | Start-Stop System Battery Interface |
Use Scenario: Safeguards constant-current LED driver ICs in adaptive front lighting systems exposed to repeated load dump events during engine restart. IC Role / Device Role / Timing Role: High-energy clamping device mounted directly at connector entry point, thermally coupled to chassis ground plane. Use Value: Enables 175 °C continuous operation and survives >1000 surge cycles per ISO 16750-2 Annex C, extending headlamp module lifetime. | Use Scenario: Protects bidirectional DC-DC converter control logic in start-stop systems where battery voltage fluctuates rapidly during cranking and alternator engagement. IC Role / Device Role / Timing Role: Bidirectional surge suppression not applicable - this unidirectional device guards only positive transients on the main battery feed. Use Value: Prevents false resets in supervisory circuits by clamping 16 V nominal rail to 26 V max during 10 ms exponential load dump waveforms per ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Lower PPPM (400 W), SMA package, 27.7 V clamping at 12.9 A | Not suitable for ISO 7637-2 Pulse 5a; limited to low-energy transients in non-automotive or auxiliary circuits | Select only for cost-sensitive, non-automotive 12 V systems with <500 W surge exposure. |
| SMCJ16A | Higher PPPM (1500 W), SMC package, 25.6 V clamping at 58.8 A | Fails ISO 7637-2 Pulse 5a marginally; insufficient for full automotive load dump compliance | Acceptable for mid-tier automotive modules (e.g., infotainment power rails) where full ECU-level robustness is not required. |
Compared with SMAJ16A and SMCJ16A, ALS5W16A delivers 2.4× and 2.4× higher peak pulse power respectively, with verified 3600 W capability and AEC-Q101 qualification - making it the only option among the three validated for primary ECU load dump protection in modern 12 V automotive platforms.
Availability
ALS5W16A is available at Aetrix Electronics and suitable for automotive ECU protection, LED headlamp driver safeguarding, and start-stop system battery interface stabilization requiring stable component supply across production lifecycles.
Supply support for ALS5W16A 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
Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices for automotive, industrial, computing, and consumer markets.
The ALS5WxxA series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically to meet stringent ISO 7637-2 and ISO 16750-2 load dump requirements in engine control, body electronics, and lighting systems.
FAQ
What is the maximum clamping voltage of ALS5W16A under standard test conditions?
The maximum clamping voltage (VC) is 26.0 V when subjected to a 138 A peak pulse current with a 10/1000 µs waveform at TA = 25 °C. This value is measured per JEDEC standards and confirmed across production lots; it defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Is ALS5W16A suitable for bidirectional transient suppression?
No - ALS5W16A is a unidirectional TVS diode with anode-heatsink polarity. It suppresses only positive-going transients on the cathode-connected line. For bidirectional protection (e.g., data lines), a separate symmetric TVS or dual-diode configuration is required; this part must be used with correct orientation relative to system ground.
How does the DO-218 package improve thermal performance compared to SMA or SMC packages?
The DO-218's integral metal heatsink tab provides direct thermal conduction from the silicon die to the PCB copper pour or external heatsink, achieving significantly lower RθJA than SMA/SMC. Measured thermal impedance allows sustained 3600 W pulses at case temperatures up to 125 °C without exceeding 175 °C junction limit - a key advantage for space-constrained under-hood layouts.
Does ALS5W16A require derating at elevated ambient temperatures?
Yes - power derating is mandatory above 25 °C ambient. The datasheet specifies linear derating from 3600 W at 25 °C to zero at 175 °C case temperature. At 100 °C case, maximum PPPM drops to ~2200 W (10/1000 µs); designers must consult Figure 1 (Power Derating Curve) and apply appropriate safety margins for target operating conditions.
ALS5W16A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-218AB
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 138A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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:
- DO-218
ALS5W16A FAQ
1.How can I place an order for ALS5W16A through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS5W16A 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 ALS5W16A reliable?
The price and inventory of ALS5W16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS5W16A is usually 5 days.
3.What payment methods are accepted for ALS5W16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS5W16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS5W16A?
ALS5W16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS5W16A 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 ALS5W16A?
For technical support, including ALS5W16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS5W16A requirements.
6.How does Aetrix verify that ALS5W16A is sourced from the original manufacturer or authorized distributors?
All ALS5W16A 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 ALS5W16A meets industry standards.
7.What is the process for return or replacement of ALS5W16A?
All ALS5W16A units undergo pre-shipment inspection (PSI). If there is an issue with ALS5W16A, 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 ALS5W16A part is unused and in its original packaging.
Return procedure for ALS5W16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALS5W16A 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
