LTM4644 vs. LTM4643 vs. LTM4622: Which ADI Module Can You Replace Today?
LTM4644 vs LTM4643 vs LTM4622: Which ADI Module Can You Replace Today?
If your team uses multiple Linear Technology (ADI) µModule regulators across different products, you might ask: Which models have proven, pin-to-pin alternatives available now? The answer: LTM4644, LTM4643, and LTM4622 all have certified direct replacements from Langma Xinchuang, distributed by Genchipower. This guide helps you compare options and plan your migration.
Overview: Comparison of Three Modules
| Feature | LTM4644 Series | LTM4643 Series | LTM4622 Series |
|---|---|---|---|
| Channels | 4 × 4 A | 3 × 4 A | 2 × 2.5 A (5 A Parallel) |
| Package | BGA77 (9×15 mm) | BGA77 (9×15 mm) | BGA25 (6.25×6.25 mm) |
| Input Voltage | 4 V – 20 V | 4 V – 20 V | 3.6 V – 20 V |
| Output Voltage | 0.6 V – 5.5 V | 0.6 V – 5.5 V | 0.6 V – 5.5 V |
| Operating Frequency | 1 MHz | 1 MHz | 1 MHz |
| Physical Size | 9 × 15 × 2.51 mm | 9 × 15 × 2.51 mm | 6.25 × 6.25 × 2.42 mm |
| Typical Applications | FPGA, ASIC, Servers | Mid-range FPGA, SoC | Compact FPGA/SoC Power Rails |
Alternatives Now Available
Each module has a matching LMX series replacement. The following table lists current availability:
| Original ADI Module | LMX Alternative Model | Core Advantages |
|---|---|---|
| LTM4644 (4 × 4 A) | LMX4644BJL3 / BJCB / TN1 / TBJ / TSH / TSZ | Input voltage up to 20 V, G3 aerospace-grade radiation-hardened options |
| LTM4643 (3 × 4 A) | LMX4643BJL3 | Same BGA77 package, 40–60% cost reduction |
| LTM4622 (2 × 2.5 A) | LMX4622BJL4 / BJCB | Thinner profile (2.42 mm), wider input voltage |
How to Prioritize: Which Module to Switch First?
If you use multiple LTM modules in your product line, we recommend the following priority order:
1️⃣ LTM4622 → LMX4622 (Highest ROI)
Reason: Smallest package (BGA25), significant input voltage advantages, and G3 radiation-hardened options. Verification is easiest due to fewer pins and simple layout.
- Cost Savings: 40–60%
- Switching Time: 1–2 days
- Risk: Very Low
2️⃣ LTM4644 → LMX4644 (Most Significant Volume Impact)
Reason: The most widely used LTM module. A medium-volume PCB typically contains 2–6 LTM4644 units. Switching this model yields the most substantial BOM cost reduction.
- Cost Savings: 40–60%
- Switching Time: 1–2 days
- Risk: Low (Same BGA77 package, 22+ sub-models available)
3️⃣ LTM4643 → LMX4643 (Follow-up)
Reason: While volume may be lower, its BGA77 footprint is identical to LTM4644. Therefore, if you have validated LMX4644, validating LMX4643 is nearly "zero cost" (same package, just fewer channels).
- Cost Savings: 40–60%
- Switching Time: 1–2 days (Reuse LTM4644 validation results)
- Risk: Very Low
Common Advantages of the Three Alternatives
Regardless of which module you switch, every LMX replacement offers:
- ✅ Full Pin-to-pin Compatibility — No PCB changes, no layout redesign needed
- ✅ Wider Input Voltage — Up to 20 V, compared to 14–18 V for LTM
- ✅ Wider Temperature Range — Standard grade supports –55°C to +125°C (up to +160°C available)
- ✅ G3 Radiation-Hardened Level — Suitable for aerospace/defense applications
- ✅ Local Supply Chain — Nationally certified, ISO 9001 / GJB 9001C compliant
- ✅ Free Samples — Genchipower provides test samples for qualified engineers
Practical Switching Strategy: Dual Sourcing
Most hardware teams adopt a dual-sourcing strategy rather than a complete switch all at once:
- Phase 1 (Month 1): Request LMX samples and test on 10 prototype units → Compare ripple, efficiency, and thermal performance
- Phase 2 (Month 2): Validate in Class A products (e.g., mid-range models) → Conduct small batch production of 100 units
- Phase 3 (Month 3): Add LMX as an approved second source → Allocate BOM ratio: 60% LMX / 40% LTM
- Phase 4 (Month 4+): Increase LMX ratio to 80%+ in cost-optimized production models
How to Start?
Genchipower provides full evaluation support for all three LMX series. Here is the process:
- Identify the LTM module you want to replace
- Contact Genchipower ([email protected]) with specific models and annual volume
- Request Free Samples — Usually ships within 2–3 business days
- Test on your production PCB — Same footprint, no revisions needed
- Compare Data — Full test reports provided with samples
FAQ — LTM Module Replacement Guide
Q1: Can one LMX4644 replace all LTM4644 variants?
Yes. The LMX4644 family includes over 7 variants covering plastic, ceramic, industrial, and wide-temperature grades—all of which are pin-compatible with LTM4644. Contact Genchipower to confirm the best match for your specific LTM4644 model.
Q2: Is the LMX4643 smaller than the LTM4643?
No, they use the same BGA77 (9×15 mm) package. LMX4643 is a pin-compatible replacement—size, pads, and pin definitions are identical.
Q3: Can I use LMX4622 for both 2.5 A and 5 A outputs?
Yes. Each channel provides 2.5 A. In parallel mode (two channels connected), the output reaches 5 A—consistent with LTM4622 functionality.
Q4: Do all LMX series support G3 radiation-hardened levels?
G3 levels are currently available for LMX4644BJL3 and LMX4622BJL4. For LMX4643, G3 levels can be customized for high-volume orders. Standard levels for all models cover –55°C to +125°C.
Q5: Is the quality certification consistent across all LMX series?
Yes. All LMX46xx products are manufactured under ISO 9001 and GJB 9001C quality systems, featuring a 100% localized supply chain and national-level core technology certification.
Q6: What is the Minimum Order Quantity (MOQ)?
Samples: Free (typically 5–10 units). Mass Production: Starts from 1 unit for in-stock items. Distributor pricing available for 100+ units.
Q7: Are the shipping and logistics policies the same for all products?
Yes. Genchipower ships globally from Shenzhen, China. Typical lead time: 2–3 days via express to most countries, 5–7 days for standard logistics. All shipments include batch traceability records and test reports.
Related Products: LMX4644 | LMX4643 | LMX4622
Contact: [email protected] | +86 193 3087 7954
Official Website: genchipower.com | yxchip.com
